tests/ui/implied-bounds/impl-implied-bounds-compatibility.rs

   1 #![deny(implied_bounds_entailment)]
   2
   3 use std::cell::RefCell;
   4
   5 pub struct MessageListeners<'a> {
   6     listeners: RefCell<Vec<Box<dyn FnMut(()) + 'a>>>,
   7 }
   8
   9 pub trait MessageListenersInterface {
  10     fn listeners<'c>(&'c self) -> &'c MessageListeners<'c>;
  11 }
  12
  13 impl<'a> MessageListenersInterface for MessageListeners<'a> {
  14     fn listeners<'b>(&'b self) -> &'a MessageListeners<'b> {
  15         //~^ ERROR impl method assumes more implied bounds than the corresponding trait method
  16         //~| WARN this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
  17         self
  18     }
  19 }
  20
  21 fn main() {}