https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94831
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |rejects-valid --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- Here's a testcase that is definitely valid in C++17 and C++20, but fails with GCC 10: #include <memory> int main() { float i[2]; std::uninitialized_value_construct(&i, &i + 1); } The standard says this just uses a new-expression, but we have always implemented it by a call to _Construct, which now fails in GCC 10.