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Fix native parser for quoted None types #22091

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Fix native parser for quoted None types #22091

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2 changes: 2 additions & 0 deletions mypy/nativeparse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -269,6 +269,8 @@ def native_parse_type_string(
data = ReadBuffer(ast_bytes)
ret = read_type(state, data)
assert isinstance(ret, ProperType)
if isinstance(ret, RawExpressionType) and expr_string == "None":
return UnboundType("None", line=line, column=column)
return ret


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6 changes: 6 additions & 0 deletions test-data/unit/check-newsemanal.test
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Expand Up @@ -2311,6 +2311,12 @@ reveal_type(x.x) # N: Revealed type is "builtins.int"
C = NamedTuple('C', [('x', int)])
[builtins fixtures/tuple.pyi]

[case testNewAnalyzerCastNoneString]
from typing import Any, cast

def f(x: Any) -> None:
return cast("None", x)

[case testNewAnalyzerApplicationForward1]
# flags: --disable-error-code used-before-def
from typing import Generic, TypeVar
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