[Caml-list] sig

[Walter Cazzola <cazzola@dico.unimi.it>]

Dear all,
sorry for being so dumb but I've still problems with types and the sig
syntax.

I'm trying to write a Graph ADT:

  module type GraphADT =
    sig
       type 'a graph
       val EmptyGraph : 'a graph

       val AddNode : 'a * 'a graph -> 'a graph
    end;;

but when I try to evaluate it I get:

   Syntax error: 'end' expected, the highlighted 'sig' might be unmatched

pointing to the row inbetween type and the first val but I don't
understand why and how to solve it.

Any help is welcome as always

TIA
Walter
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