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Dana Jansens
168420f805
Previously the last decl had to be the definition. Now we allow a declaration after a definition, so that the user can write a match_first block last, and put (re-)declarations of impls in it, after the definitions have already been written elsewhere. We track the location of the decl that was associated with a match_first block so that we can correctly point to it in diagnostics when an impl is written twice in match_first blocks. Since impls may not be redeclared across an import boundary, we will never have a `SemIR::Impl` with a match_first from a different file in a redeclaration, so we don't need to import the location of a previous decl that was in a match_first for diagnostics. As such we just store a LocId on the `SemIR::Impl` struct.