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add subst_identity_iter and subst_identity_iter_copied methods on EarlyBinder; use this to simplify some EarlyBinder noise around explicit_item_bounds calls

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This commit is contained in:
Kyle Matsuda 2023-04-17 17:19:08 -06:00
parent f3b279fcc5
commit e54854f6a9
12 changed files with 43 additions and 50 deletions
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4
compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs
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@ -74,9 +74,7 @@ impl<'tcx> LateLintPass<'tcx> for OpaqueHiddenInferredBound {
// For every projection predicate in the opaque type's explicit bounds,
// check that the type that we're assigning actually satisfies the bounds
// of the associated type.
for bound in cx.tcx.explicit_item_bounds(def_id).transpose_iter() {
let (pred, pred_span) = bound.map_bound(|b| *b).subst_identity();
for (pred, pred_span) in cx.tcx.explicit_item_bounds(def_id).subst_identity_iter_copied() {
// Liberate bound regions in the predicate since we
// don't actually care about lifetimes in this check.
let predicate = cx.tcx.liberate_late_bound_regions(def_id, pred.kind());