https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63362
--- Comment #25 from Jason Merrill <jason at gcc dot gnu.org> ---
And the ICE reduces to
struct A {
A(...);
};
int main()
{
volatile A a;
volatile A a2(a);
}
which crashes from infinite recursion trying to copy a for passing to .... So,
not an __is_trivially_constructible issue.
