'main': Fix issue #652.

highlighters/main/main-highlighter.zsh

@@ -547,7 +547,7 @@ _zsh_highlight_main_highlighter_highlight_list()
 
     if [[ $this_word == *:start:* ]] && ! (( in_redirection )); then
       # Expand aliases.
-      _zsh_highlight_main__type "$arg"
+      _zsh_highlight_main__type "$arg" "$(( ! ${+seen_alias[$arg]} ))"
       local res="$REPLY"
       if [[ $res == "alias" ]] && [[ $last_alias != $arg ]]; then
         # Avoid looping forever on alias a=b b=c c=b, but allow alias foo='foo bar'

highlighters/main/test-data/alias-eponymous2.zsh

@@ -32,5 +32,5 @@ alias ls=tmp tmp='command ls'
 BUFFER='ls'
 
 expected_region_highlight=(
-  "1 2 alias 'issue #652'" # ls
+  "1 2 alias" # ls
 )