https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93440
--- Comment #4 from ikonomisma at googlemail dot com --- I can reproduce this on both x86_64 and AArch64 Ubuntu 19.10. According to an answer to my question on stack overflow (https://stackoverflow.com/a/59995702/3185968), using std::transform without an execution policy requires a recent libstdc++ (https://github.com/gcc-mirror/gcc/commit/b93041f0d3c9a2fc64f0f5fb538e78d5e2001d32). The issue is reproducible on godbolt.org: https://godbolt.org/z/fZdAqp
