README: Document some known limitations.
None of these are fundamental---just a few things that haven't been implemented yet.
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@@ -12,3 +12,15 @@ preprocessors". To fill in these details, I've been using the C99
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standard (for which I had a convenient copy) as available from:
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http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1124.pdf
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Known limitations
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-----------------
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Macro invocations cannot include embedded newlines.
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The __LINE__, __FILE__, and __VERSION__ macros are not yet supported.
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The argument of the 'defined' operator cannot yet include enclosing
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parentheses.
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The #error, #pragma, #extension, #version, and #line macros are not
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yet supported.
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