update regexes used in rust-top-item-beg-re

Author: brotzeit

rust-mode.el

@@ -267,15 +267,15 @@ Use idomenu (imenu with `ido-mode') for best mileage.")
 (add-to-list 'auto-mode-alist '("\\.rs\\'" . rust-mode))
 
 (defvar rust-top-item-beg-re
-  (concat "\\s-*"
+  (concat "\\s-*\\(?:priv\\|pub\\)?\\s-*"
           ;; TODO some of this does only make sense for `fn' (unsafe, extern...)
           ;; and not other items
           (rust-re-shy (concat (rust-re-shy rust-re-vis) "[[:space:]]+")) "?"
           (rust-re-shy (concat (rust-re-shy rust-re-async-or-const) "[[:space:]]+")) "?"
           (rust-re-shy (concat (rust-re-shy rust-re-unsafe) "[[:space:]]+")) "?"
           (regexp-opt
            '("enum" "struct" "union" "type" "mod" "use" "fn" "static" "impl"
-             "extern" "trait"))
+             "extern" "trait" "async"))
           "\\_>")
   "Start of a Rust item.")