The function parameter model has been modified to support the passing of named parameters

operand-var.go

@@ -25,7 +25,7 @@ func evalVar(ctx ExprContext, opTerm *term) (v any, err error) {
 	var exists bool
 	name := opTerm.source()
 	if v, exists = GetVar(ctx, name); !exists {
-		if info, exists, _ := GetFuncInfo(ctx, name); exists {
+		if info, exists := GetFuncInfo(ctx, name); exists {
 			v = info.Functor()
 		} else {
 			err = fmt.Errorf("undefined variable or function %q", name)