From: matz@... (Yukihiro Matsumoto)
Date: 2000-12-02T03:03:37+09:00
Subject: [ruby-talk:6712] Re: behavior of Proc#arity?

Hi,

In message "[ruby-talk:6682] behavior of Proc#arity?"
    on 00/12/01, Steven Grady <grady@scam.xcf.berkeley.edu> writes:

|    ||
|    |a|
|    |*a|
|return -1, while there is nothing that returns 0 or 1?

They accept any number of arguments without causing error, thus their
arity must return -1.  |a| is something like compromised |*a|, which I
mean it's almost identical to |*a|, but since it appears to accept
just one argument, it treats single argument specially.

For exactly one argument, use |a,|.  Notice trailing comma.

							matz.