From: Dan Doel <djd15@...>
Date: 2003-11-20T18:35:56+09:00
Subject: Re: x.f! RCR

Oh, that's actually a very good point about ! methods. They're usually 
defined to have
a return value that evaluates to true when the object was modified, and 
evaluates to
false when not modified.

So  f.b! => f = f.b doesn't work because it always returns true 
(essentially) unless
f.b is false or nil for some reason.

I had forgotten about that. That effectively kills this proposal 
assuming you want to
preserve existing semantics.

- Dan