diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index a644e17..6428e63 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -3214,6 +3214,14 @@
   END
   CheckScriptSuccess(lines)
 
+  lines =<< trim END
+      vim9script
+      import './Xsquare.vim'
+
+      echo range(5)->Xsquare.NoSuchFunc()
+  END
+  CheckScriptFailure(lines, 'E1048: Item not found in script: NoSuchFunc')
+
   delete('Xsquare.vim')
 enddef