1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 macro_rules! enum_number {
12 ($name:ident { $($variant:ident = $value:expr, )* }) => {
14 $($variant = $value,)*
17 fn foo(value: i32) -> Option<$name> {
19 $( $value => Some($name::$variant), )* // PatKind::Lit
20 $( $value ..= 42 => Some($name::$variant), )* // PatKind::Range
30 Arith = 1 + 1, //~ ERROR arbitrary expressions aren't allowed in patterns
31 //~^ ERROR only char and numeric types are allowed in range patterns