Index: src/ResolvExpr/AlternativeFinder.cc
===================================================================
--- src/ResolvExpr/AlternativeFinder.cc	(revision d551d0a2adefe8ac465d8cb523460251ca58c873)
+++ src/ResolvExpr/AlternativeFinder.cc	(revision 76a395a555cd3dd6f5f0eed8f581e1f1af4fa242)
@@ -594,4 +594,5 @@
 			for (unsigned i = 0; i < tupleEls.back(); ++i) {
 				exprs.push_front( actuals.back().expr );
+				actuals.back().expr = nullptr;
 				cost += actuals.back().cost;
 				actuals.pop_back();