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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(generators, generator_trait)]
use std::ops::{GeneratorState, Generator};
struct W<T>(T);
// This impl isn't safe in general, but the generator used in this test is movable
// so it won't cause problems.
impl<T: Generator<Return = ()>> Iterator for W<T> {
type Item = T::Yield;
fn next(&mut self) -> Option<Self::Item> {
match unsafe { self.0.resume() } {
GeneratorState::Complete(..) => None,
GeneratorState::Yielded(v) => Some(v),
}
}
}
fn test() -> impl Generator<Return=(), Yield=u8> {
|| {
for i in 1..6 {
yield i
}
}
}
fn main() {
let end = 11;
let closure_test = |start| {
move || {
for i in start..end {
yield i
}
}
};
assert!(W(test()).chain(W(closure_test(6))).eq(1..11));
}
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