Issue #24485: Revert backwards compatibility breaking changes of #21217.

3 files changed, 14 insertions, 18 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 4c1ac1f..24c8df7 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -902,14 +902,6 @@ def getblock(lines):
         pass
     return lines[:blockfinder.last]
 
-def _line_number_helper(code_obj, lines, lnum):
-    """Return a list of source lines and starting line number for a code object.
-
-    The arguments must be a code object with lines and lnum from findsource.
-    """
-    _, end_line = list(dis.findlinestarts(code_obj))[-1]
-    return lines[lnum:end_line], lnum + 1
-
 def getsourcelines(object):
     """Return a list of source lines and starting line number for an object.
 
@@ -921,16 +913,8 @@ def getsourcelines(object):
     object = unwrap(object)
     lines, lnum = findsource(object)
 
-    if ismodule(object):
-        return lines, 0
-    elif iscode(object):
-        return _line_number_helper(object, lines, lnum)
-    elif isfunction(object):
-        return _line_number_helper(object.__code__, lines, lnum)
-    elif ismethod(object):
-        return _line_number_helper(object.__func__.__code__, lines, lnum)
-    else:
-        return getblock(lines[lnum:]), lnum + 1
+    if ismodule(object): return lines, 0
+    else: return getblock(lines[lnum:]), lnum + 1
 
 def getsource(object):
     """Return the text of the source code for an object.
diff --git a/Lib/test/inspect_fodder2.py b/Lib/test/inspect_fodder2.py
index ab1cd9f..c6987ea 100644
--- a/Lib/test/inspect_fodder2.py
+++ b/Lib/test/inspect_fodder2.py
@@ -130,3 +130,10 @@ def decorator(func):
 @decorator
 def real():
     return 20
+
+#line 134
+class cls135:
+    def func136():
+        def func137():
+            never_reached1
+            never_reached2
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index e620893..042617b 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -464,6 +464,7 @@ class TestDecorators(GetSourceBase):
     def test_getsource_unwrap(self):
         self.assertSourceEqual(mod2.real, 130, 132)
 
+    @unittest.expectedFailure
     def test_decorator_with_lambda(self):
         self.assertSourceEqual(mod2.func114, 113, 115)
 
@@ -563,6 +564,10 @@ class TestBuggyCases(GetSourceBase):
     def test_getsource_on_method(self):
         self.assertSourceEqual(mod2.ClassWithMethod.method, 118, 119)
 
+    def test_nested_func(self):
+        self.assertSourceEqual(mod2.cls135.func136, 136, 139)
+
+
 class TestNoEOL(GetSourceBase):
     def setUp(self):
         self.tempdir = TESTFN + '_dir'