--- /dev/null
+// build
+
+// Copyright 2016 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.
+
+// This file tests that required algs are generated,
+// even when similar types have been marked elsewhere
+// as not needing algs. See CLs 19769 and 19770.
+
+package main
+
+import "fmt"
+
+//go:noinline
+func f(m map[[8]string]int) int {
+ var k [8]string
+ return m[k]
+}
+
+//go:noinline
+func g(m map[[8]interface{}]int) int {
+ var k [8]interface{}
+ return m[k]
+}
+
+//go:noinline
+func h(m map[[2]string]int) int {
+ var k [2]string
+ return m[k]
+}
+
+type T map[string]interface{}
+
+func v(x ...string) string {
+ return x[0] + x[1]
+}
+
+func main() {
+ fmt.Println(
+ f(map[[8]string]int{}),
+ g(map[[8]interface{}]int{}),
+ h(map[[2]string]int{}),
+ v("a", "b"),
+ )
+}