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> But I'm feeling 98% sure "in nil do ... end" never will become valid Lua.

It is valid in 5.2 and it forces (at runtime) that the block does not
contain any references to global variables.

   Lua 5.2.0 (work1)  Copyright (C) 1994-2008, PUC-Rio
   > in nil do a=1 end
   stdin:1: attempt to index local '(environment)' (a nil value)