1 files changed, 26 insertions, 0 deletions
diff --git a/test/fixedbugs/issue42784.go b/test/fixedbugs/issue42784.go
new file mode 100644
index 0000000..e2b06e9
--- /dev/null
+++ b/test/fixedbugs/issue42784.go
@@ -0,0 +1,26 @@
+// compile
+
+// Copyright 2020 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.
+
+// Ensure that late expansion correctly set OpLoad argument type interface{}
+
+package p
+
+type iface interface {
+	m()
+}
+
+type it interface{}
+
+type makeIface func() iface
+
+func f() {
+	var im makeIface
+	e := im().(it)
+	g(e)
+}
+
+//go:noinline
+func g(i it) {}