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[Caml-list] Pattern matching missing (or brain damage?)
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Date: -- (:)
From: Michael Vanier <mvanier@c...>
Subject: Re: [Caml-list] Pattern matching missing (or brain damage?)


# type ex = A of int | B of int | C of int | D of int | E of int;;
type ex = A of int | B of int | C of int | D of int | E of int
# let a = A 1000;;
val a : ex = A 1000
# match a with
     A(_) | B(_) | C(_) -> "foo"
  |  C(_) | D(_) | E(_) -> "bar";;
- : string = "foo"

You put in an extra | before the A(_).

Mike


> Date: Fri, 19 Jul 2002 00:22:44 +0200
> From: Alessandro Baretta <alex@baretta.com>
> 
> I believe I remember a pattern matching construct where an 
> expression could be associated with multiple patterns.
> 
> match <expr> with
> | A(_) | B(_) | C(_) -> foo
> | C(_) | D(_) | E(_) -> bar
> 
> Neither does the compiler accept such code, nor does the 
> manual mention such construct. Has it been removed from the 
> language or am I suffering severe brain damage from too much 
> O'Caml coding?
> 
> Alex
> 
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