From 95e1a39c048b922754b3bc0fc5d305259a56289f Mon Sep 17 00:00:00 2001
From: Boxy <supbscripter@gmail.com>
Date: Wed, 23 Nov 2022 09:25:01 +0000
Subject: [PATCH] correctly intern `List<Const<'tcx>>`

---
 compiler/rustc_middle/src/ty/context.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index f627dc7ceb1..8cf33a5ca0b 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -137,6 +137,7 @@ pub struct CtxtInterners<'tcx> {
     // Specifically use a speedy hash algorithm for these hash sets, since
     // they're accessed quite often.
     type_: InternedSet<'tcx, WithStableHash<TyS<'tcx>>>,
+    const_lists: InternedSet<'tcx, List<ty::Const<'tcx>>>,
     substs: InternedSet<'tcx, InternalSubsts<'tcx>>,
     canonical_var_infos: InternedSet<'tcx, List<CanonicalVarInfo<'tcx>>>,
     region: InternedSet<'tcx, RegionKind<'tcx>>,
@@ -157,6 +158,7 @@ impl<'tcx> CtxtInterners<'tcx> {
         CtxtInterners {
             arena,
             type_: Default::default(),
+            const_lists: Default::default(),
             substs: Default::default(),
             region: Default::default(),
             poly_existential_predicates: Default::default(),
@@ -2261,6 +2263,7 @@ macro_rules! slice_interners {
 }
 
 slice_interners!(
+    const_lists: _intern_const_list(Const<'tcx>),
     substs: _intern_substs(GenericArg<'tcx>),
     canonical_var_infos: _intern_canonical_var_infos(CanonicalVarInfo<'tcx>),
     poly_existential_predicates:
@@ -2722,7 +2725,7 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     pub fn intern_const_list(self, cs: &[ty::Const<'tcx>]) -> &'tcx List<ty::Const<'tcx>> {
-        if cs.is_empty() { List::empty() } else { List::from_arena(self.arena, cs) }
+        if cs.is_empty() { List::empty() } else { self._intern_const_list(cs) }
     }
 
     pub fn intern_type_list(self, ts: &[Ty<'tcx>]) -> &'tcx List<Ty<'tcx>> {