From: Yukihiro Matsumoto <matz@...>
Date: 2008-11-03T22:59:31+09:00
Subject: [ruby-core:19682] Re: Odd TypeError in inject (1.9.1 preview 1)

Hi,

In message "Re: [ruby-core:19660] Odd TypeError in inject (1.9.1 preview 1)"
    on Fri, 31 Oct 2008 20:20:56 +0900, "David A. Black" <dblack@rubypal.com> writes:

|I think this should return 0. Anything I'm missing?
|
|>> RUBY_DESCRIPTION
|=> "ruby 1.9.1 (2008-10-28 revision 19983) [i386-darwin9.5.0]"
|>> [].inject(0)
|TypeError: 0 is not a symbol
| 	from (irb):4:in `inject'
| 	from (irb):4
| 	from /usr/local/bin/irb19:12:in `<main>'

According to [ruby-core:19666], you expect [].inject(0) to work as

   obj.enum_for(:inject, other_object)

right?  But the current behavior of enumerator only works right for
iterators that do not use the values from blocks. e.g. #each.  So,
enumerators do not work for #inject (and #map).  So expecting
something do not work is kinda weird.

							matz.