Index: src/Tuples/TupleExpansion.cc
===================================================================
--- src/Tuples/TupleExpansion.cc	(revision ab904dc2d88885a200b84e36078cc551c9a2472f)
+++ src/Tuples/TupleExpansion.cc	(revision af397ef8f0a43077863974fc725f7ae0d12ca892)
@@ -354,5 +354,5 @@
 				maybeImpure = true;
 			}
-			virtual void visit( UntypedExpr * untypedExpr ) { maybeImpure = true; }
+			virtual void visit( __attribute__((unused)) UntypedExpr * untypedExpr ) { maybeImpure = true; }
 			bool maybeImpure = false;
 		};