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    //! Platform dependent types.

    cfg_if::cfg_if! {
        if #[cfg(feature = "std")] {
            use std::borrow::Cow;
            use std::fmt;
            use std::path::PathBuf;
            use std::prelude::v1::*;
            use std::str;
        }
    }

    /// A platform independent representation of a string. When working with `std`
    /// enabled it is recommended to the convenience methods for providing
    /// conversions to `std` types.
    #[derive(Debug)]
    pub enum BytesOrWideString<'a> {
        /// A slice, typically provided on Unix platforms.
        Bytes(&'a [u8]),
        /// Wide strings typically from Windows.
        Wide(&'a [u16]),
    }

    #[cfg(feature = "std")]
    impl<'a> BytesOrWideString<'a> {
        /// Lossy converts to a `Cow<str>`, will allocate if `Bytes` is not valid
        /// UTF-8 or if `BytesOrWideString` is `Wide`.
        ///
        /// # Required features
        ///
        /// This function requires the `std` feature of the `backtrace` crate to be
        /// enabled, and the `std` feature is enabled by default.
        pub fn to_str_lossy(&self) -> Cow<'a, str> {
            use self::BytesOrWideString::*;

            match self {
                &Bytes(slice) => String::from_utf8_lossy(slice),
                &Wide(wide) => Cow::Owned(String::from_utf16_lossy(wide)),
            }
        }

        /// Provides a `Path` representation of `BytesOrWideString`.
        ///
        /// # Required features
        ///
        /// This function requires the `std` feature of the `backtrace` crate to be
        /// enabled, and the `std` feature is enabled by default.
        pub fn into_path_buf(self) -> PathBuf {
            #[cfg(unix)]
            {
                use std::ffi::OsStr;
                use std::os::unix::ffi::OsStrExt;

                if let BytesOrWideString::Bytes(slice) = self {
                    return PathBuf::from(OsStr::from_bytes(slice));
                }
            }

            #[cfg(windows)]
            {
                use std::ffi::OsString;
                use std::os::windows::ffi::OsStringExt;

                if let BytesOrWideString::Wide(slice) = self {
                    return PathBuf::from(OsString::from_wide(slice));
                }
            }

            if let BytesOrWideString::Bytes(b) = self {
                if let Ok(s) = str::from_utf8(b) {
                    return PathBuf::from(s);
                }
            }
            unreachable!()
        }
    }

    #[cfg(feature = "std")]
    impl<'a> fmt::Display for BytesOrWideString<'a> {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            self.to_str_lossy().fmt(f)
        }
    }