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#[derive(Debug)]
pub enum ParseError<L,T,E> {
    /// Generated by the parser when it encounters a token (or EOF) it did not
    /// expect.
    InvalidToken {
        location: L
    },

    /// Generated by the parser when it encounters a token (or EOF) it did not
    /// expect.
    UnrecognizedToken {
        /// If this is `Some`, then an unexpected token of type `T`
        /// was observed, with a span given by the two `L` values. If
        /// this is `None`, then EOF was observed when it was not
        /// expected.
        token: Option<(L, T, L)>,

        /// The set of expected tokens: these names are taken from the
        /// grammar and hence may not necessarily be suitable for
        /// presenting to the user.
        expected: Vec<String>
    },

    /// Generated by the parser when it encounters additional,
    /// unexpected tokens.
    ExtraToken {
        token: (L, T, L),
    },

    /// Custom error type.
    User {
        error: E,
    },
}