Clean up clippy.

src/func/hashing.rs

@@ -173,10 +173,10 @@ pub fn calc_fn_hash(fn_name: &str, num: usize) -> u64 {
 pub fn calc_fn_params_hash(params: impl IntoIterator<Item = TypeId>) -> u64 {
     let s = &mut get_hasher();
     let mut len = 0;
-    params
-        .into_iter()
-        .inspect(|_| len += 1)
-        .for_each(|t| t.hash(s));
+    params.into_iter().for_each(|t| {
+        len += 1;
+        t.hash(s)
+    });
     len.hash(s);
 
     match s.finish() {