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# Objective System param validation warnings should be configurable and default to "warn once" (per system). Fixes: #15391 ## Solution `SystemMeta` is given a new `ParamWarnPolicy` field. The policy decides whether warnings will be emitted by each system param when it fails validation. The policy is updated by the system after param validation fails. Example warning: ``` 2024-09-30T18:10:04.740749Z WARN bevy_ecs::system::function_system: System fallible_params::do_nothing_fail_validation will not run because it requested inaccessible system parameter Single<(), (With<Player>, With<Enemy>)> ``` Currently, only the first invalid parameter is displayed. Warnings can be disabled on function systems using `.param_never_warn()`. (there is also `.with_param_warn_policy(policy)`) ## Testing Ran `fallible_params` example. --------- Co-authored-by: SpecificProtagonist <vincentjunge@posteo.net> |
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