// Copyright 2017 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.

macro_rules! enum_number {
    ($name:ident { $($variant:ident = $value:expr, )* }) => {
        enum $name {
            $($variant = $value,)*
        }

        fn foo(value: i32) -> Option<$name> {
            match value {
                $( $value => Some($name::$variant), )* // PatKind::Lit
                $( $value ... 42 => Some($name::$variant), )* // PatKind::Range
                _ => None
            }
        }
    }
}

enum_number!(Change {
    Pos = 1,
    Neg = -1,
    Arith = 1 + 1, //~ ERROR arbitrary expressions aren't allowed in patterns
                   //~^ ERROR only char and numeric types are allowed in range patterns
});

fn main() {}