// ignore-cloudabi no std::fs support #![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 { // and a non-`Try` object on a `Try` fn. ()?; //~ ERROR the `?` operator can only loop {} }