std::ops::Try impl for std::task::Poll

src/test/ui/try-poll.rs

@@ -0,0 +1,61 @@
+// Copyright 2018 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.
+
+// compile-pass
+
+#![allow(dead_code, unused)]
+#![feature(futures_api)]
+
+use std::task::Poll;
+
+struct K;
+struct E;
+
+fn as_result() -> Result<(), E> {
+    // From Result
+    let K = Ok::<K, E>(K)?;
+
+    // From Poll<Result>
+    let _: Poll<K> = Poll::Ready::<Result<K, E>>(Ok(K))?;
+
+    // From Poll<Option<Result>>
+    let _: Poll<Option<K>> = Poll::Ready::<Option<Result<K, E>>>(None)?;
+
+    Ok(())
+}
+
+fn as_poll_result() -> Poll<Result<(), E>> {
+    // From Result
+    let K = Ok::<K, E>(K)?;
+
+    // From Poll<Result>
+    let _: Poll<K> = Poll::Ready::<Result<K, E>>(Ok(K))?;
+
+    // From Poll<Option<Result>>
+    let _: Poll<Option<K>> = Poll::Ready::<Option<Result<K, E>>>(None)?;
+
+    Poll::Ready(Ok(()))
+}
+
+fn as_poll_option_result() -> Poll<Option<Result<(), E>>> {
+    // From Result
+    let K = Ok::<K, E>(K)?;
+
+    // From Poll<Result>
+    let _: Poll<K> = Poll::Ready::<Result<K, E>>(Ok(K))?;
+
+    // From Poll<Option<Result>>
+    let _: Poll<Option<K>> = Poll::Ready::<Option<Result<K, E>>>(None)?;
+
+    Poll::Ready(Some(Ok(())))
+}
+
+fn main() {
+}