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Source file test/sliceopt.go

Documentation: test

     1  // errorcheck -0 -d=append,slice
     2  
     3  // Copyright 2015 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Check optimization results for append and slicing.
     8  
     9  package main
    10  
    11  func a1(x []int, y int) []int {
    12  	x = append(x, y) // ERROR "append: len-only update \(in local slice\)$"
    13  	return x
    14  }
    15  
    16  func a2(x []int, y int) []int {
    17  	return append(x, y)
    18  }
    19  
    20  func a3(x *[]int, y int) {
    21  	*x = append(*x, y) // ERROR "append: len-only update$"
    22  }
    23  
    24  func s1(x **[]int, xs **string, i, j int) {
    25  	var z []int
    26  	z = (**x)[0:] // ERROR "slice: omit slice operation$"
    27  	println(z)
    28  
    29  	var zs string
    30  	zs = (**xs)[0:] // ERROR "slice: omit slice operation$"
    31  	println(zs)
    32  }
    33  

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