Later they discover that they were never executing their modified function because of some procedural error such as failing to recompile the source, relink the executable, or rebuild a jar.

• 接着发现再也无法执行这个修改过的函数，因为其中某个程序有误，像无法重新编译源代码、重新连接可执行文件或是重新生成jar文件。