cb93c24bf3
Do not add leading asterisk in the `PartialEq` I think we should address this issue, however I am not exactly sure, if this is the right way to do it. It is related to the #123056. Imagine the simplified code: ```rust trait MyTrait {} impl PartialEq for dyn MyTrait { fn eq(&self, _other: &Self) -> bool { true } } #[derive(PartialEq)] enum Bar { Foo(Box<dyn MyTrait>), } ``` On the nightly compiler, the `derive` produces invalid code with the weird error message: ``` error[E0507]: cannot move out of `*__arg1_0` which is behind a shared reference --> src/main.rs:11:9 | 9 | #[derive(PartialEq)] | --------- in this derive macro expansion 10 | enum Things { 11 | Foo(Box<dyn MyTrait>), | ^^^^^^^^^^^^^^^^ move occurs because `*__arg1_0` has type `Box<dyn MyTrait>`, which does not implement the `Copy` trait | = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info) ``` It may be related to the perfect derive problem, although requiring the _type_ to be `Copy` seems unfortunate because it is not necessary. Besides, we are adding the extra dereference only for the diagnostics? |
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