X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=assignment9.mdwn;h=20a8968dcd807b1d79505b23fbf6b5cc882014e4;hp=524c9efead1823ce9c95248d66acfe4f2335f88b;hb=f5af9a2dbe19bcd70978009a80771ab0f381c710;hpb=6634e47c2d920a24c18277147590c8146b2d1284 diff --git a/assignment9.mdwn b/assignment9.mdwn index 524c9efe..20a8968d 100644 --- a/assignment9.mdwn +++ b/assignment9.mdwn @@ -118,14 +118,14 @@ val make_int_stream : int -> int stream = [fun] val int_stream : int stream = Next (1, [fun]) (* First element: 1 *) # let tail = match int_stream with Next (i, rest) -> rest;; -val tail : unit -> int stream = (* Tail: a thunk *) +val tail : unit -> int stream = (* Tail: a thunk *) (* Force the thunk to compute the second element *) # tail ();; - : int stream = Next (2, [fun]) (* Second element: 2 *) # match tail () with Next (_, rest) -> rest ();; -- : int stream = Next (3, ) (* Third element: 3 *) +- : int stream = Next (3, ) (* Third element: 3 *) You can think of `int_stream` as a functional object that provides