Commits on Jun 29, 2023

1. Added suport for using external types in proc-macros …

   Moved the FfiConverter implementation for callback interfaces and
   traits from a declarative macro in `uniffi_core` to a proc-macro in
   `uniffi_macros`.  This offers better `UniFfiTag` handling.  Now
   `FfiConverter` is implemented for all tags for callback
   interfaces/traits that are wrapped with the proc-macro attributes. This
   matches the behavior for other types and will help fix mozilla#1531.
   
   Changed the object FfiConverter to be inside a proc-macro, rather than
   using the `Interface` trait.  This more flexibility and avoids
   conflicting impls. For example, this allows for both the objects and
   trait interface `FfiConverters`s to be implemented on `Arc<T>`.  I also
   think it's nicer with less indirection. One drawback is that libraries
   can't implement `FfiConverter` on Arc<T> because of the orphan rules. To
   get around this, I added the `FfiConverterArc` trait.
   
   Other changes:
   - Adding `module_path` to the user type metadata
   - Added an proc-macro -> proc-macro external type test by copying the
     ext-types fixture into another one that uses proc macros.

   

   bendk committed Jun 29, 2023
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