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Always re-process annotations refering to an alias on update #13759

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Merged
merged 1 commit into from
Sep 29, 2022
Merged

Always re-process annotations refering to an alias on update #13759

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1 change: 1 addition & 0 deletions mypy/semanal.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3022,6 +3022,7 @@ def process_type_annotation(self, s: AssignmentStmt) -> None:
analyzed = self.anal_type(s.type, allow_tuple_literal=allow_tuple_literal)
# Don't store not ready types (including placeholders).
if analyzed is None or has_placeholder(analyzed):
self.defer(s)
return
s.type = analyzed
if (
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20 changes: 20 additions & 0 deletions test-data/unit/check-dataclasses.test
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Expand Up @@ -1913,3 +1913,23 @@ class MyDataclass:

takes_cp(MyDataclass)
[builtins fixtures/dataclasses.pyi]

[case testDataclassTypeAnnotationAliasUpdated]
# flags: --enable-recursive-aliases
import a
[file a.py]
from dataclasses import dataclass
from b import B

@dataclass
class D:
x: B

reveal_type(D) # N: Revealed type is "def (x: builtins.list[b.C]) -> a.D"
[file b.py]
from typing import List
import a
B = List[C]
class C(CC): ...
class CC: ...
[builtins fixtures/dataclasses.pyi]