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    #![allow(dead_code)] // not used on all platforms

    use crate::fs;
    use crate::io::{self, Error, ErrorKind};
    use crate::path::Path;

    pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
        if !from.is_file() {
            return Err(Error::new(
                ErrorKind::InvalidInput,
                "the source path is not an existing regular file",
            ));
        }

        let mut reader = fs::File::open(from)?;
        let mut writer = fs::File::create(to)?;
        let perm = reader.metadata()?.permissions();

        let ret = io::copy(&mut reader, &mut writer)?;
        fs::set_permissions(to, perm)?;
        Ok(ret)
    }

    pub fn remove_dir_all(path: &Path) -> io::Result<()> {
        let filetype = fs::symlink_metadata(path)?.file_type();
        if filetype.is_symlink() { fs::remove_file(path) } else { remove_dir_all_recursive(path) }
    }

    fn remove_dir_all_recursive(path: &Path) -> io::Result<()> {
        for child in fs::read_dir(path)? {
            let child = child?;
            if child.file_type()?.is_dir() {
                remove_dir_all_recursive(&child.path())?;
            } else {
                fs::remove_file(&child.path())?;
            }
        }
        fs::remove_dir(path)
    }