Initial commit: Go 1.23 release state

test/typeparam/issue48609.go

@@ -0,0 +1,16 @@
+// 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.
+
+package p
+
+func f[T ~chan E, E any](e E) T {
+	ch := make(T)
+	go func() {
+		defer close(ch)
+		ch <- e
+	}()
+	return ch
+}