semantic highlighting: add reference hlmod

crates/hir/src/lib.rs

@@ -1840,6 +1840,11 @@ impl Local {
         matches!(&body[self.pat_id], Pat::Bind { mode: BindingAnnotation::Mutable, .. })
     }
 
+    pub fn is_ref(self, db: &dyn HirDatabase) -> bool {
+        let body = db.body(self.parent);
+        matches!(&body[self.pat_id], Pat::Bind { mode: BindingAnnotation::Ref, .. })
+    }
+
     pub fn parent(self, _db: &dyn HirDatabase) -> DefWithBody {
         self.parent.into()
     }
@@ -2195,6 +2200,10 @@ impl Type {
         matches!(self.ty.kind(&Interner), TyKind::Ref(hir_ty::Mutability::Mut, ..))
     }
 
+    pub fn is_reference(&self) -> bool {
+        matches!(self.ty.kind(&Interner), TyKind::Ref(hir_ty::Mutability::Not, ..))
+    }
+
     pub fn is_usize(&self) -> bool {
         matches!(self.ty.kind(&Interner), TyKind::Scalar(Scalar::Uint(UintTy::Usize)))
     }