Index: src/GenPoly/Box.cc
===================================================================
--- src/GenPoly/Box.cc	(revision 168c00725d596f275bf593f63791743073a1778b)
+++ src/GenPoly/Box.cc	(revision f5392c1db4bb1b778c34b7d634a0224a8c9615d2)
@@ -1298,5 +1298,5 @@
 			FunctionType * ftype = functionDecl->get_functionType();
 			if ( ! ftype->get_returnVals().empty() && functionDecl->get_statements() ) {
-				if ( functionDecl->get_name() != "?=?" && ! isPrefix( functionDecl->get_name(), "_thunk" ) ) { // xxx - remove check for ?=? once reference types are in; remove check for prefix once thunks properly use ctor/dtors
+				if ( functionDecl->get_name() != "?=?" && ! isPrefix( functionDecl->get_name(), "_thunk" ) && ! isPrefix( functionDecl->get_name(), "_adapter" ) ) { // xxx - remove check for ?=? once reference types are in; remove check for prefix once thunks properly use ctor/dtors
 					assert( ftype->get_returnVals().size() == 1 );
 					DeclarationWithType * retval = ftype->get_returnVals().front();