diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b6201fc7a..ab429d0f9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,6 +12,11 @@ jobs:
     name: run
     runs-on: ubuntu-22.04
 
+    strategy:
+      matrix:
+        featureflags:
+        - --features clock-timer,h,lazy-wrap,string-pool,tokio
+
     steps:
     - name: checkout code
       uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
@@ -20,10 +25,10 @@ jobs:
       run: rustc --version
 
     - name: build
-      run: cargo build --all-features --verbose
+      run: cargo build --release --verbose ${{ matrix.featureflags }}
 
     - name: test
-      run: cargo test --all-features --release --verbose
+      run: cargo test --release --verbose ${{ matrix.featureflags }}
       env:
         LLVM_PROFILE_FILE: "target/coverage/test-file.profraw"
         CARGO_INCREMENTAL: "0"
diff --git a/src/clock_timer.rs b/src/clock_timer.rs
index 0bc0dab78..2fc1b9663 100644
--- a/src/clock_timer.rs
+++ b/src/clock_timer.rs
@@ -4,7 +4,7 @@ super::runtime_selection_compile_check!("clock-timer");
 pub use tokio::*;
 #[cfg(feature = "tokio")]
 mod tokio {
-	use ::chrono::{ DateTime, Local, NaiveDateTime, ParseError, Timelike as _, Utc };
+	use ::chrono::{ DateTime, Local, NaiveDateTime, ParseError };
 	pub use ::chrono::TimeDelta;
 	use ::thiserror::Error;
 
diff --git a/src/lib.rs b/src/lib.rs
index c89e9be27..ff3698f81 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -59,4 +59,5 @@ macro_rules! runtime_selection_compile_check {
 		compile_error!(concat!("an async runtime is required to make use of `", $featname, "`; available runtimes (enable by selecting the crate feature): `tokio`"));
 	}
 }
+#[allow(unused)]
 use runtime_selection_compile_check;
diff --git a/src/string_pool/pool/global.rs b/src/string_pool/pool/global.rs
index 5d4806610..5b846124d 100644
--- a/src/string_pool/pool/global.rs
+++ b/src/string_pool/pool/global.rs
@@ -80,7 +80,7 @@ impl<'h> Equivalent<<GlobalPool as Pool>::Raw> for SlicesWrap<'h> {
 				//    - if a == b, good but not done yet, continue
 				(Some(a), Some(b)) if a == b => { continue }
 				//    - else (a != b), not good, return false
-				(Some(a), Some(b)) => { return false }
+				(Some(_), Some(_)) => { return false }
 
 				// Some None
 				// None Some