#compdef -K _expand_alias complete-word \C-Xa

if (( ${funcstack[(I)_main_complete]} )); then
  compstate[to_end]=match
  _main_complete _expand_alias
else

  if _expand -a; then
    compstate[insert]=1
    return
  fi

  zstyle -t ":completion:${curcontext}:" complete &&
      _main_complete - expand-alias _aliases
fi