rubinius/rubinius — pull request #1586 by ryoqun (2012-03-04 10:45:55+00:00)
Title: Assert stack_ after status_

`FiberData::take_stack()` incorrectly asserts that stack_ isn't `NULL` before checking `status_`.

If `status_` is `eOnStack` or `eRunning`, `stack_` legitimately can be `NULL`.