--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-show-locus-bw-line-numbers.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,120 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdiagnostics-show-caret -fdiagnostics-show-line-numbers" } */
+
+/* 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_simple (void)
+{
+#if 0
+  myvar = myvar.x; /* { dg-warning "test" } */
+
+/* { dg-begin-multiline-output "" }
+   14 |   myvar = myvar.x;
+      |           ~~~~~^~
+   { dg-end-multiline-output "" } */
+#endif
+}
+
+void test_multiline (void)
+{
+#if 0
+  x = (first_function ()
+       + second_function ()); /* { dg-warning "test" } */
+
+/* { dg-begin-multiline-output "" }
+   26 |   x = (first_function ()
+      |        ~~~~~~~~~~~~~~~~~
+   27 |        + second_function ());
+      |        ^ ~~~~~~~~~~~~~~~~~~
+      |        |
+      |        label
+   { dg-end-multiline-output "" } */
+#endif
+}
+
+void test_very_wide_line (void)
+{
+#if 0
+                                                                                float f = foo * bar; /* { dg-warning "95: test" } */
+/* { dg-begin-multiline-output "" }
+      |        0         0         0         0         0         1         1  
+      |        5         6         7         8         9         0         1  
+      | 3456789012345678901234567890123456789012345678901234567890123456789012
+   43 |                                       float f = foo * bar;
+      |                                                 ~~~~^~~~~
+      |                                                     |
+      |                                                     label 0
+      |                                                 bar * foo
+   { dg-end-multiline-output "" } */
+#endif
+}
+
+/* Unit test for rendering of insertion fixit hints
+   (example taken from PR 62316).  */
+
+void test_fixit_insert (void)
+{
+#if 0
+   int a[2][2] = { 0, 1 , 2, 3 }; /* { dg-warning "insertion hints" } */
+/* { dg-begin-multiline-output "" }
+   63 |    int a[2][2] = { 0, 1 , 2, 3 };
+      |                    ^~~~
+      |                    {   }
+   { dg-end-multiline-output "" } */
+#endif
+}
+
+/* Unit test for rendering of "remove" fixit hints.  */
+
+void test_fixit_remove (void)
+{
+#if 0
+  int a;; /* { dg-warning "example of a removal hint" } */
+/* { dg-begin-multiline-output "" }
+   77 |   int a;;
+      |         ^
+      |         -
+   { dg-end-multiline-output "" } */
+#endif
+}
+
+/* Unit test for rendering of "replace" fixit hints.  */
+
+void test_fixit_replace (void)
+{
+#if 0
+  gtk_widget_showall (dlg); /* { dg-warning "example of a replacement hint" } */
+/* { dg-begin-multiline-output "" }
+   91 |   gtk_widget_showall (dlg);
+      |   ^~~~~~~~~~~~~~~~~~
+      |   gtk_widget_show_all
+   { dg-end-multiline-output "" } */
+#endif
+}
+
+
+/* Unit test for rendering of fix-it hints that add new lines.  */
+
+void test_fixit_insert_newline (void)
+{
+#if 0
+  switch (op)
+    {
+    case 'a':
+      x = a;
+    case 'b':  /* { dg-warning "newline insertion" } */
+      x = b;
+    }
+/* { dg-begin-multiline-output "" }
+  109 |       x = a;
+  +++ |+      break;
+  110 |     case 'b':
+      |     ^~~~~~~~
+   { dg-end-multiline-output "" } */
+#endif
+}