diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 9e420ad..75d0dd0 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1757,6 +1757,21 @@
   CheckScriptFailure(lines, 'E1173: Text found after endfunction: BBBB')
 enddef
 
+def Test_error_in_function_args()
+  var lines =<< trim END
+      def FirstFunction()
+        def SecondFunction(J  =
+        # Nois
+        # one
+         
+         enddef|BBBB
+      enddef
+      # Compile all functions
+      defcompile
+  END
+  CheckScriptFailure(lines, 'E488:')
+enddef
+
 def Test_return_type_wrong()
   CheckScriptFailure([
         'def Func(): number',
@@ -2048,7 +2063,6 @@
 endfunc
 
 def Run_Test_free_dict_while_in_funcstack()
-
   # this was freeing the TermRun() default argument dictionary while it was
   # still referenced in a funcstack_T
   var lines =<< trim END