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    // Copyright 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.

    #![unstable(feature = "collections_range",
                reason = "waiting for dust to settle on inclusive ranges",
                issue = "30877")]

    //! Range syntax.

    use core::option::Option::{self, None, Some};
    use core::ops::{RangeFull, Range, RangeTo, RangeFrom};

    /// **RangeArgument** is implemented by Rust's built-in range types, produced
    /// by range syntax like `..`, `a..`, `..b` or `c..d`.
    pub trait RangeArgument<T> {
        /// Start index (inclusive)
        ///
        /// Return start value if present, else `None`.
        fn start(&self) -> Option<&T> {
            None
        }

        /// End index (exclusive)
        ///
        /// Return end value if present, else `None`.
        fn end(&self) -> Option<&T> {
            None
        }
    }

    // FIXME add inclusive ranges to RangeArgument

    impl<T> RangeArgument<T> for RangeFull {}

    impl<T> RangeArgument<T> for RangeFrom<T> {
        fn start(&self) -> Option<&T> {
            Some(&self.start)
        }
    }

    impl<T> RangeArgument<T> for RangeTo<T> {
        fn end(&self) -> Option<&T> {
            Some(&self.end)
        }
    }

    impl<T> RangeArgument<T> for Range<T> {
        fn start(&self) -> Option<&T> {
            Some(&self.start)
        }
        fn end(&self) -> Option<&T> {
            Some(&self.end)
        }
    }

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