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A random hack to try fixing performace issues #14276

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A random hack to try fixing performace issues #14276

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3 changes: 3 additions & 0 deletions mypy/subtypes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -301,6 +301,9 @@ def check_item(left: Type, right: Type, subtype_context: SubtypeContext) -> bool
is_subtype_of_item = any(
check_item(orig_left, item, subtype_context) for item in right.items
)
if proper_subtype:
# This is a hack to avoid some performance issues, see #13821
return is_subtype_of_item
# Recombine rhs literal types, to make an enum type a subtype
# of a union of all enum items as literal types. Only do it if
# the previous check didn't succeed, since recombining can be
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