You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: internal.go
    path of file: ./repos/corteza/server/vendor/google.golang.org/appengine/internal
    
    the code of the file until where you have to start completion: // Copyright 2011 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

// Package internal provides support for package appengine.
//
// Programs should not use this package directly. Its API is not stable.
// Use packages appengine and appengine/* instead.
package internal

import (
	"fmt"

	"github.com/
    
func (e *CallError) Error() string {
	var msg string
	switch remotepb.RpcError_ErrorCode(e.Code) {
	case remotepb.RpcError_UNKNOWN:
		return e.Detail
	case remotepb.RpcError_OVER_QUOTA:
		msg = "Over quota"
	case remotepb.RpcError_CAPABILITY_DISABLED:
		msg = "Capability disabled"
	case remotepb.RpcError_CANCELLED:
		msg = "Canceled"
	default:
		msg = fmt.Sprintf("Call error %d", e.Code)
	}
	s := msg + ": " + e.Detail
	if e.Timeout {
		s += " (timeout)"
	}
	return s
}