| // Copyright 2015 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. |
| |
| // Issue 22443: Reject code using non-regular types that would |
| // otherwise cause dropck to loop infinitely. |
| // |
| // This version is just checking that we still sanely handle a trivial |
| // wrapper around the non-regular type. (It also demonstrates how the |
| // error messages will report different types depending on which type |
| // dropck is analyzing.) |
| |
| use std::marker::PhantomData; |
| |
| struct Digit<T> { |
| elem: T |
| } |
| |
| struct Node<T:'static> { m: PhantomData<&'static T> } |
| |
| enum FingerTree<T:'static> { |
| Single(T), |
| // According to the bug report, Digit before Box would infinite loop. |
| Deep( |
| Digit<T>, |
| Box<FingerTree<Node<T>>>, |
| ) |
| } |
| |
| enum Wrapper<T:'static> { |
| Simple, |
| Other(FingerTree<T>), |
| } |
| |
| fn main() { |
| let w = //~ ERROR overflow while adding drop-check rules for std::option |
| Some(Wrapper::Simple::<u32>); |
| //~^ ERROR overflow while adding drop-check rules for std::option::Option |
| //~| ERROR overflow while adding drop-check rules for Wrapper |
| } |