| // Copyright 2015 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(unused_imports)] |
| // Test a regression found when building compiler. The `produce()` |
| // error type `T` winds up getting unified with result of `x.parse()`; |
| // the type of the closure given to `unwrap_or_else` needs to be |
| // inferred to `usize`. |
| |
| use std::num::ParseIntError; |
| |
| fn produce<T>() -> Result<&'static str, T> { |
| Ok("22") |
| } |
| |
| fn main() { |
| let x: usize = produce() |
| .and_then(|x| x.parse()) |
| .unwrap_or_else(|_| panic!()); |
| println!("{}", x); |
| } |
