Update clippy_lints/src/format_args.rs

Co-authored-by: Cameron Steffen <cam.steffen94@gmail.com>

Author: smoelius

clippy_lints/src/format_args.rs

@@ -117,7 +117,7 @@ fn check_to_string_in_format_args<'tcx>(
 ) {
     let value = arg.value;
     if_chain! {
-        if let ExprKind::MethodCall(_, _, args, _) = value.kind;
+        if let ExprKind::MethodCall(_, _, [receiver], span) = value.kind;
         if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(value.hir_id);
         if match_def_path(cx, method_def_id, &paths::TO_STRING_METHOD);
         if let Some(receiver) = args.get(0);