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As part of #20598, we added `is_identical_to` methods to `TypeVarInstance` and `BoundTypeVarInstance`, which compare when two typevar instances refer to "the same" underlying typevar, even if we have forced their lazy bounds/constraints as part of marking typevars as inferable. (Doing so results in a different salsa interned struct ID, since we've changed the contents of the `bounds_or_constraints` field.) It turns out that marking typevars as inferable is not the only way that we might force lazy bounds/constraints; it also happens when we materialize a type containing a typevar. This surfaced as ecosystem report failures on #20677. That means that we need a more long-term fix to this problem. (`is_identical_to`, and its underlying `original` field, were meant to be a temporary fix until we removed the `MarkTypeVarsInferable` type mapping.) This PR extracts out a separate type (`TypeVarIdentity`) that only includes the fields that actually inform whether two typevars are "the same". All other properties of the typevar (default, bounds/constraints, etc) still live in `TypeVarInstance`. Call sites that care about typevar identity can now either store just `TypeVarIdentity` (if they never need access to those other properties), or continue to store `TypeVarInstance` but pull out its `identity` when performing those "are they the same typevar" comparisons. (All of this also applies respectively to `BoundTypeVar{Identity,Instance}`.) In particular, constraint sets now work on `BoundTypeVarIdentity`, and generic contexts still _store_ a `BoundTypeVarInstance` (since we might need access to defaults when specializing), but are keyed on `BoundTypeVarIdentity`. |
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