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# Objective Fixes https://github.com/bevyengine/bevy/issues/14518 ## Solution Added `QueryData` implementer similarly to how `ParamSet` is implemented ## Testing 2 doc tests and 3 tests that are adapted forms of the same...

## What problem does this solve or what need does it fill? In generic contexts, or when you have really complex `QueryData` parameters, there is currently no way to have...

Getting `QueryState` from immutable `World` reference

1

# Objective There is currently no way of getting `QueryState` from `&World`, so it is hard to, for example, iterate over all entities with a component, only having `&World`. ##...

# Objective Outside of the `bevy_ecs` crate it's hard to implement `SystemParam` trait on params that require access to the `World`, because `init_state` expects user to extend access in `SystemMeta`...

`SystemRunner` param - run systems inside other systems

14

## What problem does this solve or what need does it fill? Currently ways of running systems from other systems are very limited. This proposal aims to provide a way...