https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118096
--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
Reduced but still a bit gross:
```
void fancy_abort(char *, int, const char *) __attribute__((__noreturn__));
unsigned m_num;
struct vl_ptr;
struct va_heap {
typedef vl_ptr default_layout;
};
template <typename, typename A = va_heap, typename = typename
A::default_layout>
struct vec;
int vNULL;
template <typename T, typename A> struct vec<T, A, int> {
T operator[](unsigned ix) {
ix < m_num ? fancy_abort("", 0, __FUNCTION__), 0 : 0;
return ix;
}
};
template <typename T> struct vec<T> {
vec(int);
T operator[](unsigned ix) { return m_vec[ix]; }
vec<T, va_heap, int> m_vec;
};
int *graphds_scc_queue;
vec<int> graphds_scc_postorder = vNULL;
void graphds_scc() {
int i;
for (; i; i++)
graphds_scc_queue[i] = graphds_scc_postorder[1];
}
```
