From 845a027ddb3750bb841d0676b7eb460b7c1a2f9d Mon Sep 17 00:00:00 2001 From: Nilstrieb <48135649+Nilstrieb@users.noreply.github.com> Date: Sun, 24 Sep 2023 10:47:31 +0200 Subject: [PATCH] Add comment about RTN feature gating --- compiler/rustc_ast_passes/src/feature_gate.rs | 3 +++ 1 file changed, 3 insertions(+) diff --git a/compiler/rustc_ast_passes/src/feature_gate.rs b/compiler/rustc_ast_passes/src/feature_gate.rs index 3b80751698bcf..62dc7ae58a2f0 100644 --- a/compiler/rustc_ast_passes/src/feature_gate.rs +++ b/compiler/rustc_ast_passes/src/feature_gate.rs @@ -592,6 +592,9 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) { gate_all_legacy_dont_use!(trait_alias, "trait aliases are experimental"); gate_all_legacy_dont_use!(associated_type_bounds, "associated type bounds are unstable"); + // Despite being a new feature, `where T: Trait`, which is RTN syntax now, + // used to be gated under associated_type_bounds, which are right above, so RTN needs to + // be too. gate_all_legacy_dont_use!(return_type_notation, "return type notation is experimental"); gate_all_legacy_dont_use!(decl_macro, "`macro` is experimental"); gate_all_legacy_dont_use!(box_patterns, "box pattern syntax is experimental");