Index: src/Tuples/TupleExpansion.cc
===================================================================
--- src/Tuples/TupleExpansion.cc	(revision c93bc28fc58cf97703952c9f870947a14d155972)
+++ src/Tuples/TupleExpansion.cc	(revision f65822430a8f660dc48e724c1be1ea7c9978fa0b)
@@ -230,11 +230,5 @@
 		for ( auto p : group_iterate( tupleType->get_types(), decl->get_parameters() ) ) {
 			Type * t = std::get<0>(p);
-			TypeDecl * td = std::get<1>(p);
 			newType->get_parameters().push_back( new TypeExpr( t->clone() ) );
-			if ( env ) {
-				// add bindings to the type environment.
-				// xxx - This may not be sufficient, it may be necessary to rename type variables on StructInstType?
-				env->add( td->get_name(), t->clone() );
-			}
 		}
 		delete tupleType;