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gh-91162: Support splitting of unpacked arbitrary-length tuple over TypeVar and TypeVarTuple parameters (alt) (GH-93412)

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For example:

  A[T, *Ts][*tuple[int, ...]] -> A[int, *tuple[int, ...]]
  A[*Ts, T][*tuple[int, ...]] -> A[*tuple[int, ...], int]
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Serhiy Storchaka 2022-06-12 16:22:01 +03:00 • committed by GitHub
parent 23c9febdc6
commit 3473817106
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6 changed files with 108 additions and 129 deletions
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17
Lib/test/test_typing.py
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@ -753,14 +753,11 @@ class GenericAliasSubstitutionTests(BaseTestCase):
('generic[*Ts]', '[*tuple_type[int]]', 'generic[int]'),
('generic[*Ts]', '[*tuple_type[*Ts]]', 'generic[*Ts]'),
('generic[*Ts]', '[*tuple_type[int, str]]', 'generic[int, str]'),
('generic[*Ts]', '[str, *tuple_type[int, ...], bool]', 'generic[str, *tuple_type[int, ...], bool]'),
('generic[*Ts]', '[tuple_type[int, ...]]', 'generic[tuple_type[int, ...]]'),
('generic[*Ts]', '[tuple_type[int, ...], tuple_type[str, ...]]', 'generic[tuple_type[int, ...], tuple_type[str, ...]]'),
('generic[*Ts]', '[*tuple_type[int, ...]]', 'generic[*tuple_type[int, ...]]'),
# Technically, multiple unpackings are forbidden by PEP 646, but we
# choose to be less restrictive at runtime, to allow folks room
# to experiment. So all three of these should be valid.
('generic[*Ts]', '[*tuple_type[int, ...], *tuple_type[str, ...]]', 'generic[*tuple_type[int, ...], *tuple_type[str, ...]]'),
('generic[*Ts]', '[*tuple_type[int, ...], *tuple_type[str, ...]]', 'TypeError'),
('generic[*Ts]', '[*Ts]', 'generic[*Ts]'),
('generic[*Ts]', '[T, *Ts]', 'generic[T, *Ts]'),
@ -772,8 +769,6 @@ class GenericAliasSubstitutionTests(BaseTestCase):
('generic[list[T], *Ts]', '[int, str]', 'generic[list[int], str]'),
('generic[list[T], *Ts]', '[int, str, bool]', 'generic[list[int], str, bool]'),
('generic[T, *Ts]', '[*tuple[int, ...]]', 'TypeError'), # Should be generic[int, *tuple[int, ...]]
('generic[*Ts, T]', '[int]', 'generic[int]'),
('generic[*Ts, T]', '[int, str]', 'generic[int, str]'),
('generic[*Ts, T]', '[int, str, bool]', 'generic[int, str, bool]'),
@ -781,6 +776,14 @@ class GenericAliasSubstitutionTests(BaseTestCase):
('generic[*Ts, list[T]]', '[int, str]', 'generic[int, list[str]]'),
('generic[*Ts, list[T]]', '[int, str, bool]', 'generic[int, str, list[bool]]'),
('generic[T, *Ts]', '[*tuple_type[int, ...]]', 'generic[int, *tuple_type[int, ...]]'),
('generic[*Ts, T]', '[*tuple_type[int, ...]]', 'generic[*tuple_type[int, ...], int]'),
('generic[T1, *Ts, T2]', '[*tuple_type[int, ...]]', 'generic[int, *tuple_type[int, ...], int]'),
('generic[T, str, *Ts]', '[*tuple_type[int, ...]]', 'generic[int, str, *tuple_type[int, ...]]'),
('generic[*Ts, str, T]', '[*tuple_type[int, ...]]', 'generic[*tuple_type[int, ...], str, int]'),
('generic[list[T], *Ts]', '[*tuple_type[int, ...]]', 'generic[list[int], *tuple_type[int, ...]]'),
('generic[*Ts, list[T]]', '[*tuple_type[int, ...]]', 'generic[*tuple_type[int, ...], list[int]]'),
('generic[T, *tuple_type[int, ...]]', '[str]', 'generic[str, *tuple_type[int, ...]]'),
('generic[T1, T2, *tuple_type[int, ...]]', '[str, bool]', 'generic[str, bool, *tuple_type[int, ...]]'),
('generic[T1, *tuple_type[int, ...], T2]', '[str, bool]', 'generic[str, *tuple_type[int, ...], bool]'),