use FnKind::header

Author: ada4a

clippy_lints/src/functions/too_many_arguments.rs

@@ -20,18 +20,13 @@ pub(super) fn check_fn(
     // don't warn for implementations, it's not their fault
     if !is_trait_impl_item(cx, hir_id) {
         // don't lint extern functions decls, it's not their fault either
-        match kind {
-            FnKind::Method(_, &hir::FnSig { header, .. }) | FnKind::ItemFn(_, _, header)
-                if header.abi == ExternAbi::Rust =>
-            {
-                check_arg_number(
-                    cx,
-                    decl,
-                    span.with_hi(decl.output.span().hi()),
-                    too_many_arguments_threshold,
-                )
-            },
-            _ => {},
+        if kind.header().is_some_and(|header| header.abi == ExternAbi::Rust) {
+            check_arg_number(
+                cx,
+                decl,
+                span.with_hi(decl.output.span().hi()),
+                too_many_arguments_threshold,
+            );
         }
     }
 }