Extended characters in identifiers may now be specified directly in the input encoding (UTF-8, by default), in addition to the UCN syntax (\uNNNN or \UNNNNNNNN) that is already supported:

    static const int π = 3;
    int get_naïve_pi() {
        return π;
    }

I see large potential for the IOCCC

GCC 10.1 is billed as a major release but apparently GNU hasn't published a release note -- I only see a list of regressions that were fixed in 10.1. Does that mean 10.1 is really a bug fix release with no new features? Just asking.