pub fn is_extended(&self) -> bool {
        match self {
            Filename::Extended(_, _) => true,
            _ => false
        }
    }
///Returns whether filename is of extended type.
Returns whether filename is of extended type.
Returns whether filename is of extended type .
pub fn is_extended(&self) -> bool {
        match self {
            Filename::Extended(_, _) => true,
            _ => false
        }
    }
pub fn is_extended ( & self ) -> bool { match self { Filename :: Extended ( _ , _ ) => true , _ => false } }
Returns whether filename is of extended type.
Returns whether filename is of extended type .
&self