| #![feature(generator_trait)] |
| #![feature(generators)] |
| |
| // Test that we cannot create a generator that returns a value of its |
| // own type. |
| |
| use std::ops::Generator; |
| |
| pub fn want_cyclic_generator_return<T>(_: T) |
| where T: Generator<Yield = (), Return = T> |
| { |
| } |
| |
| fn supply_cyclic_generator_return() { |
| want_cyclic_generator_return(|| { |
| //~^ ERROR closure/generator type that references itself |
| if false { yield None.unwrap(); } |
| None.unwrap() |
| }) |
| } |
| |
| pub fn want_cyclic_generator_yield<T>(_: T) |
| where T: Generator<Yield = T, Return = ()> |
| { |
| } |
| |
| fn supply_cyclic_generator_yield() { |
| want_cyclic_generator_yield(|| { |
| //~^ ERROR type mismatch |
| if false { yield None.unwrap(); } |
| None.unwrap() |
| }) |
| } |
| |
| fn main() { } |