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// Copyright 2017 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.
#![feature(catch_expr)]
struct catch {}
pub fn main() {
let catch_result: Option<_> = do catch {
let x = 5;
x
};
assert_eq!(catch_result, Some(5));
let mut catch = true;
while catch { catch = false; }
assert_eq!(catch, false);
catch = if catch { false } else { true };
assert_eq!(catch, true);
match catch {
_ => {}
};
let catch_err: Result<_, i32> = do catch {
Err(22)?;
1
};
assert_eq!(catch_err, Err(22));
let catch_okay: Result<i32, i32> = do catch {
if false { Err(25)?; }
Ok::<(), i32>(())?;
28
};
assert_eq!(catch_okay, Ok(28));
let catch_from_loop: Result<i32, i32> = do catch {
for i in 0..10 {
if i < 5 { Ok::<i32, i32>(i)?; } else { Err(i)?; }
}
22
};
assert_eq!(catch_from_loop, Err(5));
let cfg_init;
let _res: Result<(), ()> = do catch {
cfg_init = 5;
};
assert_eq!(cfg_init, 5);
let cfg_init_2;
let _res: Result<(), ()> = do catch {
cfg_init_2 = 6;
Err(())?;
};
assert_eq!(cfg_init_2, 6);
let my_string = "test".to_string();
let res: Result<&str, ()> = do catch {
// Unfortunately, deref doesn't fire here (#49356)
&my_string[..]
};
assert_eq!(res, Ok("test"));
let my_opt: Option<_> = do catch { () };
assert_eq!(my_opt, Some(()));
let my_opt: Option<_> = do catch { };
assert_eq!(my_opt, Some(()));
}
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