diff --git a/src/testdir/test_syntax.vim b/src/testdir/test_syntax.vim
index 389294e..8197f1a 100644
--- a/src/testdir/test_syntax.vim
+++ b/src/testdir/test_syntax.vim
@@ -532,6 +532,8 @@
   call assert_equal(['cComment', 'cTodo'], map(synstack(line("."), col(".")), 'synIDattr(v:val, "name")'))
   call assert_equal(['Comment', 'Todo'],   map(synstack(line("."), col(".")), 'synIDattr(synIDtrans(v:val), "name")'))
 
+  call assert_fails("let n=synIDtrans([])", 'E745:')
+
   syn clear
   bw!
 endfunc
@@ -631,3 +633,5 @@
   call delete('Xccc.c')
   call delete('Xddd.c')
 endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab