| // Copyright 2016 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. |
| |
| #![allow(non_upper_case_globals)] |
| #![allow(dead_code)] |
| // `expr?` expands to: |
| // |
| // match expr { |
| // Ok(val) => val, |
| // Err(err) => return Err(From::from(err)), |
| // } |
| // |
| // This test verifies that the expansion is hygienic, i.e. it's not affected by other `val` and |
| // `err` bindings that may be in scope. |
| |
| use std::num::ParseIntError; |
| |
| fn main() { |
| assert_eq!(parse(), Ok(1)); |
| } |
| |
| fn parse() -> Result<i32, ParseIntError> { |
| const val: char = 'a'; |
| const err: char = 'b'; |
| |
| Ok("1".parse::<i32>()?) |
| } |
