Improve `AdtDef` interning.

This commit makes `AdtDef` use `Interned`. Much the commit is tedious
changes to introduce getter functions. The interesting changes are in
`compiler/rustc_middle/src/ty/adt.rs`.

1 files changed, 4 insertions, 4 deletions

diff --git a/compiler/rustc_const_eval/src/const_eval/mod.rs b/compiler/rustc_const_eval/src/const_eval/mod.rs
index c49c5ecac26..6fd7f707e7e 100644
--- a/compiler/rustc_const_eval/src/const_eval/mod.rs
+++ b/compiler/rustc_const_eval/src/const_eval/mod.rs
@@ -105,13 +105,13 @@ fn const_to_valtree_inner<'tcx>(
         ty::Array(_, len) => branches(usize::try_from(len.eval_usize(ecx.tcx.tcx, ecx.param_env)).unwrap(), None),
 
         ty::Adt(def, _) => {
-            if def.variants.is_empty() {
+            if def.variants().is_empty() {
                 bug!("uninhabited types should have errored and never gotten converted to valtree")
             }
 
             let variant = ecx.read_discriminant(&place.into()).unwrap().1;
 
-            branches(def.variants[variant].fields.len(), def.is_enum().then_some(variant))
+            branches(def.variant(variant).fields.len(), def.is_enum().then_some(variant))
         }
 
         ty::Never
@@ -150,11 +150,11 @@ pub(crate) fn try_destructure_const<'tcx>(
         // Checks if we have any variants, to avoid downcasting to a non-existing variant (when
         // there are no variants `read_discriminant` successfully returns a non-existing variant
         // index).
-        ty::Adt(def, _) if def.variants.is_empty() => throw_ub!(Unreachable),
+        ty::Adt(def, _) if def.variants().is_empty() => throw_ub!(Unreachable),
         ty::Adt(def, _) => {
             let variant = ecx.read_discriminant(&op)?.1;
             let down = ecx.operand_downcast(&op, variant)?;
-            (def.variants[variant].fields.len(), Some(variant), down)
+            (def.variant(variant).fields.len(), Some(variant), down)
         }
         ty::Tuple(substs) => (substs.len(), None, op),
         _ => bug!("cannot destructure constant {:?}", val),