From: Mauricio Fernandez <mfp@...>
Date: 2006-05-07T16:34:54+09:00
Subject: Re: Proc#arity bug?

On Sun, May 07, 2006 at 01:11:44PM +0900, Logan Capaldo wrote:
> On May 6, 2006, at 11:03 PM, polypus wrote:
> >p = proc {}
> >p.arity -> -1
> >
> >shouldn't that be returning 0?
> >
> >btw p = proc { |*a| } gives me -1 like it should.
> >
> >ruby 1.8.4 (2005-12-24) [i686-linux]
> 
> It's not a bug it's a feature:
> 
> proc { || } has arity 0, proc {} takes any number of args and ignores  
> them.

Note that lambda{}.arity == 0 in 1.9:

RUBY_VERSION                                       # => "1.9.0"
RUBY_RELEASE_DATE                                  # => "2006-05-01"
lambda{ }.arity                                    # => 0
lambda{}.call(1,2,3)
# ~> -:4: wrong number of arguments (3 for 0) (ArgumentError)
# ~> 	from -:4

-- 
Mauricio Fernandez  -   http://eigenclass.org   -  singular Ruby