add test case for #3348

Author: liufengyun

tests/neg/i3348.scala

@@ -0,0 +1,10 @@
+class Test {
+  import Test.test
+  "Hello".toto     // error
+}
+
+object Test {
+  def test = {
+    implicitly[collection.generic.CanBuildFrom[List[Int], Int, List[Int]]]
+  }
+}