Rollup merge of #82598 - GuillaumeGomez:rustdoc-rustc-pass, r=jyn514

Check stability and feature attributes in rustdoc

Fixes #82588.

cc `@Nemo157` `@camelid`
r? `@jyn514`

Author: GuillaumeGomez

library/std/src/os/mod.rs

@@ -23,6 +23,7 @@ pub use crate::sys::windows_ext as windows;
 pub mod linux;
 
 #[cfg(doc)]
+#[stable(feature = "wasi_ext_doc", since = "1.35.0")]
 pub use crate::sys::wasi_ext as wasi;
 
 // If we're not documenting libstd then we just expose the main modules as we otherwise would.

library/std/src/sys/mod.rs

@@ -111,7 +111,7 @@ cfg_if::cfg_if! {
 cfg_if::cfg_if! {
     if #[cfg(target_os = "wasi")] {
         // On WASI we'll document what's already available
-        #[stable(feature = "rust1", since = "1.0.0")]
+        #[stable(feature = "wasi_ext_doc", since = "1.35.0")]
         pub use self::ext as wasi_ext;
     } else if #[cfg(any(target_os = "hermit",
                         target_arch = "wasm32",
@@ -125,6 +125,7 @@ cfg_if::cfg_if! {
     } else {
         // On other platforms like Windows document the bare bones of WASI
         #[path = "wasi/ext/mod.rs"]
+        #[stable(feature = "wasi_ext_doc", since = "1.35.0")]
         pub mod wasi_ext;
     }
 }

src/librustdoc/core.rs

@@ -491,6 +491,7 @@ crate fn run_global_ctxt(
             tcx.ensure().check_mod_attrs(module);
         }
     });
+    rustc_passes::stability::check_unused_or_stable_features(tcx);
 
     let access_levels = tcx.privacy_access_levels(LOCAL_CRATE);
     // Convert from a HirId set to a DefId set since we don't always have easy access

src/librustdoc/lib.rs

@@ -49,6 +49,7 @@ extern crate rustc_metadata;
 extern crate rustc_middle;
 extern crate rustc_mir;
 extern crate rustc_parse;
+extern crate rustc_passes;
 extern crate rustc_resolve;
 extern crate rustc_session;
 extern crate rustc_span as rustc_span;

src/test/rustdoc-ui/rustc-check-passes.rs

@@ -0,0 +1,4 @@
+#![feature(box_syntax)]
+#![feature(box_syntax)] //~ ERROR
+
+pub fn foo() {}

src/test/rustdoc-ui/rustc-check-passes.stderr

@@ -0,0 +1,9 @@
+error[E0636]: the feature `box_syntax` has already been declared
+  --> $DIR/rustc-check-passes.rs:2:12
+   |
+LL | #![feature(box_syntax)]
+   |            ^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0636`.

src/test/rustdoc/implementor-stable-version.rs

@@ -1,3 +1,4 @@
+#![stable(feature = "bar", since = "OLD 1.0")]
 #![crate_name = "foo"]
 
 #![feature(staged_api)]
@@ -8,6 +9,7 @@ pub trait Bar {}
 #[stable(feature = "baz", since = "OLD 1.0")]
 pub trait Baz {}
 
+#[stable(feature = "baz", since = "OLD 1.0")]
 pub struct Foo;
 
 // @has foo/trait.Bar.html '//div[@id="implementors-list"]//span[@class="since"]' 'NEW 2.0'