From 44fe3f0e76ee22b112f6beba277cf095f77e6738 Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Sat, 11 Mar 2023 11:50:01 +0100
Subject: [PATCH 1/2] Make use of pin! stabilization

---
 src/lib.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index ece529d..95ad175 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,6 +16,7 @@
 //! ```
 #![forbid(unsafe_code)]
 use std::future::Future;
+use std::pin::Pin;
 use std::sync::Arc;
 use std::sync::Condvar;
 use std::sync::Mutex;
@@ -60,10 +61,15 @@ impl Wake for CondvarWake {
 }
 
 /// Block on specified [`Future`].
+///
+/// The future will be polled until completion on the current thread.
 pub fn execute<T>(f: impl Future<Output = T>) -> T {
-    // TODO: replace with std::pin::pin once it gets stabilized
-    let mut pinned = Box::pin(f);
+    // Use dynamic dispatch to save on codegen
+    poll(std::pin::pin!(f))
+}
 
+/// Poll a future until completion.
+fn poll<T>(mut pinned: Pin<&mut dyn Future<Output = T>>) -> T {
     let wake = Arc::new(CondvarWake::default());
     let waker = Waker::from(Arc::clone(&wake));
 

From b7e0f8e252be5f9f23321ba9dbcdf0ff6e646ce1 Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Sat, 11 Mar 2023 12:12:54 +0100
Subject: [PATCH 2/2] Increase MSRV to 1.68

---
 .github/workflows/ci.yml | 2 +-
 CHANGELOG.md             | 9 +++++++++
 Cargo.toml               | 5 ++---
 README.md                | 9 +++++----
 4 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a20d1bb..654a813 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,7 +39,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@v1
         with:
-          toolchain: "1.51"
+          toolchain: "1.68"
 
       - run: cargo test
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index caabcfc..27fd992 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Use dynamic dispatch internally to save on code gen. External API unchanged.
+- No longer heap-allocate futures.
+
+### Breaking
+
+- Minimum supported Rust version bumped to 1.68.
+
 ## [0.1.1] - 2022-09-05
 
 ### Fixed
diff --git a/Cargo.toml b/Cargo.toml
index dbb256e..7ee9ff5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,12 +1,11 @@
 [package]
 name = "beul"
 version = "0.1.1"
-# Edition 2021 is not available in MSRV
-edition = "2018"
+edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "It executes futures"
 repository = "https://github.com/bertptrs/beul/"
-rust-version = "1.51"
+rust-version = "1.68"
 authors = [
     "Bert Peters",
 ]
diff --git a/README.md b/README.md
index e3b0e85..6b2899a 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Beul
 
-Beul is a minimalistic futures executor. No dependencies, no unsafe rust.
+Beul is a minimalistic futures executor. No dependencies, no unsafe rust. It simply executes
+futures.
 
 ## Usage
 
@@ -12,8 +13,8 @@ beul::execute(async {});
 
 ### Backwards compatibility
 
-This crate requires at least Rust 1.51, due to its reliance on [Wake]. Increases in this version
-will be considered breaking changes. This crate follows semantic versioning.
+This crate requires at least Rust 1.68, due to its reliance on [std::pin::pin!]. Increases in this
+version will be considered breaking changes. This crate follows semantic versioning.
 
 ### Limitations
 
@@ -37,4 +38,4 @@ work by you, as defined in the Apache-2.0 license, shall be dual licensed as abo
 additional terms or conditions.
 
 [Tokio]: https://tokio.rs/
-[Wake]: https://doc.rust-lang.org/std/task/trait.Wake.html
+[std::pin::pin!]: https://doc.rust-lang.org/std/pin/macro.pin.html