m: Remove dependency on waker-fn

Cargo.toml

@@ -21,7 +21,7 @@ exclude = ["/.*"]
 
 [features]
 default = ["race", "std"]
-std = ["alloc", "fastrand/std", "futures-io", "parking", "memchr", "waker-fn"]
+std = ["alloc", "fastrand/std", "futures-io", "parking", "memchr"]
 alloc = []
 race = ["fastrand"]
 
@@ -30,9 +30,9 @@ fastrand = { version = "2.0.0", optional = true, default-features = false }
 futures-core = { version = "0.3.5", default-features = false }
 futures-io = { version = "0.3.5", optional = true }
 memchr = { version = "2.3.3", optional = true }
-parking = { version = "2.0.0", optional = true }
+parking = { version = "2.2.0", optional = true }
 pin-project-lite = "0.2.0"
-waker-fn = { version = "1.0.0", optional = true }
 
 [dev-dependencies]
 spin_on = "0.1.0"
+waker-fn = "1.0.0" # used in doctests

src/future.rs

@@ -58,7 +58,6 @@ pub fn block_on<T>(future: impl Future<Output = T>) -> T {
     use core::task::Waker;
 
     use parking::Parker;
-    use waker_fn::waker_fn;
 
     // Pin the future on the stack.
     crate::pin!(future);
@@ -67,9 +66,7 @@ pub fn block_on<T>(future: impl Future<Output = T>) -> T {
     fn parker_and_waker() -> (Parker, Waker) {
         let parker = Parker::new();
         let unparker = parker.unparker();
-        let waker = waker_fn(move || {
-            unparker.unpark();
-        });
+        let waker = Waker::from(unparker);
         (parker, waker)
     }