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Record metadata for a struct implementing a trait. #2204

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Record metadata for a struct implementing a trait. #2204

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Commits on Sep 4, 2024

  1. Record metadata for a struct implementing a trait. 

    ```
#[uniffi::export]
impl MyTrait for MyObject { ... }
```

Currently works by ignoring `MyTrait`. This adds new metadata
to record it, allowing foreign bindings to implement things like
inheritance

Includes Python, Kotlin and Swift generating these sub-classes.
There's some undesirable re-wrapping when traits from these
objects gets passed back and forward, but seems to work surprisingly well.

Fixes mozilla#2196.
    @mhammond
    mhammond committed Sep 4, 2024
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