Rollup merge of #147109 - BoxyUwU:rename_concrete_opaques, r=lcnr

Rename various "concrete opaque type" things to say "hidden type"

r? lcnr

I've found "concrete opaque type" terminology to be somewhat confusing as in conversation and when explaining opaque type stuff to people I always just talk about things in terms of hidden types. Also the hidden types of opaques are very much not *concrete* in the same sense that a type without any generic parameters is concrete which is an unfortunate overlap in terminology.

I've tried to update comments to also stop referring to things as concrete opaque types but this is mostly best effort as it difficult to find all such cases amongst the massive amounts of uses of "concrete" or "hidden" across the whole compiler.

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs
index 1dd31990ab7..fb4f28412d4 100644
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@@ -2359,7 +2359,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                 if self.infcx.can_define_opaque_ty(def_id) {
                     unreachable!()
                 } else {
-                    // We can resolve the `impl Trait` to its concrete type,
+                    // We can resolve the opaque type to its hidden type,
                     // which enforces a DAG between the functions requiring
                     // the auto trait bounds in question.
                     match self.tcx().type_of_opaque(def_id) {