f impl future even in no-std, cause why not

Author: TheBlueMatt

lightning/src/util/wakers.rs

@@ -21,12 +21,9 @@ use sync::{Condvar, Mutex};
 #[cfg(any(test, feature = "std"))]
 use std::time::Instant;
 
-#[cfg(feature = "std")]
-use std::future::Future as StdFuture;
-#[cfg(feature = "std")]
-use std::task::{Context, Poll};
-#[cfg(feature = "std")]
-use std::pin::Pin;
+use core::future::Future as StdFuture;
+use core::task::{Context, Poll};
+use core::pin::Pin;
 
 /// Used to signal to one of many waiters that the condition they're waiting on has happened.
 pub(crate) struct Notifier {
@@ -184,7 +181,6 @@ mod std_future {
 	}
 }
 
-#[cfg(feature = "std")]
 /// (C-not exported) as Rust Futures aren't usable in language bindings.
 impl<'a> StdFuture for Future {
 	type Output = ();
@@ -207,7 +203,6 @@ mod tests {
 	use core::sync::atomic::{AtomicBool, Ordering};
 	use core::future::Future as FutureTrait;
 	use core::task::{Context, Poll, RawWaker, RawWakerVTable, Waker};
-	use core::pin::Pin;
 
 	#[cfg(feature = "std")]
 	#[test]