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Feature gate impl_trait_in_fn_trait_return

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Maybe Waffle 2022-07-25 01:54:47 +04:00
parent 00f22771f6
commit cc752f5665
3 changed files with 7 additions and 1 deletions
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5
compiler/rustc_ast_lowering/src/path.rs
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@ -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) => {