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> Checking my other pet-peeve I noticed that it's still there:
>   print("%d":format(42))    --> error: ')' expected near ':'
>   print(("%d"):format(42))  --> 42
> I still have to add these superfluous parentheses around the string.
> As far as I can see, there's no real reason for the parentheses.
> I've attached a patch to remove this requirement (patch1).

Please, do not send patches; they show the implementation, not the idea.
For what you are proposing, a BNF would be more useful. Show how Lua's
BNF should be modified.

-- Roberto