use cx.tcx.def_span

as recommended in
rust-lang#15461 (comment)

Author: ada4a

clippy_lints/src/functions/mod.rs

@@ -502,7 +502,7 @@ impl<'tcx> LateLintPass<'tcx> for Functions {
         def_id: LocalDefId,
     ) {
         let hir_id = cx.tcx.local_def_id_to_hir_id(def_id);
-        too_many_arguments::check_fn(cx, kind, decl, span, hir_id, self.too_many_arguments_threshold);
+        too_many_arguments::check_fn(cx, kind, decl, hir_id, def_id, self.too_many_arguments_threshold);
         too_many_lines::check_fn(cx, kind, span, body, self.too_many_lines_threshold);
         not_unsafe_ptr_arg_deref::check_fn(cx, kind, decl, body, def_id);
         misnamed_getters::check_fn(cx, kind, decl, body, span);

clippy_lints/src/functions/too_many_arguments.rs

@@ -1,5 +1,6 @@
 use rustc_abi::ExternAbi;
 use rustc_hir as hir;
+use rustc_hir::def_id::LocalDefId;
 use rustc_hir::intravisit::FnKind;
 use rustc_lint::LateContext;
 use rustc_span::Span;
@@ -13,21 +14,16 @@ pub(super) fn check_fn(
     cx: &LateContext<'_>,
     kind: FnKind<'_>,
     decl: &hir::FnDecl<'_>,
-    span: Span,
     hir_id: hir::HirId,
+    def_id: LocalDefId,
     too_many_arguments_threshold: u64,
 ) {
     // 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
         && 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,
-        );
+        check_arg_number(cx, decl, cx.tcx.def_span(def_id), too_many_arguments_threshold);
     }
 }