| // 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. |
| |
| use std::ops::Deref; |
| |
| fn main() { |
| if env_var("FOOBAR").as_ref().map(Deref::deref).ok() == Some("yes") { |
| panic!() |
| } |
| |
| let env_home: Result<String, ()> = Ok("foo-bar-baz".to_string()); |
| let env_home = env_home.as_ref().map(Deref::deref).ok(); |
| |
| if env_home == Some("") { panic!() } |
| } |
| |
| #[inline(never)] |
| fn env_var(s: &str) -> Result<String, VarError> { |
| Err(VarError::NotPresent) |
| } |
| |
| pub enum VarError { |
| NotPresent, |
| NotUnicode(String), |
| } |
