Reference in Coq Lists library not found -


i'm trying use concat function appears in https://coq.inria.fr/distrib/current/stdlib/coq.lists.list.html. tried following:

require import arith coq.lists.list. import listnotations.  definition con (l : list nat):= (concat [[0]; l]). 

but error error: reference concat not found in current environment. thought should work since i've imported library, don't know error comes from.

i'm using version 8.4pl3 (january 2014). version issue?

concat added in this commit. think close end of 8.4pl3 release not pushed release, rather next 8.5


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