Merge pull request #10963 from griggt/fix-#6665

Fix #6665: Add regression test

Author: odersky

tests/pos/i6665/Bad_2.scala

@@ -0,0 +1,4 @@
+package foo
+import foo._
+object A extends Oops
+object B extends Oops

tests/pos/i6665/Oops_1.scala

@@ -0,0 +1,11 @@
+package foo
+
+trait TOops
+{
+    def oops: Unit ?=> Unit
+}
+
+trait Oops extends TOops
+{
+    override def oops: Unit ?=> Unit = (x) ?=> x
+}