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Imported Upstream version 1.9.0+dfsg1
[rustc.git] / src / test / run-pass / try-operator-hygiene.rs
1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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
11 // `expr?` expands to:
12 //
13 // match expr {
14 // Ok(val) => val,
15 // Err(err) => return Err(From::from(err)),
16 // }
17 //
18 // This test verifies that the expansion is hygienic, i.e. it's not affected by other `val` and
19 // `err` bindings that may be in scope.
20
21 #![feature(question_mark)]
22
23 use std::num::ParseIntError;
24
25 fn main() {
26 assert_eq!(parse(), Ok(1));
27 }
28
29 fn parse() -> Result<i32, ParseIntError> {
30 const val: char = 'a';
31 const err: char = 'b';
32
33 Ok("1".parse::<i32>()?)
34 }