diff --git a/src/_multirust b/src/_multirust
deleted file mode 100644
index 00deb67..0000000
--- a/src/_multirust
+++ /dev/null
@@ -1,163 +0,0 @@
-#compdef multirust
-# ------------------------------------------------------------------------------
-# Copyright (C) 2016 by Hideo Hattori <hhatto.jp@gmail.com>
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
-# ------------------------------------------------------------------------------
-# Description
-# -----------
-#
-#  Completion script for multirust (https://github.com/brson/multirust).
-#
-# ------------------------------------------------------------------------------
-# Authors
-# -------
-#
-#  * Hideo Hattori (https://github.com/hhatto)
-#
-# ------------------------------------------------------------------------------
-
-_multirust() {
-  typeset -A opt_args
-  local context state line
-
-  _arguments -s -S \
-    "--verbose[run verbosely]" \
-    "--version[print version info]" \
-    "*::multirust commands:_multirust_command"
-}
-
-(( $+functions[_multirust_command] )) ||
-_multirust_command() {
-  local cmd ret=1
-
-  (( $+multirust_cmds )) || _multirust_cmds=(
-    "default:Set the default toolchain" \
-    "override:Set the toolchain override for the current directory tree" \
-    "update:Install or update a given toolchain" \
-    "show-override:Show information about the current override" \
-    "show-default:Show information about the current default" \
-    "list-overrides:List all overrides" \
-    "list-toolchains:List all installed toolchains" \
-    "remove-override:Remove an override, for current directory unless specified" \
-    "remove-toolchain:Uninstall a toolchain" \
-    "run:Run a command in an environment configured for a toolchain" \
-    "delete-data:Delete all user metadata, including installed toolchains" \
-    "upgrade-data:Upgrade the ~/.multirust directory from previous versions" \
-    "doc:Open the documentation for the currently active toolchain" \
-    "which:Report location of the currently active Rust tool." \
-    "help:Show help for this command or subcommands" \
-    )
-
-  if (( CURRENT == 1 )); then
-    _describe -t commands 'multirust subcommand' _multirust_cmds || compadd "$@" - ${(s.:.)${(j.:.)_multirust_syns}}
-  else
-    local curcontext="$curcontext"
-
-    cmd="${${_multirust_cmds[(r)$words[1]:*]%%:*}:-${(k)_multirust_syns[(r)(*:|)$words[1](:*|)]}}"
-    if (( $#cmd )); then
-      curcontext="${curcontext%:*:*}:multirust-${cmd}:"
-      _call_function ret _multirust_$cmd || _message 'no more arguments'
-    else
-      _message "unknown multirust command: $words[1]"
-      fi
-    return ret
-  fi
-}
-
-(( $+functions[_multirust_default] )) ||
-_multirust_default() {
-  _arguments -s \
-    "--copy-local[install by copying a local toolchain]:PATH:_gnu_generic::" \
-    "--link-local[install by linking a local toolchain]:PATH:_gnu_generic::" \
-    "--installer[allows arbitrary builds of rust to be installed from a custom-built installer]:PATH:_gnu_generic::" \
-    "*::multirust commands:_multirust"
-}
-
-(( $+functions[_multirust_override] )) ||
-_multirust_override() {
-  _multirust_default
-}
-
-(( $+functions[_multirust_update] )) ||
-_multirust_update() {
-  _multirust_default
-}
-
-__overrides() {
-  declare -a overrides
-  overrides=($(multirust list-overrides|awk -F";" '{print $1":"$2}'))
-  _describe 'override' overrides
-}
-
-__toolchains() {
-  declare -a toolchains
-  toolchains=($(multirust list-toolchains))
-  _describe "toolchain" toolchains
-}
-
-__subcommands() {
-  declare -a cmds
-  cmds=($(multirust|grep "#    "|awk '{print $2}'))
-  _describe "command" cmds
-}
-
-(( $+functions[_multirust_remove-override] )) ||
-_multirust_remove-override() {
-  __overrides
-}
-
-(( $+functions[_multirust_remove-toolchain] )) ||
-_multirust_remove-toolchain() {
-  __toolchains
-}
-
-(( $+functions[_multirust_run] )) ||
-_multirust_run() {
-  __toolchains
-}
-
-(( $+functions[_multirust_delete-data] )) ||
-_multirust_delete-data() {
-  _arguments -s \
-    "-y[Disable prompt]" \
-    "*::multirust commands:_multirust"
-}
-
-(( $+functions[_multirust_doc] )) ||
-_multirust_doc() {
-  _arguments -s \
-    "--all[open the documentation overview page, which gives access to all the installed documentation]:" \
-    "*::multirust commands:_multirust"
-}
-
-(( $+functions[_multirust_help] )) ||
-_multirust_help() {
-  __subcommands
-}
-
-_multirust "$@"
-
-# Local Variables:
-# mode: Shell-Script
-# sh-indentation: 2
-# indent-tabs-mode: nil
-# sh-basic-offset: 2
-# End:
-# vim: ft=zsh sw=2 ts=2 et