reading material about 17.2 page395:

http://www.lua.org/pil/6.3.html proper tail call

17.3 goto:

http://coolshell.cn/articles/11112.html

18.2 page420, could refer to the project that Google open sourced.

https://developers.google.com/protocol-buffers/docs/tutorials

18.2 page420, F# pattern match

http://en.wikibooks.org/wiki/F_Sharp_Programming/Pattern_Matching_Basics

19.6 page458. refer to CodeMaid source code