rustc: Stabilize the WebAssembly wide-arithmetic feature

compiler/rustc_target/src/target_features.rs

@@ -845,7 +845,7 @@ static WASM_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
     ("sign-ext", Stable, &[]),
     ("simd128", Stable, &[]),
     ("tail-call", Stable, &[]),
-    ("wide-arithmetic", Unstable(sym::wasm_target_feature), &[]),
+    ("wide-arithmetic", Stable, &[]),
     // tidy-alphabetical-end
 ];
 

src/doc/rustc/src/platform-support/wasm32v1-none.md

@@ -64,6 +64,8 @@ For reference sake, the set of proposals that LLVM supports at the time of writi
     * [Multiple memories]- `+multimemory`
     * [Relaxed SIMD] - `+relaxed-simd`
     * [Tail call] - `+tail-call`
+* Post-3.0 proposals:
+    * [Wide Arithmetic] - `+wide-arithmetic`
 
 [Bulk memory]: https://github.com/WebAssembly/spec/blob/main/proposals/bulk-memory-operations/Overview.md
 [Sign-extending operations]: https://github.com/WebAssembly/spec/blob/main/proposals/sign-extension-ops/Overview.md
@@ -78,6 +80,7 @@ For reference sake, the set of proposals that LLVM supports at the time of writi
 [Multiple memories]: https://github.com/WebAssembly/multi-memory
 [Relaxed SIMD]: https://github.com/WebAssembly/relaxed-simd
 [Tail call]: https://github.com/WebAssembly/tail-call
+[Wide Arithmetic]: https://github.com/WebAssembly/wide-arithmetic
 
 Additional proposals in the future are, of course, also not enabled by default.
 

tests/ui/wasm/wasm-stable-target-features.rs

@@ -35,6 +35,9 @@ fn foo9() {}
 #[target_feature(enable = "tail-call")]
 fn foo10() {}
 
+#[target_feature(enable = "wide-arithmetic")]
+fn foo11() {}
+
 fn main() {
     foo1();
     foo2();
@@ -46,4 +49,5 @@ fn main() {
     foo8();
     foo9();
     foo10();
+    foo11();
 }