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The following testcase is incorrectly rejected, because since r15-6744 it adds build_nop to preserve the exact typedef type and cxx_eval_constant_expression can't fold NOP_EXPR from integer_zerop of one NULLPTR_TYPE to another NULLPTR_TYPE, while cxx_eval_constant_expression relies on fold to do such folding. I see 3 options to fix that, one is deal with this in the r15-6744 spot and special case NULLPTR_TYPE there and build_zero_cst instead of build_nop (with similar condition like in the patch below), another possibility is special case this in cxx_eval_constant_expression, and another one (done in this patch) is to handle this in fold-const.cc - fold_convert_loc and also in fold_convert_const. 2026-01-30 Jakub Jelinek <jakub@redhat.com> PR c++/123790 * fold-const.cc (fold_convert_const): Handle conversion of integer_zerop to NULLPTR_TYPE. (fold_convert_loc): Likewise. * g++.dg/cpp0x/nullptr47.C: New test.
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