Auto merge of #41145 - matthewjasper:stabilize-relaxed-adts, r=petrochenkov

Stabilize rfc 1506 - Clarified ADT Kinds

Closes #35626

Documentation:

- [ ] Reference rust-lang-nursery/reference#37
- [ ] Book?
- [ ] Rust by example?

src/test/compile-fail/numeric-fields-feature-gate.rs

@@ -1,20 +0,0 @@
-// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// gate-test-relaxed_adts
-
-struct S(u8);
-
-fn main() {
-    let s = S{0: 10}; //~ ERROR numeric fields in struct expressions are unstable
-    match s {
-        S{0: a, ..} => {} //~ ERROR numeric fields in struct patterns are unstable
-    }
-}

src/test/compile-fail/numeric-fields.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(relaxed_adts)]
-
 struct S(u8, u16);
 
 fn main() {