d9113cca6f
# Objective When using `PhantomData` fields with the `#[derive(SystemParam)]` or `#[derive(WorldQuery)]` macros, the user is required to add the `#[system_param(ignore)]` attribute so that the macro knows to treat that field specially. This is undesirable, since it makes the macro more fragile and less consistent. ## Solution Implement `SystemParam` and `WorldQuery` for `PhantomData`. This makes the `ignore` attributes unnecessary. Some internal changes make the derive macro compatible with types that have invariant lifetimes, which fixes #8192. From what I can tell, this fix requires `PhantomData` to implement `SystemParam` in order to ensure that all of a type's generic parameters are always constrained. --- ## Changelog + Implemented `SystemParam` and `WorldQuery` for `PhantomData<T>`. + Fixed a miscompilation caused when invariant lifetimes were used with the `SystemParam` macro. |
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| .. | ||
| entity | ||
| query | ||
| schedule | ||
| storage | ||
| system | ||
| world | ||
| archetype.rs | ||
| bundle.rs | ||
| change_detection.rs | ||
| component.rs | ||
| event.rs | ||
| lib.rs | ||
| reflect.rs | ||
| removal_detection.rs | ||