diff -r 000000000000 -r 959103a6100f test/tools/javac/varargs/6993978/T6993978neg.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/varargs/6993978/T6993978neg.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,17 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug     6993978
+ * @author mcimadamore
+ * @summary  ClassCastException occurs in assignment expressions without any heap pollutions
+ * @compile/fail/ref=T6993978neg.out -Xlint:unchecked -Werror -XDrawDiagnostics T6993978neg.java
+ */
+
+import java.util.List;
+
+class T6993978neg {
+   @SuppressWarnings({"varargs","unchecked"})
+   static <X> void m(X... x) {  }
+   static void test(List<String> ls) {
+       m(ls); //compiler should still give unchecked here
+   }
+}