Snap for 8730993 from 3619c28f407eeb71d739672b653d677dd4bebf17 to mainline-tzdata3-releaseaml_tz3_314012070aml_tz3_314012050aml_tz3_314012010aml_tz3_313110000aml_tz3_312511020aml_tz3_312511010aml_tz3_312410020aml_tz3_312410010android12-mainline-tzdata3-releaseaml_tz3_314012010

Change-Id: I4927e2bcd249060fec4051d619623adc66877165

15 files changed, 284 insertions, 223 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index 1f750b1..f3ad3ab 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,6 +1,5 @@
 {
   "git": {
-    "sha1": "fc1e3250219170e31cddb8857a276cba7dd08d44"
-  },
-  "path_in_vcs": "futures-task"
-}
\ No newline at end of file
+    "sha1": "c91f8691672c7401b1923ab00bf138975c99391a"
+  }
+}
diff --git a/Android.bp b/Android.bp
index eebc67c..91514fd 100644
--- a/Android.bp
+++ b/Android.bp
@@ -37,18 +37,12 @@ license {
     ],
 }
 
-rust_test {
-    name: "futures-task_test_src_lib",
-    host_supported: true,
+rust_defaults {
+    name: "futures-task_defaults",
     crate_name: "futures_task",
-    cargo_env_compat: true,
-    cargo_pkg_version: "0.3.21",
     srcs: ["src/lib.rs"],
     test_suites: ["general-tests"],
     auto_gen_config: true,
-    test_options: {
-        unit_test: true,
-    },
     edition: "2018",
     features: [
         "alloc",
@@ -57,12 +51,23 @@ rust_test {
     ],
 }
 
+rust_test_host {
+    name: "futures-task_host_test_src_lib",
+    defaults: ["futures-task_defaults"],
+    test_options: {
+        unit_test: true,
+    },
+}
+
+rust_test {
+    name: "futures-task_device_test_src_lib",
+    defaults: ["futures-task_defaults"],
+}
+
 rust_library {
     name: "libfutures_task",
     host_supported: true,
     crate_name: "futures_task",
-    cargo_env_compat: true,
-    cargo_pkg_version: "0.3.21",
     srcs: ["src/lib.rs"],
     edition: "2018",
     features: [
@@ -72,7 +77,6 @@ rust_library {
     ],
     apex_available: [
         "//apex_available:platform",
-        "com.android.bluetooth",
         "com.android.resolv",
         "com.android.virt",
     ],
diff --git a/Cargo.toml b/Cargo.toml
index c65433f..7327f40 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,24 +3,23 @@
 # When uploading crates to the registry Cargo will automatically
 # "normalize" Cargo.toml files for maximal compatibility
 # with all versions of Cargo and also rewrite `path` dependencies
-# to registry (e.g., crates.io) dependencies.
+# to registry (e.g., crates.io) dependencies
 #
-# If you are reading this file be aware that the original Cargo.toml
-# will likely look very different (and much more reasonable).
-# See Cargo.toml.orig for the original contents.
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
 
 [package]
 edition = "2018"
-rust-version = "1.45"
 name = "futures-task"
-version = "0.3.21"
-description = """
-Tools for working with tasks.
-"""
+version = "0.3.13"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+description = "Tools for working with tasks.\n"
 homepage = "https://rust-lang.github.io/futures-rs"
+documentation = "https://docs.rs/futures-task/0.3"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/futures-rs"
-
 [package.metadata.docs.rs]
 all-features = true
 
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 77fec6f..764a692 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,11 +1,12 @@
 [package]
 name = "futures-task"
-version = "0.3.21"
 edition = "2018"
-rust-version = "1.45"
+version = "0.3.13"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/futures-rs"
 homepage = "https://rust-lang.github.io/futures-rs"
+documentation = "https://docs.rs/futures-task/0.3"
 description = """
 Tools for working with tasks.
 """
@@ -15,8 +16,9 @@ default = ["std"]
 std = ["alloc"]
 alloc = []
 
-# These features are no longer used.
-# TODO: remove in the next major version.
+# Unstable features
+# These features are outside of the normal semver guarantees and require the
+# `unstable` feature as an explicit opt-in to unstable API.
 unstable = []
 cfg-target-has-atomic = []
 
diff --git a/METADATA b/METADATA
index 87e267d..38caccf 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@ third_party {
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/futures-task/futures-task-0.3.21.crate"
+    value: "https://static.crates.io/crates/futures-task/futures-task-0.3.13.crate"
   }
-  version: "0.3.21"
+  version: "0.3.13"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2022
-    month: 3
+    year: 2021
+    month: 4
     day: 1
   }
 }
diff --git a/README.md b/README.md
deleted file mode 100644
index 8ceeba9..0000000
--- a/README.md
+++ /dev/null
@@ -1,23 +0,0 @@
-# futures-task
-
-Tools for working with tasks.
-
-## Usage
-
-Add this to your `Cargo.toml`:
-
-```toml
-[dependencies]
-futures-task = "0.3"
-```
-
-The current `futures-task` requires Rust 1.45 or later.
-
-## License
-
-Licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or
-[MIT license](LICENSE-MIT) at your option.
-
-Unless you explicitly state otherwise, any contribution intentionally submitted
-for inclusion in the work by you, as defined in the Apache-2.0 license, shall
-be dual licensed as above, without any additional terms or conditions.
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 64f7c12..723e5ac 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,51 +1,161 @@
 // Generated by update_crate_tests.py for tests that depend on this crate.
 {
-  "imports": [
+  "presubmit": [
     {
-      "path": "external/rust/crates/anyhow"
+      "name": "ZipFuseTest"
     },
     {
-      "path": "external/rust/crates/futures-util"
+      "name": "anyhow_device_test_src_lib"
     },
     {
-      "path": "external/rust/crates/tokio"
+      "name": "anyhow_device_test_tests_test_autotrait"
     },
     {
-      "path": "external/rust/crates/tokio-test"
-    }
-  ],
-  "presubmit": [
+      "name": "anyhow_device_test_tests_test_boxed"
+    },
     {
-      "name": "ZipFuseTest"
+      "name": "anyhow_device_test_tests_test_chain"
     },
     {
-      "name": "authfs_device_test_src_lib"
+      "name": "anyhow_device_test_tests_test_context"
     },
     {
-      "name": "doh_unit_test"
+      "name": "anyhow_device_test_tests_test_convert"
     },
     {
-      "name": "futures-task_test_src_lib"
+      "name": "anyhow_device_test_tests_test_downcast"
     },
     {
-      "name": "virtualizationservice_device_test"
-    }
-  ],
-  "presubmit-rust": [
+      "name": "anyhow_device_test_tests_test_ffi"
+    },
     {
-      "name": "ZipFuseTest"
+      "name": "anyhow_device_test_tests_test_fmt"
+    },
+    {
+      "name": "anyhow_device_test_tests_test_macros"
+    },
+    {
+      "name": "anyhow_device_test_tests_test_repr"
+    },
+    {
+      "name": "anyhow_device_test_tests_test_source"
     },
     {
       "name": "authfs_device_test_src_lib"
     },
     {
-      "name": "doh_unit_test"
+      "name": "futures-task_device_test_src_lib"
+    },
+    {
+      "name": "futures-util_device_test_src_lib"
+    },
+    {
+      "name": "tokio-test_device_test_src_lib"
+    },
+    {
+      "name": "tokio-test_device_test_tests_block_on"
+    },
+    {
+      "name": "tokio-test_device_test_tests_io"
+    },
+    {
+      "name": "tokio-test_device_test_tests_macros"
+    },
+    {
+      "name": "tokio_device_test_tests_buffered"
+    },
+    {
+      "name": "tokio_device_test_tests_io_async_read"
+    },
+    {
+      "name": "tokio_device_test_tests_io_copy_bidirectional"
+    },
+    {
+      "name": "tokio_device_test_tests_io_lines"
+    },
+    {
+      "name": "tokio_device_test_tests_io_mem_stream"
+    },
+    {
+      "name": "tokio_device_test_tests_io_read"
+    },
+    {
+      "name": "tokio_device_test_tests_io_read_buf"
+    },
+    {
+      "name": "tokio_device_test_tests_io_read_to_end"
+    },
+    {
+      "name": "tokio_device_test_tests_io_take"
+    },
+    {
+      "name": "tokio_device_test_tests_io_write"
+    },
+    {
+      "name": "tokio_device_test_tests_io_write_all"
+    },
+    {
+      "name": "tokio_device_test_tests_io_write_buf"
+    },
+    {
+      "name": "tokio_device_test_tests_io_write_int"
+    },
+    {
+      "name": "tokio_device_test_tests_macros_join"
+    },
+    {
+      "name": "tokio_device_test_tests_no_rt"
+    },
+    {
+      "name": "tokio_device_test_tests_rt_basic"
+    },
+    {
+      "name": "tokio_device_test_tests_rt_threaded"
+    },
+    {
+      "name": "tokio_device_test_tests_sync_barrier"
+    },
+    {
+      "name": "tokio_device_test_tests_sync_broadcast"
+    },
+    {
+      "name": "tokio_device_test_tests_sync_errors"
+    },
+    {
+      "name": "tokio_device_test_tests_sync_mpsc"
+    },
+    {
+      "name": "tokio_device_test_tests_sync_mutex_owned"
+    },
+    {
+      "name": "tokio_device_test_tests_sync_rwlock"
+    },
+    {
+      "name": "tokio_device_test_tests_sync_watch"
+    },
+    {
+      "name": "tokio_device_test_tests_task_local"
+    },
+    {
+      "name": "tokio_device_test_tests_task_local_set"
+    },
+    {
+      "name": "tokio_device_test_tests_tcp_accept"
+    },
+    {
+      "name": "tokio_device_test_tests_tcp_echo"
+    },
+    {
+      "name": "tokio_device_test_tests_tcp_into_std"
+    },
+    {
+      "name": "tokio_device_test_tests_tcp_shutdown"
     },
     {
-      "name": "futures-task_test_src_lib"
+      "name": "tokio_device_test_tests_time_rt"
     },
     {
-      "name": "virtualizationservice_device_test"
+      "name": "tokio_device_test_tests_uds_split"
     }
   ]
 }
diff --git a/build.rs b/build.rs
deleted file mode 100644
index 05e0496..0000000
--- a/build.rs
+++ /dev/null
@@ -1,41 +0,0 @@
-// The rustc-cfg listed below are considered public API, but it is *unstable*
-// and outside of the normal semver guarantees:
-//
-// - `futures_no_atomic_cas`
-//      Assume the target does *not* support atomic CAS operations.
-//      This is usually detected automatically by the build script, but you may
-//      need to enable it manually when building for custom targets or using
-//      non-cargo build systems that don't run the build script.
-//
-// With the exceptions mentioned above, the rustc-cfg emitted by the build
-// script are *not* public API.
-
-#![warn(rust_2018_idioms, single_use_lifetimes)]
-
-use std::env;
-
-include!("no_atomic_cas.rs");
-
-fn main() {
-    let target = match env::var("TARGET") {
-        Ok(target) => target,
-        Err(e) => {
-            println!(
-                "cargo:warning={}: unable to get TARGET environment variable: {}",
-                env!("CARGO_PKG_NAME"),
-                e
-            );
-            return;
-        }
-    };
-
-    // Note that this is `no_*`, not `has_*`. This allows treating
-    // `cfg(target_has_atomic = "ptr")` as true when the build script doesn't
-    // run. This is needed for compatibility with non-cargo build systems that
-    // don't run the build script.
-    if NO_ATOMIC_CAS.contains(&&*target) {
-        println!("cargo:rustc-cfg=futures_no_atomic_cas");
-    }
-
-    println!("cargo:rerun-if-changed=no_atomic_cas.rs");
-}
diff --git a/cargo2android.json b/cargo2android.json
index 5b266a6..44e747c 100644
--- a/cargo2android.json
+++ b/cargo2android.json
@@ -1,13 +1,12 @@
 {
   "apex-available": [
     "//apex_available:platform",
-    "com.android.bluetooth",
     "com.android.resolv",
     "com.android.virt"
   ],
+  "min_sdk_version": "29",
   "dependencies": true,
   "device": true,
-  "min-sdk-version": "29",
   "run": true,
   "tests": true
-}
+}
\ No newline at end of file
diff --git a/no_atomic_cas.rs b/no_atomic_cas.rs
deleted file mode 100644
index 9b05d4b..0000000
--- a/no_atomic_cas.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-// This file is @generated by no_atomic_cas.sh.
-// It is not intended for manual editing.
-
-const NO_ATOMIC_CAS: &[&str] = &[
-    "avr-unknown-gnu-atmega328",
-    "bpfeb-unknown-none",
-    "bpfel-unknown-none",
-    "msp430-none-elf",
-    "riscv32i-unknown-none-elf",
-    "riscv32imc-unknown-none-elf",
-    "thumbv4t-none-eabi",
-    "thumbv6m-none-eabi",
-];
diff --git a/src/future_obj.rs b/src/future_obj.rs
index f67494a..373be24 100644
--- a/src/future_obj.rs
+++ b/src/future_obj.rs
@@ -1,8 +1,8 @@
 use core::{
+    mem,
     fmt,
     future::Future,
     marker::PhantomData,
-    mem,
     pin::Pin,
     task::{Context, Poll},
 };
@@ -26,16 +26,16 @@ impl<T> Unpin for LocalFutureObj<'_, T> {}
 
 #[allow(single_use_lifetimes)]
 #[allow(clippy::transmute_ptr_to_ptr)]
-unsafe fn remove_future_lifetime<'a, T>(
-    ptr: *mut (dyn Future<Output = T> + 'a),
-) -> *mut (dyn Future<Output = T> + 'static) {
+unsafe fn remove_future_lifetime<'a, T>(ptr: *mut (dyn Future<Output = T> + 'a))
+    -> *mut (dyn Future<Output = T> + 'static)
+{
     mem::transmute(ptr)
 }
 
 #[allow(single_use_lifetimes)]
-unsafe fn remove_drop_lifetime<'a, T>(
-    ptr: unsafe fn(*mut (dyn Future<Output = T> + 'a)),
-) -> unsafe fn(*mut (dyn Future<Output = T> + 'static)) {
+unsafe fn remove_drop_lifetime<'a, T>(ptr: unsafe fn (*mut (dyn Future<Output = T> + 'a)))
+    -> unsafe fn(*mut (dyn Future<Output = T> + 'static))
+{
     mem::transmute(ptr)
 }
 
@@ -65,7 +65,8 @@ impl<'a, T> LocalFutureObj<'a, T> {
 
 impl<T> fmt::Debug for LocalFutureObj<'_, T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("LocalFutureObj").finish()
+        f.debug_struct("LocalFutureObj")
+            .finish()
     }
 }
 
@@ -81,13 +82,17 @@ impl<T> Future for LocalFutureObj<'_, T> {
 
     #[inline]
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
-        unsafe { Pin::new_unchecked(&mut *self.future).poll(cx) }
+        unsafe {
+            Pin::new_unchecked(&mut *self.future).poll(cx)
+        }
     }
 }
 
 impl<T> Drop for LocalFutureObj<'_, T> {
     fn drop(&mut self) {
-        unsafe { (self.drop_fn)(self.future) }
+        unsafe {
+            (self.drop_fn)(self.future)
+        }
     }
 }
 
@@ -115,7 +120,8 @@ impl<'a, T> FutureObj<'a, T> {
 
 impl<T> fmt::Debug for FutureObj<'_, T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("FutureObj").finish()
+        f.debug_struct("FutureObj")
+            .finish()
     }
 }
 
@@ -124,7 +130,7 @@ impl<T> Future for FutureObj<'_, T> {
 
     #[inline]
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
-        Pin::new(&mut self.0).poll(cx)
+        Pin::new( &mut self.0 ).poll(cx)
     }
 }
 
@@ -174,7 +180,7 @@ pub unsafe trait UnsafeFutureObj<'a, T>: 'a {
 
 unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for &'a mut F
 where
-    F: Future<Output = T> + Unpin + 'a,
+    F: Future<Output = T> + Unpin + 'a
 {
     fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
         self as *mut dyn Future<Output = T>
@@ -183,7 +189,8 @@ where
     unsafe fn drop(_ptr: *mut (dyn Future<Output = T> + 'a)) {}
 }
 
-unsafe impl<'a, T> UnsafeFutureObj<'a, T> for &'a mut (dyn Future<Output = T> + Unpin + 'a) {
+unsafe impl<'a, T> UnsafeFutureObj<'a, T> for &'a mut (dyn Future<Output = T> + Unpin + 'a)
+{
     fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
         self as *mut dyn Future<Output = T>
     }
@@ -193,7 +200,7 @@ unsafe impl<'a, T> UnsafeFutureObj<'a, T> for &'a mut (dyn Future<Output = T> +
 
 unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for Pin<&'a mut F>
 where
-    F: Future<Output = T> + 'a,
+    F: Future<Output = T> + 'a
 {
     fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
         unsafe { self.get_unchecked_mut() as *mut dyn Future<Output = T> }
@@ -202,7 +209,8 @@ where
     unsafe fn drop(_ptr: *mut (dyn Future<Output = T> + 'a)) {}
 }
 
-unsafe impl<'a, T> UnsafeFutureObj<'a, T> for Pin<&'a mut (dyn Future<Output = T> + 'a)> {
+unsafe impl<'a, T> UnsafeFutureObj<'a, T> for Pin<&'a mut (dyn Future<Output = T> + 'a)>
+{
     fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
         unsafe { self.get_unchecked_mut() as *mut dyn Future<Output = T> }
     }
@@ -216,15 +224,14 @@ mod if_alloc {
     use alloc::boxed::Box;
 
     unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for Box<F>
-    where
-        F: Future<Output = T> + 'a,
+        where F: Future<Output = T> + 'a
     {
         fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
             Box::into_raw(self)
         }
 
         unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
-            drop(Box::from_raw(ptr.cast::<F>()))
+            drop(Box::from_raw(ptr as *mut F))
         }
     }
 
@@ -250,11 +257,12 @@ mod if_alloc {
 
     unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for Pin<Box<F>>
     where
-        F: Future<Output = T> + 'a,
+        F: Future<Output = T> + 'a
     {
-        fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
-            let mut this = mem::ManuallyDrop::new(self);
-            unsafe { this.as_mut().get_unchecked_mut() as *mut _ }
+        fn into_raw(mut self) -> *mut (dyn Future<Output = T> + 'a) {
+            let ptr = unsafe { self.as_mut().get_unchecked_mut() as *mut _ };
+            mem::forget(self);
+            ptr
         }
 
         unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
@@ -263,9 +271,10 @@ mod if_alloc {
     }
 
     unsafe impl<'a, T: 'a> UnsafeFutureObj<'a, T> for Pin<Box<dyn Future<Output = T> + 'a>> {
-        fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
-            let mut this = mem::ManuallyDrop::new(self);
-            unsafe { this.as_mut().get_unchecked_mut() as *mut _ }
+        fn into_raw(mut self) -> *mut (dyn Future<Output = T> + 'a) {
+            let ptr = unsafe { self.as_mut().get_unchecked_mut() as *mut _ };
+            mem::forget(self);
+            ptr
         }
 
         unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
@@ -274,9 +283,10 @@ mod if_alloc {
     }
 
     unsafe impl<'a, T: 'a> UnsafeFutureObj<'a, T> for Pin<Box<dyn Future<Output = T> + Send + 'a>> {
-        fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
-            let mut this = mem::ManuallyDrop::new(self);
-            unsafe { this.as_mut().get_unchecked_mut() as *mut _ }
+        fn into_raw(mut self) -> *mut (dyn Future<Output = T> + 'a) {
+            let ptr = unsafe { self.as_mut().get_unchecked_mut() as *mut _ };
+            mem::forget(self);
+            ptr
         }
 
         unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
diff --git a/src/lib.rs b/src/lib.rs
index c724607..5505e3a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,43 +1,47 @@
 //! Tools for working with tasks.
 
+#![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))]
+
 #![cfg_attr(not(feature = "std"), no_std)]
-#![warn(missing_debug_implementations, missing_docs, rust_2018_idioms, unreachable_pub)]
+
+#![warn(missing_docs, missing_debug_implementations, rust_2018_idioms, unreachable_pub)]
 // It cannot be included in the published code because this lints have false positives in the minimum required version.
 #![cfg_attr(test, warn(single_use_lifetimes))]
-#![doc(test(
-    no_crate_inject,
-    attr(
-        deny(warnings, rust_2018_idioms, single_use_lifetimes),
-        allow(dead_code, unused_assignments, unused_variables)
-    )
-))]
+#![warn(clippy::all)]
+#![doc(test(attr(deny(warnings), allow(dead_code, unused_assignments, unused_variables))))]
+
+#[cfg(all(feature = "cfg-target-has-atomic", not(feature = "unstable")))]
+compile_error!("The `cfg-target-has-atomic` feature requires the `unstable` feature as an explicit opt-in to unstable features");
 
 #[cfg(feature = "alloc")]
 extern crate alloc;
 
+macro_rules! cfg_target_has_atomic {
+    ($($item:item)*) => {$(
+        #[cfg_attr(feature = "cfg-target-has-atomic", cfg(target_has_atomic = "ptr"))]
+        $item
+    )*};
+}
+
 mod spawn;
-pub use crate::spawn::{LocalSpawn, Spawn, SpawnError};
+pub use crate::spawn::{Spawn, SpawnError, LocalSpawn};
 
-#[cfg(not(futures_no_atomic_cas))]
-#[cfg(feature = "alloc")]
-mod arc_wake;
-#[cfg(not(futures_no_atomic_cas))]
-#[cfg(feature = "alloc")]
-pub use crate::arc_wake::ArcWake;
+cfg_target_has_atomic! {
+    #[cfg(feature = "alloc")]
+    mod arc_wake;
+    #[cfg(feature = "alloc")]
+    pub use crate::arc_wake::ArcWake;
 
-#[cfg(not(futures_no_atomic_cas))]
-#[cfg(feature = "alloc")]
-mod waker;
-#[cfg(not(futures_no_atomic_cas))]
-#[cfg(feature = "alloc")]
-pub use crate::waker::waker;
+    #[cfg(feature = "alloc")]
+    mod waker;
+    #[cfg(feature = "alloc")]
+    pub use crate::waker::waker;
 
-#[cfg(not(futures_no_atomic_cas))]
-#[cfg(feature = "alloc")]
-mod waker_ref;
-#[cfg(not(futures_no_atomic_cas))]
-#[cfg(feature = "alloc")]
-pub use crate::waker_ref::{waker_ref, WakerRef};
+    #[cfg(feature = "alloc")]
+    mod waker_ref;
+    #[cfg(feature = "alloc")]
+    pub use crate::waker_ref::{waker_ref, WakerRef};
+}
 
 mod future_obj;
 pub use crate::future_obj::{FutureObj, LocalFutureObj, UnsafeFutureObj};
@@ -47,4 +51,4 @@ pub use crate::noop_waker::noop_waker;
 pub use crate::noop_waker::noop_waker_ref;
 
 #[doc(no_inline)]
-pub use core::task::{Context, Poll, RawWaker, RawWakerVTable, Waker};
+pub use core::task::{Context, Poll, Waker, RawWaker, RawWakerVTable};
diff --git a/src/spawn.rs b/src/spawn.rs
index f4e6339..a515dd4 100644
--- a/src/spawn.rs
+++ b/src/spawn.rs
@@ -126,7 +126,7 @@ impl<Sp: ?Sized + LocalSpawn> LocalSpawn for &mut Sp {
 #[cfg(feature = "alloc")]
 mod if_alloc {
     use super::*;
-    use alloc::{boxed::Box, rc::Rc};
+    use alloc::{ boxed::Box, rc::Rc };
 
     impl<Sp: ?Sized + Spawn> Spawn for Box<Sp> {
         fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError> {
@@ -168,25 +168,27 @@ mod if_alloc {
         }
     }
 
-    #[cfg(not(futures_no_atomic_cas))]
-    impl<Sp: ?Sized + Spawn> Spawn for alloc::sync::Arc<Sp> {
-        fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError> {
-            (**self).spawn_obj(future)
-        }
+    cfg_target_has_atomic! {
+        use alloc::{ sync::Arc };
 
-        fn status(&self) -> Result<(), SpawnError> {
-            (**self).status()
-        }
-    }
+        impl<Sp: ?Sized + Spawn> Spawn for Arc<Sp> {
+            fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError> {
+                (**self).spawn_obj(future)
+            }
 
-    #[cfg(not(futures_no_atomic_cas))]
-    impl<Sp: ?Sized + LocalSpawn> LocalSpawn for alloc::sync::Arc<Sp> {
-        fn spawn_local_obj(&self, future: LocalFutureObj<'static, ()>) -> Result<(), SpawnError> {
-            (**self).spawn_local_obj(future)
+            fn status(&self) -> Result<(), SpawnError> {
+                (**self).status()
+            }
         }
 
-        fn status_local(&self) -> Result<(), SpawnError> {
-            (**self).status_local()
+        impl<Sp: ?Sized + LocalSpawn> LocalSpawn for Arc<Sp> {
+            fn spawn_local_obj(&self, future: LocalFutureObj<'static, ()>) -> Result<(), SpawnError> {
+                (**self).spawn_local_obj(future)
+            }
+
+            fn status_local(&self) -> Result<(), SpawnError> {
+                (**self).status_local()
+            }
         }
     }
 }
diff --git a/src/waker.rs b/src/waker.rs
index 7911256..265a445 100644
--- a/src/waker.rs
+++ b/src/waker.rs
@@ -1,7 +1,7 @@
 use super::arc_wake::ArcWake;
-use alloc::sync::Arc;
 use core::mem;
-use core::task::{RawWaker, RawWakerVTable, Waker};
+use core::task::{Waker, RawWaker, RawWakerVTable};
+use alloc::sync::Arc;
 
 pub(super) fn waker_vtable<W: ArcWake>() -> &'static RawWakerVTable {
     &RawWakerVTable::new(
@@ -20,9 +20,11 @@ pub fn waker<W>(wake: Arc<W>) -> Waker
 where
     W: ArcWake + 'static,
 {
-    let ptr = Arc::into_raw(wake).cast::<()>();
+    let ptr = Arc::into_raw(wake) as *const ();
 
-    unsafe { Waker::from_raw(RawWaker::new(ptr, waker_vtable::<W>())) }
+    unsafe {
+        Waker::from_raw(RawWaker::new(ptr, waker_vtable::<W>()))
+    }
 }
 
 // FIXME: panics on Arc::clone / refcount changes could wreak havoc on the
@@ -31,7 +33,7 @@ where
 #[allow(clippy::redundant_clone)] // The clone here isn't actually redundant.
 unsafe fn increase_refcount<T: ArcWake>(data: *const ()) {
     // Retain Arc, but don't touch refcount by wrapping in ManuallyDrop
-    let arc = mem::ManuallyDrop::new(Arc::<T>::from_raw(data.cast::<T>()));
+    let arc = mem::ManuallyDrop::new(Arc::<T>::from_raw(data as *const T));
     // Now increase refcount, but don't drop new refcount either
     let _arc_clone: mem::ManuallyDrop<_> = arc.clone();
 }
@@ -43,17 +45,17 @@ unsafe fn clone_arc_raw<T: ArcWake>(data: *const ()) -> RawWaker {
 }
 
 unsafe fn wake_arc_raw<T: ArcWake>(data: *const ()) {
-    let arc: Arc<T> = Arc::from_raw(data.cast::<T>());
+    let arc: Arc<T> = Arc::from_raw(data as *const T);
     ArcWake::wake(arc);
 }
 
 // used by `waker_ref`
 unsafe fn wake_by_ref_arc_raw<T: ArcWake>(data: *const ()) {
     // Retain Arc, but don't touch refcount by wrapping in ManuallyDrop
-    let arc = mem::ManuallyDrop::new(Arc::<T>::from_raw(data.cast::<T>()));
+    let arc = mem::ManuallyDrop::new(Arc::<T>::from_raw(data as *const T));
     ArcWake::wake_by_ref(&arc);
 }
 
 unsafe fn drop_arc_raw<T: ArcWake>(data: *const ()) {
-    drop(Arc::<T>::from_raw(data.cast::<T>()))
+    drop(Arc::<T>::from_raw(data as *const T))
 }
diff --git a/src/waker_ref.rs b/src/waker_ref.rs
index 7fb552f..76d849a 100644
--- a/src/waker_ref.rs
+++ b/src/waker_ref.rs
@@ -1,10 +1,10 @@
-use super::arc_wake::ArcWake;
+use super::arc_wake::{ArcWake};
 use super::waker::waker_vtable;
 use alloc::sync::Arc;
-use core::marker::PhantomData;
 use core::mem::ManuallyDrop;
+use core::marker::PhantomData;
 use core::ops::Deref;
-use core::task::{RawWaker, Waker};
+use core::task::{Waker, RawWaker};
 
 /// A [`Waker`] that is only valid for a given lifetime.
 ///
@@ -22,7 +22,10 @@ impl<'a> WakerRef<'a> {
         // copy the underlying (raw) waker without calling a clone,
         // as we won't call Waker::drop either.
         let waker = ManuallyDrop::new(unsafe { core::ptr::read(waker) });
-        Self { waker, _marker: PhantomData }
+        Self {
+            waker,
+            _marker: PhantomData,
+        }
     }
 
     /// Create a new [`WakerRef`] from a [`Waker`] that must not be dropped.
@@ -32,7 +35,10 @@ impl<'a> WakerRef<'a> {
     /// by the caller), and the [`Waker`] doesn't need to or must not be
     /// destroyed.
     pub fn new_unowned(waker: ManuallyDrop<Waker>) -> Self {
-        Self { waker, _marker: PhantomData }
+        Self {
+            waker,
+            _marker: PhantomData,
+        }
     }
 }
 
@@ -51,13 +57,14 @@ impl Deref for WakerRef<'_> {
 #[inline]
 pub fn waker_ref<W>(wake: &Arc<W>) -> WakerRef<'_>
 where
-    W: ArcWake,
+    W: ArcWake
 {
     // simply copy the pointer instead of using Arc::into_raw,
     // as we don't actually keep a refcount by using ManuallyDrop.<
-    let ptr = Arc::as_ptr(wake).cast::<()>();
+    let ptr = (&**wake as *const W) as *const ();
 
-    let waker =
-        ManuallyDrop::new(unsafe { Waker::from_raw(RawWaker::new(ptr, waker_vtable::<W>())) });
+    let waker = ManuallyDrop::new(unsafe {
+        Waker::from_raw(RawWaker::new(ptr, waker_vtable::<W>()))
+    });
     WakerRef::new_unowned(waker)
 }