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    // not all are used in all features configurations
    #![allow(unused)]

    /// Forward a method to an inherent method or a base trait method.
    macro_rules! forward {
        ($( Self :: $method:ident ( self $( , $arg:ident : $ty:ty )* ) -> $ret:ty ; )*)
            => {$(
                #[inline]
                fn $method(self $( , $arg : $ty )* ) -> $ret {
                    Self::$method(self $( , $arg )* )
                }
            )*};
        ($( $base:ident :: $method:ident ( self $( , $arg:ident : $ty:ty )* ) -> $ret:ty ; )*)
            => {$(
                #[inline]
                fn $method(self $( , $arg : $ty )* ) -> $ret {
                    <Self as $base>::$method(self $( , $arg )* )
                }
            )*};
        ($( $base:ident :: $method:ident ( $( $arg:ident : $ty:ty ),* ) -> $ret:ty ; )*)
            => {$(
                #[inline]
                fn $method( $( $arg : $ty ),* ) -> $ret {
                    <Self as $base>::$method( $( $arg ),* )
                }
            )*}
    }

    macro_rules! constant {
        ($( $method:ident () -> $ret:expr ; )*)
            => {$(
                #[inline]
                fn $method() -> Self {
                    $ret
                }
            )*};
    }

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