Initial commit: Go 1.23 release state

test/cannotassign.go

@@ -0,0 +1,33 @@
+// 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"
+}