Stabilize associated type bounds

Author: compiler-errors

compiler/rustc_ast/src/lib.rs

@@ -11,7 +11,7 @@
 #![doc(rust_logo)]
 #![allow(internal_features)]
 #![feature(rustdoc_internals)]
-#![feature(associated_type_bounds)]
+#![cfg_attr(bootstrap, feature(associated_type_bounds))]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -457,13 +457,6 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
                     constraint.span,
                     "return type notation is experimental"
                 );
-            } else {
-                gate!(
-                    &self,
-                    associated_type_bounds,
-                    constraint.span,
-                    "associated type bounds are unstable"
-                );
             }
         }
         visit::walk_assoc_constraint(self, constraint)
@@ -608,7 +601,6 @@ 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<Assoc(): Sized>`, which is RTN syntax now,
     // used to be gated under associated_type_bounds, which are right above, so RTN needs to
     // be too.

compiler/rustc_borrowck/src/lib.rs

@@ -4,7 +4,7 @@
 #![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
-#![feature(associated_type_bounds)]
+#![cfg_attr(bootstrap, feature(associated_type_bounds))]
 #![feature(box_patterns)]
 #![feature(let_chains)]
 #![feature(min_specialization)]

compiler/rustc_codegen_gcc/src/lib.rs

@@ -18,11 +18,11 @@
 #![feature(
     rustc_private,
     decl_macro,
-    associated_type_bounds,
     never_type,
     trusted_len,
     hash_raw_entry
 )]
+#![cfg_attr(bootstrap, feature(associated_type_bounds))]
 #![allow(broken_intra_doc_links)]
 #![recursion_limit="256"]
 #![warn(rust_2018_idioms)]

compiler/rustc_codegen_ssa/src/lib.rs

@@ -4,7 +4,7 @@
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![feature(associated_type_bounds)]
+#![cfg_attr(bootstrap, feature(associated_type_bounds))]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]

compiler/rustc_error_codes/src/error_codes/E0719.md

@@ -3,8 +3,6 @@ An associated type value was specified more than once.
 Erroneous code example:
 
 ```compile_fail,E0719
-#![feature(associated_type_bounds)]
-
 trait FooTrait {}
 trait BarTrait {}
 
@@ -19,8 +17,6 @@ specify the associated type with the new trait.
 Corrected example:
 
 ```
-#![feature(associated_type_bounds)]
-
 trait FooTrait {}
 trait BarTrait {}
 trait FooBarTrait: FooTrait + BarTrait {}

compiler/rustc_expand/src/lib.rs

@@ -1,7 +1,7 @@
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
 #![feature(array_windows)]
-#![feature(associated_type_bounds)]
+#![cfg_attr(bootstrap, feature(associated_type_bounds))]
 #![feature(associated_type_defaults)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]

compiler/rustc_feature/src/accepted.rs

@@ -59,6 +59,8 @@ declare_features! (
     (accepted, asm_sym, "1.66.0", Some(93333)),
     /// Allows the definition of associated constants in `trait` or `impl` blocks.
     (accepted, associated_consts, "1.20.0", Some(29646)),
+    /// Allows the user of associated type bounds.
+    (accepted, associated_type_bounds, "CURRENT_RUSTC_VERSION", Some(52662)),
     /// Allows using associated `type`s in `trait`s.
     (accepted, associated_types, "1.0.0", None),
     /// Allows free and inherent `async fn`s, `async` blocks, and `<expr>.await` expressions.

compiler/rustc_feature/src/unstable.rs

@@ -349,8 +349,6 @@ declare_features! (
     (unstable, asm_unwind, "1.58.0", Some(93334)),
     /// Allows users to enforce equality of associated constants `TraitImpl<AssocConst=3>`.
     (unstable, associated_const_equality, "1.58.0", Some(92827)),
-    /// Allows the user of associated type bounds.
-    (unstable, associated_type_bounds, "1.34.0", Some(52662)),
     /// Allows associated type defaults.
     (unstable, associated_type_defaults, "1.2.0", Some(29661)),
     /// Allows `async || body` closures.

compiler/rustc_infer/src/lib.rs

@@ -18,7 +18,7 @@
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![feature(associated_type_bounds)]
+#![cfg_attr(bootstrap, feature(associated_type_bounds))]
 #![feature(box_patterns)]
 #![feature(extend_one)]
 #![feature(let_chains)]