bevycheck

Bevycheck helps debug bevy errors by adding procedural macros which aid the compiler in emitting better compilation errors.

If you get an error like the trait `IntoSystem<(), (), _>` is not implemented for fn item `for<'a> fn(bevy::prelude::ResMut<'a, [type error]>) {system}, simply add #[bevycheck::system] to your function, and a more helpful error messages should appear:

```rust

[bevycheck::system]

fn system(commands: &mut Commands, query: Query<(Entity, &GlobalTransform)>) { // ... } ```

How does it work?

It works by replacing rust fn system(commands: &mut Commands, query: Query<(Entity, &GlobalTransform)>) { // ... } with rust fn system() { assert_is_system_param::<&mut Commands>(); assert_is_system_param::<Query<(Entity, &GlobalTransform)>>(); panic!("remove bevycheck before running"); } That way, without parameters the system is a valid system and the add_system call doesn't error anymore, and by asserting that each specific parameter must be a valid system param, rust can figure out which one's the culprit and print a more directed error message.

Bevy support table

|bevy|bevycheck| |---|---| |0.10|0.5| |0.9|0.4| |0.7|0.3| |0.6|0.2| |0.5|0.1|