diff --git a/src/testdir/test_substitute.vim b/src/testdir/test_substitute.vim
index 2ac6f45..b4105fa 100644
--- a/src/testdir/test_substitute.vim
+++ b/src/testdir/test_substitute.vim
@@ -242,6 +242,11 @@
   setl nomodifiable
   call assert_fails('s/foo/bar/', 'E21:')
 
+  call assert_fails("let s=substitute([], 'a', 'A', 'g')", 'E730:')
+  call assert_fails("let s=substitute('abcda', [], 'A', 'g')", 'E730:')
+  call assert_fails("let s=substitute('abcda', 'a', [], 'g')", 'E730:')
+  call assert_fails("let s=substitute('abcda', 'a', 'A', [])", 'E730:')
+
   bwipe!
 endfunc