Function libgit2_sys::git_diff_tree_to_workdir_with_index

pub unsafe extern fn git_diff_tree_to_workdir_with_index(diff: *mut *mut git_diff,
                                                         repo: *mut git_repository,
                                                         old_tree: *mut git_tree,
                                                         opts: *const git_diff_options)
                                                         -> c_int