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Reserved identifiers in C

You aren't supposed to create identifiers that match these patterns, if you're trying to write portable, future-proof C code. But you probably are. We all are.

Because these rules aren't nice, and you won't be warned that you've broken one.

Is it worth it?

Adapted from open-std.org/jtc1/sc22/wg14/ww

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@cancel does GCC have any kind of strict checking that will warn you?
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