go source for verification 2026-05-22

test/fixedbugs/issue4251.go

@@ -0,0 +1,21 @@
+// errorcheck
+
+// Copyright 2012 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 4251: slice with inverted range is an error.
+
+package p
+
+func F1(s []byte) []byte {
+	return s[2:1]		// ERROR "invalid slice index|inverted slice range|invalid slice indices"
+}
+
+func F2(a [10]byte) []byte {
+	return a[2:1]		// ERROR "invalid slice index|inverted slice range|invalid slice indices"
+}
+
+func F3(s string) string {
+	return s[2:1]		// ERROR "invalid slice index|inverted slice range|invalid slice indices"
+}