Lots of owork on a calculator example, transparency, etc.

lib/runtime/src/time.rs

@@ -3,14 +3,14 @@
 //! These helpers integrate with the runtime's timer queue and are designed to be used from
 //! futures scheduled with [`crate::queue_future`] or one of the runtime entry macros.
 
-use std::cell::{Cell, RefCell};
-use std::fmt;
-use std::future::{Future, poll_fn};
-use std::pin::Pin;
-use std::rc::Rc;
-use std::task::Waker;
-use std::task::{Context, Poll};
-use std::time::Duration;
+use alloc::rc::Rc;
+use core::cell::{Cell, RefCell};
+use core::fmt;
+use core::future::{Future, poll_fn};
+use core::pin::Pin;
+use core::task::Waker;
+use core::task::{Context, Poll};
+use core::time::Duration;
 
 use crate::{clear_timeout, set_timeout};