定义 https://en.wikipedia.org/wiki/Unreachable_code
Remove unreachable code refactoring
https://docs.microsoft.com/en-us/visualstudio/ide/reference/remove-unreachable-code
How Uber Deals with Unreachable Code Associated to Feature Flags in its Mobile Apps
https://www.infoq.com/news/2020/04/uber-piranha-unreachable-code/
探讨：https://dzone.com/articles/you-have-no-excuse-for-your-dead-code
Open source Tool to find unreachable/unused c# code [closed]
https://stackoverflow.com/questions/1706114/open-source-tool-to-find-unreachable-unused-c-sharp-code
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