No need for helper in trailer_expr attribute handling

src/expr.rs

@@ -1524,15 +1524,15 @@ pub(crate) mod parsing {
     // <atom> ? ...
     #[cfg(feature = "full")]
     fn trailer_expr(
-        outer_attrs: Vec<Attribute>,
+        mut attrs: Vec<Attribute>,
         input: ParseStream,
         allow_struct: AllowStruct,
     ) -> Result<Expr> {
         let atom = atom_expr(input, allow_struct)?;
         let mut e = trailer_helper(input, atom)?;
 
         let inner_attrs = e.replace_attrs(Vec::new());
-        let attrs = private::attrs(outer_attrs, inner_attrs);
+        attrs.extend(inner_attrs);
         e.replace_attrs(attrs);
         Ok(e)
     }