| //@ run-pass | |
| #![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>()?) | |
| } |