[grammarians] s-expression dumper: works

[Duncan Mak]

Hello,

I'm trying to use the dump-ruby script, and I'm having trouble running it.

I installed ParseTree and RubyInline using Rubygems and when I try to run
your script, I see this error message:

diphthong:~/src/ruby $ ruby dump-ruby.rb hello.rb
/usr/lib/ruby/gems/1.8/gems/RubyInline-3.5.0/./inline.rb:372:in `build':
undefined method `+' for nil:NilClass (NoMethodError)
        from /usr/lib/ruby/gems/1.8/gems/RubyInline-3.5.0/./inline.rb:602:in
`inline'
        from /usr/lib/ruby/gems/1.8/gems/ParseTree-1.4.0
/lib/parse_tree.rb:101
        from /usr/lib/ruby/1.8/rubygems/custom_require.rb:21:in `require'
        from /usr/lib/ruby/1.8/rubygems.rb:182:in `activate'
        from /usr/lib/ruby/1.8/rubygems.rb:181:in `activate'
        from /usr/lib/ruby/1.8/rubygems.rb:37:in `require_gem_with_options'
        from /usr/lib/ruby/1.8/rubygems.rb:31:in `require_gem'
        from dump-ruby.rb:7

I have ParseTree (1.4.0) and  RubyInline (3.5.0) installed.

P.S, Have you looked into RubyLexer at all? The README claims that it's more
robust than other implementations out there.

Duncan.
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