Migrate core to tokio 1.0

core/src/component.rs

@@ -35,29 +35,3 @@ macro_rules! component {
         }
     }
 }
-
-use std::cell::UnsafeCell;
-use std::sync::Mutex;
-
-pub(crate) struct Lazy<T>(Mutex<bool>, UnsafeCell<Option<T>>);
-unsafe impl<T: Sync> Sync for Lazy<T> {}
-unsafe impl<T: Send> Send for Lazy<T> {}
-
-#[cfg_attr(feature = "cargo-clippy", allow(mutex_atomic))]
-impl<T> Lazy<T> {
-    pub(crate) fn new() -> Lazy<T> {
-        Lazy(Mutex::new(false), UnsafeCell::new(None))
-    }
-
-    pub(crate) fn get<F: FnOnce() -> T>(&self, f: F) -> &T {
-        let mut inner = self.0.lock().unwrap();
-        if !*inner {
-            unsafe {
-                *self.1.get() = Some(f());
-            }
-            *inner = true;
-        }
-
-        unsafe { &*self.1.get() }.as_ref().unwrap()
-    }
-}