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    Subjectmacros: "do-while" versus "({ })" and a compile-time error

    just to stir the pot a bit regarding the discussion of the two
    different ways to define macros, i've just noticed that the "({ })"
    notation is not universally acceptable. i've seen examples where
    using that notation causes gcc to produce:

    error: braced-group within expression allowed only inside a function

    i wasn't aware that there were limits on this notation. can someone
    clarify this? under what circumstances *can't* you use that notation?
    thanks.

    rday
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