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Back when I used to use C++ a lot, I came up with a creative abuse of comments to let me decide which of two sections to compile based on the presence of a single character. I just happened to come up with a similar construct in Lua as well, and I thought I'd share it. I don't know if anyone else has come up with it before - it /is/ really simple - but it occurred to me as I read the section on comments in the  "The Evolution of Lua" PDF.
--[[  print("one")--[=[ <Two-way comment> ]]  print("two")--]=]
This construct will only allow print("two") to be executed. By adding a - to the first comment, the structure 'toggles', and only print("one") executes. It also just so happens that you can disable both blocks at once by changing [[ to [=[. Lastly, no matter how it's toggled, the middle comment has a convenient space for a human-readable comment.
I'm not sure how useful this would be to anyone else, but I like to use constructs like this to preserve old code while I'm developing a newer block.
~Jonathan Castello 		 	   		  
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