chagned Value_t to use unsafe.Pointer

bin/main.go

@@ -71,10 +71,10 @@ func main() {
 		goto oops
 	}
 
-	if v == nil {
-		panic("return value mut not be nil")
+	if v.Kind != pcl.VALUE_STR {
+		panic("return value must not be string")
 	}
-	fmt.Printf("RETURN VALUE = [%s]\n", *v.(*string))
+	fmt.Printf("RETURN VALUE = [%s]\n", *(*string)(v.V))
 
 	interp.Close()
 	f.Close()