Introduce Arc<dyn Trait> in Enum which impl PartialEq

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I'm not sure where the assignment is, but the 'static requirement is coming from the implicit lifetime in dyn MyTrait. This change fixes the problem:

-impl PartialEq for dyn MyTrait {
+impl PartialEq for dyn MyTrait + '_ {

Edit: At least, it does for references. The Box version is still broken:

error[E0507]: cannot move out of `*__arg1_0` which is behind a shared reference
  --> src/main.rs:22:30
   |
22 |                 *__self_0 == *__arg1_0,
   |                              ^^^^^^^^^ move occurs because `*__arg1_0` has type `Box<dyn MyTrait>`, which does not implement the `Copy` trait

(and similarly for Arc)