specs junk

gistfile1.txt

// This works...
        use specs::Join;
        let world = self.planner.mut_world();
        let r1 = world.read::<CPosition>();

        for pos in r1.iter() {
            println!("Position is: {:?}", pos);
        }

gistfile2.txt

// This does not...
        use specs::Join;

        let world = self.planner.mut_world();
        let r1 = world.read::<CPosition>();
        let r2 = world.read::<CPlayer>();

        for (pos, player) in (r1, r2).iter() {
            println!("Position is: {:?}", pos);
        }

gistfile3.txt

With this error:

rror: no method named `iter` found for type `(specs::Storage<CPosition, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPosition>>>, specs::Storage<CPlayer, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPlayer>>>)` in the current scope
   --> src/main.rs:108:39
    |
108 |         for (pos, player) in (r1, r2).iter() {
    |                                       ^^^^
    |
    = note: the method `iter` exists but the following trait bounds were not satisfied: `specs::Storage<CPosition, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPosition>>> : specs::Join`, `specs::Storage<CPlayer, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPlayer>>> : specs::Join`, `specs::Storage<CPosition, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPosition>>> : specs::Join`, `specs::Storage<CPlayer, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPlayer>>> : specs::Join`

Even if it's just an a single item in the tuple:

error: no method named iter found for type
(specs::Storage<CPosition, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPosition>>>,) in the current scope
--> src/main.rs:108:39
|
108 | for (pos,) in (r1,).iter() {
| ^^^^
|
= note: the method iter exists but the following trait bounds were not satisfied:
specs::Storage<CPosition, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPosition>>> : specs::Join,
specs::Storage<CPosition, std::sync::RwLockReadGuard<'_, specs::Allocator>, std::sync::RwLockReadGuard<'_, specs::MaskedStorage<CPosition>>> : specs::Join