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From: "StevenSun2021 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99686] ICE when concepts on C++17 when providing both T&&
 and const T& specialization
Date: Sat, 20 Mar 2021 19:43:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99686

--- Comment #1 from Steven Sun <StevenSun2021 at hotmail dot com> ---
The compiler args are only "g++ -fconcepts -std=3Dc++17"

It should choose the full specialization func(int &&), while the compiler
aborts during the instatiation of the partial specialization (using concept=
s).

If either the partial or the full specialzation is removed, it compiles.


New online compiler link: https://godbolt.org/z/fK5G61
-------------------------------------------------------------------------
template <typename T>
void func(T &&arg)
{
}

template <typename T>
requires requires(T t) { ++t; }
void func(T &&arg)
{
}

template <>
void func(int &&arg)
{
}

int main()
{
    func(1); // I am expecting func(int&&)
}
-------------------------------------------------------------------------

Error:
In instantiation of =E2=80=98void func(T&&) [with T =3D int]=E2=80=99:
internal compiler error: Segmentation fault
   11 | }
      | ^
Please submit a full bug report,=