PEP 308 implementation, including minor refdocs and some testcases. It

breaks the parser module, because it adds the if/else construct as well as
two new grammar rules for backward compatibility. If no one else fixes
parsermodule, I guess I'll go ahead and fix it later this week.

The TeX code was checked with texcheck.py, but not rendered. There is
actually a slight incompatibility:

>>> (x for x in lambda:0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: iteration over non-sequence

changes into

>>> (x for x in lambda: 0)
  File "<stdin>", line 1
    (x for x in lambda: 0)
                     ^
SyntaxError: invalid syntax

Since there's no way the former version can be useful, it's probably a
bugfix ;)

1 files changed, 40 insertions, 37 deletions

diff --git a/Include/graminit.h b/Include/graminit.h
index 2c855ea..e804734 100644
--- a/Include/graminit.h
+++ b/Include/graminit.h
@@ -40,40 +40,43 @@
 #define try_stmt 295
 #define except_clause 296
 #define suite 297
-#define test 298
-#define and_test 299
-#define not_test 300
-#define comparison 301
-#define comp_op 302
-#define expr 303
-#define xor_expr 304
-#define and_expr 305
-#define shift_expr 306
-#define arith_expr 307
-#define term 308
-#define factor 309
-#define power 310
-#define atom 311
-#define listmaker 312
-#define testlist_gexp 313
-#define lambdef 314
-#define trailer 315
-#define subscriptlist 316
-#define subscript 317
-#define sliceop 318
-#define exprlist 319
-#define testlist 320
-#define testlist_safe 321
-#define dictmaker 322
-#define classdef 323
-#define arglist 324
-#define argument 325
-#define list_iter 326
-#define list_for 327
-#define list_if 328
-#define gen_iter 329
-#define gen_for 330
-#define gen_if 331
-#define testlist1 332
-#define encoding_decl 333
-#define yield_expr 334
+#define testlist_safe 298
+#define old_test 299
+#define old_lambdef 300
+#define test 301
+#define or_test 302
+#define and_test 303
+#define not_test 304
+#define comparison 305
+#define comp_op 306
+#define expr 307
+#define xor_expr 308
+#define and_expr 309
+#define shift_expr 310
+#define arith_expr 311
+#define term 312
+#define factor 313
+#define power 314
+#define atom 315
+#define listmaker 316
+#define testlist_gexp 317
+#define lambdef 318
+#define trailer 319
+#define subscriptlist 320
+#define subscript 321
+#define sliceop 322
+#define exprlist 323
+#define testlist 324
+#define dictmaker 325
+#define classdef 326
+#define arglist 327
+#define argument 328
+#define list_iter 329
+#define list_for 330
+#define list_if 331
+#define gen_iter 332
+#define gen_for 333
+#define gen_if 334
+#define testlist1 335
+#define encoding_decl 336
+#define yield_expr 337