From: Brian Candler <b.candler@...>
Date: 2010-02-05T16:14:11+09:00
Subject: Re: when should one use "and" and "or"

botp wrote:
> i believe there are other similar quirks when using "and/or"..
> has ruby relegated the use of "and/or"....?

No, but it's essentially inherited from perl. These operators have 
extremely low precedence, so without parens your statement was being 
parsed as something like

  (when x==1) or x==2

I think the typical perl use is something like:

  open F, "foo" or die "Oops";

If you use || then you need extra params so you don't get
open(F, "foo" || die "Oops");

But if you rely on poetry mode like this it may still trip you up. IMO 
you're better off with:

  a = (some-expr) || (raise "Oops")
  a = (some-expr) || raise("Oops")
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