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Move an extension trait method onto the type directly and reuse it

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This commit is contained in:
Oli Scherer 2022-05-10 09:26:09 +00:00
parent 7e2e3d4ebe
commit 704bbe5210
5 changed files with 36 additions and 46 deletions
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36
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -2342,42 +2342,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
}
}
trait TraitObligationExt<'tcx> {
fn derived_cause(
&self,
variant: fn(DerivedObligationCause<'tcx>) -> ObligationCauseCode<'tcx>,
) -> ObligationCause<'tcx>;
}
impl<'tcx> TraitObligationExt<'tcx> for TraitObligation<'tcx> {
fn derived_cause(
&self,
variant: fn(DerivedObligationCause<'tcx>) -> ObligationCauseCode<'tcx>,
) -> ObligationCause<'tcx> {
/*!
* Creates a cause for obligations that are derived from
* `obligation` by a recursive search (e.g., for a builtin
* bound, or eventually a `auto trait Foo`). If `obligation`
* is itself a derived obligation, this is just a clone, but
* otherwise we create a "derived obligation" cause so as to
* keep track of the original root obligation for error
* reporting.
*/
let obligation = self;
// NOTE(flaper87): As of now, it keeps track of the whole error
// chain. Ideally, we should have a way to configure this either
// by using -Z verbose or just a CLI argument.
let derived_cause = DerivedObligationCause {
parent_trait_pred: obligation.predicate,
parent_code: obligation.cause.clone_code(),
};
let derived_code = variant(derived_cause);
ObligationCause::new(obligation.cause.span, obligation.cause.body_id, derived_code)
}
}
impl<'o, 'tcx> TraitObligationStack<'o, 'tcx> {
fn list(&'o self) -> TraitObligationStackList<'o, 'tcx> {
TraitObligationStackList::with(self)