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bpo-34854: Fix compiling string annotations containing lambdas. (GH-9645)

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* Compiling a string annotation containing a lambda with keyword-only
argument without default value caused a crash.

* Remove the final "*" (it is incorrect syntax) in the representation of
lambda without *args and keyword-only arguments when compile from AST.

* Improve the representation of lambda without arguments.
This commit is contained in:
Serhiy Storchaka 2018-09-30 21:07:05 +03:00 • committed by GitHub
parent d5bd036138
commit 2a2940e5c3
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3 changed files with 11 additions and 5 deletions
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3
Lib/test/test_future.py
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@ -178,11 +178,12 @@ class AnnotationsFutureTestCase(unittest.TestCase):
eq('-1')
eq('~int and not v1 ^ 123 + v2 | True')
eq('a + (not b)')
eq('lambda: None')
eq('lambda arg: None')
eq('lambda a=True: a')
eq('lambda a, b, c=True: a')
eq("lambda a, b, c=True, *, d=1 << v2, e='str': a")
eq("lambda a, b, c=True, *vararg, d=v1 << 2, e='str', **kwargs: a + b")
eq("lambda a, b, c=True, *vararg, d, e='str', **kwargs: a + b")
eq('lambda x: lambda y: x + y')
eq('1 if True else 2')
eq('str or None if int or True else str or bytes or None')