1 files changed, 1 insertions, 0 deletions
diff --git a/src/sdp.d b/src/sdp.d
index 4fcabfb..94ef276 100755
--- a/src/sdp.d
+++ b/src/sdp.d
@@ -227,6 +227,7 @@ void main(string[] args) {
         _opt_action_bool
       );
       static assert(!isTypeTuple!(t));
+      static assert(t.length==3);
       auto doc_abstraction = t[0]; // head ~ toc ~ contents ~ endnotes_seg ~ glossary ~ bibliography ~ bookindex ~blurb;
       string[][string] _document_section_keys_sequenced = t[1];
       string[] _doc_html_segnames = t[2];