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Apr 23rd, 2018
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  1. trait Foo {
  2. fn foo(&self) -> u32;
  3. }
  4.  
  5. struct Bar(u32);
  6.  
  7. impl Foo for Bar {
  8. fn foo(&self) -> u32 {
  9. self.0
  10. }
  11. }
  12.  
  13. fn main() {
  14. let bar = Bar(123);
  15. let bar_dyn: Box<Foo> = Box::new(Bar(123));
  16. println!("{}", bar.foo());
  17. println!("{}", Foo::foo(&bar));
  18. println!("{}", bar_dyn.foo());
  19. println!("{}", Foo::foo(&bar_dyn)); // ERROR
  20. }
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