diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index 627d2d68bbc..9247efaf73a 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -5085,4 +5085,14 @@ void constParameterReference_assign(std::vector<int>& v, int& r) {
 void constParameterReference_insert(std::list<int>& l, int& r) {
     l.insert(l.end(), r);
     l.insert(l.end(), 5, r);
-}
\ No newline at end of file
+}
+
+const char* variableScope_cstr_dummy(const char* q); // #12812
+std::size_t variableScope_cstr(const char* p) {
+    std::string s;
+    if (!p) {
+        s = "abc";
+        p = variableScope_cstr_dummy(s.c_str());
+    }
+    return std::strlen(p);
+}