I found that forward_list has only

forward_list(const forward_list<T,Allocator>& x);
forward_list(forward_list<T,Allocator>&& x);

but misses

forward_list(const forward_list& x, const Allocator&);
forward_list(forward_list&& x, const Allocator&);

Note to other reviewers: I also checked the container adaptors for similar inconsistencies, but as far as I can see these are already handled by the current active issues 1194 and 1199.