Index: src/ResolvExpr/Candidate.hpp
===================================================================
--- src/ResolvExpr/Candidate.hpp	(revision 234b1cb4afd88ccf2b1f3e001a2eae5dc12ca39b)
+++ src/ResolvExpr/Candidate.hpp	(revision 325e6ea3f194ad588ab061cdd3cc9daa9ebcc1c3)
@@ -51,14 +51,20 @@
 
 	Candidate( const ast::Expr * x, const ast::TypeEnvironment & e )
-	: expr( x ), cost( Cost::zero ), cvtCost( Cost::zero ), env( e ), open(), need() {}
+	: expr( x ), cost( Cost::zero ), cvtCost( Cost::zero ), env( e ), open(), need() {
+		assert(x->result);
+	}
 
 	Candidate( const Candidate & o, const ast::Expr * x, const Cost & addedCost = Cost::zero )
 	: expr( x ), cost( o.cost + addedCost ), cvtCost( Cost::zero ), env( o.env ), open( o.open ),
-	  need( o.need ) {}
+	  need( o.need ) {
+		assert(x->result);
+	}
 
 	Candidate(
-		const ast::Expr * x, const ast::TypeEnvironment & e, const ast::OpenVarSet & o, 
+		const ast::Expr * x, const ast::TypeEnvironment & e, const ast::OpenVarSet & o,
 		const ast::AssertionSet & n, const Cost & c, const Cost & cvt = Cost::zero )
-	: expr( x ), cost( c ), cvtCost( cvt ), env( e ), open( o ), need( n.begin(), n.end() ) {}
+	: expr( x ), cost( c ), cvtCost( cvt ), env( e ), open( o ), need( n.begin(), n.end() ) {
+		assert(x->result);
+	}
 
 	Candidate(
@@ -66,5 +72,7 @@
 		ast::AssertionSet && n, const Cost & c, const Cost & cvt = Cost::zero )
 	: expr( x ), cost( c ), cvtCost( cvt ), env( std::move( e ) ), open( std::move( o ) ),
-	  need( n.begin(), n.end() ) {}
+	  need( n.begin(), n.end() ) {
+		assert(x->result);
+	}
 };