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+// 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"
+}