Fixed a special case in the expression parser

src/expression/Operator.go

@@ -63,6 +63,10 @@ func isComplete(expr *Expression) bool {
 		return true
 	}
 
+	if expr.Token.Kind == token.Call {
+		return true
+	}
+
 	if expr.Token.IsOperator() && len(expr.Children) == numOperands(expr.Token.Kind) {
 		return true
 	}