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Rollup merge of #106931 - Ezrashaw:docs-e0208, r=compiler-errors

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document + UI test `E0208` and make its output more user-friendly

Cleans up `E0208`'s output a lot. It could actually be useful for someone learning about variance now. I also added a UI test for it in `tests/ui/error-codes/` and wrote some docs for it.

r? `@GuillaumeGomez` another error code, can't be bothered to find the issue :P. Obviously there's some compiler stuff, so you'll have to hand it off.

Part of https://github.com/rust-lang/rust/issues/61137.
This commit is contained in:
Guillaume Gomez 2023-01-19 11:19:35 +01:00 • committed by GitHub
commit 246daa49ee
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14 changed files with 96 additions and 46 deletions
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5
compiler/rustc_hir_analysis/src/variance/test.rs
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@ -1,4 +1,3 @@
use rustc_errors::struct_span_err;
use rustc_middle::ty::TyCtxt;
use rustc_span::symbol::sym;
@ -8,8 +7,8 @@ pub fn test_variance(tcx: TyCtxt<'_>) {
for id in tcx.hir().items() {
if tcx.has_attr(id.owner_id.to_def_id(), sym::rustc_variance) {
let variances_of = tcx.variances_of(id.owner_id);
struct_span_err!(tcx.sess, tcx.def_span(id.owner_id), E0208, "{:?}", variances_of)
.emit();
tcx.sess.struct_span_err(tcx.def_span(id.owner_id), format!("{variances_of:?}")).emit();
}
}
}