Index: src/GenPoly/Box.cc
===================================================================
--- src/GenPoly/Box.cc	(revision 408d460b6eee7c0426d19f157e42b5879e8af665)
+++ src/GenPoly/Box.cc	(revision 98735ef93efbdeff0d764e4f0c39fc14c31e1f6b)
@@ -1399,5 +1399,5 @@
 				delete memberExpr;
 				return fieldLoc;
-			} else if ( UnionInstType *unionType = dynamic_cast< UnionInstType* >( objectType ) ) {
+			} else if ( dynamic_cast< UnionInstType* >( objectType ) ) {
 				// union members are all at offset zero, so build appropriately-dereferenced variable
 				Expression *derefdVar = makeDerefdVar( varExpr->clone(), varDepth );