Format libcore with rustfmt

This commit applies rustfmt with default settings to files in
src/libcore *that are not involved in any currently open PR* to minimize
merge conflicts. The list of files involved in open PRs was determined
by querying GitHub's GraphQL API with this script:
https://gist.github.com/dtolnay/aa9c34993dc051a4f344d1b10e4487e8

With the list of files from the script in `outstanding_files`, the
relevant commands were:

    $ find src/libcore -name '*.rs' | xargs rustfmt --edition=2018
    $ rg libcore outstanding_files | xargs git checkout --

Repeating this process several months apart should get us coverage of
most of the rest of libcore.

3 files changed, 17 insertions, 30 deletions

diff --git a/src/libcore/task/mod.rs b/src/libcore/task/mod.rs
index ef090928392..27760749c1d 100644
--- a/src/libcore/task/mod.rs
+++ b/src/libcore/task/mod.rs
@@ -8,4 +8,4 @@ pub use self::poll::Poll;
 
 mod wake;
 #[stable(feature = "futures_api", since = "1.36.0")]
-pub use self::wake::{Context, Waker, RawWaker, RawWakerVTable};
+pub use self::wake::{Context, RawWaker, RawWakerVTable, Waker};
diff --git a/src/libcore/task/poll.rs b/src/libcore/task/poll.rs
index fec17c4d1a4..d567ae54577 100644
--- a/src/libcore/task/poll.rs
+++ b/src/libcore/task/poll.rs
@@ -11,10 +11,7 @@ use crate::result::Result;
 pub enum Poll<T> {
     /// Represents that a value is immediately ready.
     #[stable(feature = "futures_api", since = "1.36.0")]
-    Ready(
-        #[stable(feature = "futures_api", since = "1.36.0")]
-        T
-    ),
+    Ready(#[stable(feature = "futures_api", since = "1.36.0")] T),
 
     /// Represents that a value is not ready yet.
     ///
@@ -29,7 +26,8 @@ impl<T> Poll<T> {
     /// Changes the ready value of this `Poll` with the closure provided.
     #[stable(feature = "futures_api", since = "1.36.0")]
     pub fn map<U, F>(self, f: F) -> Poll<U>
-        where F: FnOnce(T) -> U
+    where
+        F: FnOnce(T) -> U,
     {
         match self {
             Poll::Ready(t) => Poll::Ready(f(t)),
@@ -59,7 +57,8 @@ impl<T, E> Poll<Result<T, E>> {
     /// Changes the success value of this `Poll` with the closure provided.
     #[stable(feature = "futures_api", since = "1.36.0")]
     pub fn map_ok<U, F>(self, f: F) -> Poll<Result<U, E>>
-        where F: FnOnce(T) -> U
+    where
+        F: FnOnce(T) -> U,
     {
         match self {
             Poll::Ready(Ok(t)) => Poll::Ready(Ok(f(t))),
@@ -71,7 +70,8 @@ impl<T, E> Poll<Result<T, E>> {
     /// Changes the error value of this `Poll` with the closure provided.
     #[stable(feature = "futures_api", since = "1.36.0")]
     pub fn map_err<U, F>(self, f: F) -> Poll<Result<T, U>>
-        where F: FnOnce(E) -> U
+    where
+        F: FnOnce(E) -> U,
     {
         match self {
             Poll::Ready(Ok(t)) => Poll::Ready(Ok(t)),
@@ -85,7 +85,8 @@ impl<T, E> Poll<Option<Result<T, E>>> {
     /// Changes the success value of this `Poll` with the closure provided.
     #[unstable(feature = "poll_map", issue = "63514")]
     pub fn map_ok<U, F>(self, f: F) -> Poll<Option<Result<U, E>>>
-        where F: FnOnce(T) -> U
+    where
+        F: FnOnce(T) -> U,
     {
         match self {
             Poll::Ready(Some(Ok(t))) => Poll::Ready(Some(Ok(f(t)))),
@@ -98,7 +99,8 @@ impl<T, E> Poll<Option<Result<T, E>>> {
     /// Changes the error value of this `Poll` with the closure provided.
     #[unstable(feature = "poll_map", issue = "63514")]
     pub fn map_err<U, F>(self, f: F) -> Poll<Option<Result<T, U>>>
-        where F: FnOnce(E) -> U
+    where
+        F: FnOnce(E) -> U,
     {
         match self {
             Poll::Ready(Some(Ok(t))) => Poll::Ready(Some(Ok(t))),
diff --git a/src/libcore/task/wake.rs b/src/libcore/task/wake.rs
index 6f841bd2adf..0759ff93ea8 100644
--- a/src/libcore/task/wake.rs
+++ b/src/libcore/task/wake.rs
@@ -40,10 +40,7 @@ impl RawWaker {
     #[rustc_promotable]
     #[stable(feature = "futures_api", since = "1.36.0")]
     pub const fn new(data: *const (), vtable: &'static RawWakerVTable) -> RawWaker {
-        RawWaker {
-            data,
-            vtable,
-        }
+        RawWaker { data, vtable }
     }
 }
 
@@ -160,12 +157,7 @@ impl RawWakerVTable {
         wake_by_ref: unsafe fn(*const ()),
         drop: unsafe fn(*const ()),
     ) -> Self {
-        Self {
-            clone,
-            wake,
-            wake_by_ref,
-            drop,
-        }
+        Self { clone, wake, wake_by_ref, drop }
     }
 }
 
@@ -188,10 +180,7 @@ impl<'a> Context<'a> {
     #[stable(feature = "futures_api", since = "1.36.0")]
     #[inline]
     pub fn from_waker(waker: &'a Waker) -> Self {
-        Context {
-            waker,
-            _marker: PhantomData,
-        }
+        Context { waker, _marker: PhantomData }
     }
 
     /// Returns a reference to the `Waker` for the current task.
@@ -205,9 +194,7 @@ impl<'a> Context<'a> {
 #[stable(feature = "futures_api", since = "1.36.0")]
 impl fmt::Debug for Context<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Context")
-            .field("waker", &self.waker)
-            .finish()
+        f.debug_struct("Context").field("waker", &self.waker).finish()
     }
 }
 
@@ -291,9 +278,7 @@ impl Waker {
     #[inline]
     #[stable(feature = "futures_api", since = "1.36.0")]
     pub unsafe fn from_raw(waker: RawWaker) -> Waker {
-        Waker {
-            waker,
-        }
+        Waker { waker }
     }
 }