bjoernager/rust
bjoernager/rust
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Introduce DeepRejectCtxt::substs_refs_may_unify.

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It factors out a repeated code pattern.
This commit is contained in:
Nicholas Nethercote 2023-03-07 15:42:50 +11:00
parent 478cbb42b7
commit 47225e8700
5 changed files with 23 additions and 17 deletions
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15
compiler/rustc_middle/src/ty/fast_reject.rs
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@ -1,6 +1,6 @@
use crate::mir::Mutability;
use crate::ty::subst::GenericArgKind;
use crate::ty::{self, Ty, TyCtxt, TypeVisitableExt};
use crate::ty::{self, SubstsRef, Ty, TyCtxt, TypeVisitableExt};
use rustc_hir::def_id::DefId;
use std::fmt::Debug;
use std::hash::Hash;
@ -188,6 +188,15 @@ pub struct DeepRejectCtxt {
}
impl DeepRejectCtxt {
pub fn substs_refs_may_unify<'tcx>(
self,
obligation_substs: SubstsRef<'tcx>,
impl_substs: SubstsRef<'tcx>,
) -> bool {
iter::zip(obligation_substs, impl_substs)
.all(|(obl, imp)| self.generic_args_may_unify(obl, imp))
}
pub fn generic_args_may_unify<'tcx>(
self,
obligation_arg: ty::GenericArg<'tcx>,
@ -258,9 +267,7 @@ impl DeepRejectCtxt {
},
ty::Adt(obl_def, obl_substs) => match k {
&ty::Adt(impl_def, impl_substs) => {
obl_def == impl_def
&& iter::zip(obl_substs, impl_substs)
.all(|(obl, imp)| self.generic_args_may_unify(obl, imp))
obl_def == impl_def && self.substs_refs_may_unify(obl_substs, impl_substs)
}
_ => false,
},