diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index 13180e6..116f713 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -502,6 +502,7 @@
   call assert_fails('echo funcref("{")', 'E475:')
   let OneByRef = funcref("One", repeat(["foo"], 20))
   call assert_fails('let OneByRef = funcref("One", repeat(["foo"], 21))', 'E118:')
+  call assert_fails('echo function("min") =~ function("min")', 'E694:')
 endfunc
 
 func Test_setmatches()