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restore spans for issue-50480

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This commit is contained in:
Michael Goulet 2022-02-06 15:57:29 -08:00
parent 8ba74369c2
commit ee98dc8b3b
3 changed files with 30 additions and 19 deletions
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15
compiler/rustc_trait_selection/src/traits/misc.rs
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@ -50,8 +50,21 @@ pub fn can_type_implement_copy<'tcx>(
continue;
}
let span = tcx.def_span(field.did);
// FIXME(compiler-errors): This gives us better spans for bad
// projection types like in issue-50480.
// If the ADT has substs, point to the cause we are given.
// If it does not, then this field probably doesn't normalize
// to begin with, and point to the bad field's span instead.
let cause = if field
.ty(tcx, traits::InternalSubsts::identity_for_item(tcx, adt.did))
.has_param_types_or_consts()
{
cause.clone()
} else {
ObligationCause::dummy_with_span(span)
};
let ctx = traits::FulfillmentContext::new();
match traits::fully_normalize(&infcx, ctx, cause.clone(), param_env, ty) {
match traits::fully_normalize(&infcx, ctx, cause, param_env, ty) {
Ok(ty) => {
if !infcx.type_is_copy_modulo_regions(param_env, ty, span) {
infringing.push(field);