1 files changed, 0 insertions, 98 deletions
diff --git a/src/libstd/future.rs b/src/libstd/future.rs
index 7b1beb1ecda..e2092cfefa3 100644
--- a/src/libstd/future.rs
+++ b/src/libstd/future.rs
@@ -1,103 +1,5 @@
 //! Asynchronous values.
 
-use core::cell::Cell;
-use core::marker::Unpin;
-use core::ops::{Drop, Generator, GeneratorState};
-use core::option::Option;
-use core::pin::Pin;
-use core::ptr::NonNull;
-use core::task::{Context, Poll};
-
 #[doc(inline)]
 #[stable(feature = "futures_api", since = "1.36.0")]
 pub use core::future::*;
-
-/// Wrap a generator in a future.
-///
-/// This function returns a `GenFuture` underneath, but hides it in `impl Trait` to give
-/// better error messages (`impl Future` rather than `GenFuture<[closure.....]>`).
-// This is `const` to avoid extra errors after we recover from `const async fn`
-#[doc(hidden)]
-#[unstable(feature = "gen_future", issue = "50547")]
-pub const fn from_generator<T: Generator<Yield = ()>>(x: T) -> impl Future<Output = T::Return> {
-    GenFuture(x)
-}
-
-/// A wrapper around generators used to implement `Future` for `async`/`await` code.
-#[doc(hidden)]
-#[unstable(feature = "gen_future", issue = "50547")]
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
-struct GenFuture<T: Generator<Yield = ()>>(T);
-
-// We rely on the fact that async/await futures are immovable in order to create
-// self-referential borrows in the underlying generator.
-impl<T: Generator<Yield = ()>> !Unpin for GenFuture<T> {}
-
-#[doc(hidden)]
-#[unstable(feature = "gen_future", issue = "50547")]
-impl<T: Generator<Yield = ()>> Future for GenFuture<T> {
-    type Output = T::Return;
-    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
-        // Safe because we're !Unpin + !Drop mapping to a ?Unpin value
-        let gen = unsafe { Pin::map_unchecked_mut(self, |s| &mut s.0) };
-        let _guard = unsafe { set_task_context(cx) };
-        match gen.resume(
-            #[cfg(not(bootstrap))]
-            (),
-        ) {
-            GeneratorState::Yielded(()) => Poll::Pending,
-            GeneratorState::Complete(x) => Poll::Ready(x),
-        }
-    }
-}
-
-thread_local! {
-    static TLS_CX: Cell<Option<NonNull<Context<'static>>>> = Cell::new(None);
-}
-
-struct SetOnDrop(Option<NonNull<Context<'static>>>);
-
-impl Drop for SetOnDrop {
-    fn drop(&mut self) {
-        TLS_CX.with(|tls_cx| {
-            tls_cx.set(self.0.take());
-        });
-    }
-}
-
-// Safety: the returned guard must drop before `cx` is dropped and before
-// any previous guard is dropped.
-unsafe fn set_task_context(cx: &mut Context<'_>) -> SetOnDrop {
-    // transmute the context's lifetime to 'static so we can store it.
-    let cx = core::mem::transmute::<&mut Context<'_>, &mut Context<'static>>(cx);
-    let old_cx = TLS_CX.with(|tls_cx| tls_cx.replace(Some(NonNull::from(cx))));
-    SetOnDrop(old_cx)
-}
-
-#[doc(hidden)]
-#[unstable(feature = "gen_future", issue = "50547")]
-/// Polls a future in the current thread-local task waker.
-pub fn poll_with_tls_context<F>(f: Pin<&mut F>) -> Poll<F::Output>
-where
-    F: Future,
-{
-    let cx_ptr = TLS_CX.with(|tls_cx| {
-        // Clear the entry so that nested `get_task_waker` calls
-        // will fail or set their own value.
-        tls_cx.replace(None)
-    });
-    let _reset = SetOnDrop(cx_ptr);
-
-    let mut cx_ptr = cx_ptr.expect(
-        "TLS Context not set. This is a rustc bug. \
-        Please file an issue on https://github.com/rust-lang/rust.",
-    );
-
-    // Safety: we've ensured exclusive access to the context by
-    // removing the pointer from TLS, only to be replaced once
-    // we're done with it.
-    //
-    // The pointer that was inserted came from an `&mut Context<'_>`,
-    // so it is safe to treat as mutable.
-    unsafe { F::poll(f, cx_ptr.as_mut()) }
-}