1 files changed, 5 insertions, 2 deletions
diff --git a/src/sdp/source_sisupod.d b/src/sdp/source_sisupod.d
index 3cd5b94..20e0ef1 100644
--- a/src/sdp/source_sisupod.d
+++ b/src/sdp/source_sisupod.d
@@ -1,9 +1,12 @@
 template SiSUpod() {
   struct SDPsisupod {
     
-    void sisupod_assemble(
-      string fn_src,
+    void sisupod_assemble(S)(
+      S fn_src,
     ) {
+      debug(asserts){
+        static assert(is(typeof(fn_src) == string));
+      }
       mixin SiSUpaths;
       auto pth_sisupod = SiSUpodPaths();
       mixin SiSUlanguageCodes;