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Impl Try for Option #42526

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Sep 30, 2017
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25 changes: 25 additions & 0 deletions src/test/ui/suggestions/try-on-option.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
// 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(try_trait)]

fn main() {}

fn foo() -> Result<u32, ()> {
let x: Option<u32> = None;
x?;
Ok(22)
}

fn bar() -> u32 {
let x: Option<u32> = None;
x?;
22
}
22 changes: 22 additions & 0 deletions src/test/ui/suggestions/try-on-option.stderr
Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
error[E0277]: the trait bound `(): std::convert::From<std::option::NoneError>` is not satisfied
--> $DIR/try-on-option.rs:17:5
|
17 | x?;
| ^^ the trait `std::convert::From<std::option::NoneError>` is not implemented for `()`
|
= note: required by `std::convert::From::from`

error[E0277]: the `?` operator can only be used in a function that returns `Result` (or another type that implements `std::ops::Try`)
--> $DIR/try-on-option.rs:23:5
|
23 | x?;
| --
| |
| cannot use the `?` operator in a function that returns `u32`
| in this macro invocation
|
= help: the trait `std::ops::Try` is not implemented for `u32`
= note: required by `std::ops::Try::from_error`

error: aborting due to 2 previous errors