From: Josh Cheek <josh.cheek@...>
Date: 2011-06-14T19:35:34+09:00
Subject: Re: A way to find out when a constant gets defined?

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On Tue, Jun 14, 2011 at 4:53 AM, Robert Klemme
<shortcutter@googlemail.com>wrote:

> Use set_trace_func lambda {|*a| p a} before the first require and try
> to see whether you can find out from there psych code is loaded.
>
>
This worked. I figured out that it must be coming from Bundler itself.
Running set_trace_func against `require "bundler"` finds this:


require 'pp'

set_trace_func lambda { |event, filename, target_line, id, bnd, classname|
  next unless event == 'class'
  next unless File.exist? filename
  crnt_line = (1..1/0.0).each
  File.foreach filename do |line|
    next unless crnt_line.next == target_line && line =~ /psych/i
    puts "IN FILE #{filename.inspect}"
    puts "ON LINE #{target_line}"
    puts "THE LINE: #{line.inspect}"
    begin
      raise 'gettin the backtrace'
    rescue
      pp $!.backtrace
    end
    puts '-' * 100
  end
}

require 'bundler'
# >> IN FILE
"/Users/josh/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/yaml.rb"
# >> ON LINE 39
# >> THE LINE: "module Psych\n"
# >> ["-:13:in `block (2 levels) in <main>'",
# >>  "-:7:in `foreach'",
# >>  "-:7:in `block in <main>'",
# >>  "/Users/josh/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/yaml.rb:39:in
`<module:Psych>'",
# >>  "/Users/josh/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/yaml.rb:39:in
`<top (required)>'",
# >>
 "/Users/josh/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'",
# >>
 "/Users/josh/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'",
# >>
 "/Users/josh/.rvm/gems/ruby-1.9.2-p180/gems/bundler-1.1.pre.5/lib/bundler.rb:10:in
`<top (required)>'",
# >>  "<internal:lib/rubygems/custom_require>:33:in `require'",
# >>  "<internal:lib/rubygems/custom_require>:33:in `rescue in require'",
# >>  "<internal:lib/rubygems/custom_require>:29:in `require'",
# >>  "-:21:in `<main>'"]
# >>
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Looking at its source, it comes from requiring yaml, a quick test:
$ ruby -e 'require "yaml"; p Psych'
Psych



So I guess thats where it comes from. My errors are intermittent (and omg is
that frustrating), but if I can nail down a reproducible example of the
problem, I'll post it.

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