bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

Inline and remove SelectionContext::fast_reject_trait_refs.

Browse source 
Because it has a single call site, and it lets us move a small amount of
the work outside the loop.
This commit is contained in:
Nicholas Nethercote 2023-03-09 11:00:05 +11:00
parent 9fa69473fd
commit 03923661af
2 changed files with 4 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

16
compiler/rustc_trait_selection/src/traits/select/mod.rs
View file

@ -45,7 +45,6 @@ use rustc_infer::traits::TraitEngineExt;
use rustc_middle::dep_graph::{DepKind, DepNodeIndex};
use rustc_middle::mir::interpret::ErrorHandled;
use rustc_middle::ty::abstract_const::NotConstEvaluatable;
use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams};
use rustc_middle::ty::fold::BottomUpFolder;
use rustc_middle::ty::relate::TypeRelation;
use rustc_middle::ty::SubstsRef;
@ -2533,21 +2532,6 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
Ok(Normalized { value: impl_substs, obligations: nested_obligations })
}
fn fast_reject_trait_refs(
&mut self,
obligation: &TraitObligation<'tcx>,
impl_trait_ref: &ty::TraitRef<'tcx>,
) -> bool {
// We can avoid creating type variables and doing the full
// substitution if we find that any of the input types, when
// simplified, do not match.
let drcx = DeepRejectCtxt { treat_obligation_params: TreatParams::ForLookup };
!drcx.substs_refs_may_unify(
obligation.predicate.skip_binder().trait_ref.substs,
impl_trait_ref.substs,
)
}
/// Normalize `where_clause_trait_ref` and try to match it against
/// `obligation`. If successful, return any predicates that
/// result from the normalization.