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# Objective The goal of this PR is to introduce `SystemParam` validation in order to reduce runtime panics. Fixes #15265 ## Solution `SystemParam` now has a new method `validate_param(...) -> bool`, which takes immutable variants of `get_param` arguments. The returned value indicates whether the parameter can be acquired from the world. If parameters cannot be acquired for a system, it won't be executed, similarly to run conditions. This reduces panics when using params like `Res`, `ResMut`, etc. as well as allows for new, ergonomic params like #15264 or #15302. Param validation happens at the level of executors. All validation happens directly before executing a system, in case of normal systems they are skipped, in case of conditions they return false. Warning about system skipping is primitive and subject to change in subsequent PRs. ## Testing Two executor tests check that all executors: - skip systems which have invalid parameters: - piped systems get skipped together, - dependent systems still run correctly, - skip systems with invalid run conditions: - system conditions have invalid parameters, - system set conditions have invalid parameters. |
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| .. | ||
| primitives | ||
| aabb.rs | ||
| arcs.rs | ||
| arrows.rs | ||
| circles.rs | ||
| config.rs | ||
| cross.rs | ||
| curves.rs | ||
| gizmos.rs | ||
| grid.rs | ||
| lib.rs | ||
| light.rs | ||
| line_joints.wgsl | ||
| lines.wgsl | ||
| pipeline_2d.rs | ||
| pipeline_3d.rs | ||
| rounded_box.rs | ||