constexpr memeber function not constexpt anymore in v10

Klaus Doldinger
Wed Feb 19 08:01:00 GMT 2020

The following was possible in v9:

template<auto N>
struct A {
    constexpr auto size() const {
        return N;

template<typename A>
void foo(const A& a) {
    constexpr auto s = a.size();

int main() {
    A<10> x1;

In v10 this is rejected.

Looks like a bug?

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