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Use source_type.last_known_value when Instance. Fixes #12923 #15123

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merged 7 commits into from
Apr 26, 2023
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Use source_type.last_known_value when Instance. Fixes #12923 #15123

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06c1a61
Use source_type.last_known_value when Instance. Fixes #12923
CarlFK Apr 25, 2023
58ab380
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 25, 2023
44fc14a
source_type might not have last_known_value attribute (I guess?) so h…
CarlFK Apr 25, 2023
3695906
source_type might not have last_known_value attribute (I guess?) so h…
CarlFK Apr 25, 2023
ad032d8
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 25, 2023
2112602
Update mypy/checkexpr.py
hauntsaninja Apr 25, 2023
4f2e80a
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 25, 2023
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4 changes: 4 additions & 0 deletions mypy/checkexpr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3918,6 +3918,10 @@ def visit_assert_type_expr(self, expr: AssertTypeExpr) -> Type:
always_allow_any=True,
)
target_type = expr.type
if isinstance(mypy.types.get_proper_type(source_type), mypy.types.Instance) and (
hasattr(source_type, "last_known_value") and source_type.last_known_value is not None
):
source_type = source_type.last_known_value
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if not is_same_type(source_type, target_type):
if not self.chk.in_checked_function():
self.msg.note(
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2 changes: 2 additions & 0 deletions test-data/unit/check-expressions.test
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Expand Up @@ -937,6 +937,8 @@ reveal_type(returned) # N: Revealed type is "builtins.int"
assert_type(a, str) # E: Expression is of type "int", not "str"
assert_type(a, Any) # E: Expression is of type "int", not "Any"
assert_type(a, Literal[1]) # E: Expression is of type "int", not "Literal[1]"
assert_type(42, Literal[42])
assert_type(42, int) # E: Expression is of type "Literal[42]", not "int"
[builtins fixtures/tuple.pyi]

[case testAssertTypeGeneric]
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