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narrow unions on initial assignment #7

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narrow unions on initial assignment #7

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13 changes: 12 additions & 1 deletion mypy/checker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3231,7 +3231,18 @@ def visit_assignment_stmt(self, s: AssignmentStmt) -> None:
# as X | Y.
if not (s.is_alias_def and self.is_stub):
with self.enter_final_context(s.is_final_def):
self.check_assignment(s.lvalues[-1], s.rvalue, s.type is None, s.new_syntax)
self.check_assignment(
s.lvalues[-1],
s.rvalue,
infer_lvalue_type=(
s.type is None
or (
(not isinstance(s.rvalue, TempNode) or not s.rvalue.no_rhs)
and isinstance(get_proper_type(s.type), UnionType)
)
),
new_syntax=s.new_syntax,
)

if s.is_alias_def:
self.check_type_alias_rvalue(s)
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