mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 14:55:26 +00:00
27 lines
532 B
Rust
27 lines
532 B
Rust
// 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>()?)
|
|
}
|