Pry output for debugging safe_yaml Psych::Nodes issues (https://github.com/dtao/safe_yaml/issues/72)

gistfile1.txt

[1] pry(SafeYAML::PsychResolver)> show-source -a Psych
Found 2 candidates for `Psych` definition:

Candidate 1/2: /home/singularperturbation/.rbenv/versions/2.2.0/lib/ruby/2.2.0/psych/syntax_error.rb @ line 3:
Number of lines: 19

module Psych
  class SyntaxError < Psych::Exception
    attr_reader :file, :line, :column, :offset, :problem, :context

    def initialize file, line, col, offset, problem, context
      err      = [problem, context].compact.join ' '
      filename = file || '<unknown>'
      message  = "(%s): %s at line %d column %d" % [filename, err, line, col]

      @file    = file
      @line    = line
      @column  = col
      @offset  = offset
      @problem = problem
      @context = context
      super(message)
    end
  end
end

Candidate 2/2: /home/singularperturbation/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/psych-2.0.8/lib/psych/exception.rb @ line 1:
Number of lines: 13

module Psych
  class Exception < RuntimeError
  end

  class BadAlias < Exception
  end

  class DisallowedClass < Exception
    def initialize klass_name
      super "Tried to load unspecified class: #{klass_name}"
    end
  end
end
[2] pry(SafeYAML::PsychResolver)> show-source -a Psych::Nodes
Error: Couldn't locate a definition for Psych::Nodes!
[3] pry(SafeYAML::PsychResolver)>

This was after putting binding.pry in psych_resolver.rb, and psych was included in psych_handler.rb, which was loaded before. If I start irb/pry and manually do require 'psych' in the REPL, I can see Psych::Nodes just fine. I wasn't able to tell how/where Psych was being overridden, though.