| // Copyright 2014 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. |
| |
| fn id<T>(x: T) -> T { x } |
| |
| struct StateMachineIter<'a> { |
| statefn: &'a StateMachineFunc<'a> |
| } |
| |
| type StateMachineFunc<'a> = fn(&mut StateMachineIter<'a>) -> Option<&'static str>; |
| |
| impl<'a> Iterator for StateMachineIter<'a> { |
| type Item = &'static str; |
| |
| fn next(&mut self) -> Option<&'static str> { |
| return (*self.statefn)(self); |
| } |
| } |
| |
| fn state1(self_: &mut StateMachineIter) -> Option<&'static str> { |
| self_.statefn = &id(state2 as StateMachineFunc); |
| //~^ ERROR borrowed value does not live long enough |
| return Some("state1"); |
| } |
| |
| fn state2(self_: &mut StateMachineIter) -> Option<(&'static str)> { |
| self_.statefn = &id(state3 as StateMachineFunc); |
| //~^ ERROR borrowed value does not live long enough |
| return Some("state2"); |
| } |
| |
| fn state3(self_: &mut StateMachineIter) -> Option<(&'static str)> { |
| self_.statefn = &id(finished as StateMachineFunc); |
| //~^ ERROR borrowed value does not live long enough |
| return Some("state3"); |
| } |
| |
| fn finished(_: &mut StateMachineIter) -> Option<(&'static str)> { |
| return None; |
| } |
| |
| fn state_iter() -> StateMachineIter<'static> { |
| StateMachineIter { |
| statefn: &id(state1 as StateMachineFunc) |
| //~^ ERROR borrowed value does not live long enough |
| } |
| } |
| |
| |
| fn main() { |
| let mut it = state_iter(); |
| println!("{:?}",it.next()); |
| println!("{:?}",it.next()); |
| println!("{:?}",it.next()); |
| println!("{:?}",it.next()); |
| println!("{:?}",it.next()); |
| } |