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error[E0277]: the trait bound `core::tile::MapLayer<'_> + 'static: std::marker::Sync` is not satisfied
  --> src/main.rs:14:8
   |
14 |     world.add_resource(Vec::<std::sync::Arc<std::sync::RwLock<&mut tile::GameMap>>>::new())
   |           ^^^^^^^^^^^^ `core::tile::MapLayer<'_> + 'static` cannot be shared between threads safely
   |
   = help: the trait `std::marker::Sync` is not implemented for `core::tile::MapLayer<'_> + 'static`
   = note: required because of the requirements on the impl of `std::marker::Sync` for `std::ptr::Unique<core::tile::MapLayer<'_> + 'static>`
   = note: required because it appears within the type `std::boxed::Box<core::tile::MapLayer<'_> + 'static>`
   = note: required because of the requirements on the impl of `std::marker::Sync` for `std::ptr::Unique<std::boxed::Box<core::tile::MapLayer<'_> + 'static>>`
   = note: required because it appears within the type `alloc::raw_vec::RawVec<std::boxed::Box<core::tile::MapLayer<'_> + 'static>>`
   = note: required because it appears within the type `std::vec::Vec<std::boxed::Box<core::tile::MapLayer<'_> + 'static>>`
   = note: required because it appears within the type `core::tile::GameMap<'_>`
   = note: required because it appears within the type `&mut core::tile::GameMap<'_>`
   = note: required because of the requirements on the impl of `std::marker::Sync` for `std::sync::RwLock<&mut core::tile::GameMap<'_>>`
   = note: required because of the requirements on the impl of `std::marker::Send` for `std::sync::Arc<std::sync::RwLock<&mut core::tile::GameMap<'_>>>`
   = note: required because of the requirements on the impl of `std::marker::Send` for `std::ptr::Unique<std::sync::Arc<std::sync::RwLock<&mut core::tile::GameMap<'_>>>>`
   = note: required because it appears within the type `alloc::raw_vec::RawVec<std::sync::Arc<std::sync::RwLock<&mut core::tile::GameMap<'_>>>>`
   = note: required because it appears within the type `std::vec::Vec<std::sync::Arc<std::sync::RwLock<&mut core::tile::GameMap<'_>>>>`
   = note: required because of the requirements on the impl of `shred::res::Resource` for `std::vec::Vec<std::sync::Arc<std::sync::RwLock<&mut core::tile::GameMap<'_>>>>`   

Ok, so now what?

Smaragdine.