fix clippy

Signed-off-by: Runji Wang <[email protected]>

madsim-rdkafka/src/std/mocking.rs

@@ -38,6 +38,7 @@ use crate::ClientContext;
 ///
 ///   In this case, we **must neither** destroy the mock cluster in `MockCluster`'s `drop()`,
 ///   **nor** outlive the `Client` from which the reference is obtained, hence the lifetime.
+#[allow(dead_code)]
 enum MockClusterClient<'c, C: ClientContext> {
     Owned(Client<C>),
     Borrowed(&'c Client<C>),

madsim-tokio/src/sim/runtime.rs

@@ -50,6 +50,7 @@ pub struct Runtime {
     abort_handles: Mutex<Vec<AbortHandle>>,
 }
 
+#[allow(dead_code)]
 pub struct EnterGuard<'a>(&'a Runtime);
 
 impl Runtime {

madsim/src/sim/rand.rs

@@ -180,7 +180,7 @@ fn init_std_random_state(seed: u64) -> bool {
 }
 
 thread_local! {
-    static SEED: Cell<Option<u64>> = Cell::new(None);
+    static SEED: Cell<Option<u64>> = const { Cell::new(None) };
 }
 
 /// Obtain a series of random bytes.

madsim/src/sim/runtime/context.rs

@@ -7,8 +7,8 @@ use crate::{
 use std::{cell::RefCell, sync::Arc};
 
 thread_local! {
-    static CONTEXT: RefCell<Option<Handle>> = RefCell::new(None);
-    static TASK: RefCell<Option<Arc<TaskInfo>>> = RefCell::new(None);
+    static CONTEXT: RefCell<Option<Handle>> = const { RefCell::new(None) };
+    static TASK: RefCell<Option<Arc<TaskInfo>>> = const { RefCell::new(None) };
 }
 
 pub(crate) fn current<T>(map: impl FnOnce(&Handle) -> T) -> T {