Feature gate impl_trait_in_fn_trait_return

2022-07-25 01:54:47 +04:00
parent 00f22771f6
commit cc752f5665
3 changed files with 7 additions and 1 deletions
--- a/compiler/rustc_ast_lowering/src/path.rs
+++ b/compiler/rustc_ast_lowering/src/path.rs
@@ -363,7 +363,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
            // fn f(_: impl Fn() -> impl Debug) -> impl Fn() -> impl Debug
            // //      disallowed --^^^^^^^^^^        allowed --^^^^^^^^^^
            // ```
-            FnRetTy::Ty(ty) if matches!(itctx, ImplTraitContext::ReturnPositionOpaqueTy { .. }) => {
+            FnRetTy::Ty(ty)
+                if matches!(itctx, ImplTraitContext::ReturnPositionOpaqueTy { .. })
+                    && self.tcx.features().impl_trait_in_fn_trait_return =>
+            {
                self.lower_ty(&ty, itctx)
            }
            FnRetTy::Ty(ty) => {