Giovanni Mascellani (@giomasce) commented about libs/vkd3d-shader/dxil.c:
else assert(ins->handler_idx == VKD3DSIH_NOP);
if (dst->type && fwd_type && dst->type != fwd_type)
{
WARN("Type mismatch.\n");
A bit more verbose? Something like "Type mismatches forward reference", just to give a little more context to the debugger.