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bpo-10544: Disallow "yield" in comprehensions and generator expressions. (GH-4564)

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Serhiy Storchaka 2018-02-04 10:53:48 +02:00 • committed by GitHub
parent 8b5fa289fd
commit 07ca9afaa8
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6 changed files with 32 additions and 49 deletions
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12
Lib/test/test_grammar.py
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@ -251,6 +251,8 @@ class CNS:
class GrammarTests(unittest.TestCase):
check_syntax_error = check_syntax_error
# single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
# XXX can't test in a script -- this rule is only used when interactive
@ -920,15 +922,7 @@ class GrammarTests(unittest.TestCase):
def g(): [x for x in [(yield 1)]]
def g(): [x for x in [(yield from ())]]
def check(code, warntext):
with self.assertWarnsRegex(DeprecationWarning, warntext):
compile(code, '<test string>', 'exec')
import warnings
with warnings.catch_warnings():
warnings.filterwarnings('error', category=DeprecationWarning)
with self.assertRaisesRegex(SyntaxError, warntext):
compile(code, '<test string>', 'exec')
check = self.check_syntax_error
check("def g(): [(yield x) for x in ()]",
"'yield' inside list comprehension")
check("def g(): [x for x in () if not (yield x)]",