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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102338] Recursive noexcept specification inside class/struct
Date: Wed, 15 Sep 2021 07:46:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102338

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
here is a more reduced testcase:
struct S {
    template<typename T>
     int f(T && t) noexcept {
        return 0;
    }
    template<typename T, typename... Ts>
     int f(T && t, Ts && ... ts) noexcept(noexcept(f(ts...))) {
        return f(ts...);
    }
};

bool t =3D  S{}.f(true, 0, 5u);

If this was not a struct, the code would be invalid as the recusive f is not
found.=