vc-workfile-version
vc-workfile-version is an alias for `vc-working-revision' in `vc-hooks.el
'.
(vc-workfile-version FILE &optional BACKEND)
This function is obsolete since 23.1;
use `vc-working-revision' instead.
Return the repository version from which FILE was checked out.
If FILE is not registered, this function always returns nil.