Add passing test. (#7063)

Author: smillst

checker/tests/nullness/Issue6671.java

@@ -0,0 +1,20 @@
+package open.falsepos;
+
+// Use the Nullness Checker
+public interface Issue6671<E extends Exception> {
+  Object _apply(Object t) throws E;
+
+  default Object apply(Object t) {
+    try {
+      return _apply(t);
+    } catch (Exception e) {
+      sneakyThrow(e);
+      throw new RuntimeException(e);
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  private static <T extends Throwable> void sneakyThrow(final Throwable x) throws T {
+    throw (T) x;
+  }
+}