diff --git a/test/testother.cpp b/test/testother.cpp
index f03c15798..6df5e23c7 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -3382,6 +3382,17 @@ private:
               "    struct callbacks ops = { .something = something };\n"
               "}\n");
         TODO_ASSERT_EQUALS("", "[test.cpp:6]: (warning) Redundant assignment of 'something' to itself.\n", errout.str());
+
+        // #6406 - designated initializer doing bogus self assignment
+        check("struct callbacks {\n"
+              "    void (*something)(void);\n"
+              "};\n"
+              "void something(void) {}\n"
+              "void f() {\n"
+              "    struct callbacks ops = { .something = ops.something };\n"
+              "}\n");
+        TODO_ASSERT_EQUALS("[test.cpp:6]: (warning) Redundant assignment of 'something' to itself.\n", "", errout.str());
+
     }
 
     void trac1132() {