chore: use Duration::MAX instead of duration_max

.github/workflows/ci.yml

@@ -112,7 +112,7 @@ jobs:
         os: [ubuntu-latest, windows-latest]
         # When updating this, the reminder to update the minimum supported
         # Rust version in Cargo.toml.
-        rust: ['1.48']
+        rust: ['1.53']
     steps:
       - uses: actions/checkout@v3
       - name: Install Rust

Cargo.toml

@@ -6,7 +6,7 @@ name = "async-io"
 version = "1.13.0"
 authors = ["Stjepan Glavina <stjepang@gmail.com>"]
 edition = "2018"
-rust-version = "1.48"
+rust-version = "1.53"
 description = "Async I/O and timers"
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/smol-rs/async-io"

src/lib.rs

@@ -91,11 +91,6 @@ mod reactor;
 pub use driver::block_on;
 pub use reactor::{Readable, ReadableOwned, Writable, WritableOwned};
 
-/// Use `Duration::MAX` once `duration_constants` are stabilized.
-fn duration_max() -> Duration {
-    Duration::new(std::u64::MAX, 1_000_000_000 - 1)
-}
-
 /// A future or stream that emits timed events.
 ///
 /// Timers are futures that output a single [`Instant`] when they fire.
@@ -193,7 +188,7 @@ impl Timer {
         Timer {
             id_and_waker: None,
             when: None,
-            period: duration_max(),
+            period: Duration::MAX,
         }
     }
 
@@ -231,7 +226,7 @@ impl Timer {
     /// ```
     pub fn at(instant: Instant) -> Timer {
         // Use Duration::MAX once duration_constants are stabilized.
-        Timer::interval_at(instant, duration_max())
+        Timer::interval_at(instant, Duration::MAX)
     }
 
     /// Creates a timer that emits events periodically.