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Improve selection errors for ~const trait bounds

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Deadbeef 2021-12-24 22:50:44 +08:00
parent 17dfae79bb
commit fdf7d01088
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23 changed files with 323 additions and 203 deletions
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5
compiler/rustc_trait_selection/src/traits/wf.rs
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@ -306,10 +306,9 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
let extend = |obligation: traits::PredicateObligation<'tcx>| {
let mut cause = cause.clone();
if let Some(parent_trait_ref) = obligation.predicate.to_opt_poly_trait_pred() {
if let Some(parent_trait_pred) = obligation.predicate.to_opt_poly_trait_pred() {
let derived_cause = traits::DerivedObligationCause {
// FIXME(fee1-dead): when improving error messages, change this to PolyTraitPredicate
parent_trait_ref: parent_trait_ref.map_bound(|t| t.trait_ref),
parent_trait_pred,
parent_code: obligation.cause.clone_code(),
};
*cause.make_mut_code() =