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>Of course, if GC time isn't an issue, you can just write:
>local C = [[
><syntaxly correct code to comment out>
>--]] ; C = nil
>and the string isn't in memory anymore (after the GC of course).

There's also

do local C=[[
--]] end

C goes immediately out of scope. The parser could exploit this (but doesn't).

There's also

local C= 1 or [[
<syntaxly correct code to comment out>

The code generator could exploit this (but doesn't).