Index: src/SynTree/TypeSubstitution.h
===================================================================
--- src/SynTree/TypeSubstitution.h	(revision 84bb4d9e5e8e19a101f959de114293008192d69a)
+++ src/SynTree/TypeSubstitution.h	(revision d8ba08645e3a1d872799a07b1bf581390d8798ce)
@@ -10,5 +10,5 @@
 // Created On       : Mon May 18 07:44:20 2015
 // Last Modified By : Rob Schluntz
-// Last Modified On : Tue Apr 26 11:15:07 2016
+// Last Modified On : Fri Apr 29 13:50:09 2016
 // Update Count     : 2
 //
@@ -152,4 +152,5 @@
 template< typename TypeInstListIterator >
 void TypeSubstitution::extract( TypeInstListIterator begin, TypeInstListIterator end, TypeSubstitution &result ) {
+	// xxx - this function doesn't extract varEnv - is this intentional?
 	while ( begin != end ) {
 		TypeEnvType::iterator cur = typeEnv.find( (*begin++)->get_name() );