Add another test case

Author: camelid

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

@@ -17,4 +17,9 @@ pub fn foo() {}
 //~| WARN
 //~| ERROR unknown `doc` attribute
 //~| WARN
+#[doc(foo::bar, crate::bar::baz = "bye")]
+//~^ ERROR unknown `doc` attribute
+//~| WARN
+//~| ERROR unknown `doc` attribute
+//~| WARN
 fn bar() {}

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

@@ -40,6 +40,24 @@ LL | #[doc("hello", "bar")]
    = 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 ``
+  --> $DIR/doc-attr.rs:20:7
+   |
+LL | #[doc(foo::bar, crate::bar::baz = "bye")]
+   |       ^^^^^^^^
+   |
+   = 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 ``
+  --> $DIR/doc-attr.rs:20:17
+   |
+LL | #[doc(foo::bar, crate::bar::baz = "bye")]
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = 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:3:8
    |
@@ -49,5 +67,5 @@ 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 5 previous errors
+error: aborting due to 7 previous errors