mruby not printing backtraces anymore?

[pigoz]

Sorry, this is more of a question, I hope it's not too annoying. Trying to get backtraces from mrb with mrb_get_backtrace, but then I realized the mruby executable doesn't print them as well. This is the test file:

def foo
  this_will_fail
end

def bar
  foo
end

def baz
  bar
end

baz

Using mruby (git master)

/Users/pigoz/test.mrb:2: undefined method 'this_will_fail' for main (NoMethodError)

Using mruby (1.0)

trace:
    [3] /Users/pigoz/test.mrb:2:in Object.foo
    [2] /Users/pigoz/test.mrb:6:in Object.bar
    [1] /Users/pigoz/test.mrb:10:in Object.baz
    [0] /Users/pigoz/test.mrb:13
/Users/pigoz/test.mrb:2: undefined method 'this_will_fail' for main (NoMethodError)

Is this a bug? Am a I doing something terribly wrong?

Thanks