From a0e0849a3b1710139d84be846a444c12297cfd2b Mon Sep 17 00:00:00 2001
From: Wim Looman <wim@nemo157.com>
Date: Sun, 21 Apr 2019 13:27:36 +0200
Subject: [PATCH] Add Pin::{into_inner,into_inner_unchecked}

---
 src/libcore/pin.rs | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/libcore/pin.rs b/src/libcore/pin.rs
index dbf3dcf03a3c0..e74ed9b7889cb 100644
--- a/src/libcore/pin.rs
+++ b/src/libcore/pin.rs
@@ -349,6 +349,18 @@ where
         // around pinning.
         unsafe { Pin::new_unchecked(pointer) }
     }
+
+    /// Unwraps this `Pin<P>` returning the underlying pointer.
+    ///
+    /// This requires that the data inside this `Pin` is [`Unpin`] so that we
+    /// can ignore the pinning invariants when unwrapping it.
+    ///
+    /// [`Unpin`]: ../../std/marker/trait.Unpin.html
+    #[unstable(feature = "pin_into_inner", issue = "60245")]
+    #[inline(always)]
+    pub fn into_inner(pin: Pin<P>) -> P {
+        pin.pointer
+    }
 }
 
 impl<P: Deref> Pin<P> {
@@ -434,6 +446,28 @@ impl<P: Deref> Pin<P> {
     pub fn as_ref(self: &Pin<P>) -> Pin<&P::Target> {
         unsafe { Pin::new_unchecked(&*self.pointer) }
     }
+
+    /// Unwraps this `Pin<P>` returning the underlying pointer.
+    ///
+    /// # Safety
+    ///
+    /// This function is unsafe. You must guarantee that you will continue to
+    /// treat the pointer `P` as pinned after you call this function, so that
+    /// the invariants on the `Pin` type can be upheld. If the code using the
+    /// resulting `P` does not continue to maintain the pinning invariants that
+    /// is a violation of the API contract and may lead to undefined behavior in
+    /// later (safe) operations.
+    ///
+    /// If the underlying data is [`Unpin`], [`Pin::into_inner`] should be used
+    /// instead.
+    ///
+    /// [`Unpin`]: ../../std/marker/trait.Unpin.html
+    /// [`Pin::into_inner`]: #method.into_inner
+    #[unstable(feature = "pin_into_inner", issue = "60245")]
+    #[inline(always)]
+    pub unsafe fn into_inner_unchecked(pin: Pin<P>) -> P {
+        pin.pointer
+    }
 }
 
 impl<P: DerefMut> Pin<P> {