__allocator       401 gc/include/new_gc_alloc.h   typedef __allocator<_Tp, gc_alloc > allocator_type;
__allocator       421 gc/include/new_gc_alloc.h   typedef __allocator<_Tp, single_client_gc_alloc > allocator_type;
__allocator       441 gc/include/new_gc_alloc.h   typedef __allocator<_Tp, traceable_alloc > allocator_type;
__allocator       461 gc/include/new_gc_alloc.h   typedef __allocator<_Tp, single_client_traceable_alloc > allocator_type;