pub trait LiteralExt {
    /// If the `Literal` is an integer literal, returns its value.
    fn parse_int(&self) -> Option<IntLit>;

    /// If the `Literal` is a floating point literal, returns its value.
    fn parse_float(&self) -> Option<FloatLit>;

    /// If the `Literal` is a string literal, returns it's value.
    fn parse_string(&self) -> Option<String>;

    /// If the `Literal` is a char literal, returns it's value.
    fn parse_char(&self) -> Option<char>;

    /// If the `Literal` is a byte string literal, returns it's value.
    fn parse_bytes(&self) -> Option<Vec<u8>>;

    /// If the `Literal` is a byte literal, returns it's value.
    fn parse_byte(&self) -> Option<u8>;

    /// If the `Literal` is an inner doc comment (`//!` or `/*!`), returns a
    /// string with the text of the comment.
    fn parse_inner_doc(&self) -> Option<String>;

    /// If the `Literal` is an outer doc comment (`///` or `/**`), returns a
    /// string with the text of the comment.
    fn parse_outer_doc(&self) -> Option<String>;
}