a05f2cc44d
Don't give APITs names with macro expansion placeholder fragments in it The `DefCollector` previously called `pprust::ty_to_string` to construct a name for APITs (arg-position impl traits). The `ast::Ty` that was being formatted however has already had its macro calls replaced with "placeholder fragments", which end up rendering like `!()` (or ICEing, in the case of rust-lang/rust#140333, since it led to a placeholder struct field with no name). Instead, collect the name of the APIT *before* we visit its macros and replace them with placeholders in the macro expander. This makes the implementation a bit more involved, but AFAICT there's no better way to do this since we can't do a reverse mapping from placeholder fragment -> original macro call AST. Fixes rust-lang/rust#140333 |
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