typedef struct x1f4_??list_type {
void *trans;
} x1f4_??list_type;
The struct x1f4_??list_type record has a trans pointer
feature, indicating a memory allocation construct in the struct
x1f4_trans_type definition.
The struct x1f4_??list_type is used by the double ended queue
constructor routines for construction specifications - specifically, for the
memory allocator specification.
The use of the struct x1f4_??list_type fields and its use entirely is
restricted by the construction flags.