Improve spans for specialization error #98782
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| _ => { | ||
| tcx.sess | ||
| .struct_span_err(span, &format!("cannot specialize on `{:?}`", predicate)) | ||
| .struct_span_err(span, &format!("cannot specialize on predicate `{}`", predicate)) |
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the other predicates have a display impl, why not use it
| tcx.sess | ||
| .struct_span_err( | ||
| span, | ||
| &format!("cannot specialize on associated type `{projection_ty} == {term}`",), |
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hm, i guess i could rebind projection_ty if it has bound vars, but i don't think people are specializing on for<'a> Ty: Trait<Proj = &'a ()>, so it's not necessarily worth the complexity I guess. Also we'd need to skip the binder on term still, so we don't print for<..> assoc == for<..> term..
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yea, not really worth it for the diagnostic. You could emit another note if the binders actually bind anything stating that specialization on lifetimes is not... ideal. But unless we have some good specialization docs for that that we could link to, not really worth it.
| @@ -384,9 +389,17 @@ fn check_specialization_on<'tcx>(tcx: TyCtxt<'tcx>, predicate: ty::Predicate<'tc | |||
| .emit(); | |||
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i can't leave a comment on line (new) 385 (old 380), but we should probably just print the whole trait ref instead of just the def path...?
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☔ The latest upstream changes (presumably #93967) made this pull request unmergeable. Please resolve the merge conflicts. |
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…r-span, r=oli-obk Improve spans for specialization error Fixes rust-lang#98777
…r-span, r=oli-obk Improve spans for specialization error Fixes rust-lang#98777
…r-span, r=oli-obk Improve spans for specialization error Fixes rust-lang#98777
…askrgr Rollup of 8 pull requests Successful merges: - rust-lang#98738 (Clarify MIR semantics of checked binary operations) - rust-lang#98782 (Improve spans for specialization error) - rust-lang#98793 (Lint against executable files in the root directory) - rust-lang#98814 (rustdoc: Censor certain complex unevaluated const exprs) - rust-lang#98878 (add more `rustc_pass_by_value`) - rust-lang#98879 (Fix "wrap closure in parenthesis" suggestion for `async` closure) - rust-lang#98886 (incr.comp.: Make split-dwarf commandline options [TRACKED].) - rust-lang#98898 (Add "no-div-regex" eslint rule) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
Fixes #98777