Broken ruby-prof output

method-missing-from-profile.rb

require 'ruby-prof'

class Bar
  def foo(a)
    print "foo\n"
    a.map do |x|
      a = x * x
      yield a
    end
  end

  def baz(c)
    c
  end
end

# Profile the code
result = RubyProf.profile do
  Bar.send :define_method, :bar, do |b|
    a = 0
    a = b * b - a
    a = b * b - a
    a = b * b - a
    a = b * b - a
    a = b * b - a
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    a = b * b - a
    a = b * b - a
    a = b * b - a
    a = b * b - a
    baz(a/b)
  end

  b = Bar.new
  b.foo((1..10000).to_a){|x| b.bar x}
end

# Print a graph profile to text
printer = RubyProf::GraphPrinter.new(result)
printer.print(STDOUT, {})

profile-tree.txt

foo
Thread ID: 15579500
Total Time: 0.365725614

  %total   %self     total      self      wait     child            calls   Name
--------------------------------------------------------------------------------
 100.00%   0.00%      0.37      0.00      0.00      0.37                1     Global#[No method]
                      0.37      0.00      0.00      0.37              1/1     Bar#foo
                      0.00      0.00      0.00      0.00              1/1     Enumerable#to_a
                      0.00      0.00      0.00      0.00              1/1     Class#new
                      0.00      0.00      0.00      0.00              1/1     Module#define_method
--------------------------------------------------------------------------------
                      0.37      0.00      0.00      0.37              1/1     Global#[No method]
  99.88%   0.00%      0.37      0.00      0.00      0.37                1     Bar#foo
                      0.37      0.36      0.00      0.01              1/1     Array#map
                      0.00      0.00      0.00      0.00              1/1     Kernel#print
--------------------------------------------------------------------------------
                      0.37      0.36      0.00      0.01              1/1     Bar#foo
  99.87%  98.31%      0.37      0.36      0.00      0.01                1     Array#map
                      0.01      0.01      0.00      0.00      10000/10000     Bar#baz
--------------------------------------------------------------------------------
                      0.01      0.01      0.00      0.00      10000/10000     Array#map
   1.56%   1.56%      0.01      0.01      0.00      0.00            10000     Bar#baz
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Global#[No method]
   0.11%   0.00%      0.00      0.00      0.00      0.00                1     Enumerable#to_a
                      0.00      0.00      0.00      0.00              1/1     Range#each
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Enumerable#to_a
   0.11%   0.11%      0.00      0.00      0.00      0.00                1     Range#each
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Bar#foo
   0.01%   0.00%      0.00      0.00      0.00      0.00                1     Kernel#print
                      0.00      0.00      0.00      0.00              1/1     IO#write
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Kernel#print
   0.00%   0.00%      0.00      0.00      0.00      0.00                1     IO#write
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Global#[No method]
   0.00%   0.00%      0.00      0.00      0.00      0.00                1     Class#new
                      0.00      0.00      0.00      0.00              1/1     BasicObject#initialize
                      0.00      0.00      0.00      0.00              1/1     <Class::BasicObject>#allocate
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Global#[No method]
   0.00%   0.00%      0.00      0.00      0.00      0.00                1     Module#define_method
                      0.00      0.00      0.00      0.00              1/1     Module#method_added
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Class#new
   0.00%   0.00%      0.00      0.00      0.00      0.00                1     BasicObject#initialize
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Class#new
   0.00%   0.00%      0.00      0.00      0.00      0.00                1     <Class::BasicObject>#allocate
--------------------------------------------------------------------------------
                      0.00      0.00      0.00      0.00              1/1     Module#define_method
   0.00%   0.00%      0.00      0.00      0.00      0.00                1     Module#method_added