diff --git a/test/interface/explicit.go b/test/interface/explicit.go
index 7822b88..eb81156 100644
--- a/test/interface/explicit.go
+++ b/test/interface/explicit.go
@@ -15,6 +15,10 @@
 
 var t *T
 
+type X int
+
+func (x *X) M() {}
+
 type I interface {
 	M()
 }
@@ -66,6 +70,8 @@
 
 var _ = m.(Int) // ERROR "impossible type assertion"
 
+var _ = m.(X) // ERROR "pointer receiver"
+
 var ii int
 var jj Int