Fix RawExpressionType.accept crash with --cache-fine-grained

Fixes python#17587. Signed-off-by: Anders Kaseorg <[email protected]>
andersk · Jul 26, 2024 · a0103b9 · a0103b9
1 parent e67decb
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diff --git a/mypy/types.py b/mypy/types.py
@@ -2705,6 +2705,8 @@ def simple_name(self) -> str:
         return self.base_type_name.replace("builtins.", "")
 
     def accept(self, visitor: TypeVisitor[T]) -> T:
+        if self.node is not None:
+            return self.node.accept(visitor)
         assert isinstance(visitor, SyntheticTypeVisitor)
         ret: T = visitor.visit_raw_expression_type(self)
         return ret

diff --git a/test-data/unit/check-typeddict.test b/test-data/unit/check-typeddict.test
@@ -1442,6 +1442,18 @@ reveal_type(x) # N: Revealed type is "TypedDict('__main__.X', {'a': TypedDict('_
 reveal_type(x['a']['b']) # N: Revealed type is "builtins.int"
 [builtins fixtures/dict.pyi]
 
+[case testTypedDictForwardReferenceCacheFineGrained]
+# flags: --cache-fine-grained
+from mypy_extensions import TypedDict
+class A(TypedDict):
+    b: "B"
+class B(TypedDict):
+    c: "C"
+class C(TypedDict):
+    d: "D"
+class D:
+    pass
+
 [case testSelfRecursiveTypedDictInheriting]
 from mypy_extensions import TypedDict