43 lines
1.0 KiB
Rust
43 lines
1.0 KiB
Rust
// Copyright 2012 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.
|
|
|
|
// xfail-pretty - token trees can't pretty print
|
|
|
|
macro_rules! myfn(
|
|
( $f:ident, ( $( $x:ident ),* ), $body:block ) => (
|
|
fn $f( $( $x : int),* ) -> int $body
|
|
)
|
|
)
|
|
|
|
myfn!(add, (a,b), { return a+b; } )
|
|
|
|
pub fn main() {
|
|
|
|
macro_rules! mylet(
|
|
($x:ident, $val:expr) => (
|
|
let $x = $val;
|
|
)
|
|
);
|
|
|
|
mylet!(y, 8*2);
|
|
assert!((y == 16));
|
|
|
|
myfn!(mult, (a,b), { a*b } );
|
|
|
|
assert!((mult(2, add(4,4)) == 16));
|
|
|
|
macro_rules! actually_an_expr_macro (
|
|
() => ( 16 )
|
|
)
|
|
|
|
assert!({ actually_an_expr_macro!() } == 16);
|
|
|
|
}
|