--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-show-locus-no-labels.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,27 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdiagnostics-show-caret -fno-diagnostics-show-labels" } */
+
+/* Verify that -fno-diagnostics-show-labels works.  */
+
+/* This is a collection of unittests for diagnostic_show_locus;
+   see the overview in diagnostic_plugin_test_show_locus.c.
+
+   In particular, note the discussion of why we need a very long line here:
+01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
+   and that we can't use macros in this file.  */
+
+void test_multiline (void)
+{
+#if 0
+  x = (first_function ()
+       + second_function ()); /* { dg-warning "test" } */
+
+  /* This shouldn't have a label.  */
+  /* { dg-begin-multiline-output "" }
+   x = (first_function ()
+        ~~~~~~~~~~~~~~~~~
+        + second_function ());
+        ^ ~~~~~~~~~~~~~~~~~~
+     { dg-end-multiline-output "" } */
+#endif
+}