Indexed_alt.Core_over_functormodule Functor : Preface_specs.INDEXED_FUNCTORmodule Req :
Preface_specs.Indexed_alt.WITH_COMBINE
with type ('a, 'index) t = ('a, 'index) Functor.ttype ('a, 'index) t = ('a, 'index) Req.tA type ('a, 'index) t held by the Alt.