Macro wgpu_bind_dsl::only_traits

macro_rules! only_traits {
    (Buffer ; ; ) => { ... };
    (Buffer ; Dyn ; ) => { ... };
    (Sampler ; ; ) => { ... };
    (Sampler ; Cmp ; ) => { ... };
    (StorageBuffer ; ; ) => { ... };
    (StorageBuffer ; Dyn ; ) => { ... };
    (StorageBuffer ; Readonly ; ) => { ... };
    (StorageBuffer ; Readonly ; Dyn) => { ... };
    (StorageBuffer ; Dyn ; Readonly) => { ... };
}

internal use only converts a type expression into its wgpu::BindingType equivalent. this only works for the subset of types that do not use the pseudo generics notation. which is to say Buffers, StorageBuffers, and Samplers.