rtfm_non_generic_mutex.rs

use rtfm::Mutex; // or mutex_trait

pub enum Operation<T: Mutex<T = ...> {
  FileSystem(T) // Note: can't use impl Mutex<T = Filesystem> here, so we have to introduce the T type param
  // ...
}

// If the `Operation` enum is buried deep within a type, it poisens that type with the same type parameter
pub struct Server<T: Mutex<T = ...> {
  op: Operation<T>
}

// question: is it possible to avoid the generic type parameter when using any Mutex with rtfm?

// internally, rtfm uses resource proxies that implement the Mutex trait. 
// Is it safe to use these types or are they considered an implementation detail?
// I'm guessing the latter as `mod Resources` is private