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Avoid false unreachable and redundant-expr warnings in loops. #18433

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Merged
hauntsaninja merged 3 commits into from
Jan 12, 2025
Merged

Avoid false unreachable and redundant-expr warnings in loops. #18433

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53d894a
Avoid false `unreachable` and `redundant-expr` warnings in loops.
tyralla Jan 9, 2025
9b54ab1
Do not enable `REDUNDANT_EXPR` accidentally.
tyralla Jan 10, 2025
f0fac6d
refactor
tyralla Jan 12, 2025
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Do not enable REDUNDANT_EXPR accidentally.
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@tyralla
tyralla committed Jan 10, 2025
commit 9b54ab1635a8a7e6d81ce7d304bf0e2a289a7704
3 changes: 2 additions & 1 deletion mypy/checker.py
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Expand Up @@ -612,7 +612,8 @@ def accept_loop(
# If necessary, reset the modified options and make up for the postponed error checks:
if warn_unreachable or warn_redundant:
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@ilevkivskyi ilevkivskyi Jan 11, 2025

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IMO this if and the two ifs above are only making the logic more obscure. It should be simply: store, set, restore.

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@tyralla tyralla Jan 12, 2025

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I removed the two ifs above (one of them by using set.discard instead of set.remove). However, removing the third if would mean unnecessary calls of self.accept(body) in cases where neither unreachable nor redundant-expr are enabled. But I adjusted the latter according to @hauntsaninja's suggestion, which might look a little clearer.

self.options.warn_unreachable = warn_unreachable
self.options.enabled_error_codes.add(codes.REDUNDANT_EXPR)
if warn_redundant:
self.options.enabled_error_codes.add(codes.REDUNDANT_EXPR)
with self.binder.frame_context(can_skip=True, break_frame=2, continue_frame=1):
self.accept(body)

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