[BUG] Proc#arity regression or bug in RDoc

[Mauricio Fernandez <mfp@acm.org>]

$ ruby19 -v -e "p proc{}.arity"
ruby 1.9.0 (2007-02-07 patchlevel 0) [i686-linux]
0
$ ./ruby19 -v -e "p proc{}.arity"
ruby 1.9.0 (2007-04-26 patchlevel 0) [i686-linux]
-1

However, the RDoc documentation attached to proc_arity still says that it
should return 0, so there's a bug, either in the code (wrong iseq->argc ?) or
in the docs (if the latter, the patch below should do).

See also 
 [ruby-core:2829]
 [ruby-core:11026]
 [ruby-talk:249148]

\f
--- proc.c.orig	2007-04-26 11:48:35.000000000 +0200
+++ proc.c	2007-04-26 11:49:34.000000000 +0200
@@ -410,15 +410,14 @@
  *  call-seq:
  *     prc.arity -> fixnum
  *  
- *  Returns the number of arguments that would not be ignored. If the block
- *  is declared to take no arguments, returns 0. If the block is known
- *  to take exactly n arguments, returns n. If the block has optional
- *  arguments, return -n-1, where n is the number of mandatory
- *  arguments. A <code>proc</code> with no argument declarations
- *  is the same a block declaring <code>||</code> as its arguments.
+ *  If the block is declared to take no arguments, returns -1. If the block is
+ *  known to take exactly n arguments, returns n. If the block has optional
+ *  arguments, return -n-1, where n is the number of mandatory arguments. A
+ *  <code>proc</code> with no argument declarations is the same a block
+ *  declaring <code>||</code> as its arguments.
  *     
- *     Proc.new {}.arity          #=>  0
- *     Proc.new {||}.arity        #=>  0
+ *     Proc.new {}.arity          #=>  -1
+ *     Proc.new {||}.arity        #=>  -1
  *     Proc.new {|a|}.arity       #=>  1
  *     Proc.new {|a,b|}.arity     #=>  2
  *     Proc.new {|a,b,c|}.arity   #=>  3
\f


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