diff --git a/cortex-m-semihosting/src/debug.rs b/cortex-m-semihosting/src/debug.rs
index a4fa6d83..7c7ff9d1 100644
--- a/cortex-m-semihosting/src/debug.rs
+++ b/cortex-m-semihosting/src/debug.rs
@@ -11,16 +11,14 @@
 //! ```no_run
 //! use cortex_m_semihosting::debug::{self, EXIT_SUCCESS, EXIT_FAILURE};
 //!
-//! fn main() {
-//!     if 2 == 2 {
-//!         // report success
-//!         debug::exit(EXIT_SUCCESS);
-//!     } else {
-//!         // report failure
-//!         debug::exit(EXIT_FAILURE);
-//!     }
+//! if 2 == 2 {
+//!     // report success
+//!     debug::exit(EXIT_SUCCESS);
+//! } else {
+//!     // report failure
+//!     debug::exit(EXIT_FAILURE);
 //! }
-//!
+//! ```
 
 /// This values are taken from section 5.5.2 of
 /// ADS Debug Target Guide (DUI0058).
diff --git a/cortex-m/src/peripheral/scb.rs b/cortex-m/src/peripheral/scb.rs
index b9cf0e4b..b10f9d20 100644
--- a/cortex-m/src/peripheral/scb.rs
+++ b/cortex-m/src/peripheral/scb.rs
@@ -664,10 +664,7 @@ impl SCB {
     /// a runtime-dependent `panic!()` call.
     #[inline]
     pub unsafe fn invalidate_dcache_by_slice<T>(&mut self, slice: &mut [T]) {
-        self.invalidate_dcache_by_address(
-            slice.as_ptr() as usize,
-            slice.len() * core::mem::size_of::<T>(),
-        );
+        self.invalidate_dcache_by_address(slice.as_ptr() as usize, core::mem::size_of_val(slice));
     }
 
     /// Cleans D-cache by address.
@@ -750,10 +747,7 @@ impl SCB {
     /// to main memory, overwriting whatever was in main memory.
     #[inline]
     pub fn clean_dcache_by_slice<T>(&mut self, slice: &[T]) {
-        self.clean_dcache_by_address(
-            slice.as_ptr() as usize,
-            slice.len() * core::mem::size_of::<T>(),
-        );
+        self.clean_dcache_by_address(slice.as_ptr() as usize, core::mem::size_of_val(slice));
     }
 
     /// Cleans and invalidates D-cache by address.
diff --git a/xtask/tests/ci.rs b/xtask/tests/ci.rs
index 1dc4754c..3c3ef990 100644
--- a/xtask/tests/ci.rs
+++ b/xtask/tests/ci.rs
@@ -27,16 +27,16 @@ static NON_BASE_TARGETS: &[&str] = &[
 fn build(package: &str, target: &str, features: &[&str]) {
     println!("building {} for {} {:?}", package, target, features);
     let mut cargo = Command::new("cargo");
-    cargo.args(&["build", "-p", package, "--target", target]);
+    cargo.args(["build", "-p", package, "--target", target]);
     for feat in features {
-        cargo.args(&["--features", *feat]);
+        cargo.args(["--features", *feat]);
     }
 
     // A `critical_section` implementation is always needed.
     if package == "cortex-m" {
-        cargo.args(&["--features", "critical-section-single-core"]);
+        cargo.args(["--features", "critical-section-single-core"]);
     } else {
-        cargo.args(&["--features", "cortex-m/critical-section-single-core"]);
+        cargo.args(["--features", "cortex-m/critical-section-single-core"]);
     }
 
     // Cargo features don't work right when invoked from the workspace root, so change to the
@@ -77,7 +77,7 @@ fn check_crates_build(_is_nightly: bool) {
             let used_features = &*all_features
                 .iter()
                 .copied()
-                .filter(|feat| should_use_feature(*feat))
+                .filter(|feat| should_use_feature(feat))
                 .collect::<Vec<_>>();
 
             // (note: we don't test with default features disabled, since we don't use them yet)