24 lines
542 B
Rust
24 lines
542 B
Rust
#![feature(try_trait)]
|
|
|
|
use std::ops::Try;
|
|
|
|
fn main() {
|
|
// error for a `Try` type on a non-`Try` fn
|
|
std::fs::File::open("foo")?; //~ ERROR the `?` operator can only
|
|
|
|
// a non-`Try` type on a non-`Try` fn
|
|
()?; //~ ERROR the `?` operator can only
|
|
|
|
// an unrelated use of `Try`
|
|
try_trait_generic::<()>(); //~ ERROR the trait bound
|
|
}
|
|
|
|
|
|
|
|
fn try_trait_generic<T: Try>() -> T {
|
|
// and a non-`Try` object on a `Try` fn.
|
|
()?; //~ ERROR the `?` operator can only be applied to values that implement `Try`
|
|
|
|
loop {}
|
|
}
|