go cannotassign 源码
golang cannotassign 代码
文件路径：/test/cannotassign.go
// errorcheck
// Copyright 2020 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.
// Test "cannot assign" errors
package main
func main() {
var s string = "hello"
s[1:2] = "a" // ERROR "cannot assign to .* (\(strings are immutable\))?"
s[3] = "b" // ERROR "cannot assign to .* (\(strings are immutable\))?"
const n int = 1
const cs string = "hello"
n = 2 // ERROR "cannot assign to .* (\(declared const\))?"
cs = "hi" // ERROR "cannot assign to .* (\(declared const\))?"
true = false // ERROR "cannot assign to .* (\(declared const\))?"
var m map[int]struct{ n int }
m[0].n = 7 // ERROR "cannot assign to struct field .* in map$"
1 = 7 // ERROR "cannot assign to 1"
"hi" = 7 // ERROR `cannot assign to "hi"`
nil = 7 // ERROR "cannot assign to nil"
len("") = 7 // ERROR `cannot assign to len\(""\)`
[]int{} = nil // ERROR "cannot assign to \[\]int\{\}"
var x int = 7
x + 1 = 7 // ERROR "cannot assign to x \+ 1"
}
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