How to print the stacktrace in Ruby

print_stacktrace.rb

# How to print the stacktrace from anywhere :

# 1° 
#------------------------------------------------------------------------------
module Kernel
  def print_stacktrace
    raise
  rescue
      puts $!.backtrace[1..-1].join("\n")
  end
end


# 2
#------------------------------------------------------------------------------
class J
  def self.bar
      puts "before"
      print_stacktrace     #<<-------------
      puts "after"
  end
end

class K
  def self.foo
    J.bar
  end
end

begin
  K.foo
end
#------------------------------------------------------------------------------
__END__

RESULT :
  before
  /Users/test/sanbox.rb:19:in `bar'
  /Users/test/sanbox.rb:26:in `foo'
  /Users/test/sanbox.rb:31
  after
  Program exited with code 0 after 0.03 seconds.