Hi,

I'm wondering why these 2 procedures are separated. Since an list
argument can be also first pair of the list, I think the
`make-queue-with-list` procedure can be like this:

(make-queue-with-list first [last])

Beside this, the description of `make-queue-with-list` seems forcing
implementations to use a list as its storage. I think this is a bit
over specifying. For example, Sagittarius also has queue library and
it's implemented with deque which doesn't use a list as its storage.
Thus it's impossible to build this SRFI on top of the library. Because
of this, it is also impossible to satisfy O(1) required by
`make-queue-with-first-last`.

--
_/_/
Takashi Kato
E-mail: xxxxxx@ymail.com