From: why the lucky stiff <ruby-talk@...>
Date: 2003-06-13T04:43:49+09:00
Subject: Re: src/yaml.y.rb:210: warning: ambiguous first argument; make sure

On Thursday 12 June 2003 01:23 pm, ahoward wrote:
> any one get this error when running with '-w'?
>
> took a peek in the file - but there are some bizarre goings on in there:
>
> module_eval <<'.,.,', 'src/yaml.y.rb', 81
>

You are looking at code generated by Racc.  I would upgrade to a newer version 
of YAML.rb.  YAML.rb previous to 0.60 is being deprecated.

> looks like some heredocs and...  what?  can anyone explain this syntax -
> looks like C preprocessor stuff?

Very similiar.  These statements alter __FILE__ and __LINE__.  If you look in 
the YAML.rb distribution, you'll find src/yaml.y.rb and src/emitter.rb.  
These two files are cobbled into yaml.rb when you install.

_why