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So that given a `TypeRef` we will be able to trace it back to source code. This is necessary to be able to provide diagnostics for lowering to chalk tys, since the input to that is `TypeRef`. This means that `TypeRef`s now have an identity, which means storing them in arena and not interning them, which is an unfortunate (but necessary) loss but also a pretty massive change. Luckily, because of the separation layer we have for IDE and HIR, this change never crosses the IDE boundary.