Update and merge D22437.
fix test cases for bit_ffc_at
This looks better to my eye.
dereference _result properly before trying to assign it
Go for it!
There may be better ways of doing this, this was just a first cut. You can see an example of this being used in the child revision in the stack (D22451)
add test cases to help cover the expected behavior
Updated the review to include additional test cases and fixed the manual page.