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[3.9] bpo-40334: Produce better error messages on invalid targets (GH-20106) (GH-20973)

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* bpo-40334: Produce better error messages on invalid targets (GH-20106)

The following error messages get produced:
- `cannot delete ...` for invalid `del` targets
- `... is an illegal 'for' target` for invalid targets in for
  statements
- `... is an illegal 'with' target` for invalid targets in
  with statements

Additionally, a few `cut`s were added in various places before the
invocation of the `invalid_*` rule, in order to speed things
up.

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
(cherry picked from commit 01ece63d42)
This commit is contained in:
Lysandros Nikolaou 2020-06-19 03:03:58 +03:00 • committed by GitHub
parent b1e7361134
commit a5442b26f4
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6 changed files with 2649 additions and 2258 deletions
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2
Lib/test/test_exceptions.py
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@ -253,7 +253,7 @@ class ExceptionTests(unittest.TestCase):
check('foo(x for x in range(10), 100)', 1, 5)
check('(yield i) = 2', 1, 1 if support.use_old_parser() else 2)
check('def f(*):\n pass', 1, 7 if support.use_old_parser() else 8)
check('for 1 in []: pass', 1, 5 if support.use_old_parser() else 7)
check('for 1 in []: pass', 1, 5)
@cpython_only
def testSettingException(self):