Also use INVALID_DOC_ATTRIBUTE for "unknown doc attribute" warnings

Author: GuillaumeGomez

compiler/rustc_passes/src/check_attr.rs

@@ -585,19 +585,14 @@ impl CheckAttrVisitor<'tcx> {
                         .any(|m| i_meta.has_name(*m))
                         {
                             self.tcx.struct_span_lint_hir(
-                                UNUSED_ATTRIBUTES,
+                                INVALID_DOC_ATTRIBUTE,
                                 hir_id,
                                 i_meta.span,
                                 |lint| {
                                     lint.build(&format!(
                                         "unknown `doc` attribute `{}`",
                                         i_meta.name_or_empty()
                                     ))
-                                    .warn(
-                                        "this was previously accepted by the compiler but is \
-                                        being phased out; it will become a hard error in \
-                                        a future release!",
-                                    )
                                     .emit();
                                 },
                             );

src/test/rustdoc-ui/doc-attr.rs

@@ -1,11 +1,10 @@
 #![crate_type = "lib"]
-#![deny(unused_attributes)]
-//~^ NOTE lint level is defined here
+#![deny(warnings)]
 #![doc(as_ptr)]
 //~^ ERROR unknown `doc` attribute
-//~| WARNING will become a hard error in a future release
+//~^^ WARN
 
 #[doc(as_ptr)]
 //~^ ERROR unknown `doc` attribute
-//~| WARNING will become a hard error in a future release
+//~^^ WARN
 pub fn foo() {}

src/test/rustdoc-ui/doc-attr.stderr

@@ -1,23 +1,26 @@
 error: unknown `doc` attribute `as_ptr`
-  --> $DIR/doc-attr.rs:8:7
+  --> $DIR/doc-attr.rs:7:7
    |
 LL | #[doc(as_ptr)]
    |       ^^^^^^
    |
 note: the lint level is defined here
   --> $DIR/doc-attr.rs:2:9
    |
-LL | #![deny(unused_attributes)]
-   |         ^^^^^^^^^^^^^^^^^
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(invalid_doc_attribute)]` implied by `#[deny(warnings)]`
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
 
 error: unknown `doc` attribute `as_ptr`
-  --> $DIR/doc-attr.rs:4:8
+  --> $DIR/doc-attr.rs:3:8
    |
 LL | #![doc(as_ptr)]
    |        ^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
 
 error: aborting due to 2 previous errors
 

src/test/ui/attributes/doc-attr.rs

@@ -1,11 +1,10 @@
 #![crate_type = "lib"]
-#![deny(unused_attributes)]
-//~^ NOTE lint level is defined here
+#![deny(warnings)]
 #![doc(as_ptr)]
 //~^ ERROR unknown `doc` attribute
-//~| WARNING will become a hard error in a future release
+//~^^ WARN
 
 #[doc(as_ptr)]
 //~^ ERROR unknown `doc` attribute
-//~| WARNING will become a hard error in a future release
+//~^^ WARN
 pub fn foo() {}

src/test/ui/attributes/doc-attr.stderr

@@ -1,23 +1,26 @@
 error: unknown `doc` attribute `as_ptr`
-  --> $DIR/doc-attr.rs:8:7
+  --> $DIR/doc-attr.rs:7:7
    |
 LL | #[doc(as_ptr)]
    |       ^^^^^^
    |
 note: the lint level is defined here
   --> $DIR/doc-attr.rs:2:9
    |
-LL | #![deny(unused_attributes)]
-   |         ^^^^^^^^^^^^^^^^^
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(invalid_doc_attribute)]` implied by `#[deny(warnings)]`
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
 
 error: unknown `doc` attribute `as_ptr`
-  --> $DIR/doc-attr.rs:4:8
+  --> $DIR/doc-attr.rs:3:8
    |
 LL | #![doc(as_ptr)]
    |        ^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
 
 error: aborting due to 2 previous errors