--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/generics/Covar3.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,21 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 4907941
+ * @summary missing ambiguity error
+ * @author gafter
+ *
+ * @compile/fail/ref=Covar3.out -XDrawDiagnostics   Covar3.java
+ */
+
+package covar3;
+
+interface Test3<T> {
+    void f(     T f);
+    void f(String f);
+}
+
+class T {
+    void f(Test3<String> x) {
+        x.f("");
+    }
+}