Index: unittests/Format/FormatTestProto.cpp
===================================================================
--- unittests/Format/FormatTestProto.cpp
+++ unittests/Format/FormatTestProto.cpp
@@ -220,5 +220,18 @@
                "}");
 }
 
+TEST_F(FormatTestProto, TODO) {
+  verifyFormat("option (MyProto.options) = {\n"
+               "  msg_field: <\n"
+               "    field_a: OK\n"
+               "    field_b: OK\n"
+               "    field_c: OK\n"
+               "    field_d: OK\n"
+               "    field_e: OK\n"
+               "    field_f: OK\n"
+               "  >\n"
+               "};");
+}
+
 } // end namespace tooling
 } // end namespace clang