Re: Proc.==

On Jun 5, 2007, at 11:48, David Flanagan wrote:

> Eric Hodel wrote:
>> A proc is more than just its body.
>
> I understand.  My point is that the Proc.== documentation says:
>
>      Return +true+ if _prc_ is the same object as _other_proc_, or if
>      they are both procs with the same body.
>
> To me, this implies that you can use == to compare the body of two  
> separate proc objects.  I couldn't come up with any case where you  
> could actually do this.  Nobu pointed out that when two procs have  
> empty bodies, == works for comparing them, but so far, there are no  
> other cases in which the documentation matches the implementation.
>
> I suggest that the implementation is correct and the documentation  
> is in error.

Proc#== works no differently than Object#==.  proc {} == proc {} due  
to an implementation detail.  To make this work the way you think it  
should work you'd need to walk the ASTs and so-forth of each proc.

Since we're talking about something implemented in C, I feel that  
"same" means pointers, not walking ASTs.