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Do not report exhaustive-match after deferral #19804

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Merged
ilevkivskyi merged 1 commit into from
Sep 7, 2025
Merged

Do not report exhaustive-match after deferral #19804

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Do not report exhaustive-match after deferral
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@sterliakov
sterliakov committed Sep 6, 2025
commit b63ffd81199e41c69d7b1930755ced8be945725f
4 changes: 2 additions & 2 deletions mypy/checker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5682,8 +5682,8 @@ def visit_match_stmt(self, s: MatchStmt) -> None:
self.push_type_map(else_map, from_assignment=False)
unmatched_types = else_map

if unmatched_types is not None:
for typ in list(unmatched_types.values()):
if unmatched_types is not None and not self.current_node_deferred:
for typ in unmatched_types.values():
self.msg.match_statement_inexhaustive_match(typ, s)

# This is needed due to a quirk in frame_context. Without it types will stay narrowed
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15 changes: 15 additions & 0 deletions test-data/unit/check-python310.test
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Expand Up @@ -2975,3 +2975,18 @@ val: int = 8
match val:
case FOO: # E: Cannot assign to final name "FOO"
pass

[case testMatchExhaustivenessWithDeferral]
# flags: --enable-error-code exhaustive-match
from typing import Literal
import unknown_module # E: Cannot find implementation or library stub for module named "unknown_module" \
# N: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports

def foo(e: Literal[0, 1]) -> None:
match e:
case 0:
defer
case 1:
...

defer = unknown_module.foo
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