--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/warn/Wconversion-null-4.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,43 @@
+// { dg-do compile  }
+// { dg-options "-Wconversion-null -fdiagnostics-show-caret" }
+
+#include <stddef.h>
+
+void callee_1 (int, int, int) {} // { dg-message "declared here" }
+
+void caller_1 (void)
+{
+  callee_1 (0, NULL, 2); // { dg-warning "passing NULL to non-pointer argument 2 of" }
+  /* { dg-begin-multiline-output "" }
+   callee_1 (0, NULL, 2);
+                ^~~~
+     { dg-end-multiline-output "" } */
+  /* { dg-begin-multiline-output "" }
+ void callee_1 (int, int, int) {}
+                     ^~~
+     { dg-end-multiline-output "" } */
+}
+
+void callee_2 (int, void *, int) {} // { dg-message "declared here" "" { target { ! c++11 } } }
+// { dg-message "initializing argument 2 of " "" { target c++11 } .-1 }
+
+void caller_2 (void)
+{
+  callee_2 (0, false, 2); // { dg-warning "converting 'false' to pointer type for argument 2 of " "" { target { ! c++11 } } }
+  // { dg-error "cannot convert" "" { target c++11 } .-1 }
+
+  /* { dg-begin-multiline-output "" }
+   callee_2 (0, false, 2);
+                ^~~~~
+     { dg-end-multiline-output "" { target { ! c++11 } } } */
+  /* { dg-begin-multiline-output "" }
+   callee_2 (0, false, 2);
+                ^~~~~
+                |
+                bool
+     { dg-end-multiline-output "" { target c++11 } } */
+  /* { dg-begin-multiline-output "" }
+ void callee_2 (int, void *, int) {}
+                     ^~~~~~
+     { dg-end-multiline-output "" } */
+}