Merge pull request #7832 from WalterBright/chain-test

add test for Throwable.opApply()
merged-on-behalf-of: Mike Franklin <JinShil@users.noreply.github.com>

test/runnable/eh.d

@@ -379,6 +379,15 @@ void bug1513b()
         assert(e.msg == "d");
         assert(e.next.msg == "f");
         assert(!e.next.next);
+        int i;
+        foreach (u; e)
+        {
+            if (i)
+                assert(u.msg == "f");
+            else
+                assert(u.msg == "d");
+            ++i;
+        }
     }
 }