Function rustc_ap_rustc_fs_util::link_or_copy

pub fn link_or_copy<P: AsRef<Path>, Q: AsRef<Path>>(
    p: P, 
    q: Q
) -> Result<LinkOrCopy>

Copies p into q, preferring to use hard-linking if possible. If q already exists, it is removed first. The result indicates which of the two operations has been performed.