"proc-macro derive panicked" when deriving WorldQuery.

Bevy version

0.7.0

Operating system & version

Pop_OS! 21.10

What you did

#[derive(Component)]
struct Comp1;

#[derive(Component)]
struct Comp2;

#[derive(Component)]
struct Comp3;

#[derive(WorldQuery)]
struct WithoutComps {
  _1: Without<Comp1>,
  _2: Without<Comp2>,
  _3: Without<Comp3>
}

What you expected to happen

The project to compile.

What actually happened

$ cargo run
   Compiling somegame v0.1.0 (/home/pancake/Documents/dev/rust/somegame)
error: proc-macro derive panicked
  --> src/main.rs:29:10
   |
29 | #[derive(WorldQuery)]
   |          ^^^^^^^^^^
   |
   = help: message: called `Option::unwrap()` on a `None` value

I'm getting

error: proc-macro derive panicked
  --> src/main.rs:16:10
   |
16 | #[derive(WorldQuery)]
   |          ^^^^^^^^^^
   |
   = help: message: Expected a struct with a lifetime

instead when using bevy_ecs directly.

With the help of @Gibonus on discord, the fix for this is:

#[derive(WorldQuery)]
struct WithoutComps<'w> {
  _1: Without<Comp1>,
  _2: Without<Comp2>,
  _3: Without<Comp3>,
  #[world_query(ignore)]
  _fix: Option<&'w ()>
}

This has been fixed by #3001

#[derive(WorldQuery)]
struct Foo {
    _1: Without<A>,
   _2: Without<B>,
    _3: Without<C>
}

will just work:tm: now

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"proc-macro derive panicked" when deriving WorldQuery. #4533

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"proc-macro derive panicked" when deriving WorldQuery. #4533

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bjorn3 commented on Apr 19, 2022

CGMossa commented on Apr 19, 2022

BoxyUwU commented on Apr 28, 2022

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