jakubjelinek added a comment. While accepting all these inside of string and character literals in C and C++20 and older is fine, accepting them inside of identifiers can change meaning of valid programs. https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600620.html #define z(x) 0 #define a z( int x = a\N{LATIN SMALL LETTER U WITH DIAERESIS}); int y = a\u{1234}); int z = a\U{12345678});
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