Fix isomorphism tests of AndOrTypes under non-empty BinderPairs
#21017
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Before the changes, when comparing two `HKTypeLambda` result types, the list of binding pairs was lost when entering comparison of `AndOrType`s, which caused the `equals` to fail, and hence prevented `hash-consing`. Even though, `M1` and `M2` in pos/i20858-min should still conform to one-another, we entered a deep-subtype comparison because of the order in which the TypeComparer does dealiasing of AppliedTypes, comparison of MatchCases, and AndTypes.
EugeneFlesselle
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Jul 4, 2024
WojciechMazur
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Aug 28, 2024
…21017) Before the changes, when comparing two `HKTypeLambda` result types, the list of binding pairs was lost when entering comparison of `AndOrType`s, which caused the `equals` to fail, and hence prevented hash-consing. Even though `M1` and `M2` in pos/i20858-min should still conform to one-another, we entered a deep-subtype comparison because of the order in which the TypeComparer does dealiasing of AppliedTypes, and comparison of MatchCases and AndTypes. Fix #20858 [Cherry-picked f2829c3]
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Before the changes, when comparing two
HKTypeLambdaresult types, the list of binding pairs was lost when entering comparison ofAndOrTypes, which caused theequalsto fail, and hence prevented hash-consing.Even though
M1andM2in pos/i20858-min should still conform to one-another, we entered a deep-subtype comparison because of the order in which the TypeComparer does dealiasing of AppliedTypes, and comparison of MatchCases and AndTypes.Fix #20858