diff --git a/vm/src/stdlib/multiprocessing.rs b/vm/src/stdlib/multiprocessing.rs
index 99cb5a1e89..b1848e5b37 100644
--- a/vm/src/stdlib/multiprocessing.rs
+++ b/vm/src/stdlib/multiprocessing.rs
@@ -18,7 +18,7 @@ mod _multiprocessing {
 
     #[pyfunction]
     fn recv(socket: usize, size: usize, vm: &VirtualMachine) -> PyResult<libc::c_int> {
-        let mut buf = vec![0 as libc::c_char; size];
+        let mut buf = vec![0; size];
         let nread =
             unsafe { winsock2::recv(socket as SOCKET, buf.as_mut_ptr() as *mut _, size as i32, 0) };
         if nread < 0 {
diff --git a/vm/src/stdlib/os.rs b/vm/src/stdlib/os.rs
index eaf702e719..bcc50da1b4 100644
--- a/vm/src/stdlib/os.rs
+++ b/vm/src/stdlib/os.rs
@@ -3716,7 +3716,7 @@ mod nt {
                 }
             }
         }
-        return Err(err.into_pyexception(vm));
+        Err(err.into_pyexception(vm))
     }
 
     #[pyfunction]
diff --git a/vm/src/stdlib/winapi.rs b/vm/src/stdlib/winapi.rs
index 397d353eac..5ca3e20712 100644
--- a/vm/src/stdlib/winapi.rs
+++ b/vm/src/stdlib/winapi.rs
@@ -258,9 +258,9 @@ fn getattributelist(obj: PyObjectRef, vm: &VirtualMachine) -> PyResult<Option<At
                 .get_item_option("handle_list", vm)?
                 .and_then(|obj| {
                     <Option<PySequence<usize>>>::try_from_object(vm, obj)
-                        .and_then(|s| match s {
-                            Some(s) if !s.as_slice().is_empty() => Ok(Some(s.into_vec())),
-                            _ => Ok(None),
+                        .map(|s| match s {
+                            Some(s) if !s.as_slice().is_empty() => Some(s.into_vec()),
+                            _ => None,
                         })
                         .transpose()
                 })
diff --git a/vm/src/stdlib/winreg.rs b/vm/src/stdlib/winreg.rs
index 2c751be574..d1793acbc1 100644
--- a/vm/src/stdlib/winreg.rs
+++ b/vm/src/stdlib/winreg.rs
@@ -276,7 +276,7 @@ fn reg_to_py(value: RegValue, vm: &VirtualMachine) -> PyResult {
                 .collect();
             Ok(vm.ctx.new_list(strings))
         }
-        RegType::REG_BINARY | _ => {
+        _ => {
             if value.bytes.is_empty() {
                 Ok(vm.ctx.none())
             } else {
diff --git a/vm/src/sysmodule.rs b/vm/src/sysmodule.rs
index 1dcac442e2..7a4461d463 100644
--- a/vm/src/sysmodule.rs
+++ b/vm/src/sysmodule.rs
@@ -294,8 +294,10 @@ fn sys_getwindowsversion(vm: &VirtualMachine) -> PyResult<crate::builtins::tuple
         winnt::{LPOSVERSIONINFOEXW, LPOSVERSIONINFOW, OSVERSIONINFOEXW},
     };
 
-    let mut version = OSVERSIONINFOEXW::default();
-    version.dwOSVersionInfoSize = std::mem::size_of::<OSVERSIONINFOEXW>() as u32;
+    let mut version = OSVERSIONINFOEXW {
+        dwOSVersionInfoSize: std::mem::size_of::<OSVERSIONINFOEXW>() as u32,
+        ..OSVERSIONINFOEXW::default()
+    };
     let result = unsafe {
         let osvi = &mut version as LPOSVERSIONINFOEXW as LPOSVERSIONINFOW;
         // SAFETY: GetVersionExW accepts a pointer of OSVERSIONINFOW, but winapi crate's type currently doesn't allow to do so.