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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/78754] incorrectly accepts non-deductible template
 parameter pack in function template
Date: Tue, 10 Aug 2021 04:11:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D78754

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
clang, ICC and GCC all accept it.  ICC warns though:
<source>(4): warning #2922: template parameter "Ts" cannot be used because =
it
follows a parameter pack and cannot be deduced from the parameters of funct=
ion
template "foo"
    template<std::size_t ...Ns, typename ...Ts>
                                            ^


And MSVC errors out:
<source>(5): error C3547: template parameter 'Ts' cannot be used because it
follows a template parameter pack and cannot be deduced from the function
parameters of 'foo'=