[Bug c++/85743] Cannot call template member function inside a variadic lambda unless specifying `this`

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85743

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org
   Target Milestone|---                         |9.0

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced to remove library dependencies and make it valid as C++14 too:

template<typename... Ts>
struct Foo {
  template<typename T, typename...>
    constexpr int boom(int i) const { return 0; }

  constexpr void foo(int* data) const {
    [this, &data](auto... s) {
      int sink[] { boom<Ts>(data[s]) ... };
    }(1, 2, 3);
  }
};

int main() {
  Foo<int, float, char> f;
  int a[]{0, 1, 2};
  f.foo(a);
}


I don't think it was intentional that r265734 fixed this (Marek?), so we should
probably add the testcase before we close it.