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* nullptr: work around Apple clang 14 issuePaul Eggert2023-02-091-10/+20
* nullptr: test for compilers at autoconf-timePaul Eggert2023-02-071-9/+19
* nullptr: test for C++ nullptr at configure-timePaul Eggert2023-02-071-24/+24
* nullptr: rename from c-nullptrPaul Eggert2023-02-071-0/+42