Function adopt_write_claim 

pub fn adopt_write_claim(
    from_session: &str,
    to_session: &str,
    workspace: &Path,
    relative: &str,
) -> Result<(), String>

Drop a claim this session holds, and no other session’s claim. Move a finished child’s claim to the parent, or claim an unowned dirty path for the parent. A path another live session already owns is left alone.