gistfile1.rs

pub trait ToMessageHandler {
  fn to_message_handler<'a>(self) -> Box<MessageHandler + 'a>;
}

impl <'b, F> ToMessageHandler for F where F : Fn(&Frame) -> AckOrNack + 'b {
  fn to_message_handler<'a>(self) -> Box<MessageHandler + 'a> {
    Box::new(ClosureMessageHandler{closure : self}) as Box<MessageHandler>
  }
}

// ERROR
subscription.rs:90:5: 90:75 error: the parameter type `F` may not live long enough [E0309]
subscription.rs:90     Box::new(ClosureMessageHandler{closure : self}) as Box<MessageHandler>
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
subscription.rs:90:5: 90:75 help: consider adding an explicit lifetime bound `F: 'a`...
subscription.rs:90     Box::new(ClosureMessageHandler{closure : self}) as Box<MessageHandler>
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
subscription.rs:90:5: 90:75 note: ...so that it can be closed over into an object
subscription.rs:90     Box::new(ClosureMessageHandler{closure : self}) as Box<MessageHandler>
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~