| // 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 |
| } |