* enable command lines starting with a hyphen.

highlighters/main/main-highlighter.zsh

@@ -138,7 +138,9 @@ _zsh_highlight_main_highlighter_check_path()
   [[ -z ${(Q)arg} ]] && return 1
   [[ -e ${(Q)arg} ]] && return 0
   [[ ! -e ${(Q)arg:h} ]] && return 1
-  [[ ${#BUFFER} == $end_pos && -n $(print ${(Q)arg}*(N)) ]] && return 0
+  if [[ ${BUFFER[1]} != "-" ]]; then
+    [[ ${#BUFFER} == $end_pos && -n $(print ${(Q)arg}*(N)) ]] && return 0
+  fi 
   return 1
 }