Lwt_dllist is an object holding a list of elements which support
the following operations:
adding an element to the left or the right in time and space O(1)
taking an element from the left or the right in time and space O(1)
removing a previously added element from a sequence in time and space O(1)
removing an element while the sequence is being traversed.
This module was formerly part of the Lwt core distribution as the
Lwt_sequence module, but has been pulled out into a separate library since it
is really just an implementation detail of Lwt.
You can migrate existing uses of
Lwt_dllist by simply
renaming the module. The implementation of the module remains unchanged, but
the name reflects the fact that the implementation is a doubly-linked list.