| // Copyright 2012-2014 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: pprust doesn't print hygiene output |
| |
| // Test that labels injected by macros do not break hygiene. This |
| // checks cases where the macros invocations are under the rhs of a |
| // let statement. |
| |
| // Issue #24278: The label/lifetime shadowing checker from #24162 |
| // conservatively ignores hygiene, and thus issues warnings that are |
| // both true- and false-positives for this test. |
| |
| macro_rules! loop_x { |
| ($e: expr) => { |
| // $e shouldn't be able to interact with this 'x |
| 'x: loop { $e } |
| } |
| } |
| |
| macro_rules! while_true { |
| ($e: expr) => { |
| // $e shouldn't be able to interact with this 'x |
| 'x: while 1 + 1 == 2 { $e } |
| } |
| } |
| |
| macro_rules! run_once { |
| ($e: expr) => { |
| // ditto |
| 'x: for _ in 0..1 { $e } |
| } |
| } |
| |
| pub fn main() { |
| let mut i = 0; |
| |
| let j: isize = { |
| 'x: loop { |
| // this 'x should refer to the outer loop, lexically |
| loop_x!(break 'x); |
| i += 1; |
| } |
| i + 1 |
| }; |
| assert_eq!(j, 1); |
| |
| let k: isize = { |
| 'x: for _ in 0..1 { |
| // ditto |
| loop_x!(break 'x); |
| i += 1; |
| } |
| i + 1 |
| }; |
| assert_eq!(k, 1); |
| |
| let l: isize = { |
| 'x: for _ in 0..1 { |
| // ditto |
| while_true!(break 'x); |
| i += 1; |
| } |
| i + 1 |
| }; |
| assert_eq!(l, 1); |
| |
| let n: isize = { |
| 'x: for _ in 0..1 { |
| // ditto |
| run_once!(continue 'x); |
| i += 1; |
| } |
| i + 1 |
| }; |
| assert_eq!(n, 1); |
| } |