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.
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.
11 // `expr?` expands to:
15 // Err(err) => return Err(From::from(err)),
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.
21 use std::num::ParseIntError;
24 assert_eq!(parse(), Ok(1));
27 fn parse() -> Result<i32, ParseIntError> {
28 const val: char = 'a';
29 const err: char = 'b';
31 Ok("1".parse::<i32>()?)