go source for verification 2026-05-22

test/fixedbugs/issue4620.go

@@ -0,0 +1,21 @@
+// run
+
+// Copyright 2013 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.
+
+// Issue 4620: map indexes are not evaluated before assignment of other elements
+
+package main
+
+import "fmt"
+
+func main() {
+	m := map[int]int{0:1}
+	i := 0
+	i, m[i] = 1, 2
+	if m[0] != 2 {
+		fmt.Println(m)
+		panic("m[i] != 2")
+	}
+}