1 files changed, 60 insertions, 0 deletions
diff --git a/test/typeparam/issue48538.go b/test/typeparam/issue48538.go
new file mode 100644
index 0000000..985f84e
--- /dev/null
+++ b/test/typeparam/issue48538.go
@@ -0,0 +1,60 @@
+// compile
+
+// 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.
+
+// Testing composite literal for a type param constrained to be a struct or a map.
+
+package p
+
+type C interface {
+	~struct{ b1, b2 string }
+}
+
+func f[T C]() T {
+	return T{
+		b1: "a",
+		b2: "b",
+	}
+}
+
+func f2[T ~struct{ b1, b2 string }]() T {
+	return T{
+		b1: "a",
+		b2: "b",
+	}
+}
+
+type D interface {
+	map[string]string | S
+}
+
+type S map[string]string
+
+func g[T D]() T {
+	b1 := "foo"
+	b2 := "bar"
+	return T{
+		b1: "a",
+		b2: "b",
+	}
+}
+
+func g2[T map[string]string]() T {
+	b1 := "foo"
+	b2 := "bar"
+	return T{
+		b1: "a",
+		b2: "b",
+	}
+}
+
+func g3[T S]() T {
+	b1 := "foo"
+	b2 := "bar"
+	return T{
+		b1: "a",
+		b2: "b",
+	}
+}