1 files changed, 41 insertions, 0 deletions
diff --git a/test/typeparam/subdict.go b/test/typeparam/subdict.go
new file mode 100644
index 0000000000..b4e84baf8a
--- /dev/null
+++ b/test/typeparam/subdict.go
@@ -0,0 +1,41 @@
+// run -gcflags=-G=3
+
+// Copyright 2021 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 cases where a main dictionary is needed inside a generic function/method, because
+// we are calling a method on a fully-instantiated type or a fully-instantiated function.
+// (probably not common situations, of course)
+
+package main
+
+import (
+	"fmt"
+)
+
+type value[T comparable] struct {
+	val T
+}
+
+func (v *value[T]) test(def T) bool {
+	return (v.val == def)
+}
+
+func (v *value[T]) get(def T) T {
+	var c value[int]
+	if c.test(32) {
+		return def
+	} else if v.test(def) {
+		return def
+	} else {
+		return v.val
+	}
+}
+
+func main() {
+	var s value[string]
+	if got, want := s.get("ab"), ""; got != want {
+		panic(fmt.Sprintf("get() == %d, want %d", got, want))
+	}
+}