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> `(exp) is equivalent to exp, but possibly optimized in an
> implementation-specific manner.

If you want to experiment with this, try my ltokenp [1], a token
processor for Lua. It'll probably be easier if the new syntax is
`f(...)`, because you can use f to decide what to do. But you'll have
to work at the token level, not at the syntactic level. See assert.lua
for an example.