Auto merge of #121069 - cuviper:beta-next, r=cuviper

[beta] backports

- Correct paths for hexagon-unknown-none-elf platform doc #120533
- CI: Use ninja on apple builders #120543
- Correctly check `never_type` feature gating #120552
- Revert unsound libcore changes of 119911 #120562

r? cuviper

.github/workflows/ci.yml

@@ -319,7 +319,7 @@ jobs:
           - name: dist-x86_64-apple
             env:
               SCRIPT: "./x.py dist bootstrap --include-default-paths --host=x86_64-apple-darwin --target=x86_64-apple-darwin"
-              RUST_CONFIGURE_ARGS: "--enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false --set rust.lto=thin"
+              RUST_CONFIGURE_ARGS: "--enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set rust.lto=thin"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.12
               SELECT_XCODE: /Applications/Xcode_13.4.1.app
@@ -332,7 +332,7 @@ jobs:
           - name: dist-apple-various
             env:
               SCRIPT: "./x.py dist bootstrap --include-default-paths --host='' --target=aarch64-apple-ios,x86_64-apple-ios,aarch64-apple-ios-sim"
-              RUST_CONFIGURE_ARGS: "--enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
+              RUST_CONFIGURE_ARGS: "--enable-sanitizers --enable-profiler --set rust.jemalloc"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.12
               SELECT_XCODE: /Applications/Xcode_13.4.1.app
@@ -343,7 +343,7 @@ jobs:
           - name: x86_64-apple-1
             env:
               SCRIPT: "./x.py --stage 2 test --skip tests/ui --skip tests/rustdoc --skip tests/run-make-fulldeps"
-              RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
+              RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.12
               MACOSX_STD_DEPLOYMENT_TARGET: 10.12
@@ -354,7 +354,7 @@ jobs:
           - name: x86_64-apple-2
             env:
               SCRIPT: "./x.py --stage 2 test tests/ui tests/rustdoc tests/run-make-fulldeps"
-              RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
+              RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.12
               MACOSX_STD_DEPLOYMENT_TARGET: 10.12
@@ -365,7 +365,7 @@ jobs:
           - name: dist-aarch64-apple
             env:
               SCRIPT: "./x.py dist bootstrap --include-default-paths --stage 2"
-              RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --host=aarch64-apple-darwin --target=aarch64-apple-darwin --enable-full-tools --enable-sanitizers --enable-profiler --disable-docs --set rust.jemalloc --set llvm.ninja=false"
+              RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --host=aarch64-apple-darwin --target=aarch64-apple-darwin --enable-full-tools --enable-sanitizers --enable-profiler --disable-docs --set rust.jemalloc"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               SELECT_XCODE: /Applications/Xcode_13.4.1.app
               USE_XCODE_CLANG: 1

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -362,6 +362,19 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
         }
     }
 
+    fn visit_generic_args(&mut self, args: &'a ast::GenericArgs) {
+        // This check needs to happen here because the never type can be returned from a function,
+        // but cannot be used in any other context. If this check was in `visit_fn_ret_ty`, it
+        // include both functions and generics like `impl Fn() -> !`.
+        if let ast::GenericArgs::Parenthesized(generic_args) = args
+            && let ast::FnRetTy::Ty(ref ty) = generic_args.output
+            && matches!(ty.kind, ast::TyKind::Never)
+        {
+            gate!(&self, never_type, ty.span, "the `!` type is experimental");
+        }
+        visit::walk_generic_args(self, args);
+    }
+
     fn visit_expr(&mut self, e: &'a ast::Expr) {
         match e.kind {
             ast::ExprKind::TryBlock(_) => {

library/core/src/lib.rs

@@ -200,7 +200,6 @@
 //
 // Language features:
 // tidy-alphabetical-start
-#![cfg_attr(not(bootstrap), feature(is_val_statically_known))]
 #![feature(abi_unadjusted)]
 #![feature(adt_const_params)]
 #![feature(allow_internal_unsafe)]