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Add conformance test for nested Optional behavior #2240

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Add conformance test for nested Optional behavior #2240

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16 changes: 16 additions & 0 deletions conformance/tests/specialtypes_optional_nested.py
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Original file line number Diff line number Diff line change
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"""
Tests for behavior of nested Optional types collapsing.

Optional[Optional[T]] should behave as Optional[T].
"""

from typing import Optional, assert_type


def test_nested_optional(x: Optional[Optional[int]]) -> None:
# Should behave like Optional[int]
assert_type(x, Optional[int])


def test_nested_optional_error(x: Optional[Optional[int]]) -> int:
return x # E
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