Only expand types that contain projections

rust-lang · Oct 14, 2019 · 802554f · 802554f
1 parent fe09bb5
commit 802554f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/librustc/ty/util.rs b/src/librustc/ty/util.rs
@@ -745,8 +745,10 @@ impl<'tcx> TyCtxt<'tcx> {
             fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
                 if let ty::Opaque(def_id, substs) = t.kind {
                     self.expand_opaque_ty(def_id, substs).unwrap_or(t)
-                } else {
+                } else if t.has_projections() {
                     t.super_fold_with(self)
+                } else {
+                    t
                 }
             }
         }