Make Ty wrap TyKind in an Arc

... like it will be in Chalk. We still keep `interned_mut` and
`into_inner` methods that will probably not exist with Chalk.

This worsens performance slightly (5ginstr inference on RA), but doesn't
include other simplifications we can do yet.

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/hir_ty/src/traits/chalk/mapping.rs b/crates/hir_ty/src/traits/chalk/mapping.rs
index 05a4bf0df..2ab976190 100644
--- a/crates/hir_ty/src/traits/chalk/mapping.rs
+++ b/crates/hir_ty/src/traits/chalk/mapping.rs
@@ -24,7 +24,7 @@ use super::*;
 impl ToChalk for Ty {
     type Chalk = chalk_ir::Ty<Interner>;
     fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Ty<Interner> {
-        match self.0 {
+        match self.into_inner() {
             TyKind::Ref(m, parameters) => ref_to_chalk(db, m, parameters),
             TyKind::Array(parameters) => array_to_chalk(db, parameters),
             TyKind::Function(FnPointer { sig, substs, .. }) => {