27 files changed, 1472 insertions, 655 deletions

diff --git a/Doc/c-api/exceptions.rst b/Doc/c-api/exceptions.rst
index dd1e026..6dd0c02 100644
--- a/Doc/c-api/exceptions.rst
+++ b/Doc/c-api/exceptions.rst
@@ -800,6 +800,7 @@ the variables:
    single: PyExc_SystemError
    single: PyExc_SystemExit
    single: PyExc_TabError
+   single: PyExc_TargetScopeError
    single: PyExc_TimeoutError
    single: PyExc_TypeError
    single: PyExc_UnboundLocalError
@@ -901,6 +902,8 @@ the variables:
 +-----------------------------------------+---------------------------------+----------+
 | :c:data:`PyExc_TabError`                | :exc:`TabError`                 |          |
 +-----------------------------------------+---------------------------------+----------+
+| :c:data:`PyExc_TargetScopeError`        | :exc:`TargetScopeError`         |          |
++-----------------------------------------+---------------------------------+----------+
 | :c:data:`PyExc_TimeoutError`            | :exc:`TimeoutError`             |          |
 +-----------------------------------------+---------------------------------+----------+
 | :c:data:`PyExc_TypeError`               | :exc:`TypeError`                |          |
diff --git a/Doc/library/token-list.inc b/Doc/library/token-list.inc
index cd6e0f2..3ea9439 100644
--- a/Doc/library/token-list.inc
+++ b/Doc/library/token-list.inc
@@ -197,6 +197,10 @@
 
    Token value for ``"..."``.
 
+.. data:: COLONEQUAL
+
+   Token value for ``":="``.
+
 .. data:: OP
 
 .. data:: ERRORTOKEN
diff --git a/Grammar/Grammar b/Grammar/Grammar
index e232df9..f21fa11 100644
--- a/Grammar/Grammar
+++ b/Grammar/Grammar
@@ -69,7 +69,7 @@ assert_stmt: 'assert' test [',' test]
 
 compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | with_stmt | funcdef | classdef | decorated | async_stmt
 async_stmt: 'async' (funcdef | with_stmt | for_stmt)
-if_stmt: 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite]
+if_stmt: 'if' namedexpr_test ':' suite ('elif' namedexpr_test ':' suite)* ['else' ':' suite]
 while_stmt: 'while' test ':' suite ['else' ':' suite]
 for_stmt: 'for' exprlist 'in' testlist ':' suite ['else' ':' suite]
 try_stmt: ('try' ':' suite
@@ -83,6 +83,7 @@ with_item: test ['as' expr]
 except_clause: 'except' [test ['as' NAME]]
 suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT
 
+namedexpr_test: test [':=' test]
 test: or_test ['if' or_test 'else' test] | lambdef
 test_nocond: or_test | lambdef_nocond
 lambdef: 'lambda' [varargslist] ':' test
@@ -108,7 +109,7 @@ atom: ('(' [yield_expr|testlist_comp] ')' |
        '[' [testlist_comp] ']' |
        '{' [dictorsetmaker] '}' |
        NAME | NUMBER | STRING+ | '...' | 'None' | 'True' | 'False')
-testlist_comp: (test|star_expr) ( comp_for | (',' (test|star_expr))* [','] )
+testlist_comp: (namedexpr_test|star_expr) ( comp_for | (',' (namedexpr_test|star_expr))* [','] )
 trailer: '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME
 subscriptlist: subscript (',' subscript)* [',']
 subscript: test | [test] ':' [test] [sliceop]
@@ -134,6 +135,7 @@ arglist: argument (',' argument)*  [',']
 # multiple (test comp_for) arguments are blocked; keyword unpackings
 # that precede iterable unpackings are blocked; etc.
 argument: ( test [comp_for] |
+            test ':=' test |
             test '=' test |
             '**' test |
             '*' test )
diff --git a/Grammar/Tokens b/Grammar/Tokens
index 9595673..f6f303b 100644
--- a/Grammar/Tokens
+++ b/Grammar/Tokens
@@ -52,6 +52,7 @@ AT                      '@'
 ATEQUAL                 '@='
 RARROW                  '->'
 ELLIPSIS                '...'
+COLONEQUAL              ':='
 
 OP
 ERRORTOKEN
diff --git a/Include/Python-ast.h b/Include/Python-ast.h
index f8394e6..3527ae8 100644
--- a/Include/Python-ast.h
+++ b/Include/Python-ast.h
@@ -17,7 +17,7 @@ typedef struct _stmt *stmt_ty;
 typedef struct _expr *expr_ty;
 
 typedef enum _expr_context { Load=1, Store=2, Del=3, AugLoad=4, AugStore=5,
-                             Param=6 } expr_context_ty;
+                             Param=6, NamedStore=7 } expr_context_ty;
 
 typedef struct _slice *slice_ty;
 
@@ -214,14 +214,14 @@ struct _stmt {
     int end_col_offset;
 };
 
-enum _expr_kind {BoolOp_kind=1, BinOp_kind=2, UnaryOp_kind=3, Lambda_kind=4,
-                  IfExp_kind=5, Dict_kind=6, Set_kind=7, ListComp_kind=8,
-                  SetComp_kind=9, DictComp_kind=10, GeneratorExp_kind=11,
-                  Await_kind=12, Yield_kind=13, YieldFrom_kind=14,
-                  Compare_kind=15, Call_kind=16, FormattedValue_kind=17,
-                  JoinedStr_kind=18, Constant_kind=19, Attribute_kind=20,
-                  Subscript_kind=21, Starred_kind=22, Name_kind=23,
-                  List_kind=24, Tuple_kind=25};
+enum _expr_kind {BoolOp_kind=1, NamedExpr_kind=2, BinOp_kind=3, UnaryOp_kind=4,
+                  Lambda_kind=5, IfExp_kind=6, Dict_kind=7, Set_kind=8,
+                  ListComp_kind=9, SetComp_kind=10, DictComp_kind=11,
+                  GeneratorExp_kind=12, Await_kind=13, Yield_kind=14,
+                  YieldFrom_kind=15, Compare_kind=16, Call_kind=17,
+                  FormattedValue_kind=18, JoinedStr_kind=19, Constant_kind=20,
+                  Attribute_kind=21, Subscript_kind=22, Starred_kind=23,
+                  Name_kind=24, List_kind=25, Tuple_kind=26};
 struct _expr {
     enum _expr_kind kind;
     union {
@@ -231,6 +231,11 @@ struct _expr {
         } BoolOp;
 
         struct {
+            expr_ty target;
+            expr_ty value;
+        } NamedExpr;
+
+        struct {
             expr_ty left;
             operator_ty op;
             expr_ty right;
@@ -541,6 +546,10 @@ stmt_ty _Py_Continue(int lineno, int col_offset, int end_lineno, int
 #define BoolOp(a0, a1, a2, a3, a4, a5, a6) _Py_BoolOp(a0, a1, a2, a3, a4, a5, a6)
 expr_ty _Py_BoolOp(boolop_ty op, asdl_seq * values, int lineno, int col_offset,
                    int end_lineno, int end_col_offset, PyArena *arena);
+#define NamedExpr(a0, a1, a2, a3, a4, a5, a6) _Py_NamedExpr(a0, a1, a2, a3, a4, a5, a6)
+expr_ty _Py_NamedExpr(expr_ty target, expr_ty value, int lineno, int
+                      col_offset, int end_lineno, int end_col_offset, PyArena
+                      *arena);
 #define BinOp(a0, a1, a2, a3, a4, a5, a6, a7) _Py_BinOp(a0, a1, a2, a3, a4, a5, a6, a7)
 expr_ty _Py_BinOp(expr_ty left, operator_ty op, expr_ty right, int lineno, int
                   col_offset, int end_lineno, int end_col_offset, PyArena
diff --git a/Include/graminit.h b/Include/graminit.h
index bdfe821..e3acff8 100644
--- a/Include/graminit.h
+++ b/Include/graminit.h
@@ -49,41 +49,42 @@
 #define with_item 302
 #define except_clause 303
 #define suite 304
-#define test 305
-#define test_nocond 306
-#define lambdef 307
-#define lambdef_nocond 308
-#define or_test 309
-#define and_test 310
-#define not_test 311
-#define comparison 312
-#define comp_op 313
-#define star_expr 314
-#define expr 315
-#define xor_expr 316
-#define and_expr 317
-#define shift_expr 318
-#define arith_expr 319
-#define term 320
-#define factor 321
-#define power 322
-#define atom_expr 323
-#define atom 324
-#define testlist_comp 325
-#define trailer 326
-#define subscriptlist 327
-#define subscript 328
-#define sliceop 329
-#define exprlist 330
-#define testlist 331
-#define dictorsetmaker 332
-#define classdef 333
-#define arglist 334
-#define argument 335
-#define comp_iter 336
-#define sync_comp_for 337
-#define comp_for 338
-#define comp_if 339
-#define encoding_decl 340
-#define yield_expr 341
-#define yield_arg 342
+#define namedexpr_test 305
+#define test 306
+#define test_nocond 307
+#define lambdef 308
+#define lambdef_nocond 309
+#define or_test 310
+#define and_test 311
+#define not_test 312
+#define comparison 313
+#define comp_op 314
+#define star_expr 315
+#define expr 316
+#define xor_expr 317
+#define and_expr 318
+#define shift_expr 319
+#define arith_expr 320
+#define term 321
+#define factor 322
+#define power 323
+#define atom_expr 324
+#define atom 325
+#define testlist_comp 326
+#define trailer 327
+#define subscriptlist 328
+#define subscript 329
+#define sliceop 330
+#define exprlist 331
+#define testlist 332
+#define dictorsetmaker 333
+#define classdef 334
+#define arglist 335
+#define argument 336
+#define comp_iter 337
+#define sync_comp_for 338
+#define comp_for 339
+#define comp_if 340
+#define encoding_decl 341
+#define yield_expr 342
+#define yield_arg 343
diff --git a/Include/pyerrors.h b/Include/pyerrors.h
index efe1c49..5c67518 100644
--- a/Include/pyerrors.h
+++ b/Include/pyerrors.h
@@ -108,6 +108,7 @@ PyAPI_DATA(PyObject *) PyExc_NotImplementedError;
 PyAPI_DATA(PyObject *) PyExc_SyntaxError;
 PyAPI_DATA(PyObject *) PyExc_IndentationError;
 PyAPI_DATA(PyObject *) PyExc_TabError;
+PyAPI_DATA(PyObject *) PyExc_TargetScopeError;
 PyAPI_DATA(PyObject *) PyExc_ReferenceError;
 PyAPI_DATA(PyObject *) PyExc_SystemError;
 PyAPI_DATA(PyObject *) PyExc_SystemExit;
diff --git a/Include/symtable.h b/Include/symtable.h
index 949022b..9392e64 100644
--- a/Include/symtable.h
+++ b/Include/symtable.h
@@ -50,6 +50,7 @@ typedef struct _symtable_entry {
                                      including free refs to globals */
     unsigned ste_generator : 1;   /* true if namespace is a generator */
     unsigned ste_coroutine : 1;   /* true if namespace is a coroutine */
+    unsigned ste_comprehension : 1; /* true if namespace is a list comprehension */
     unsigned ste_varargs : 1;     /* true if block has varargs */
     unsigned ste_varkeywords : 1; /* true if block has varkeywords */
     unsigned ste_returns_value : 1;  /* true if namespace uses return with
diff --git a/Include/token.h b/Include/token.h
index 2d491e6..b87b84c 100644
--- a/Include/token.h
+++ b/Include/token.h
@@ -63,9 +63,10 @@ extern "C" {
 #define ATEQUAL         50
 #define RARROW          51
 #define ELLIPSIS        52
-#define OP              53
-#define ERRORTOKEN      54
-#define N_TOKENS        58
+#define COLONEQUAL      53
+#define OP              54
+#define ERRORTOKEN      55
+#define N_TOKENS        59
 #define NT_OFFSET       256
 
 /* Special definitions for cooperation with parser */
diff --git a/Lib/_compat_pickle.py b/Lib/_compat_pickle.py
index f68496a..8bb1cf8 100644
--- a/Lib/_compat_pickle.py
+++ b/Lib/_compat_pickle.py
@@ -128,6 +128,7 @@ PYTHON2_EXCEPTIONS = (
     "SystemError",
     "SystemExit",
     "TabError",
+    "TargetScopeError",
     "TypeError",
     "UnboundLocalError",
     "UnicodeDecodeError",
diff --git a/Lib/symbol.py b/Lib/symbol.py
index 40d0ed1..b3fa089 100644
--- a/Lib/symbol.py
+++ b/Lib/symbol.py
@@ -61,44 +61,45 @@ with_stmt = 301
 with_item = 302
 except_clause = 303
 suite = 304
-test = 305
-test_nocond = 306
-lambdef = 307
-lambdef_nocond = 308
-or_test = 309
-and_test = 310
-not_test = 311
-comparison = 312
-comp_op = 313
-star_expr = 314
-expr = 315
-xor_expr = 316
-and_expr = 317
-shift_expr = 318
-arith_expr = 319
-term = 320
-factor = 321
-power = 322
-atom_expr = 323
-atom = 324
-testlist_comp = 325
-trailer = 326
-subscriptlist = 327
-subscript = 328
-sliceop = 329
-exprlist = 330
-testlist = 331
-dictorsetmaker = 332
-classdef = 333
-arglist = 334
-argument = 335
-comp_iter = 336
-sync_comp_for = 337
-comp_for = 338
-comp_if = 339
-encoding_decl = 340
-yield_expr = 341
-yield_arg = 342
+namedexpr_test = 305
+test = 306
+test_nocond = 307
+lambdef = 308
+lambdef_nocond = 309
+or_test = 310
+and_test = 311
+not_test = 312
+comparison = 313
+comp_op = 314
+star_expr = 315
+expr = 316
+xor_expr = 317
+and_expr = 318
+shift_expr = 319
+arith_expr = 320
+term = 321
+factor = 322
+power = 323
+atom_expr = 324
+atom = 325
+testlist_comp = 326
+trailer = 327
+subscriptlist = 328
+subscript = 329
+sliceop = 330
+exprlist = 331
+testlist = 332
+dictorsetmaker = 333
+classdef = 334
+arglist = 335
+argument = 336
+comp_iter = 337
+sync_comp_for = 338
+comp_for = 339
+comp_if = 340
+encoding_decl = 341
+yield_expr = 342
+yield_arg = 343
 #--end constants--
 
 sym_name = {}
diff --git a/Lib/test/exception_hierarchy.txt b/Lib/test/exception_hierarchy.txt
index 763a6c8..15f4491 100644
--- a/Lib/test/exception_hierarchy.txt
+++ b/Lib/test/exception_hierarchy.txt
@@ -42,6 +42,7 @@ BaseException
       |    +-- NotImplementedError
       |    +-- RecursionError
       +-- SyntaxError
+      |    +-- TargetScopeError
       |    +-- IndentationError
       |         +-- TabError
       +-- SystemError
diff --git a/Lib/test/test_named_expressions.py b/Lib/test/test_named_expressions.py
new file mode 100644
index 0000000..e49fd7d
--- /dev/null
+++ b/Lib/test/test_named_expressions.py
@@ -0,0 +1,415 @@
+import os
+import unittest
+
+
+class NamedExpressionInvalidTest(unittest.TestCase):
+
+    def test_named_expression_invalid_01(self):
+        code = """x := 0"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_02(self):
+        code = """x = y := 0"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_03(self):
+        code = """y := f(x)"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_04(self):
+        code = """y0 = y1 := f(x)"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_06(self):
+        code = """((a, b) := (1, 2))"""
+
+        with self.assertRaisesRegex(SyntaxError, "cannot use named assignment with tuple"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_07(self):
+        code = """def spam(a = b := 42): pass"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_08(self):
+        code = """def spam(a: b := 42 = 5): pass"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_09(self):
+        code = """spam(a=b := 'c')"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_10(self):
+        code = """spam(x = y := f(x))"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_11(self):
+        code = """spam(a=1, b := 2)"""
+
+        with self.assertRaisesRegex(SyntaxError,
+            "positional argument follows keyword argument"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_12(self):
+        code = """spam(a=1, (b := 2))"""
+
+        with self.assertRaisesRegex(SyntaxError,
+            "positional argument follows keyword argument"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_13(self):
+        code = """spam(a=1, (b := 2))"""
+
+        with self.assertRaisesRegex(SyntaxError,
+            "positional argument follows keyword argument"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_14(self):
+        code = """(x := lambda: y := 1)"""
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_15(self):
+        code = """(lambda: x := 1)"""
+
+        with self.assertRaisesRegex(SyntaxError,
+            "cannot use named assignment with lambda"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_16(self):
+        code = "[i + 1 for i in i := [1,2]]"
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_17(self):
+        code = "[i := 0, j := 1 for i, j in [(1, 2), (3, 4)]]"
+
+        with self.assertRaisesRegex(SyntaxError, "invalid syntax"):
+            exec(code, {}, {})
+
+    def test_named_expression_invalid_18(self):
+        code = """class Foo():
+            [(42, 1 + ((( j := i )))) for i in range(5)]
+        """
+
+        with self.assertRaisesRegex(TargetScopeError,
+            "named expression within a comprehension cannot be used in a class body"):
+            exec(code, {}, {})
+
+
+class NamedExpressionAssignmentTest(unittest.TestCase):
+
+    def test_named_expression_assignment_01(self):
+        (a := 10)
+
+        self.assertEqual(a, 10)
+
+    def test_named_expression_assignment_02(self):
+        a = 20
+        (a := a)
+
+        self.assertEqual(a, 20)
+
+    def test_named_expression_assignment_03(self):
+        (total := 1 + 2)
+
+        self.assertEqual(total, 3)
+
+    def test_named_expression_assignment_04(self):
+        (info := (1, 2, 3))
+
+        self.assertEqual(info, (1, 2, 3))
+
+    def test_named_expression_assignment_05(self):
+        (x := 1, 2)
+
+        self.assertEqual(x, 1)
+
+    def test_named_expression_assignment_06(self):
+        (z := (y := (x := 0)))
+
+        self.assertEqual(x, 0)
+        self.assertEqual(y, 0)
+        self.assertEqual(z, 0)
+
+    def test_named_expression_assignment_07(self):
+        (loc := (1, 2))
+
+        self.assertEqual(loc, (1, 2))
+
+    def test_named_expression_assignment_08(self):
+        if spam := "eggs":
+            self.assertEqual(spam, "eggs")
+        else: self.fail("variable was not assigned using named expression")
+
+    def test_named_expression_assignment_09(self):
+        if True and (spam := True):
+            self.assertTrue(spam)
+        else: self.fail("variable was not assigned using named expression")
+
+    def test_named_expression_assignment_10(self):
+        if (match := 10) is 10:
+            pass
+        else: self.fail("variable was not assigned using named expression")
+
+    def test_named_expression_assignment_11(self):
+        def spam(a):
+            return a
+        input_data = [1, 2, 3]
+        res = [(x, y, x/y) for x in input_data if (y := spam(x)) > 0]
+
+        self.assertEqual(res, [(1, 1, 1.0), (2, 2, 1.0), (3, 3, 1.0)])
+
+    def test_named_expression_assignment_12(self):
+        def spam(a):
+            return a
+        res = [[y := spam(x), x/y] for x in range(1, 5)]
+
+        self.assertEqual(res, [[1, 1.0], [2, 1.0], [3, 1.0], [4, 1.0]])
+
+    def test_named_expression_assignment_13(self):
+        length = len(lines := [1, 2])
+
+        self.assertEqual(length, 2)
+        self.assertEqual(lines, [1,2])
+
+    def test_named_expression_assignment_14(self):
+        """
+        Where all variables are positive integers, and a is at least as large
+        as the n'th root of x, this algorithm returns the floor of the n'th
+        root of x (and roughly doubling the number of accurate bits per
+        iteration)::
+        """
+        a = 9
+        n = 2
+        x = 3
+
+        while a > (d := x // a**(n-1)):
+            a = ((n-1)*a + d) // n
+
+        self.assertEqual(a, 1)
+
+
+class NamedExpressionScopeTest(unittest.TestCase):
+
+    def test_named_expression_scope_01(self):
+        code = """def spam():
+    (a := 5)
+print(a)"""
+
+        with self.assertRaisesRegex(NameError, "name 'a' is not defined"):
+            exec(code, {}, {})
+
+    def test_named_expression_scope_02(self):
+        total = 0
+        partial_sums = [total := total + v for v in range(5)]
+
+        self.assertEqual(partial_sums, [0, 1, 3, 6, 10])
+        self.assertEqual(total, 10)
+
+    def test_named_expression_scope_03(self):
+        containsOne = any((lastNum := num) == 1 for num in [1, 2, 3])
+
+        self.assertTrue(containsOne)
+        self.assertEqual(lastNum, 1)
+
+    def test_named_expression_scope_04(self):
+        def spam(a):
+            return a
+        res = [[y := spam(x), x/y] for x in range(1, 5)]
+
+        self.assertEqual(y, 4)
+
+    def test_named_expression_scope_05(self):
+        def spam(a):
+            return a
+        input_data = [1, 2, 3]
+        res = [(x, y, x/y) for x in input_data if (y := spam(x)) > 0]
+
+        self.assertEqual(res, [(1, 1, 1.0), (2, 2, 1.0), (3, 3, 1.0)])
+        self.assertEqual(y, 3)
+
+    def test_named_expression_scope_06(self):
+        res = [[spam := i for i in range(3)] for j in range(2)]
+
+        self.assertEqual(res, [[0, 1, 2], [0, 1, 2]])
+        self.assertEqual(spam, 2)
+
+    def test_named_expression_scope_07(self):
+        len(lines := [1, 2])
+
+        self.assertEqual(lines, [1, 2])
+
+    def test_named_expression_scope_08(self):
+        def spam(a):
+            return a
+
+        def eggs(b):
+            return b * 2
+
+        res = [spam(a := eggs(b := h)) for h in range(2)]
+
+        self.assertEqual(res, [0, 2])
+        self.assertEqual(a, 2)
+        self.assertEqual(b, 1)
+
+    def test_named_expression_scope_09(self):
+        def spam(a):
+            return a
+
+        def eggs(b):
+            return b * 2
+
+        res = [spam(a := eggs(a := h)) for h in range(2)]
+
+        self.assertEqual(res, [0, 2])
+        self.assertEqual(a, 2)
+
+    def test_named_expression_scope_10(self):
+        res = [b := [a := 1 for i in range(2)] for j in range(2)]
+
+        self.assertEqual(res, [[1, 1], [1, 1]])
+        self.assertEqual(a, 1)
+        self.assertEqual(b, [1, 1])
+
+    def test_named_expression_scope_11(self):
+        res = [j := i for i in range(5)]
+
+        self.assertEqual(res, [0, 1, 2, 3, 4])
+        self.assertEqual(j, 4)
+
+    def test_named_expression_scope_12(self):
+        res = [i := i for i in range(5)]
+
+        self.assertEqual(res, [0, 1, 2, 3, 4])
+        self.assertEqual(i, 4)
+
+    def test_named_expression_scope_13(self):
+        res = [i := 0 for i, j in [(1, 2), (3, 4)]]
+
+        self.assertEqual(res, [0, 0])
+        self.assertEqual(i, 0)
+
+    def test_named_expression_scope_14(self):
+        res = [(i := 0, j := 1) for i, j in [(1, 2), (3, 4)]]
+
+        self.assertEqual(res, [(0, 1), (0, 1)])
+        self.assertEqual(i, 0)
+        self.assertEqual(j, 1)
+
+    def test_named_expression_scope_15(self):
+        res = [(i := i, j := j) for i, j in [(1, 2), (3, 4)]]
+
+        self.assertEqual(res, [(1, 2), (3, 4)])
+        self.assertEqual(i, 3)
+        self.assertEqual(j, 4)
+
+    def test_named_expression_scope_16(self):
+        res = [(i := j, j := i) for i, j in [(1, 2), (3, 4)]]
+
+        self.assertEqual(res, [(2, 2), (4, 4)])
+        self.assertEqual(i, 4)
+        self.assertEqual(j, 4)
+
+    def test_named_expression_scope_17(self):
+        b = 0
+        res = [b := i + b for i in range(5)]
+
+        self.assertEqual(res, [0, 1, 3, 6, 10])
+        self.assertEqual(b, 10)
+
+    def test_named_expression_scope_18(self):
+        def spam(a):
+            return a
+
+        res = spam(b := 2)
+
+        self.assertEqual(res, 2)
+        self.assertEqual(b, 2)
+
+    def test_named_expression_scope_19(self):
+        def spam(a):
+            return a
+
+        res = spam((b := 2))
+
+        self.assertEqual(res, 2)
+        self.assertEqual(b, 2)
+
+    def test_named_expression_scope_20(self):
+        def spam(a):
+            return a
+
+        res = spam(a=(b := 2))
+
+        self.assertEqual(res, 2)
+        self.assertEqual(b, 2)
+
+    def test_named_expression_scope_21(self):
+        def spam(a, b):
+            return a + b
+
+        res = spam(c := 2, b=1)
+
+        self.assertEqual(res, 3)
+        self.assertEqual(c, 2)
+
+    def test_named_expression_scope_22(self):
+        def spam(a, b):
+            return a + b
+
+        res = spam((c := 2), b=1)
+
+        self.assertEqual(res, 3)
+        self.assertEqual(c, 2)
+
+    def test_named_expression_scope_23(self):
+        def spam(a, b):
+            return a + b
+
+        res = spam(b=(c := 2), a=1)
+
+        self.assertEqual(res, 3)
+        self.assertEqual(c, 2)
+
+    def test_named_expression_scope_24(self):
+        a = 10
+        def spam():
+            nonlocal a
+            (a := 20)
+        spam()
+
+        self.assertEqual(a, 20)
+
+    def test_named_expression_scope_25(self):
+        ns = {}
+        code = """a = 10
+def spam():
+    global a
+    (a := 20)
+spam()"""
+
+        exec(code, ns, {})
+
+        self.assertEqual(ns["a"], 20)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/Lib/test/test_parser.py b/Lib/test/test_parser.py
index 9b58bb9..ac3899b 100644
--- a/Lib/test/test_parser.py
+++ b/Lib/test/test_parser.py
@@ -115,6 +115,7 @@ class RoundtripLegalSyntaxTestCase(unittest.TestCase):
         self.check_expr("foo * bar")
         self.check_expr("foo / bar")
         self.check_expr("foo // bar")
+        self.check_expr("(foo := 1)")
         self.check_expr("lambda: 0")
         self.check_expr("lambda x: 0")
         self.check_expr("lambda *y: 0")
@@ -421,6 +422,40 @@ class RoundtripLegalSyntaxTestCase(unittest.TestCase):
         self.check_expr('{x**2:x[3] for x in seq if condition(x)}')
         self.check_expr('{x:x for x in seq1 for y in seq2 if condition(x, y)}')
 
+    def test_named_expressions(self):
+        self.check_suite("(a := 1)")
+        self.check_suite("(a := a)")
+        self.check_suite("if (match := pattern.search(data)) is None: pass")
+        self.check_suite("[y := f(x), y**2, y**3]")
+        self.check_suite("filtered_data = [y for x in data if (y := f(x)) is None]")
+        self.check_suite("(y := f(x))")
+        self.check_suite("y0 = (y1 := f(x))")
+        self.check_suite("foo(x=(y := f(x)))")
+        self.check_suite("def foo(answer=(p := 42)): pass")
+        self.check_suite("def foo(answer: (p := 42) = 5): pass")
+        self.check_suite("lambda: (x := 1)")
+        self.check_suite("(x := lambda: 1)")
+        self.check_suite("(x := lambda: (y := 1))")  # not in PEP
+        self.check_suite("lambda line: (m := re.match(pattern, line)) and m.group(1)")
+        self.check_suite("x = (y := 0)")
+        self.check_suite("(z:=(y:=(x:=0)))")
+        self.check_suite("(info := (name, phone, *rest))")
+        self.check_suite("(x:=1,2)")
+        self.check_suite("(total := total + tax)")
+        self.check_suite("len(lines := f.readlines())")
+        self.check_suite("foo(x := 3, cat='vector')")
+        self.check_suite("foo(cat=(category := 'vector'))")
+        self.check_suite("if any(len(longline := l) >= 100 for l in lines): print(longline)")
+        self.check_suite(
+            "if env_base := os.environ.get('PYTHONUSERBASE', None): return env_base"
+        )
+        self.check_suite(
+            "if self._is_special and (ans := self._check_nans(context=context)): return ans"
+        )
+        self.check_suite("foo(b := 2, a=1)")
+        self.check_suite("foo(b := 2, a=1)")
+        self.check_suite("foo((b := 2), a=1)")
+        self.check_suite("foo(c=(b := 2), a=1)")
 
 #
 #  Second, we take *invalid* trees and make sure we get ParserError
@@ -694,16 +729,16 @@ class IllegalSyntaxTestCase(unittest.TestCase):
     def test_illegal_encoding(self):
         # Illegal encoding declaration
         tree = \
-            (340,
+            (341,
              (257, (0, '')))
         self.check_bad_tree(tree, "missed encoding")
         tree = \
-            (340,
+            (341,
              (257, (0, '')),
               b'iso-8859-1')
         self.check_bad_tree(tree, "non-string encoding")
         tree = \
-            (340,
+            (341,
              (257, (0, '')),
               '\udcff')
         with self.assertRaises(UnicodeEncodeError):
@@ -776,8 +811,9 @@ class ParserStackLimitTestCase(unittest.TestCase):
         return "["*level+"]"*level
 
     def test_deeply_nested_list(self):
-        # XXX used to be 99 levels in 2.x
-        e = self._nested_expression(93)
+        # This has fluctuated between 99 levels in 2.x, down to 93 levels in
+        # 3.7.X and back up to 99 in 3.8.X. Related to MAXSTACK size in Parser.h
+        e = self._nested_expression(99)
         st = parser.expr(e)
         st.compile()
 
diff --git a/Lib/test/test_tokenize.py b/Lib/test/test_tokenize.py
index 04a1254..4c90092 100644
--- a/Lib/test/test_tokenize.py
+++ b/Lib/test/test_tokenize.py
@@ -1429,6 +1429,7 @@ class TestTokenize(TestCase):
         self.assertExactTypeEqual('**=', token.DOUBLESTAREQUAL)
         self.assertExactTypeEqual('//', token.DOUBLESLASH)
         self.assertExactTypeEqual('//=', token.DOUBLESLASHEQUAL)
+        self.assertExactTypeEqual(':=', token.COLONEQUAL)
         self.assertExactTypeEqual('...', token.ELLIPSIS)
         self.assertExactTypeEqual('->', token.RARROW)
         self.assertExactTypeEqual('@', token.AT)
diff --git a/Lib/token.py b/Lib/token.py
index 5af7e6b..7224eca 100644
--- a/Lib/token.py
+++ b/Lib/token.py
@@ -56,13 +56,14 @@ AT = 49
 ATEQUAL = 50
 RARROW = 51
 ELLIPSIS = 52
-OP = 53
+COLONEQUAL = 53
+OP = 54
 # These aren't used by the C tokenizer but are needed for tokenize.py
-ERRORTOKEN = 54
-COMMENT = 55
-NL = 56
-ENCODING = 57
-N_TOKENS = 58
+ERRORTOKEN = 55
+COMMENT = 56
+NL = 57
+ENCODING = 58
+N_TOKENS = 59
 # Special definitions for cooperation with parser
 NT_OFFSET = 256
 
@@ -96,6 +97,7 @@ EXACT_TOKEN_TYPES = {
     '//=': DOUBLESLASHEQUAL,
     '/=': SLASHEQUAL,
     ':': COLON,
+    ':=': COLONEQUAL,
     ';': SEMI,
     '<': LESS,
     '<<': LEFTSHIFT,
diff --git a/Misc/NEWS.d/next/Core and Builtins/2018-11-13-14-26-54.bpo-35224.F0B6UQ.rst b/Misc/NEWS.d/next/Core and Builtins/2018-11-13-14-26-54.bpo-35224.F0B6UQ.rst
new file mode 100644
index 0000000..fe54f36
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2018-11-13-14-26-54.bpo-35224.F0B6UQ.rst
@@ -0,0 +1 @@
+Implement :pep:`572` (assignment expressions). Patch by Emily Morehouse.
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index 35e1df3..75ede1c 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -1521,6 +1521,13 @@ MiddlingExtendsException(PyExc_SyntaxError, IndentationError, SyntaxError,
 
 
 /*
+ *    TargetScopeError extends SyntaxError
+ */
+MiddlingExtendsException(PyExc_SyntaxError, TargetScopeError, SyntaxError,
+                         "Improper scope target.");
+
+
+/*
  *    TabError extends IndentationError
  */
 MiddlingExtendsException(PyExc_IndentationError, TabError, SyntaxError,
@@ -2531,6 +2538,7 @@ _PyExc_Init(void)
     PRE_INIT(AttributeError);
     PRE_INIT(SyntaxError);
     PRE_INIT(IndentationError);
+    PRE_INIT(TargetScopeError);
     PRE_INIT(TabError);
     PRE_INIT(LookupError);
     PRE_INIT(IndexError);
@@ -2671,6 +2679,7 @@ _PyBuiltins_AddExceptions(PyObject *bltinmod)
     POST_INIT(AttributeError);
     POST_INIT(SyntaxError);
     POST_INIT(IndentationError);
+    POST_INIT(TargetScopeError);
     POST_INIT(TabError);
     POST_INIT(LookupError);
     POST_INIT(IndexError);
diff --git a/PC/python3.def b/PC/python3.def
index 5d93c18..e317864 100644
--- a/PC/python3.def
+++ b/PC/python3.def
@@ -235,6 +235,7 @@ EXPORTS
   PyExc_SystemError=python38.PyExc_SystemError DATA
   PyExc_SystemExit=python38.PyExc_SystemExit DATA
   PyExc_TabError=python38.PyExc_TabError DATA
+  PyExc_TargetScopeError=python38.PyExc_TargetScopeError DATA
   PyExc_TimeoutError=python38.PyExc_TimeoutError DATA
   PyExc_TypeError=python38.PyExc_TypeError DATA
   PyExc_UnboundLocalError=python38.PyExc_UnboundLocalError DATA
diff --git a/Parser/Python.asdl b/Parser/Python.asdl
index cedf37a..7b2a873 100644
--- a/Parser/Python.asdl
+++ b/Parser/Python.asdl
@@ -54,6 +54,7 @@ module Python
 
           -- BoolOp() can use left & right?
     expr = BoolOp(boolop op, expr* values)
+         | NamedExpr(expr target, expr value)
          | BinOp(expr left, operator op, expr right)
          | UnaryOp(unaryop op, expr operand)
          | Lambda(arguments args, expr body)
@@ -87,7 +88,7 @@ module Python
           -- col_offset is the byte offset in the utf8 string the parser uses
           attributes (int lineno, int col_offset, int? end_lineno, int? end_col_offset)
 
-    expr_context = Load | Store | Del | AugLoad | AugStore | Param
+    expr_context = Load | Store | Del | AugLoad | AugStore | Param | NamedStore
 
     slice = Slice(expr? lower, expr? upper, expr? step)
           | ExtSlice(slice* dims)
diff --git a/Parser/parser.h b/Parser/parser.h
index 95cd39d..aee1c86 100644
--- a/Parser/parser.h
+++ b/Parser/parser.h
@@ -7,7 +7,7 @@ extern "C" {
 
 /* Parser interface */
 
-#define MAXSTACK 1500
+#define MAXSTACK 1700
 
 typedef struct {
     int              s_state;       /* State in current DFA */
diff --git a/Parser/token.c b/Parser/token.c
index 35519aa..d27f98a 100644
--- a/Parser/token.c
+++ b/Parser/token.c
@@ -59,6 +59,7 @@ const char * const _PyParser_TokenNames[] = {
     "ATEQUAL",
     "RARROW",
     "ELLIPSIS",
+    "COLONEQUAL",
     "OP",
     "<ERRORTOKEN>",
     "<COMMENT>",
@@ -142,6 +143,11 @@ PyToken_TwoChars(int c1, int c2)
         case '=': return SLASHEQUAL;
         }
         break;
+    case ':':
+        switch (c2) {
+        case '=': return COLONEQUAL;
+        }
+        break;
     case '<':
         switch (c2) {
         case '<': return LEFTSHIFT;
diff --git a/Python/Python-ast.c b/Python/Python-ast.c
index e6c5bfe..a333ff9 100644
--- a/Python/Python-ast.c
+++ b/Python/Python-ast.c
@@ -203,6 +203,11 @@ static char *BoolOp_fields[]={
     "op",
     "values",
 };
+static PyTypeObject *NamedExpr_type;
+static char *NamedExpr_fields[]={
+    "target",
+    "value",
+};
 static PyTypeObject *BinOp_type;
 _Py_IDENTIFIER(left);
 _Py_IDENTIFIER(right);
@@ -344,7 +349,8 @@ static char *Tuple_fields[]={
 };
 static PyTypeObject *expr_context_type;
 static PyObject *Load_singleton, *Store_singleton, *Del_singleton,
-*AugLoad_singleton, *AugStore_singleton, *Param_singleton;
+*AugLoad_singleton, *AugStore_singleton, *Param_singleton,
+*NamedStore_singleton;
 static PyObject* ast2obj_expr_context(expr_context_ty);
 static PyTypeObject *Load_type;
 static PyTypeObject *Store_type;
@@ -352,6 +358,7 @@ static PyTypeObject *Del_type;
 static PyTypeObject *AugLoad_type;
 static PyTypeObject *AugStore_type;
 static PyTypeObject *Param_type;
+static PyTypeObject *NamedStore_type;
 static PyTypeObject *slice_type;
 static PyObject* ast2obj_slice(void*);
 static PyTypeObject *Slice_type;
@@ -872,6 +879,8 @@ static int init_types(void)
     if (!add_attributes(expr_type, expr_attributes, 4)) return 0;
     BoolOp_type = make_type("BoolOp", expr_type, BoolOp_fields, 2);
     if (!BoolOp_type) return 0;
+    NamedExpr_type = make_type("NamedExpr", expr_type, NamedExpr_fields, 2);
+    if (!NamedExpr_type) return 0;
     BinOp_type = make_type("BinOp", expr_type, BinOp_fields, 3);
     if (!BinOp_type) return 0;
     UnaryOp_type = make_type("UnaryOp", expr_type, UnaryOp_fields, 2);
@@ -949,6 +958,10 @@ static int init_types(void)
     if (!Param_type) return 0;
     Param_singleton = PyType_GenericNew(Param_type, NULL, NULL);
     if (!Param_singleton) return 0;
+    NamedStore_type = make_type("NamedStore", expr_context_type, NULL, 0);
+    if (!NamedStore_type) return 0;
+    NamedStore_singleton = PyType_GenericNew(NamedStore_type, NULL, NULL);
+    if (!NamedStore_singleton) return 0;
     slice_type = make_type("slice", &AST_type, NULL, 0);
     if (!slice_type) return 0;
     if (!add_attributes(slice_type, NULL, 0)) return 0;
@@ -1773,6 +1786,34 @@ BoolOp(boolop_ty op, asdl_seq * values, int lineno, int col_offset, int
 }
 
 expr_ty
+NamedExpr(expr_ty target, expr_ty value, int lineno, int col_offset, int
+          end_lineno, int end_col_offset, PyArena *arena)
+{
+    expr_ty p;
+    if (!target) {
+        PyErr_SetString(PyExc_ValueError,
+                        "field target is required for NamedExpr");
+        return NULL;
+    }
+    if (!value) {
+        PyErr_SetString(PyExc_ValueError,
+                        "field value is required for NamedExpr");
+        return NULL;
+    }
+    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
+    if (!p)
+        return NULL;
+    p->kind = NamedExpr_kind;
+    p->v.NamedExpr.target = target;
+    p->v.NamedExpr.value = value;
+    p->lineno = lineno;
+    p->col_offset = col_offset;
+    p->end_lineno = end_lineno;
+    p->end_col_offset = end_col_offset;
+    return p;
+}
+
+expr_ty
 BinOp(expr_ty left, operator_ty op, expr_ty right, int lineno, int col_offset,
       int end_lineno, int end_col_offset, PyArena *arena)
 {
@@ -3062,6 +3103,20 @@ ast2obj_expr(void* _o)
             goto failed;
         Py_DECREF(value);
         break;
+    case NamedExpr_kind:
+        result = PyType_GenericNew(NamedExpr_type, NULL, NULL);
+        if (!result) goto failed;
+        value = ast2obj_expr(o->v.NamedExpr.target);
+        if (!value) goto failed;
+        if (_PyObject_SetAttrId(result, &PyId_target, value) == -1)
+            goto failed;
+        Py_DECREF(value);
+        value = ast2obj_expr(o->v.NamedExpr.value);
+        if (!value) goto failed;
+        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
+            goto failed;
+        Py_DECREF(value);
+        break;
     case BinOp_kind:
         result = PyType_GenericNew(BinOp_type, NULL, NULL);
         if (!result) goto failed;
@@ -3464,6 +3519,9 @@ PyObject* ast2obj_expr_context(expr_context_ty o)
         case Param:
             Py_INCREF(Param_singleton);
             return Param_singleton;
+        case NamedStore:
+            Py_INCREF(NamedStore_singleton);
+            return NamedStore_singleton;
         default:
             /* should never happen, but just in case ... */
             PyErr_Format(PyExc_SystemError, "unknown expr_context found");
@@ -5895,6 +5953,45 @@ obj2ast_expr(PyObject* obj, expr_ty* out, PyArena* arena)
         if (*out == NULL) goto failed;
         return 0;
     }
+    isinstance = PyObject_IsInstance(obj, (PyObject*)NamedExpr_type);
+    if (isinstance == -1) {
+        return 1;
+    }
+    if (isinstance) {
+        expr_ty target;
+        expr_ty value;
+
+        if (_PyObject_LookupAttrId(obj, &PyId_target, &tmp) < 0) {
+            return 1;
+        }
+        if (tmp == NULL) {
+            PyErr_SetString(PyExc_TypeError, "required field \"target\" missing from NamedExpr");
+            return 1;
+        }
+        else {
+            int res;
+            res = obj2ast_expr(tmp, &target, arena);
+            if (res != 0) goto failed;
+            Py_CLEAR(tmp);
+        }
+        if (_PyObject_LookupAttrId(obj, &PyId_value, &tmp) < 0) {
+            return 1;
+        }
+        if (tmp == NULL) {
+            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from NamedExpr");
+            return 1;
+        }
+        else {
+            int res;
+            res = obj2ast_expr(tmp, &value, arena);
+            if (res != 0) goto failed;
+            Py_CLEAR(tmp);
+        }
+        *out = NamedExpr(target, value, lineno, col_offset, end_lineno,
+                         end_col_offset, arena);
+        if (*out == NULL) goto failed;
+        return 0;
+    }
     isinstance = PyObject_IsInstance(obj, (PyObject*)BinOp_type);
     if (isinstance == -1) {
         return 1;
@@ -7156,6 +7253,14 @@ obj2ast_expr_context(PyObject* obj, expr_context_ty* out, PyArena* arena)
         *out = Param;
         return 0;
     }
+    isinstance = PyObject_IsInstance(obj, (PyObject *)NamedStore_type);
+    if (isinstance == -1) {
+        return 1;
+    }
+    if (isinstance) {
+        *out = NamedStore;
+        return 0;
+    }
 
     PyErr_Format(PyExc_TypeError, "expected some sort of expr_context, but got %R", obj);
     return 1;
@@ -8251,6 +8356,8 @@ PyInit__ast(void)
     if (PyDict_SetItemString(d, "expr", (PyObject*)expr_type) < 0) return NULL;
     if (PyDict_SetItemString(d, "BoolOp", (PyObject*)BoolOp_type) < 0) return
         NULL;
+    if (PyDict_SetItemString(d, "NamedExpr", (PyObject*)NamedExpr_type) < 0)
+        return NULL;
     if (PyDict_SetItemString(d, "BinOp", (PyObject*)BinOp_type) < 0) return
         NULL;
     if (PyDict_SetItemString(d, "UnaryOp", (PyObject*)UnaryOp_type) < 0) return
@@ -8306,6 +8413,8 @@ PyInit__ast(void)
         return NULL;
     if (PyDict_SetItemString(d, "Param", (PyObject*)Param_type) < 0) return
         NULL;
+    if (PyDict_SetItemString(d, "NamedStore", (PyObject*)NamedStore_type) < 0)
+        return NULL;
     if (PyDict_SetItemString(d, "slice", (PyObject*)slice_type) < 0) return
         NULL;
     if (PyDict_SetItemString(d, "Slice", (PyObject*)Slice_type) < 0) return
diff --git a/Python/ast.c b/Python/ast.c
index 855acca..6560026 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -94,6 +94,8 @@ expr_context_name(expr_context_ty ctx)
         return "Load";
     case Store:
         return "Store";
+    case NamedStore:
+        return "NamedStore";
     case Del:
         return "Del";
     case AugLoad:
@@ -975,14 +977,29 @@ set_context(struct compiling *c, expr_ty e, expr_context_ty ctx, const node *n)
 
     switch (e->kind) {
         case Attribute_kind:
+            if (ctx == NamedStore) {
+                expr_name = "attribute";
+                break;
+            }
+
             e->v.Attribute.ctx = ctx;
             if (ctx == Store && forbidden_name(c, e->v.Attribute.attr, n, 1))
                 return 0;
             break;
         case Subscript_kind:
+            if (ctx == NamedStore) {
+                expr_name = "subscript";
+                break;
+            }
+
             e->v.Subscript.ctx = ctx;
             break;
         case Starred_kind:
+            if (ctx == NamedStore) {
+                expr_name = "starred";
+                break;
+            }
+
             e->v.Starred.ctx = ctx;
             if (!set_context(c, e->v.Starred.value, ctx, n))
                 return 0;
@@ -995,10 +1012,20 @@ set_context(struct compiling *c, expr_ty e, expr_context_ty ctx, const node *n)
             e->v.Name.ctx = ctx;
             break;
         case List_kind:
+            if (ctx == NamedStore) {
+                expr_name = "list";
+                break;
+            }
+
             e->v.List.ctx = ctx;
             s = e->v.List.elts;
             break;
         case Tuple_kind:
+            if (ctx == NamedStore) {
+                expr_name = "tuple";
+                break;
+            }
+
             e->v.Tuple.ctx = ctx;
             s = e->v.Tuple.elts;
             break;
@@ -1060,17 +1087,27 @@ set_context(struct compiling *c, expr_ty e, expr_context_ty ctx, const node *n)
         case IfExp_kind:
             expr_name = "conditional expression";
             break;
+        case NamedExpr_kind:
+            expr_name = "named expression";
+            break;
         default:
             PyErr_Format(PyExc_SystemError,
-                         "unexpected expression in assignment %d (line %d)",
+                         "unexpected expression in %sassignment %d (line %d)",
+                         ctx == NamedStore ? "named ": "",
                          e->kind, e->lineno);
             return 0;
     }
     /* Check for error string set by switch */
     if (expr_name) {
-        return ast_error(c, n, "cannot %s %s",
+        if (ctx == NamedStore) {
+            return ast_error(c, n, "cannot use named assignment with %s",
+                         expr_name);
+        }
+        else {
+            return ast_error(c, n, "cannot %s %s",
                          ctx == Store ? "assign to" : "delete",
                          expr_name);
+        }
     }
 
     /* If the LHS is a list or tuple, we need to set the assignment
@@ -1198,7 +1235,7 @@ seq_for_testlist(struct compiling *c, const node *n)
 
     for (i = 0; i < NCH(n); i += 2) {
         const node *ch = CHILD(n, i);
-        assert(TYPE(ch) == test || TYPE(ch) == test_nocond || TYPE(ch) == star_expr);
+        assert(TYPE(ch) == test || TYPE(ch) == test_nocond || TYPE(ch) == star_expr || TYPE(ch) == namedexpr_test);
 
         expression = ast_for_expr(c, ch);
         if (!expression)
@@ -1692,6 +1729,35 @@ ast_for_decorated(struct compiling *c, const node *n)
 }
 
 static expr_ty
+ast_for_namedexpr(struct compiling *c, const node *n)
+{
+    /* if_stmt: 'if' namedexpr_test ':' suite ('elif' namedexpr_test ':' suite)*
+         ['else' ':' suite]
+       namedexpr_test: test [':=' test]
+       argument: ( test [comp_for] |
+            test ':=' test |
+            test '=' test |
+            '**' test |
+            '*' test )
+    */
+    expr_ty target, value;
+
+    target = ast_for_expr(c, CHILD(n, 0));
+    if (!target)
+        return NULL;
+
+    value = ast_for_expr(c, CHILD(n, 2));
+    if (!value)
+        return NULL;
+
+    if (!set_context(c, target, NamedStore, n))
+        return NULL;
+
+    return NamedExpr(target, value, LINENO(n), n->n_col_offset, n->n_end_lineno,
+                     n->n_end_col_offset, c->c_arena);
+}
+
+static expr_ty
 ast_for_lambdef(struct compiling *c, const node *n)
 {
     /* lambdef: 'lambda' [varargslist] ':' test
@@ -2568,6 +2634,7 @@ static expr_ty
 ast_for_expr(struct compiling *c, const node *n)
 {
     /* handle the full range of simple expressions
+       namedexpr_test: test [':=' test]
        test: or_test ['if' or_test 'else' test] | lambdef
        test_nocond: or_test | lambdef_nocond
        or_test: and_test ('or' and_test)*
@@ -2591,6 +2658,10 @@ ast_for_expr(struct compiling *c, const node *n)
 
  loop:
     switch (TYPE(n)) {
+        case namedexpr_test:
+            if (NCH(n) == 3)
+                return ast_for_namedexpr(c, n);
+            /* Fallthrough */
         case test:
         case test_nocond:
             if (TYPE(CHILD(n, 0)) == lambdef ||
@@ -2770,6 +2841,9 @@ ast_for_call(struct compiling *c, const node *n, expr_ty func,
             }
             else if (TYPE(CHILD(ch, 0)) == STAR)
                 nargs++;
+            else if (TYPE(CHILD(ch, 1)) == COLONEQUAL) {
+                nargs++;
+            }
             else
                 /* TYPE(CHILD(ch, 0)) == DOUBLESTAR or keyword argument */
                 nkeywords++;
@@ -2850,6 +2924,26 @@ ast_for_call(struct compiling *c, const node *n, expr_ty func,
                     return NULL;
                 asdl_seq_SET(args, nargs++, e);
             }
+            else if (TYPE(CHILD(ch, 1)) == COLONEQUAL) {
+                /* treat colon equal as positional argument */
+                if (nkeywords) {
+                    if (ndoublestars) {
+                        ast_error(c, chch,
+                                "positional argument follows "
+                                "keyword argument unpacking");
+                    }
+                    else {
+                        ast_error(c, chch,
+                                "positional argument follows "
+                                "keyword argument");
+                    }
+                    return NULL;
+                }
+                e = ast_for_namedexpr(c, ch);
+                if (!e)
+                    return NULL;
+                asdl_seq_SET(args, nargs++, e);
+            }
             else {
                 /* a keyword argument */
                 keyword_ty kw;
diff --git a/Python/compile.c b/Python/compile.c
index 9713bfc..eb2c302 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -3428,7 +3428,10 @@ compiler_nameop(struct compiler *c, identifier name, expr_context_ty ctx)
         case Load:
             op = (c->u->u_ste->ste_type == ClassBlock) ? LOAD_CLASSDEREF : LOAD_DEREF;
             break;
-        case Store: op = STORE_DEREF; break;
+        case Store:
+        case NamedStore:
+            op = STORE_DEREF;
+            break;
         case AugLoad:
         case AugStore:
             break;
@@ -3443,7 +3446,10 @@ compiler_nameop(struct compiler *c, identifier name, expr_context_ty ctx)
     case OP_FAST:
         switch (ctx) {
         case Load: op = LOAD_FAST; break;
-        case Store: op = STORE_FAST; break;
+        case Store:
+        case NamedStore:
+            op = STORE_FAST;
+            break;
         case Del: op = DELETE_FAST; break;
         case AugLoad:
         case AugStore:
@@ -3459,7 +3465,10 @@ compiler_nameop(struct compiler *c, identifier name, expr_context_ty ctx)
     case OP_GLOBAL:
         switch (ctx) {
         case Load: op = LOAD_GLOBAL; break;
-        case Store: op = STORE_GLOBAL; break;
+        case Store:
+        case NamedStore:
+            op = STORE_GLOBAL;
+            break;
         case Del: op = DELETE_GLOBAL; break;
         case AugLoad:
         case AugStore:
@@ -3474,7 +3483,10 @@ compiler_nameop(struct compiler *c, identifier name, expr_context_ty ctx)
     case OP_NAME:
         switch (ctx) {
         case Load: op = LOAD_NAME; break;
-        case Store: op = STORE_NAME; break;
+        case Store:
+        case NamedStore:
+            op = STORE_NAME;
+            break;
         case Del: op = DELETE_NAME; break;
         case AugLoad:
         case AugStore:
@@ -3592,7 +3604,7 @@ static int
 compiler_list(struct compiler *c, expr_ty e)
 {
     asdl_seq *elts = e->v.List.elts;
-    if (e->v.List.ctx == Store) {
+    if (e->v.List.ctx == Store || e->v.List.ctx == NamedStore) {
         return assignment_helper(c, elts);
     }
     else if (e->v.List.ctx == Load) {
@@ -3608,7 +3620,7 @@ static int
 compiler_tuple(struct compiler *c, expr_ty e)
 {
     asdl_seq *elts = e->v.Tuple.elts;
-    if (e->v.Tuple.ctx == Store) {
+    if (e->v.Tuple.ctx == Store || e->v.Tuple.ctx == NamedStore) {
         return assignment_helper(c, elts);
     }
     else if (e->v.Tuple.ctx == Load) {
@@ -4569,6 +4581,11 @@ static int
 compiler_visit_expr1(struct compiler *c, expr_ty e)
 {
     switch (e->kind) {
+    case NamedExpr_kind:
+        VISIT(c, expr, e->v.NamedExpr.value);
+        ADDOP(c, DUP_TOP);
+        VISIT(c, expr, e->v.NamedExpr.target);
+        break;
     case BoolOp_kind:
         return compiler_boolop(c, e);
     case BinOp_kind:
@@ -5003,6 +5020,7 @@ compiler_handle_subscr(struct compiler *c, const char *kind,
         case AugStore:/* fall through to Store */
         case Store:   op = STORE_SUBSCR; break;
         case Del:     op = DELETE_SUBSCR; break;
+        case NamedStore:
         case Param:
             PyErr_Format(PyExc_SystemError,
                          "invalid %s kind %d in subscript\n",
diff --git a/Python/graminit.c b/Python/graminit.c
index 0a681f7..91092f1 100644
--- a/Python/graminit.c
+++ b/Python/graminit.c
@@ -891,7 +891,7 @@ static arc arcs_41_0[1] = {
     {97, 1},
 };
 static arc arcs_41_1[1] = {
-    {26, 2},
+    {98, 2},
 };
 static arc arcs_41_2[1] = {
     {27, 3},
@@ -900,8 +900,8 @@ static arc arcs_41_3[1] = {
     {28, 4},
 };
 static arc arcs_41_4[3] = {
-    {98, 1},
-    {99, 5},
+    {99, 1},
+    {100, 5},
     {0, 4},
 };
 static arc arcs_41_5[1] = {
@@ -924,7 +924,7 @@ static state states_41[8] = {
     {1, arcs_41_7},
 };
 static arc arcs_42_0[1] = {
-    {100, 1},
+    {101, 1},
 };
 static arc arcs_42_1[1] = {
     {26, 2},
@@ -936,7 +936,7 @@ static arc arcs_42_3[1] = {
     {28, 4},
 };
 static arc arcs_42_4[2] = {
-    {99, 5},
+    {100, 5},
     {0, 4},
 };
 static arc arcs_42_5[1] = {
@@ -959,13 +959,13 @@ static state states_42[8] = {
     {1, arcs_42_7},
 };
 static arc arcs_43_0[1] = {
-    {101, 1},
+    {102, 1},
 };
 static arc arcs_43_1[1] = {
     {66, 2},
 };
 static arc arcs_43_2[1] = {
-    {102, 3},
+    {103, 3},
 };
 static arc arcs_43_3[1] = {
     {9, 4},
@@ -977,7 +977,7 @@ static arc arcs_43_5[1] = {
     {28, 6},
 };
 static arc arcs_43_6[2] = {
-    {99, 7},
+    {100, 7},
     {0, 6},
 };
 static arc arcs_43_7[1] = {
@@ -1002,7 +1002,7 @@ static state states_43[10] = {
     {1, arcs_43_9},
 };
 static arc arcs_44_0[1] = {
-    {103, 1},
+    {104, 1},
 };
 static arc arcs_44_1[1] = {
     {27, 2},
@@ -1011,8 +1011,8 @@ static arc arcs_44_2[1] = {
     {28, 3},
 };
 static arc arcs_44_3[2] = {
-    {104, 4},
-    {105, 5},
+    {105, 4},
+    {106, 5},
 };
 static arc arcs_44_4[1] = {
     {27, 6},
@@ -1027,9 +1027,9 @@ static arc arcs_44_7[1] = {
     {28, 9},
 };
 static arc arcs_44_8[4] = {
-    {104, 4},
-    {99, 10},
-    {105, 5},
+    {105, 4},
+    {100, 10},
+    {106, 5},
     {0, 8},
 };
 static arc arcs_44_9[1] = {
@@ -1042,7 +1042,7 @@ static arc arcs_44_11[1] = {
     {28, 12},
 };
 static arc arcs_44_12[2] = {
-    {105, 5},
+    {106, 5},
     {0, 12},
 };
 static state states_44[13] = {
@@ -1061,10 +1061,10 @@ static state states_44[13] = {
     {2, arcs_44_12},
 };
 static arc arcs_45_0[1] = {
-    {106, 1},
+    {107, 1},
 };
 static arc arcs_45_1[1] = {
-    {107, 2},
+    {108, 2},
 };
 static arc arcs_45_2[2] = {
     {32, 1},
@@ -1091,7 +1091,7 @@ static arc arcs_46_1[2] = {
     {0, 1},
 };
 static arc arcs_46_2[1] = {
-    {108, 3},
+    {109, 3},
 };
 static arc arcs_46_3[1] = {
     {0, 3},
@@ -1103,7 +1103,7 @@ static state states_46[4] = {
     {1, arcs_46_3},
 };
 static arc arcs_47_0[1] = {
-    {109, 1},
+    {110, 1},
 };
 static arc arcs_47_1[2] = {
     {26, 2},
@@ -1134,14 +1134,14 @@ static arc arcs_48_1[1] = {
     {0, 1},
 };
 static arc arcs_48_2[1] = {
-    {110, 3},
+    {111, 3},
 };
 static arc arcs_48_3[1] = {
     {6, 4},
 };
 static arc arcs_48_4[2] = {
     {6, 4},
-    {111, 1},
+    {112, 1},
 };
 static state states_48[5] = {
     {2, arcs_48_0},
@@ -1150,70 +1150,66 @@ static state states_48[5] = {
     {1, arcs_48_3},
     {2, arcs_48_4},
 };
-static arc arcs_49_0[2] = {
-    {112, 1},
-    {113, 2},
+static arc arcs_49_0[1] = {
+    {26, 1},
 };
 static arc arcs_49_1[2] = {
-    {97, 3},
+    {113, 2},
     {0, 1},
 };
 static arc arcs_49_2[1] = {
-    {0, 2},
+    {26, 3},
 };
 static arc arcs_49_3[1] = {
-    {112, 4},
-};
-static arc arcs_49_4[1] = {
-    {99, 5},
-};
-static arc arcs_49_5[1] = {
-    {26, 2},
+    {0, 3},
 };
-static state states_49[6] = {
-    {2, arcs_49_0},
+static state states_49[4] = {
+    {1, arcs_49_0},
     {2, arcs_49_1},
     {1, arcs_49_2},
     {1, arcs_49_3},
-    {1, arcs_49_4},
-    {1, arcs_49_5},
 };
 static arc arcs_50_0[2] = {
-    {112, 1},
-    {115, 1},
+    {114, 1},
+    {115, 2},
 };
-static arc arcs_50_1[1] = {
+static arc arcs_50_1[2] = {
+    {97, 3},
     {0, 1},
 };
-static state states_50[2] = {
-    {2, arcs_50_0},
-    {1, arcs_50_1},
+static arc arcs_50_2[1] = {
+    {0, 2},
 };
-static arc arcs_51_0[1] = {
-    {116, 1},
+static arc arcs_50_3[1] = {
+    {114, 4},
 };
-static arc arcs_51_1[2] = {
-    {35, 2},
-    {27, 3},
+static arc arcs_50_4[1] = {
+    {100, 5},
 };
-static arc arcs_51_2[1] = {
-    {27, 3},
+static arc arcs_50_5[1] = {
+    {26, 2},
 };
-static arc arcs_51_3[1] = {
-    {26, 4},
+static state states_50[6] = {
+    {2, arcs_50_0},
+    {2, arcs_50_1},
+    {1, arcs_50_2},
+    {1, arcs_50_3},
+    {1, arcs_50_4},
+    {1, arcs_50_5},
+};
+static arc arcs_51_0[2] = {
+    {114, 1},
+    {117, 1},
 };
-static arc arcs_51_4[1] = {
-    {0, 4},
+static arc arcs_51_1[1] = {
+    {0, 1},
 };
-static state states_51[5] = {
-    {1, arcs_51_0},
-    {2, arcs_51_1},
-    {1, arcs_51_2},
-    {1, arcs_51_3},
-    {1, arcs_51_4},
+static state states_51[2] = {
+    {2, arcs_51_0},
+    {1, arcs_51_1},
 };
 static arc arcs_52_0[1] = {
-    {116, 1},
+    {118, 1},
 };
 static arc arcs_52_1[2] = {
     {35, 2},
@@ -1223,7 +1219,7 @@ static arc arcs_52_2[1] = {
     {27, 3},
 };
 static arc arcs_52_3[1] = {
-    {114, 4},
+    {26, 4},
 };
 static arc arcs_52_4[1] = {
     {0, 4},
@@ -1236,15 +1232,27 @@ static state states_52[5] = {
     {1, arcs_52_4},
 };
 static arc arcs_53_0[1] = {
-    {117, 1},
+    {118, 1},
 };
 static arc arcs_53_1[2] = {
-    {118, 0},
-    {0, 1},
+    {35, 2},
+    {27, 3},
+};
+static arc arcs_53_2[1] = {
+    {27, 3},
+};
+static arc arcs_53_3[1] = {
+    {116, 4},
 };
-static state states_53[2] = {
+static arc arcs_53_4[1] = {
+    {0, 4},
+};
+static state states_53[5] = {
     {1, arcs_53_0},
     {2, arcs_53_1},
+    {1, arcs_53_2},
+    {1, arcs_53_3},
+    {1, arcs_53_4},
 };
 static arc arcs_54_0[1] = {
     {119, 1},
@@ -1257,84 +1265,84 @@ static state states_54[2] = {
     {1, arcs_54_0},
     {2, arcs_54_1},
 };
-static arc arcs_55_0[2] = {
+static arc arcs_55_0[1] = {
     {121, 1},
-    {122, 2},
 };
-static arc arcs_55_1[1] = {
-    {119, 2},
+static arc arcs_55_1[2] = {
+    {122, 0},
+    {0, 1},
+};
+static state states_55[2] = {
+    {1, arcs_55_0},
+    {2, arcs_55_1},
 };
-static arc arcs_55_2[1] = {
+static arc arcs_56_0[2] = {
+    {123, 1},
+    {124, 2},
+};
+static arc arcs_56_1[1] = {
+    {121, 2},
+};
+static arc arcs_56_2[1] = {
     {0, 2},
 };
-static state states_55[3] = {
-    {2, arcs_55_0},
-    {1, arcs_55_1},
-    {1, arcs_55_2},
+static state states_56[3] = {
+    {2, arcs_56_0},
+    {1, arcs_56_1},
+    {1, arcs_56_2},
 };
-static arc arcs_56_0[1] = {
-    {108, 1},
+static arc arcs_57_0[1] = {
+    {109, 1},
 };
-static arc arcs_56_1[2] = {
-    {123, 0},
+static arc arcs_57_1[2] = {
+    {125, 0},
     {0, 1},
 };
-static state states_56[2] = {
-    {1, arcs_56_0},
-    {2, arcs_56_1},
+static state states_57[2] = {
+    {1, arcs_57_0},
+    {2, arcs_57_1},
 };
-static arc arcs_57_0[10] = {
-    {124, 1},
-    {125, 1},
+static arc arcs_58_0[10] = {
     {126, 1},
     {127, 1},
     {128, 1},
     {129, 1},
     {130, 1},
-    {102, 1},
-    {121, 2},
-    {131, 3},
+    {131, 1},
+    {132, 1},
+    {103, 1},
+    {123, 2},
+    {133, 3},
 };
-static arc arcs_57_1[1] = {
+static arc arcs_58_1[1] = {
     {0, 1},
 };
-static arc arcs_57_2[1] = {
-    {102, 1},
+static arc arcs_58_2[1] = {
+    {103, 1},
 };
-static arc arcs_57_3[2] = {
-    {121, 1},
+static arc arcs_58_3[2] = {
+    {123, 1},
     {0, 3},
 };
-static state states_57[4] = {
-    {10, arcs_57_0},
-    {1, arcs_57_1},
-    {1, arcs_57_2},
-    {2, arcs_57_3},
-};
-static arc arcs_58_0[1] = {
-    {33, 1},
-};
-static arc arcs_58_1[1] = {
-    {108, 2},
-};
-static arc arcs_58_2[1] = {
-    {0, 2},
-};
-static state states_58[3] = {
-    {1, arcs_58_0},
+static state states_58[4] = {
+    {10, arcs_58_0},
     {1, arcs_58_1},
     {1, arcs_58_2},
+    {2, arcs_58_3},
 };
 static arc arcs_59_0[1] = {
-    {132, 1},
+    {33, 1},
 };
-static arc arcs_59_1[2] = {
-    {133, 0},
-    {0, 1},
+static arc arcs_59_1[1] = {
+    {109, 2},
 };
-static state states_59[2] = {
+static arc arcs_59_2[1] = {
+    {0, 2},
+};
+static state states_59[3] = {
     {1, arcs_59_0},
-    {2, arcs_59_1},
+    {1, arcs_59_1},
+    {1, arcs_59_2},
 };
 static arc arcs_60_0[1] = {
     {134, 1},
@@ -1361,21 +1369,20 @@ static state states_61[2] = {
 static arc arcs_62_0[1] = {
     {138, 1},
 };
-static arc arcs_62_1[3] = {
+static arc arcs_62_1[2] = {
     {139, 0},
-    {140, 0},
     {0, 1},
 };
 static state states_62[2] = {
     {1, arcs_62_0},
-    {3, arcs_62_1},
+    {2, arcs_62_1},
 };
 static arc arcs_63_0[1] = {
-    {141, 1},
+    {140, 1},
 };
 static arc arcs_63_1[3] = {
+    {141, 0},
     {142, 0},
-    {143, 0},
     {0, 1},
 };
 static state states_63[2] = {
@@ -1383,543 +1390,556 @@ static state states_63[2] = {
     {3, arcs_63_1},
 };
 static arc arcs_64_0[1] = {
-    {144, 1},
+    {143, 1},
 };
-static arc arcs_64_1[6] = {
-    {33, 0},
-    {11, 0},
+static arc arcs_64_1[3] = {
+    {144, 0},
     {145, 0},
-    {146, 0},
-    {147, 0},
     {0, 1},
 };
 static state states_64[2] = {
     {1, arcs_64_0},
-    {6, arcs_64_1},
+    {3, arcs_64_1},
 };
-static arc arcs_65_0[4] = {
-    {142, 1},
-    {143, 1},
-    {148, 1},
-    {149, 2},
+static arc arcs_65_0[1] = {
+    {146, 1},
 };
-static arc arcs_65_1[1] = {
-    {144, 2},
+static arc arcs_65_1[6] = {
+    {33, 0},
+    {11, 0},
+    {147, 0},
+    {148, 0},
+    {149, 0},
+    {0, 1},
 };
-static arc arcs_65_2[1] = {
+static state states_65[2] = {
+    {1, arcs_65_0},
+    {6, arcs_65_1},
+};
+static arc arcs_66_0[4] = {
+    {144, 1},
+    {145, 1},
+    {150, 1},
+    {151, 2},
+};
+static arc arcs_66_1[1] = {
+    {146, 2},
+};
+static arc arcs_66_2[1] = {
     {0, 2},
 };
-static state states_65[3] = {
-    {4, arcs_65_0},
-    {1, arcs_65_1},
-    {1, arcs_65_2},
+static state states_66[3] = {
+    {4, arcs_66_0},
+    {1, arcs_66_1},
+    {1, arcs_66_2},
 };
-static arc arcs_66_0[1] = {
-    {150, 1},
+static arc arcs_67_0[1] = {
+    {152, 1},
 };
-static arc arcs_66_1[2] = {
+static arc arcs_67_1[2] = {
     {34, 2},
     {0, 1},
 };
-static arc arcs_66_2[1] = {
-    {144, 3},
+static arc arcs_67_2[1] = {
+    {146, 3},
 };
-static arc arcs_66_3[1] = {
+static arc arcs_67_3[1] = {
     {0, 3},
 };
-static state states_66[4] = {
-    {1, arcs_66_0},
-    {2, arcs_66_1},
-    {1, arcs_66_2},
-    {1, arcs_66_3},
+static state states_67[4] = {
+    {1, arcs_67_0},
+    {2, arcs_67_1},
+    {1, arcs_67_2},
+    {1, arcs_67_3},
 };
-static arc arcs_67_0[2] = {
-    {151, 1},
-    {152, 2},
+static arc arcs_68_0[2] = {
+    {153, 1},
+    {154, 2},
 };
-static arc arcs_67_1[1] = {
-    {152, 2},
+static arc arcs_68_1[1] = {
+    {154, 2},
 };
-static arc arcs_67_2[2] = {
-    {153, 2},
+static arc arcs_68_2[2] = {
+    {155, 2},
     {0, 2},
 };
-static state states_67[3] = {
-    {2, arcs_67_0},
-    {1, arcs_67_1},
-    {2, arcs_67_2},
+static state states_68[3] = {
+    {2, arcs_68_0},
+    {1, arcs_68_1},
+    {2, arcs_68_2},
 };
-static arc arcs_68_0[10] = {
+static arc arcs_69_0[10] = {
     {13, 1},
-    {155, 2},
-    {157, 3},
+    {157, 2},
+    {159, 3},
     {23, 4},
-    {160, 4},
-    {161, 5},
-    {83, 4},
     {162, 4},
-    {163, 4},
+    {163, 5},
+    {83, 4},
     {164, 4},
+    {165, 4},
+    {166, 4},
 };
-static arc arcs_68_1[3] = {
+static arc arcs_69_1[3] = {
     {50, 6},
-    {154, 6},
+    {156, 6},
     {15, 4},
 };
-static arc arcs_68_2[2] = {
-    {154, 7},
-    {156, 4},
+static arc arcs_69_2[2] = {
+    {156, 7},
+    {158, 4},
 };
-static arc arcs_68_3[2] = {
-    {158, 8},
-    {159, 4},
+static arc arcs_69_3[2] = {
+    {160, 8},
+    {161, 4},
 };
-static arc arcs_68_4[1] = {
+static arc arcs_69_4[1] = {
     {0, 4},
 };
-static arc arcs_68_5[2] = {
-    {161, 5},
+static arc arcs_69_5[2] = {
+    {163, 5},
     {0, 5},
 };
-static arc arcs_68_6[1] = {
+static arc arcs_69_6[1] = {
     {15, 4},
 };
-static arc arcs_68_7[1] = {
-    {156, 4},
+static arc arcs_69_7[1] = {
+    {158, 4},
 };
-static arc arcs_68_8[1] = {
-    {159, 4},
+static arc arcs_69_8[1] = {
+    {161, 4},
 };
-static state states_68[9] = {
-    {10, arcs_68_0},
-    {3, arcs_68_1},
-    {2, arcs_68_2},
-    {2, arcs_68_3},
-    {1, arcs_68_4},
-    {2, arcs_68_5},
-    {1, arcs_68_6},
-    {1, arcs_68_7},
-    {1, arcs_68_8},
-};
-static arc arcs_69_0[2] = {
-    {26, 1},
+static state states_69[9] = {
+    {10, arcs_69_0},
+    {3, arcs_69_1},
+    {2, arcs_69_2},
+    {2, arcs_69_3},
+    {1, arcs_69_4},
+    {2, arcs_69_5},
+    {1, arcs_69_6},
+    {1, arcs_69_7},
+    {1, arcs_69_8},
+};
+static arc arcs_70_0[2] = {
+    {98, 1},
     {51, 1},
 };
-static arc arcs_69_1[3] = {
-    {165, 2},
+static arc arcs_70_1[3] = {
+    {167, 2},
     {32, 3},
     {0, 1},
 };
-static arc arcs_69_2[1] = {
+static arc arcs_70_2[1] = {
     {0, 2},
 };
-static arc arcs_69_3[3] = {
-    {26, 4},
+static arc arcs_70_3[3] = {
+    {98, 4},
     {51, 4},
     {0, 3},
 };
-static arc arcs_69_4[2] = {
+static arc arcs_70_4[2] = {
     {32, 3},
     {0, 4},
 };
-static state states_69[5] = {
-    {2, arcs_69_0},
-    {3, arcs_69_1},
-    {1, arcs_69_2},
-    {3, arcs_69_3},
-    {2, arcs_69_4},
+static state states_70[5] = {
+    {2, arcs_70_0},
+    {3, arcs_70_1},
+    {1, arcs_70_2},
+    {3, arcs_70_3},
+    {2, arcs_70_4},
 };
-static arc arcs_70_0[3] = {
+static arc arcs_71_0[3] = {
     {13, 1},
-    {155, 2},
+    {157, 2},
     {82, 3},
 };
-static arc arcs_70_1[2] = {
+static arc arcs_71_1[2] = {
     {14, 4},
     {15, 5},
 };
-static arc arcs_70_2[1] = {
-    {166, 6},
+static arc arcs_71_2[1] = {
+    {168, 6},
 };
-static arc arcs_70_3[1] = {
+static arc arcs_71_3[1] = {
     {23, 5},
 };
-static arc arcs_70_4[1] = {
+static arc arcs_71_4[1] = {
     {15, 5},
 };
-static arc arcs_70_5[1] = {
+static arc arcs_71_5[1] = {
     {0, 5},
 };
-static arc arcs_70_6[1] = {
-    {156, 5},
+static arc arcs_71_6[1] = {
+    {158, 5},
 };
-static state states_70[7] = {
-    {3, arcs_70_0},
-    {2, arcs_70_1},
-    {1, arcs_70_2},
-    {1, arcs_70_3},
-    {1, arcs_70_4},
-    {1, arcs_70_5},
-    {1, arcs_70_6},
+static state states_71[7] = {
+    {3, arcs_71_0},
+    {2, arcs_71_1},
+    {1, arcs_71_2},
+    {1, arcs_71_3},
+    {1, arcs_71_4},
+    {1, arcs_71_5},
+    {1, arcs_71_6},
 };
-static arc arcs_71_0[1] = {
-    {167, 1},
+static arc arcs_72_0[1] = {
+    {169, 1},
 };
-static arc arcs_71_1[2] = {
+static arc arcs_72_1[2] = {
     {32, 2},
     {0, 1},
 };
-static arc arcs_71_2[2] = {
-    {167, 1},
+static arc arcs_72_2[2] = {
+    {169, 1},
     {0, 2},
 };
-static state states_71[3] = {
-    {1, arcs_71_0},
-    {2, arcs_71_1},
-    {2, arcs_71_2},
+static state states_72[3] = {
+    {1, arcs_72_0},
+    {2, arcs_72_1},
+    {2, arcs_72_2},
 };
-static arc arcs_72_0[2] = {
+static arc arcs_73_0[2] = {
     {26, 1},
     {27, 2},
 };
-static arc arcs_72_1[2] = {
+static arc arcs_73_1[2] = {
     {27, 2},
     {0, 1},
 };
-static arc arcs_72_2[3] = {
+static arc arcs_73_2[3] = {
     {26, 3},
-    {168, 4},
+    {170, 4},
     {0, 2},
 };
-static arc arcs_72_3[2] = {
-    {168, 4},
+static arc arcs_73_3[2] = {
+    {170, 4},
     {0, 3},
 };
-static arc arcs_72_4[1] = {
+static arc arcs_73_4[1] = {
     {0, 4},
 };
-static state states_72[5] = {
-    {2, arcs_72_0},
-    {2, arcs_72_1},
-    {3, arcs_72_2},
-    {2, arcs_72_3},
-    {1, arcs_72_4},
+static state states_73[5] = {
+    {2, arcs_73_0},
+    {2, arcs_73_1},
+    {3, arcs_73_2},
+    {2, arcs_73_3},
+    {1, arcs_73_4},
 };
-static arc arcs_73_0[1] = {
+static arc arcs_74_0[1] = {
     {27, 1},
 };
-static arc arcs_73_1[2] = {
+static arc arcs_74_1[2] = {
     {26, 2},
     {0, 1},
 };
-static arc arcs_73_2[1] = {
+static arc arcs_74_2[1] = {
     {0, 2},
 };
-static state states_73[3] = {
-    {1, arcs_73_0},
-    {2, arcs_73_1},
-    {1, arcs_73_2},
+static state states_74[3] = {
+    {1, arcs_74_0},
+    {2, arcs_74_1},
+    {1, arcs_74_2},
 };
-static arc arcs_74_0[2] = {
-    {108, 1},
+static arc arcs_75_0[2] = {
+    {109, 1},
     {51, 1},
 };
-static arc arcs_74_1[2] = {
+static arc arcs_75_1[2] = {
     {32, 2},
     {0, 1},
 };
-static arc arcs_74_2[3] = {
-    {108, 1},
+static arc arcs_75_2[3] = {
+    {109, 1},
     {51, 1},
     {0, 2},
 };
-static state states_74[3] = {
-    {2, arcs_74_0},
-    {2, arcs_74_1},
-    {3, arcs_74_2},
+static state states_75[3] = {
+    {2, arcs_75_0},
+    {2, arcs_75_1},
+    {3, arcs_75_2},
 };
-static arc arcs_75_0[1] = {
+static arc arcs_76_0[1] = {
     {26, 1},
 };
-static arc arcs_75_1[2] = {
+static arc arcs_76_1[2] = {
     {32, 2},
     {0, 1},
 };
-static arc arcs_75_2[2] = {
+static arc arcs_76_2[2] = {
     {26, 1},
     {0, 2},
 };
-static state states_75[3] = {
-    {1, arcs_75_0},
-    {2, arcs_75_1},
-    {2, arcs_75_2},
+static state states_76[3] = {
+    {1, arcs_76_0},
+    {2, arcs_76_1},
+    {2, arcs_76_2},
 };
-static arc arcs_76_0[3] = {
+static arc arcs_77_0[3] = {
     {26, 1},
     {34, 2},
     {51, 3},
 };
-static arc arcs_76_1[4] = {
+static arc arcs_77_1[4] = {
     {27, 4},
-    {165, 5},
+    {167, 5},
     {32, 6},
     {0, 1},
 };
-static arc arcs_76_2[1] = {
-    {108, 7},
+static arc arcs_77_2[1] = {
+    {109, 7},
 };
-static arc arcs_76_3[3] = {
-    {165, 5},
+static arc arcs_77_3[3] = {
+    {167, 5},
     {32, 6},
     {0, 3},
 };
-static arc arcs_76_4[1] = {
+static arc arcs_77_4[1] = {
     {26, 7},
 };
-static arc arcs_76_5[1] = {
+static arc arcs_77_5[1] = {
     {0, 5},
 };
-static arc arcs_76_6[3] = {
+static arc arcs_77_6[3] = {
     {26, 8},
     {51, 8},
     {0, 6},
 };
-static arc arcs_76_7[3] = {
-    {165, 5},
+static arc arcs_77_7[3] = {
+    {167, 5},
     {32, 9},
     {0, 7},
 };
-static arc arcs_76_8[2] = {
+static arc arcs_77_8[2] = {
     {32, 6},
     {0, 8},
 };
-static arc arcs_76_9[3] = {
+static arc arcs_77_9[3] = {
     {26, 10},
     {34, 11},
     {0, 9},
 };
-static arc arcs_76_10[1] = {
+static arc arcs_77_10[1] = {
     {27, 12},
 };
-static arc arcs_76_11[1] = {
-    {108, 13},
+static arc arcs_77_11[1] = {
+    {109, 13},
 };
-static arc arcs_76_12[1] = {
+static arc arcs_77_12[1] = {
     {26, 13},
 };
-static arc arcs_76_13[2] = {
+static arc arcs_77_13[2] = {
     {32, 9},
     {0, 13},
 };
-static state states_76[14] = {
-    {3, arcs_76_0},
-    {4, arcs_76_1},
-    {1, arcs_76_2},
-    {3, arcs_76_3},
-    {1, arcs_76_4},
-    {1, arcs_76_5},
-    {3, arcs_76_6},
-    {3, arcs_76_7},
-    {2, arcs_76_8},
-    {3, arcs_76_9},
-    {1, arcs_76_10},
-    {1, arcs_76_11},
-    {1, arcs_76_12},
-    {2, arcs_76_13},
-};
-static arc arcs_77_0[1] = {
-    {169, 1},
+static state states_77[14] = {
+    {3, arcs_77_0},
+    {4, arcs_77_1},
+    {1, arcs_77_2},
+    {3, arcs_77_3},
+    {1, arcs_77_4},
+    {1, arcs_77_5},
+    {3, arcs_77_6},
+    {3, arcs_77_7},
+    {2, arcs_77_8},
+    {3, arcs_77_9},
+    {1, arcs_77_10},
+    {1, arcs_77_11},
+    {1, arcs_77_12},
+    {2, arcs_77_13},
 };
-static arc arcs_77_1[1] = {
+static arc arcs_78_0[1] = {
+    {171, 1},
+};
+static arc arcs_78_1[1] = {
     {23, 2},
 };
-static arc arcs_77_2[2] = {
+static arc arcs_78_2[2] = {
     {13, 3},
     {27, 4},
 };
-static arc arcs_77_3[2] = {
+static arc arcs_78_3[2] = {
     {14, 5},
     {15, 6},
 };
-static arc arcs_77_4[1] = {
+static arc arcs_78_4[1] = {
     {28, 7},
 };
-static arc arcs_77_5[1] = {
+static arc arcs_78_5[1] = {
     {15, 6},
 };
-static arc arcs_77_6[1] = {
+static arc arcs_78_6[1] = {
     {27, 4},
 };
-static arc arcs_77_7[1] = {
+static arc arcs_78_7[1] = {
     {0, 7},
 };
-static state states_77[8] = {
-    {1, arcs_77_0},
-    {1, arcs_77_1},
-    {2, arcs_77_2},
-    {2, arcs_77_3},
-    {1, arcs_77_4},
-    {1, arcs_77_5},
-    {1, arcs_77_6},
-    {1, arcs_77_7},
+static state states_78[8] = {
+    {1, arcs_78_0},
+    {1, arcs_78_1},
+    {2, arcs_78_2},
+    {2, arcs_78_3},
+    {1, arcs_78_4},
+    {1, arcs_78_5},
+    {1, arcs_78_6},
+    {1, arcs_78_7},
 };
-static arc arcs_78_0[1] = {
-    {170, 1},
+static arc arcs_79_0[1] = {
+    {172, 1},
 };
-static arc arcs_78_1[2] = {
+static arc arcs_79_1[2] = {
     {32, 2},
     {0, 1},
 };
-static arc arcs_78_2[2] = {
-    {170, 1},
+static arc arcs_79_2[2] = {
+    {172, 1},
     {0, 2},
 };
-static state states_78[3] = {
-    {1, arcs_78_0},
-    {2, arcs_78_1},
-    {2, arcs_78_2},
+static state states_79[3] = {
+    {1, arcs_79_0},
+    {2, arcs_79_1},
+    {2, arcs_79_2},
 };
-static arc arcs_79_0[3] = {
+static arc arcs_80_0[3] = {
     {26, 1},
     {34, 2},
     {33, 2},
 };
-static arc arcs_79_1[3] = {
-    {165, 3},
+static arc arcs_80_1[4] = {
+    {167, 3},
+    {113, 2},
     {31, 2},
     {0, 1},
 };
-static arc arcs_79_2[1] = {
+static arc arcs_80_2[1] = {
     {26, 3},
 };
-static arc arcs_79_3[1] = {
+static arc arcs_80_3[1] = {
     {0, 3},
 };
-static state states_79[4] = {
-    {3, arcs_79_0},
-    {3, arcs_79_1},
-    {1, arcs_79_2},
-    {1, arcs_79_3},
+static state states_80[4] = {
+    {3, arcs_80_0},
+    {4, arcs_80_1},
+    {1, arcs_80_2},
+    {1, arcs_80_3},
 };
-static arc arcs_80_0[2] = {
-    {165, 1},
-    {172, 1},
+static arc arcs_81_0[2] = {
+    {167, 1},
+    {174, 1},
 };
-static arc arcs_80_1[1] = {
+static arc arcs_81_1[1] = {
     {0, 1},
 };
-static state states_80[2] = {
-    {2, arcs_80_0},
-    {1, arcs_80_1},
+static state states_81[2] = {
+    {2, arcs_81_0},
+    {1, arcs_81_1},
 };
-static arc arcs_81_0[1] = {
-    {101, 1},
+static arc arcs_82_0[1] = {
+    {102, 1},
 };
-static arc arcs_81_1[1] = {
+static arc arcs_82_1[1] = {
     {66, 2},
 };
-static arc arcs_81_2[1] = {
-    {102, 3},
+static arc arcs_82_2[1] = {
+    {103, 3},
 };
-static arc arcs_81_3[1] = {
-    {112, 4},
+static arc arcs_82_3[1] = {
+    {114, 4},
 };
-static arc arcs_81_4[2] = {
-    {171, 5},
+static arc arcs_82_4[2] = {
+    {173, 5},
     {0, 4},
 };
-static arc arcs_81_5[1] = {
+static arc arcs_82_5[1] = {
     {0, 5},
 };
-static state states_81[6] = {
-    {1, arcs_81_0},
-    {1, arcs_81_1},
-    {1, arcs_81_2},
-    {1, arcs_81_3},
-    {2, arcs_81_4},
-    {1, arcs_81_5},
+static state states_82[6] = {
+    {1, arcs_82_0},
+    {1, arcs_82_1},
+    {1, arcs_82_2},
+    {1, arcs_82_3},
+    {2, arcs_82_4},
+    {1, arcs_82_5},
 };
-static arc arcs_82_0[2] = {
+static arc arcs_83_0[2] = {
     {21, 1},
-    {173, 2},
+    {175, 2},
 };
-static arc arcs_82_1[1] = {
-    {173, 2},
+static arc arcs_83_1[1] = {
+    {175, 2},
 };
-static arc arcs_82_2[1] = {
+static arc arcs_83_2[1] = {
     {0, 2},
 };
-static state states_82[3] = {
-    {2, arcs_82_0},
-    {1, arcs_82_1},
-    {1, arcs_82_2},
+static state states_83[3] = {
+    {2, arcs_83_0},
+    {1, arcs_83_1},
+    {1, arcs_83_2},
 };
-static arc arcs_83_0[1] = {
+static arc arcs_84_0[1] = {
     {97, 1},
 };
-static arc arcs_83_1[1] = {
-    {114, 2},
+static arc arcs_84_1[1] = {
+    {116, 2},
 };
-static arc arcs_83_2[2] = {
-    {171, 3},
+static arc arcs_84_2[2] = {
+    {173, 3},
     {0, 2},
 };
-static arc arcs_83_3[1] = {
+static arc arcs_84_3[1] = {
     {0, 3},
 };
-static state states_83[4] = {
-    {1, arcs_83_0},
-    {1, arcs_83_1},
-    {2, arcs_83_2},
-    {1, arcs_83_3},
+static state states_84[4] = {
+    {1, arcs_84_0},
+    {1, arcs_84_1},
+    {2, arcs_84_2},
+    {1, arcs_84_3},
 };
-static arc arcs_84_0[1] = {
+static arc arcs_85_0[1] = {
     {23, 1},
 };
-static arc arcs_84_1[1] = {
+static arc arcs_85_1[1] = {
     {0, 1},
 };
-static state states_84[2] = {
-    {1, arcs_84_0},
-    {1, arcs_84_1},
+static state states_85[2] = {
+    {1, arcs_85_0},
+    {1, arcs_85_1},
 };
-static arc arcs_85_0[1] = {
-    {175, 1},
+static arc arcs_86_0[1] = {
+    {177, 1},
 };
-static arc arcs_85_1[2] = {
-    {176, 2},
+static arc arcs_86_1[2] = {
+    {178, 2},
     {0, 1},
 };
-static arc arcs_85_2[1] = {
+static arc arcs_86_2[1] = {
     {0, 2},
 };
-static state states_85[3] = {
-    {1, arcs_85_0},
-    {2, arcs_85_1},
-    {1, arcs_85_2},
+static state states_86[3] = {
+    {1, arcs_86_0},
+    {2, arcs_86_1},
+    {1, arcs_86_2},
 };
-static arc arcs_86_0[2] = {
+static arc arcs_87_0[2] = {
     {77, 1},
     {47, 2},
 };
-static arc arcs_86_1[1] = {
+static arc arcs_87_1[1] = {
     {26, 2},
 };
-static arc arcs_86_2[1] = {
+static arc arcs_87_2[1] = {
     {0, 2},
 };
-static state states_86[3] = {
-    {2, arcs_86_0},
-    {1, arcs_86_1},
-    {1, arcs_86_2},
+static state states_87[3] = {
+    {2, arcs_87_0},
+    {1, arcs_87_1},
+    {1, arcs_87_2},
 };
-static dfa dfas[87] = {
+static dfa dfas[88] = {
     {256, "single_input", 0, 3, states_0,
-     "\004\050\340\000\002\000\000\000\012\076\011\007\262\004\020\002\000\300\220\050\037\202\000"},
+     "\004\050\340\000\002\000\000\000\012\076\011\007\142\011\100\010\000\000\103\242\174\010\002"},
     {257, "file_input", 0, 2, states_1,
-     "\204\050\340\000\002\000\000\000\012\076\011\007\262\004\020\002\000\300\220\050\037\202\000"},
+     "\204\050\340\000\002\000\000\000\012\076\011\007\142\011\100\010\000\000\103\242\174\010\002"},
     {258, "eval_input", 0, 3, states_2,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
     {259, "decorator", 0, 7, states_3,
      "\000\010\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {260, "decorators", 0, 2, states_4,
@@ -1941,17 +1961,17 @@ static dfa dfas[87] = {
     {268, "vfpdef", 0, 2, states_12,
      "\000\000\200\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {269, "stmt", 0, 2, states_13,
-     "\000\050\340\000\002\000\000\000\012\076\011\007\262\004\020\002\000\300\220\050\037\202\000"},
+     "\000\050\340\000\002\000\000\000\012\076\011\007\142\011\100\010\000\000\103\242\174\010\002"},
     {270, "simple_stmt", 0, 4, states_14,
-     "\000\040\200\000\002\000\000\000\012\076\011\007\000\000\020\002\000\300\220\050\037\200\000"},
+     "\000\040\200\000\002\000\000\000\012\076\011\007\000\000\100\010\000\000\103\242\174\000\002"},
     {271, "small_stmt", 0, 2, states_15,
-     "\000\040\200\000\002\000\000\000\012\076\011\007\000\000\020\002\000\300\220\050\037\200\000"},
+     "\000\040\200\000\002\000\000\000\012\076\011\007\000\000\100\010\000\000\103\242\174\000\002"},
     {272, "expr_stmt", 0, 6, states_16,
-     "\000\040\200\000\002\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
+     "\000\040\200\000\002\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
     {273, "annassign", 0, 5, states_17,
      "\000\000\000\010\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {274, "testlist_star_expr", 0, 3, states_18,
-     "\000\040\200\000\002\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
+     "\000\040\200\000\002\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
     {275, "augassign", 0, 2, states_19,
      "\000\000\000\000\000\000\360\377\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {276, "del_stmt", 0, 3, states_20,
@@ -1959,7 +1979,7 @@ static dfa dfas[87] = {
     {277, "pass_stmt", 0, 2, states_21,
      "\000\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {278, "flow_stmt", 0, 2, states_22,
-     "\000\000\000\000\000\000\000\000\000\036\000\000\000\000\000\000\000\000\000\000\000\200\000"},
+     "\000\000\000\000\000\000\000\000\000\036\000\000\000\000\000\000\000\000\000\000\000\000\002"},
     {279, "break_stmt", 0, 2, states_23,
      "\000\000\000\000\000\000\000\000\000\002\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {280, "continue_stmt", 0, 2, states_24,
@@ -1967,7 +1987,7 @@ static dfa dfas[87] = {
     {281, "return_stmt", 0, 3, states_25,
      "\000\000\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {282, "yield_stmt", 0, 2, states_26,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\200\000"},
+     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\002"},
     {283, "raise_stmt", 0, 5, states_27,
      "\000\000\000\000\000\000\000\000\000\020\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {284, "import_stmt", 0, 2, states_28,
@@ -1993,103 +2013,105 @@ static dfa dfas[87] = {
     {294, "assert_stmt", 0, 5, states_38,
      "\000\000\000\000\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000\000\000\000\000"},
     {295, "compound_stmt", 0, 2, states_39,
-     "\000\010\140\000\000\000\000\000\000\000\000\000\262\004\000\000\000\000\000\000\000\002\000"},
+     "\000\010\140\000\000\000\000\000\000\000\000\000\142\011\000\000\000\000\000\000\000\010\000"},
     {296, "async_stmt", 0, 3, states_40,
      "\000\000\040\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
     {297, "if_stmt", 0, 8, states_41,
      "\000\000\000\000\000\000\000\000\000\000\000\000\002\000\000\000\000\000\000\000\000\000\000"},
     {298, "while_stmt", 0, 8, states_42,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\020\000\000\000\000\000\000\000\000\000\000"},
-    {299, "for_stmt", 0, 10, states_43,
      "\000\000\000\000\000\000\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\000\000"},
+    {299, "for_stmt", 0, 10, states_43,
+     "\000\000\000\000\000\000\000\000\000\000\000\000\100\000\000\000\000\000\000\000\000\000\000"},
     {300, "try_stmt", 0, 13, states_44,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\200\000\000\000\000\000\000\000\000\000\000"},
+     "\000\000\000\000\000\000\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\000\000"},
     {301, "with_stmt", 0, 5, states_45,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000\000\000"},
+     "\000\000\000\000\000\000\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\000\000"},
     {302, "with_item", 0, 4, states_46,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
     {303, "except_clause", 0, 5, states_47,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\000"},
+     "\000\000\000\000\000\000\000\000\000\000\000\000\000\100\000\000\000\000\000\000\000\000\000"},
     {304, "suite", 0, 5, states_48,
-     "\004\040\200\000\002\000\000\000\012\076\011\007\000\000\020\002\000\300\220\050\037\200\000"},
-    {305, "test", 0, 6, states_49,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {306, "test_nocond", 0, 2, states_50,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {307, "lambdef", 0, 5, states_51,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\020\000\000\000\000\000\000\000\000"},
-    {308, "lambdef_nocond", 0, 5, states_52,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\020\000\000\000\000\000\000\000\000"},
-    {309, "or_test", 0, 2, states_53,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\002\000\300\220\050\037\000\000"},
-    {310, "and_test", 0, 2, states_54,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\002\000\300\220\050\037\000\000"},
-    {311, "not_test", 0, 3, states_55,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\002\000\300\220\050\037\000\000"},
-    {312, "comparison", 0, 2, states_56,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {313, "comp_op", 0, 4, states_57,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\100\000\000\362\017\000\000\000\000\000\000"},
-    {314, "star_expr", 0, 3, states_58,
+     "\004\040\200\000\002\000\000\000\012\076\011\007\000\000\100\010\000\000\103\242\174\000\002"},
+    {305, "namedexpr_test", 0, 4, states_49,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {306, "test", 0, 6, states_50,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {307, "test_nocond", 0, 2, states_51,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {308, "lambdef", 0, 5, states_52,
+     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\100\000\000\000\000\000\000\000\000"},
+    {309, "lambdef_nocond", 0, 5, states_53,
+     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\100\000\000\000\000\000\000\000\000"},
+    {310, "or_test", 0, 2, states_54,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\010\000\000\103\242\174\000\000"},
+    {311, "and_test", 0, 2, states_55,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\010\000\000\103\242\174\000\000"},
+    {312, "not_test", 0, 3, states_56,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\010\000\000\103\242\174\000\000"},
+    {313, "comparison", 0, 2, states_57,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {314, "comp_op", 0, 4, states_58,
+     "\000\000\000\000\000\000\000\000\000\000\000\000\200\000\000\310\077\000\000\000\000\000\000"},
+    {315, "star_expr", 0, 3, states_59,
      "\000\000\000\000\002\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
-    {315, "expr", 0, 2, states_59,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {316, "xor_expr", 0, 2, states_60,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {317, "and_expr", 0, 2, states_61,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {318, "shift_expr", 0, 2, states_62,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {319, "arith_expr", 0, 2, states_63,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {320, "term", 0, 2, states_64,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {321, "factor", 0, 3, states_65,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {322, "power", 0, 4, states_66,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\200\050\037\000\000"},
-    {323, "atom_expr", 0, 3, states_67,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\200\050\037\000\000"},
-    {324, "atom", 0, 9, states_68,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\000\050\037\000\000"},
-    {325, "testlist_comp", 0, 5, states_69,
-     "\000\040\200\000\002\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {326, "trailer", 0, 7, states_70,
-     "\000\040\000\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000\000\010\000\000\000"},
-    {327, "subscriptlist", 0, 3, states_71,
-     "\000\040\200\010\000\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {328, "subscript", 0, 5, states_72,
-     "\000\040\200\010\000\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {329, "sliceop", 0, 3, states_73,
+    {316, "expr", 0, 2, states_60,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {317, "xor_expr", 0, 2, states_61,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {318, "and_expr", 0, 2, states_62,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {319, "shift_expr", 0, 2, states_63,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {320, "arith_expr", 0, 2, states_64,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {321, "term", 0, 2, states_65,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {322, "factor", 0, 3, states_66,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {323, "power", 0, 4, states_67,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\000\242\174\000\000"},
+    {324, "atom_expr", 0, 3, states_68,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\000\242\174\000\000"},
+    {325, "atom", 0, 9, states_69,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\000\240\174\000\000"},
+    {326, "testlist_comp", 0, 5, states_70,
+     "\000\040\200\000\002\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {327, "trailer", 0, 7, states_71,
+     "\000\040\000\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000\000\040\000\000\000"},
+    {328, "subscriptlist", 0, 3, states_72,
+     "\000\040\200\010\000\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {329, "subscript", 0, 5, states_73,
+     "\000\040\200\010\000\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {330, "sliceop", 0, 3, states_74,
      "\000\000\000\010\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
-    {330, "exprlist", 0, 3, states_74,
-     "\000\040\200\000\002\000\000\000\000\000\010\000\000\000\000\000\000\300\220\050\037\000\000"},
-    {331, "testlist", 0, 3, states_75,
-     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {332, "dictorsetmaker", 0, 14, states_76,
-     "\000\040\200\000\006\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {333, "classdef", 0, 8, states_77,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\002\000"},
-    {334, "arglist", 0, 3, states_78,
-     "\000\040\200\000\006\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {335, "argument", 0, 4, states_79,
-     "\000\040\200\000\006\000\000\000\000\000\010\000\000\000\020\002\000\300\220\050\037\000\000"},
-    {336, "comp_iter", 0, 2, states_80,
-     "\000\000\040\000\000\000\000\000\000\000\000\000\042\000\000\000\000\000\000\000\000\000\000"},
-    {337, "sync_comp_for", 0, 6, states_81,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\000\000"},
-    {338, "comp_for", 0, 3, states_82,
-     "\000\000\040\000\000\000\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\000\000"},
-    {339, "comp_if", 0, 4, states_83,
+    {331, "exprlist", 0, 3, states_75,
+     "\000\040\200\000\002\000\000\000\000\000\010\000\000\000\000\000\000\000\103\242\174\000\000"},
+    {332, "testlist", 0, 3, states_76,
+     "\000\040\200\000\000\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {333, "dictorsetmaker", 0, 14, states_77,
+     "\000\040\200\000\006\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {334, "classdef", 0, 8, states_78,
+     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\010\000"},
+    {335, "arglist", 0, 3, states_79,
+     "\000\040\200\000\006\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {336, "argument", 0, 4, states_80,
+     "\000\040\200\000\006\000\000\000\000\000\010\000\000\000\100\010\000\000\103\242\174\000\000"},
+    {337, "comp_iter", 0, 2, states_81,
+     "\000\000\040\000\000\000\000\000\000\000\000\000\102\000\000\000\000\000\000\000\000\000\000"},
+    {338, "sync_comp_for", 0, 6, states_82,
+     "\000\000\000\000\000\000\000\000\000\000\000\000\100\000\000\000\000\000\000\000\000\000\000"},
+    {339, "comp_for", 0, 3, states_83,
+     "\000\000\040\000\000\000\000\000\000\000\000\000\100\000\000\000\000\000\000\000\000\000\000"},
+    {340, "comp_if", 0, 4, states_84,
      "\000\000\000\000\000\000\000\000\000\000\000\000\002\000\000\000\000\000\000\000\000\000\000"},
-    {340, "encoding_decl", 0, 2, states_84,
+    {341, "encoding_decl", 0, 2, states_85,
      "\000\000\200\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
-    {341, "yield_expr", 0, 3, states_85,
-     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\200\000"},
-    {342, "yield_arg", 0, 3, states_86,
-     "\000\040\200\000\002\000\000\000\000\040\010\000\000\000\020\002\000\300\220\050\037\000\000"},
+    {342, "yield_expr", 0, 3, states_86,
+     "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\002"},
+    {343, "yield_arg", 0, 3, states_87,
+     "\000\040\200\000\002\000\000\000\000\040\010\000\000\000\100\010\000\000\103\242\174\000\000"},
 };
-static label labels[177] = {
+static label labels[179] = {
     {0, "EMPTY"},
     {256, 0},
     {4, 0},
@@ -2099,16 +2121,16 @@ static label labels[177] = {
     {269, 0},
     {0, 0},
     {258, 0},
-    {331, 0},
+    {332, 0},
     {259, 0},
     {49, 0},
     {291, 0},
     {7, 0},
-    {334, 0},
+    {335, 0},
     {8, 0},
     {260, 0},
     {261, 0},
-    {333, 0},
+    {334, 0},
     {263, 0},
     {262, 0},
     {1, "async"},
@@ -2116,7 +2138,7 @@ static label labels[177] = {
     {1, 0},
     {264, 0},
     {51, 0},
-    {305, 0},
+    {306, 0},
     {11, 0},
     {304, 0},
     {265, 0},
@@ -2140,8 +2162,8 @@ static label labels[177] = {
     {274, 0},
     {273, 0},
     {275, 0},
-    {341, 0},
-    {314, 0},
+    {342, 0},
+    {315, 0},
     {36, 0},
     {37, 0},
     {38, 0},
@@ -2156,7 +2178,7 @@ static label labels[177] = {
     {46, 0},
     {48, 0},
     {1, "del"},
-    {330, 0},
+    {331, 0},
     {1, "pass"},
     {279, 0},
     {280, 0},
@@ -2188,6 +2210,7 @@ static label labels[177] = {
     {301, 0},
     {296, 0},
     {1, "if"},
+    {305, 0},
     {1, "elif"},
     {1, "else"},
     {1, "while"},
@@ -2198,22 +2221,23 @@ static label labels[177] = {
     {1, "finally"},
     {1, "with"},
     {302, 0},
-    {315, 0},
+    {316, 0},
     {1, "except"},
     {5, 0},
     {6, 0},
-    {309, 0},
-    {307, 0},
-    {306, 0},
+    {53, 0},
+    {310, 0},
     {308, 0},
+    {307, 0},
+    {309, 0},
     {1, "lambda"},
-    {310, 0},
-    {1, "or"},
     {311, 0},
+    {1, "or"},
+    {312, 0},
     {1, "and"},
     {1, "not"},
-    {312, 0},
     {313, 0},
+    {314, 0},
     {20, 0},
     {21, 0},
     {27, 0},
@@ -2222,55 +2246,55 @@ static label labels[177] = {
     {28, 0},
     {28, 0},
     {1, "is"},
-    {316, 0},
-    {18, 0},
     {317, 0},
-    {32, 0},
+    {18, 0},
     {318, 0},
-    {19, 0},
+    {32, 0},
     {319, 0},
+    {19, 0},
+    {320, 0},
     {33, 0},
     {34, 0},
-    {320, 0},
+    {321, 0},
     {14, 0},
     {15, 0},
-    {321, 0},
+    {322, 0},
     {17, 0},
     {24, 0},
     {47, 0},
     {31, 0},
-    {322, 0},
     {323, 0},
-    {1, "await"},
     {324, 0},
-    {326, 0},
+    {1, "await"},
     {325, 0},
+    {327, 0},
+    {326, 0},
     {9, 0},
     {10, 0},
     {25, 0},
-    {332, 0},
+    {333, 0},
     {26, 0},
     {2, 0},
     {3, 0},
     {1, "None"},
     {1, "True"},
     {1, "False"},
-    {338, 0},
-    {327, 0},
+    {339, 0},
     {328, 0},
     {329, 0},
+    {330, 0},
     {1, "class"},
-    {335, 0},
     {336, 0},
-    {339, 0},
     {337, 0},
     {340, 0},
+    {338, 0},
+    {341, 0},
     {1, "yield"},
-    {342, 0},
+    {343, 0},
 };
 grammar _PyParser_Grammar = {
-    87,
+    88,
     dfas,
-    {177, labels},
+    {179, labels},
     256
 };
diff --git a/Python/symtable.c b/Python/symtable.c
index 677b604..879e19a 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -31,6 +31,9 @@
 
 #define IMPORT_STAR_WARNING "import * only allowed at module level"
 
+#define NAMED_EXPR_COMP_IN_CLASS \
+"named expression within a comprehension cannot be used in a class body"
+
 static PySTEntryObject *
 ste_new(struct symtable *st, identifier name, _Py_block_ty block,
         void *key, int lineno, int col_offset)
@@ -75,6 +78,7 @@ ste_new(struct symtable *st, identifier name, _Py_block_ty block,
     ste->ste_child_free = 0;
     ste->ste_generator = 0;
     ste->ste_coroutine = 0;
+    ste->ste_comprehension = 0;
     ste->ste_returns_value = 0;
     ste->ste_needs_class_closure = 0;
 
@@ -972,7 +976,7 @@ symtable_lookup(struct symtable *st, PyObject *name)
 }
 
 static int
-symtable_add_def(struct symtable *st, PyObject *name, int flag)
+symtable_add_def_helper(struct symtable *st, PyObject *name, int flag, struct _symtable_entry *ste)
 {
     PyObject *o;
     PyObject *dict;
@@ -982,15 +986,15 @@ symtable_add_def(struct symtable *st, PyObject *name, int flag)
 
     if (!mangled)
         return 0;
-    dict = st->st_cur->ste_symbols;
+    dict = ste->ste_symbols;
     if ((o = PyDict_GetItem(dict, mangled))) {
         val = PyLong_AS_LONG(o);
         if ((flag & DEF_PARAM) && (val & DEF_PARAM)) {
             /* Is it better to use 'mangled' or 'name' here? */
             PyErr_Format(PyExc_SyntaxError, DUPLICATE_ARGUMENT, name);
             PyErr_SyntaxLocationObject(st->st_filename,
-                                       st->st_cur->ste_lineno,
-                                       st->st_cur->ste_col_offset + 1);
+                                       ste->ste_lineno,
+                                       ste->ste_col_offset + 1);
             goto error;
         }
         val |= flag;
@@ -1006,7 +1010,7 @@ symtable_add_def(struct symtable *st, PyObject *name, int flag)
     Py_DECREF(o);
 
     if (flag & DEF_PARAM) {
-        if (PyList_Append(st->st_cur->ste_varnames, mangled) < 0)
+        if (PyList_Append(ste->ste_varnames, mangled) < 0)
             goto error;
     } else      if (flag & DEF_GLOBAL) {
         /* XXX need to update DEF_GLOBAL for other flags too;
@@ -1032,6 +1036,11 @@ error:
     return 0;
 }
 
+static int
+symtable_add_def(struct symtable *st, PyObject *name, int flag) {
+    return symtable_add_def_helper(st, name, flag, st->st_cur);
+}
+
 /* VISIT, VISIT_SEQ and VIST_SEQ_TAIL take an ASDL type as their second argument.
    They use the ASDL name to synthesize the name of the C type and the visit
    function.
@@ -1082,7 +1091,7 @@ error:
 }
 
 static int
-symtable_record_directive(struct symtable *st, identifier name, stmt_ty s)
+symtable_record_directive(struct symtable *st, identifier name, int lineno, int col_offset)
 {
     PyObject *data, *mangled;
     int res;
@@ -1094,7 +1103,7 @@ symtable_record_directive(struct symtable *st, identifier name, stmt_ty s)
     mangled = _Py_Mangle(st->st_private, name);
     if (!mangled)
         return 0;
-    data = Py_BuildValue("(Nii)", mangled, s->lineno, s->col_offset);
+    data = Py_BuildValue("(Nii)", mangled, lineno, col_offset);
     if (!data)
         return 0;
     res = PyList_Append(st->st_cur->ste_directives, data);
@@ -1280,7 +1289,7 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
             }
             if (!symtable_add_def(st, name, DEF_GLOBAL))
                 VISIT_QUIT(st, 0);
-            if (!symtable_record_directive(st, name, s))
+            if (!symtable_record_directive(st, name, s->lineno, s->col_offset))
                 VISIT_QUIT(st, 0);
         }
         break;
@@ -1312,7 +1321,7 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
             }
             if (!symtable_add_def(st, name, DEF_NONLOCAL))
                 VISIT_QUIT(st, 0);
-            if (!symtable_record_directive(st, name, s))
+            if (!symtable_record_directive(st, name, s->lineno, s->col_offset))
                 VISIT_QUIT(st, 0);
         }
         break;
@@ -1368,6 +1377,60 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
 }
 
 static int
+symtable_extend_namedexpr_scope(struct symtable *st, expr_ty e)
+{
+    assert(st->st_stack);
+
+    Py_ssize_t i, size;
+    struct _symtable_entry *ste;
+    size = PyList_GET_SIZE(st->st_stack);
+    assert(size);
+
+    /* Iterate over the stack in reverse and add to the nearest adequate scope */
+    for (i = size - 1; i >= 0; i--) {
+        ste = (struct _symtable_entry *) PyList_GET_ITEM(st->st_stack, i);
+
+        /* If our current entry is a comprehension, skip it */
+        if (ste->ste_comprehension) {
+            continue;
+        }
+
+        /* If we find a FunctionBlock entry, add as NONLOCAL/LOCAL */
+        if (ste->ste_type == FunctionBlock) {
+            if (!symtable_add_def(st, e->v.Name.id, DEF_NONLOCAL))
+                VISIT_QUIT(st, 0);
+            if (!symtable_record_directive(st, e->v.Name.id, e->lineno, e->col_offset))
+                VISIT_QUIT(st, 0);
+
+            return symtable_add_def_helper(st, e->v.Name.id, DEF_LOCAL, ste);
+        }
+        /* If we find a ModuleBlock entry, add as GLOBAL */
+        if (ste->ste_type == ModuleBlock) {
+            if (!symtable_add_def(st, e->v.Name.id, DEF_GLOBAL))
+                VISIT_QUIT(st, 0);
+            if (!symtable_record_directive(st, e->v.Name.id, e->lineno, e->col_offset))
+                VISIT_QUIT(st, 0);
+
+            return symtable_add_def_helper(st, e->v.Name.id, DEF_GLOBAL, ste);
+        }
+        /* Disallow usage in ClassBlock */
+        if (ste->ste_type == ClassBlock) {
+            PyErr_Format(PyExc_TargetScopeError, NAMED_EXPR_COMP_IN_CLASS, e->v.Name.id);
+            PyErr_SyntaxLocationObject(st->st_filename,
+                                        e->lineno,
+                                        e->col_offset);
+            VISIT_QUIT(st, 0);
+        }
+    }
+
+    /* We should always find either a FunctionBlock, ModuleBlock or ClassBlock
+       and should never fall to this case
+    */
+    assert(0);
+    return 0;
+}
+
+static int
 symtable_visit_expr(struct symtable *st, expr_ty e)
 {
     if (++st->recursion_depth > st->recursion_limit) {
@@ -1376,6 +1439,10 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
         VISIT_QUIT(st, 0);
     }
     switch (e->kind) {
+    case NamedExpr_kind:
+        VISIT(st, expr, e->v.NamedExpr.value);
+        VISIT(st, expr, e->v.NamedExpr.target);
+        break;
     case BoolOp_kind:
         VISIT_SEQ(st, expr, e->v.BoolOp.values);
         break;
@@ -1476,6 +1543,11 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
         VISIT(st, expr, e->v.Starred.value);
         break;
     case Name_kind:
+        /* Special-case: named expr */
+        if (e->v.Name.ctx == NamedStore && st->st_cur->ste_comprehension) {
+            if(!symtable_extend_namedexpr_scope(st, e))
+                VISIT_QUIT(st, 0);
+        }
         if (!symtable_add_def(st, e->v.Name.id,
                               e->v.Name.ctx == Load ? USE : DEF_LOCAL))
             VISIT_QUIT(st, 0);
@@ -1713,6 +1785,8 @@ symtable_handle_comprehension(struct symtable *st, expr_ty e,
     if (outermost->is_async) {
         st->st_cur->ste_coroutine = 1;
     }
+    st->st_cur->ste_comprehension = 1;
+
     /* Outermost iter is received as an argument */
     if (!symtable_implicit_arg(st, 0)) {
         symtable_exit_block(st, (void *)e);