Revert #65244 for performance reasons

src/libcore/future/future.rs

@@ -99,21 +99,6 @@ pub trait Future {
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>;
 }
 
-/// Conversion into a `Future`.
-#[unstable(feature = "into_future", issue = "67644")]
-pub trait IntoFuture {
-    /// The output that the future will produce on completion.
-    #[unstable(feature = "into_future", issue = "67644")]
-    type Output;
-    /// Which kind of future are we turning this into?
-    #[unstable(feature = "into_future", issue = "67644")]
-    type Future: Future<Output = Self::Output>;
-
-    /// Creates a future from a value.
-    #[unstable(feature = "into_future", issue = "67644")]
-    fn into_future(self) -> Self::Future;
-}
-
 #[stable(feature = "futures_api", since = "1.36.0")]
 impl<F: ?Sized + Future + Unpin> Future for &mut F {
     type Output = F::Output;
@@ -134,13 +119,3 @@ where
         Pin::get_mut(self).as_mut().poll(cx)
     }
 }
-
-#[unstable(feature = "into_future", issue = "67644")]
-impl<F: Future> IntoFuture for F {
-    type Output = F::Output;
-    type Future = F;
-
-    fn into_future(self) -> Self::Future {
-        self
-    }
-}

src/libcore/future/mod.rs

@@ -5,6 +5,3 @@
 mod future;
 #[stable(feature = "futures_api", since = "1.36.0")]
 pub use self::future::Future;
-
-#[unstable(feature = "into_future", issue = "67644")]
-pub use self::future::IntoFuture;

src/librustc_ast_lowering/expr.rs

@@ -517,7 +517,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
 
     /// Desugar `<expr>.await` into:
     /// ```rust
-    /// match ::std::future::IntoFuture::into_future(<expr>) {
+    /// match <expr> {
     ///     mut pinned => loop {
     ///         match ::std::future::poll_with_tls_context(unsafe {
     ///             <::std::pin::Pin>::new_unchecked(&mut pinned)
@@ -641,27 +641,11 @@ impl<'hir> LoweringContext<'_, 'hir> {
         // mut pinned => loop { ... }
         let pinned_arm = self.arm(pinned_pat, loop_expr);
 
-        // `match ::std::future::IntoFuture::into_future(<expr>) { ... }`
-        let into_future_span = self.mark_span_with_reason(
-            DesugaringKind::Await,
-            await_span,
-            self.allow_into_future.clone(),
-        );
-        let expr = self.lower_expr_mut(expr);
-        let into_future_expr = self.expr_call_std_path(
-            into_future_span,
-            &[sym::future, sym::IntoFuture, sym::into_future],
-            arena_vec![self; expr],
-        );
-
-        // match <into_future_expr> {
+        // match <expr> {
         //     mut pinned => loop { .. }
         // }
-        hir::ExprKind::Match(
-            into_future_expr,
-            arena_vec![self; pinned_arm],
-            hir::MatchSource::AwaitDesugar,
-        )
+        let expr = self.lower_expr(expr);
+        hir::ExprKind::Match(expr, arena_vec![self; pinned_arm], hir::MatchSource::AwaitDesugar)
     }
 
     fn lower_expr_closure(

src/librustc_ast_lowering/lib.rs

@@ -167,7 +167,6 @@ struct LoweringContext<'a, 'hir: 'a> {
 
     allow_try_trait: Option<Lrc<[Symbol]>>,
     allow_gen_future: Option<Lrc<[Symbol]>>,
-    allow_into_future: Option<Lrc<[Symbol]>>,
 }
 
 pub trait Resolver {
@@ -300,7 +299,6 @@ pub fn lower_crate<'a, 'hir>(
         in_scope_lifetimes: Vec::new(),
         allow_try_trait: Some([sym::try_trait][..].into()),
         allow_gen_future: Some([sym::gen_future][..].into()),
-        allow_into_future: Some([sym::into_future][..].into()),
     }
     .lower_crate(krate)
 }

src/librustc_span/symbol.rs

@@ -379,8 +379,6 @@ symbols! {
         infer_static_outlives_requirements,
         inline,
         intel,
-        into_future,
-        IntoFuture,
         into_iter,
         IntoIterator,
         into_result,

src/libstd/future.rs

@@ -10,11 +10,7 @@ use core::task::{Context, Poll};
 
 #[doc(inline)]
 #[stable(feature = "futures_api", since = "1.36.0")]
-pub use core::future::Future;
-
-#[doc(inline)]
-#[unstable(feature = "into_future", issue = "67644")]
-pub use core::future::IntoFuture;
+pub use core::future::*;
 
 /// Wrap a generator in a future.
 ///

src/libstd/lib.rs

@@ -269,7 +269,6 @@
 #![feature(hashmap_internals)]
 #![feature(int_error_internals)]
 #![feature(int_error_matching)]
-#![feature(into_future)]
 #![feature(integer_atomics)]
 #![feature(lang_items)]
 #![feature(libc)]

src/test/ui/async-await/async-fn-size-moved-locals.rs

@@ -112,7 +112,7 @@ async fn mixed_sizes() {
 fn main() {
     assert_eq!(1028, std::mem::size_of_val(&single()));
     assert_eq!(1032, std::mem::size_of_val(&single_with_noop()));
-    assert_eq!(3080, std::mem::size_of_val(&joined()));
-    assert_eq!(3080, std::mem::size_of_val(&joined_with_noop()));
-    assert_eq!(6164, std::mem::size_of_val(&mixed_sizes()));
+    assert_eq!(3084, std::mem::size_of_val(&joined()));
+    assert_eq!(3084, std::mem::size_of_val(&joined_with_noop()));
+    assert_eq!(7188, std::mem::size_of_val(&mixed_sizes()));
 }

src/test/ui/async-await/issues/issue-62009-1.stderr

@@ -32,8 +32,11 @@ error[E0277]: the trait bound `[closure@$DIR/issue-62009-1.rs:16:5: 16:15]: std:
    |
 LL |     (|_| 2333).await;
    |     ^^^^^^^^^^^^^^^^ the trait `std::future::Future` is not implemented for `[closure@$DIR/issue-62009-1.rs:16:5: 16:15]`
+   | 
+  ::: $SRC_DIR/libstd/future.rs:LL:COL
    |
-   = note: required by `std::future::IntoFuture::into_future`
+LL |     F: Future,
+   |        ------ required by this bound in `std::future::poll_with_tls_context`
 
 error: aborting due to 4 previous errors