CoercDb.coerc_carr -> CoercDb.coerc_carr -> UriManager.uri -> int ->
string (* baseuri *) ->
(CoercDb.coerc_carr * CoercDb.coerc_carr * UriManager.uri *
- int (* saturations *) * Cic.obj * int (* arity *)) list
+ int (* saturations *) * Cic.obj * int (* arity *) * int (* cpos *)) list
exception UnableToCompose