fix: Remove SolverDefId::ForeignId
#20545
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Replace it with normal `SolverDefId::TypeAliasId`. The split caused a very funny bug where code was getting `TypeAliasId` where it expected `ForeignId`, because `TypeAliasId` had a `From` impl from `hir_def::TypeAliasId` and `ForeignId` had not, plus a careless `into()`. I could've fixed this specific bug but opted to remove the split instead; currently, it just provides more room for bugs, as we don't have typed IDs for the solver anyway, and even when we'll have (hopefully), that doesn't seem like a very useful distinction, for example in hir-def foreign types are just `TypeAliasId` with some flags. Constructing a test for this isn't trivial; the trivial test (creating a foreign type, even proving a trait bound for it) fails to fail before the change, probably because we don't use the new solver everywhere yet so we don't trigger this specific code path.
lnicola
approved these changes
Aug 26, 2025
|
changelog fixup #20329 |
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Replace it with normal
SolverDefId::TypeAliasId.The split caused a very funny bug where code was getting
TypeAliasIdwhere it expectedForeignId, becauseTypeAliasIdhad aFromimpl fromhir_def::TypeAliasIdandForeignIdhad not, plus a carelessinto().I could've fixed this specific bug but opted to remove the split instead; currently, it just provides more room for bugs, as we don't have typed IDs for the solver anyway, and even when we'll have (hopefully), that doesn't seem like a very useful distinction, for example in hir-def foreign types are just
TypeAliasIdwith some flags.Constructing a test for this isn't trivial; the trivial test (creating a foreign type, even proving a trait bound for it) fails to fail before the change, probably because we don't use the new solver everywhere yet so we don't trigger this specific code path.
Fixes #20544.