Index: src/GenPoly/ScrubTyVars.h
===================================================================
--- src/GenPoly/ScrubTyVars.h	(revision c8837e5f0d9b9ee1ca54309ed7dd8ac35aeb40ff)
+++ src/GenPoly/ScrubTyVars.h	(revision fad1f145f5f674f5bad6113c497f14aae8d41ec1)
@@ -116,5 +116,5 @@
 		node_t const * target, const TypeVarMap & typeVars ) {
 	return strict_dynamic_cast<node_t const *>(
-			scrubTypeVars<ast::Node>( target ) );
+			scrubTypeVars<ast::Node>( target, typeVars ) );
 }