Satisfy clippy.

src/fn_hash.rs

@@ -124,7 +124,10 @@ pub fn calc_fn_hash(fn_name: &str, num: usize) -> u64 {
 pub fn calc_fn_params_hash(params: impl Iterator<Item = TypeId>) -> u64 {
     let s = &mut get_hasher();
     let mut len = 0;
-    params.inspect(|_| len += 1).for_each(|t| t.hash(s));
+    params.for_each(|t| {
+        len += 1;
+        t.hash(s);
+    });
     len.hash(s);
     s.finish()
 }