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Mark DynamicPluginLoadError
internal error types as source (#11618)
# Objective - [`thiserror`](https://docs.rs/thiserror/) is used to derive the error type on `bevy_dynamic_plugin`'s [`DynamicPluginLoadError`](https://docs.rs/bevy_dynamic_plugin/latest/bevy_dynamic_plugin/enum.DynamicPluginLoadError.html). - It is an enum where each variant wraps a `libloading` error type. - `thiserror` supports marking this internal error types as `#[source]` so it can automatically fill out the [`Error::source`](https://doc.rust-lang.org/std/error/trait.Error.html#method.source) method. - This allows other error handling libraries to get more information about the error than what Bevy by default provides. It increases interoperability between libraries. ## Solution - Mark the internal `libloading::Error` of `DynamicPluginLoadError` with `#[source]`. --- ## Changelog - Implemented the [`Error::source`](https://doc.rust-lang.org/std/error/trait.Error.html#method.source) method for [`DynamicPluginLoadError`](https://docs.rs/bevy_dynamic_plugin/latest/bevy_dynamic_plugin/enum.DynamicPluginLoadError.html). --- Here is the output from `cargo-expand` before and after the change. ```rust // Before impl Error for DynamicPluginLoadError {} ``` ```rust // After impl Error for DynamicPluginLoadError { fn source(&self) -> Option<&(dyn Error + 'static)> { use thiserror::__private::AsDynError as _; match self { DynamicPluginLoadError::Library { 0: source, .. } => { Some(source.as_dyn_error()) } DynamicPluginLoadError::Plugin { 0: source, .. } => { Some(source.as_dyn_error()) } } } } ```
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@ -8,9 +8,9 @@ use bevy_app::{App, CreatePlugin, Plugin};
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#[derive(Debug, Error)]
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pub enum DynamicPluginLoadError {
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#[error("cannot load library for dynamic plugin: {0}")]
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Library(libloading::Error),
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Library(#[source] libloading::Error),
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#[error("dynamic library does not contain a valid Bevy dynamic plugin")]
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Plugin(libloading::Error),
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Plugin(#[source] libloading::Error),
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}
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/// Dynamically links a plugin at the given path. The plugin must export a function with the
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