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1a4d82fc | 1 | // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
223e47cc LB |
2 | // file at the top-level directory of this distribution and at |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
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. | |
10 | ||
c34b1796 | 11 | |
1a4d82fc JJ |
12 | macro_rules! higher_order { |
13 | (subst $lhs:tt => $rhs:tt) => ({ | |
14 | macro_rules! anon { $lhs => $rhs } | |
85aaf69f | 15 | anon!(1_usize, 2_usize, "foo") |
1a4d82fc | 16 | }); |
223e47cc LB |
17 | } |
18 | ||
5bcae85e SL |
19 | macro_rules! outer { |
20 | ($x:expr; $fragment:ident) => { | |
21 | macro_rules! inner { ($y:$fragment) => { $x + $y } } | |
22 | } | |
23 | } | |
24 | ||
223e47cc | 25 | fn main() { |
1a4d82fc JJ |
26 | let val = higher_order!(subst ($x:expr, $y:expr, $foo:expr) => (($x + $y, $foo))); |
27 | assert_eq!(val, (3, "foo")); | |
5bcae85e SL |
28 | |
29 | outer!(2; expr); | |
30 | assert_eq!(inner!(3), 5); | |
223e47cc | 31 | } |