running ruby -r../backtrace_nothing_swallowed.rb crash.rb
crash.rb:2:in `go2': unhandled exception
	from crash.rb:6:in `go'
	from crash.rb:9
==== 
crash.rb:2:in `go2'
crash.rb:6:in `go'
crash.rb:9
====



running ruby -r../backtrace_with_code.rb crash.rb
crash.rb:2:in `go2': unhandled exception
	from crash.rb:6:in `go'
	from crash.rb:9
==== 
crash.rb:2:in `go2'
	raise
crash.rb:6:in `go'
	go2(a, 55);
crash.rb:9
	go '3'
====



running ruby -r../backtrace_with_code_and_locals.rb crash.rb

unhandled exception: crash.rb:2:   raise
	locals: {"a"=>"3", "b"=>55}
	  from:
	crash.rb:1 go2(a=>3, b=>55)
		locals: {"a"=>"3", "b"=>55}
	crash.rb:5 go(a=>3)
		locals: {"a"=>"3"}