77 lines
1.7 KiB
Rust
77 lines
1.7 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// ignore-pretty: pprust doesn't print hygiene output
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macro_rules! loop_x {
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($e: expr) => {
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// $e shouldn't be able to interact with this 'x
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'x: loop { $e }
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}
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}
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macro_rules! while_true {
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($e: expr) => {
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// $e shouldn't be able to interact with this 'x
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'x: while 1 + 1 == 2 { $e }
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}
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}
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macro_rules! run_once {
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($e: expr) => {
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// ditto
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'x: for _ in 0..1 { $e }
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}
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}
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pub fn main() {
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let mut i = 0;
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let j: isize = {
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'x: loop {
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// this 'x should refer to the outer loop, lexically
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loop_x!(break 'x);
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i += 1;
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}
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i + 1
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};
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assert_eq!(j, 1);
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let k: isize = {
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'x: for _ in 0..1 {
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// ditto
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loop_x!(break 'x);
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i += 1;
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}
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i + 1
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};
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assert_eq!(k, 1);
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let l: isize = {
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'x: for _ in 0..1 {
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// ditto
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while_true!(break 'x);
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i += 1;
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}
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i + 1
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};
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assert_eq!(l, 1);
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let n: isize = {
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'x: for _ in 0..1 {
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// ditto
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run_once!(continue 'x);
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i += 1;
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}
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i + 1
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};
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assert_eq!(n, 1);
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}
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