Finding the Ruby method definition - one that is invoked at runtime.

understanding_the_method_method.rb

class Fixnum
    def crime
    end
end
p 2.method(:crime)
#<Method: Fixnum#crime>    #crime() defined in Fixnum class is invoked

module Loser
  def crime
  end
end

module Perpetrator
  def crime
  end
end

class Fixnum
  include Loser
  include Perpetrator
end

p 2.method(:crime)
#<Method: Fixnum(Perpetrator)#crime>   #crime() defined in Perpetrator module is invoked

class Fixnum
    def crime
    end
end

p 2.method(:crime)
#<Method: Fixnum#crime>     #re-defined crime() in Fixnum class is invoked

p 2.method(:crime).source_location     #shows file full path and line number #From Ruby 1.9 only
# => ["/home/karthik/MyRubyProjects/practice/katas/ruby_method_method_test.rb", 22]