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    // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    use std::fmt;

    use syntax;

    /// An error that occurred during parsing or compiling a regular expression.
    #[derive(Debug)]
    pub enum Error {
        /// A syntax error.
        Syntax(syntax::Error),
        /// The compiled program exceeded the set size limit.
        /// The argument is the size limit imposed.
        CompiledTooBig(usize),
        /// **DEPRECATED:** Will be removed on next major version bump.
        ///
        /// This error is no longer used. (A `RegexSet` can now contain zero or
        /// more regular expressions.)
        InvalidSet,
        /// Hints that destructuring should not be exhaustive.
        ///
        /// This enum may grow additional variants, so this makes sure clients
        /// don't count on exhaustive matching. (Otherwise, adding a new variant
        /// could break existing code.)
        #[doc(hidden)]
        __Nonexhaustive,
    }

    impl ::std::error::Error for Error {
        fn description(&self) -> &str {
            match *self {
                Error::Syntax(ref err) => err.description(),
                Error::CompiledTooBig(_) => "compiled program too big",
                Error::InvalidSet => {
                    "sets must contain 2 or more regular expressions"
                }
                Error::__Nonexhaustive => unreachable!(),
            }
        }

        fn cause(&self) -> Option<&::std::error::Error> {
            match *self {
                Error::Syntax(ref err) => Some(err),
                _ => None,
            }
        }
    }

    impl fmt::Display for Error {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            match *self {
                Error::Syntax(ref err) => err.fmt(f),
                Error::CompiledTooBig(limit) => {
                    write!(f, "Compiled regex exceeds size limit of {} bytes.",
                           limit)
                }
                Error::InvalidSet => {
                    write!(f, "Sets must contain 2 or more regular expressions.")
                }
                Error::__Nonexhaustive => unreachable!(),
            }
        }
    }

    impl From<syntax::Error> for Error {
        fn from(err: syntax::Error) -> Error {
            Error::Syntax(err)
        }
    }

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