Fix semantic analysis of assignment expressions (#11153)

Fixes half of #11060 Co-authored-by: hauntsaninja <>
python · Sep 21, 2021 · d7bb840 · d7bb840
1 parent a7d6e68
commit d7bb840
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diff --git a/mypy/semanal.py b/mypy/semanal.py
@@ -2745,7 +2745,7 @@ def analyze_name_lvalue(self,
                 self.msg.cant_assign_to_final(name, self.type is not None, lvalue)
 
         kind = self.current_symbol_kind()
-        names = self.current_symbol_table()
+        names = self.current_symbol_table(escape_comprehensions=escape_comprehensions)
         existing = names.get(name)
 
         outer = self.is_global_or_nonlocal(name)

diff --git a/test-data/unit/check-python38.test b/test-data/unit/check-python38.test
@@ -418,3 +418,9 @@ def main(a: object) -> None:
         reveal_type(x)  # N: Revealed type is "builtins.float"
         reveal_type(a)  # N: Revealed type is "builtins.object"
 [builtins fixtures/tuple.pyi]
+
+[case testWalrusRedefined]
+def foo() -> None:
+    x = 0
+    [x := x + y for y in [1, 2, 3]]
+[builtins fixtures/dict.pyi]