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update CONTRIBUTING.md section about syn

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Christian Poveda 2022-09-23 15:24:19 -05:00 committed by Emilio Cobos Álvarez
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CONTRIBUTING.md
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@ -323,14 +323,12 @@ generated Rust code are implemented using the [`syn`](https://docs.rs/syn) crate
### Implementing new options using `syn`
Here is a list of recommendations to be followed if a new option can be
implemented using the `syn` crate:
If a new option can be implemented using the `syn` crate it should be added to
the `codegen::postprocessing` module by following these steps:
- The `BindgenOptions::require_syn` method must be updated to reflect that this
new option requires parsing the generated Rust code with `syn`.
- The implementation of the new option should be added at the end of
`Bindings::generate`, inside the `if options.require_syn() { ... }` block.
- Introduce a new `struct` with no fields.
- Implement the `PostProcessing` trait for the `struct`.
- Add the `struct` to the `decl_postprocessing` macro invocation.
## Pull Requests and Code Reviews