Auto merge of #120951 - matthiaskrgr:rollup-0nnm7dv, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #110483 (Create try_new function for ThinBox)
 - #120740 (Make cmath.rs a single file)
 - #120872 (hir: Refactor getters for HIR parents)
 - #120880 (add note on comparing vtables / function pointers)
 - #120885 (interpret/visitor: ensure we only see normalized types)
 - #120888 (assert_unsafe_precondition cleanup)
 - #120897 (Encode `coroutine_for_closure` for foreign crates)
 - #120937 ([docs] Update armv6k-nintendo-3ds platform docs for outdated info)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 3 insertions, 4 deletions

diff --git a/compiler/rustc_const_eval/src/transform/check_consts/mod.rs b/compiler/rustc_const_eval/src/transform/check_consts/mod.rs
index 98276ff2e68..1be2a2bc1f3 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/mod.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/mod.rs
@@ -131,11 +131,10 @@ fn is_parent_const_stable_trait(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
     let local_def_id = def_id.expect_local();
     let hir_id = tcx.local_def_id_to_hir_id(local_def_id);
 
-    let Some(parent) = tcx.hir().opt_parent_id(hir_id) else { return false };
-
-    if !tcx.is_const_trait_impl_raw(parent.owner.def_id.to_def_id()) {
+    let parent_owner_id = tcx.parent_hir_id(hir_id).owner;
+    if !tcx.is_const_trait_impl_raw(parent_owner_id.to_def_id()) {
         return false;
     }
 
-    tcx.lookup_const_stability(parent.owner).is_some_and(|stab| stab.is_const_stable())
+    tcx.lookup_const_stability(parent_owner_id).is_some_and(|stab| stab.is_const_stable())
 }