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Another easy part from the paper. Part of the CWG2579 has been already done in an earlier paper (with test commits by Marek) and the remaining part is implemented correctly, we diagnose as error when token pasting doesn't form a valid token. Except that message pasting """" and """" does not give a valid preprocessing token looked weird and so I've updated the message to use %< and %> instead of \" quoting. 2025-08-05 Jakub Jelinek <jakub@redhat.com> PR preprocessor/120778 * macro.cc (paste_tokens): Use %< and %> instead of \" in diagnostics around %.*s. * g++.dg/DRs/dr2579.C: New test. * c-c++-common/cpp/va-opt-6.c: Expect ' rather than \" around tokens in incorrect pasting diagnostics. * gcc.dg/c23-attr-syntax-6.c: Likewise. * gcc.dg/cpp/paste12.c: Likewise. * gcc.dg/cpp/paste12-2.c: Likewise. * gcc.dg/cpp/paste14.c: Likewise. * gcc.dg/cpp/paste14-2.c: Likewise.