internal: intern `TypeBound`s

Doesn't save much memory (~2 mb), but interning things is generally a
good pattern to follow

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/hir/src/display.rs b/crates/hir/src/display.rs
index 508ac37c2..c5cf803fd 100644
--- a/crates/hir/src/display.rs
+++ b/crates/hir/src/display.rs
@@ -92,7 +92,7 @@ impl HirDisplay for Function {
             &data.ret_type
         } else {
             match &*data.ret_type {
-                TypeRef::ImplTrait(bounds) => match &bounds[0] {
+                TypeRef::ImplTrait(bounds) => match bounds[0].as_ref() {
                     TypeBound::Path(path) => {
                         path.segments().iter().last().unwrap().args_and_bindings.unwrap().bindings
                             [0]