Commits on Jul 1, 2023

1. Support trait objects for source in Error …

   If you used boxed `dyn Error` traits as a source a compile error would
   occur:
   ```
    --> tests/error/derives_for_enums_with_source.rs:5:17
     |
   5 | #[derive(Debug, Error)]
     |                 ^^^^^ doesn't have a size known at compile-time
     |
     = help: the trait `Sized` is not implemented for `(dyn std::error::Error + Send + 'static)`
     = help: the trait `std::error::Error` is implemented for `Box<T>`
     = note: required for `Box<(dyn std::error::Error + Send + 'static)>` to implement `std::error::Error`
     = note: required for the cast from `Box<(dyn std::error::Error + Send + 'static)>` to the object type `dyn std::error::Error`
     = note: this error originates in the derive macro `Error` (in Nightly builds, run with -Z macro-backtrace for more info)
   ```
   
   This fixes that by shamelessly "borrowing" a fix from [`thiserror`].
   
   [`thiserror`]: https://github.com/dtolnay/thiserror
   
   Fixes #122
   
   Redid this commit, because I accidentally pushed to master without a PR.

   

   JelteF committed Jul 1, 2023
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