From: gotoken@... (GOTO Kentaro)
Date: 1999-05-17T17:52:05+09:00
Subject: [ruby-talk:00319] Re: Arity features for Proc object?

In message "[ruby-talk:00318] Re: Arity features for Proc object?"
    on 99/05/17, Yukihiro Matsumoto <matz@netlab.co.jp> writes:
>I see.  Thank you.  I expected you to answer this question, Gotoken.

Aha, I felt that I was called :-)
If I can add an etymology, `arity' is a technical term of mathematics, 
which is derived from unary, binary, trinary, ... , n-ary etc. 
It is reraly translated to `kou suu' in Japanese. 

>Parameter assignment for blocks is done by multiple assignment, which
>does not do the number check.  I know it's little bit weird for Proc
>objects, but the Proc is relatively new feature to Ruby.  I couldn't
>ignore compatibility.  I would add argument number check to the Proc
>objects in the future version, maybe.

I hope so.  But it might cause serious incompatibility to earlier
versions because Proc.new{|i|...} can receive .call(a,b) as an array. 
We should have discussions. 

-- gotoken