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    This is a great example of how being “clever” with macros in C can cause pain. The #x macro feature arguably breaks C since it allows tokens to be treated invisibly as a completely different kind of token.

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      In response to this, the macro was made less clever: https://pdfium.googlesource.com/pdfium/+/d539de991cacf02811880c434d4393c8275163d2