rust/src/test/run-pass/issue-15189.rs

// Copyright 2014 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.

// ignore-pretty

#![feature(macro_rules)]

macro_rules! third(($e:expr)=>({let x = 2; $e[x]}));

fn main() {
    let x = vec!(10u,11u,12u,13u);
    let t = third!(x);
    assert_eq!(t,12u);
}
work around 15189 in test cases 2014-06-26 00:08:08 +00:00			`// Copyright 2014 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.`

			`// ignore-pretty`

			`#![feature(macro_rules)]`

librustc: Always parse `macro!()`/`macro![]` as expressions if not followed by a semicolon. This allows code like `vec![1i, 2, 3].len();` to work. This breaks code that uses macros as statements without putting semicolons after them, such as: fn main() { ... assert!(a == b) assert!(c == d) println(...); } It also breaks code that uses macros as items without semicolons: local_data_key!(foo) fn main() { println("hello world") } Add semicolons to fix this code. Those two examples can be fixed as follows: fn main() { ... assert!(a == b); assert!(c == d); println(...); } local_data_key!(foo); fn main() { println("hello world") } RFC #378. Closes #18635. [breaking-change] 2014-11-14 17:18:10 +00:00			`macro_rules! third(($e:expr)=>({let x = 2; $e[x]}));`
work around 15189 in test cases 2014-06-26 00:08:08 +00:00
			`fn main() {`
			`let x = vec!(10u,11u,12u,13u);`
			`let t = third!(x);`
			`assert_eq!(t,12u);`
			`}`