D
int main() {
int & const a = 5;
}
$ clang++ m.cpp
m.cpp:2:8: error: 'const' qualifier may not be applied
to a reference
int & const a = 5;
^
m.cpp:2:14: error: non-const lvalue reference to type
'int' cannot bind to a temporary of type 'int'
int & const a = 5;
^ ~
2 errors generated.