go source for verification 2026-05-22

test/fixedbugs/issue20174.go

@@ -0,0 +1,18 @@
+// compile -c=2
+
+// Copyright 2017 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 20174: failure to typecheck contents of *T in the frontend.
+
+package p
+
+func f() {
+	_ = (*interface{})(nil) // interface{} here used to not have its width calculated going into backend
+	select {
+	case _ = <-make(chan interface {
+		M()
+	}, 1):
+	}
+}