| // errorcheck | 
 |  | 
 | // Copyright 2016 The Go Authors.  All rights reserved. | 
 | // Use of this source code is governed by a BSD-style | 
 | // license that can be found in the LICENSE file. | 
 |  | 
 | package p | 
 |  | 
 | var a []int = []int{1: 1} | 
 | var b []int = []int{-1: 1} // ERROR "must be non-negative integer constant" | 
 |  | 
 | var c []int = []int{2.0: 2} | 
 | var d []int = []int{-2.0: 2} // ERROR "must be non-negative integer constant" | 
 |  | 
 | var e []int = []int{3 + 0i: 3} | 
 | var f []int = []int{3i: 3} // ERROR "truncated to integer" | 
 |  | 
 | var g []int = []int{"a": 4} // ERROR "must be non-negative integer constant" |