Rollup merge of #157023 - samueltardieu:push-mwykwuslpolq, r=nnethercote

`#[expect]` is an attribute valid for outer style

compiler/rustc_ast/src/ast.rs

@@ -3497,6 +3497,7 @@ pub fn is_valid_for_outer_style(&self) -> bool {
             || self.path == sym::warn
             || self.path == sym::allow
             || self.path == sym::deny
+            || self.path == sym::expect
     }
 }
 

tests/ui/parser/const-block-items/inner-attr.stderr

@@ -8,6 +8,11 @@ LL | fn main() {}
    | ------------ the inner attribute doesn't annotate this function
    |
    = note: inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files
+help: to annotate the function, change the attribute from inner to outer style
+   |
+LL -     #![expect(unused)]
+LL +     #[expect(unused)]
+   |
 
 error: aborting due to 1 previous error