[Bug c++/89420] [9 Regression] ICE: unexpected expression 'int()' of kind cast_expr

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89420

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And another:

template<typename>
struct S {
    explicit(int{1}) S(int, int);
};