33 lines
937 B
Rust
33 lines
937 B
Rust
|
// 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),
|
||
|
|
}
|