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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99833] [8/9/10/11 Regression] structured binding + if init
 + generic lambda = internal compiler error
Date: Wed, 31 Mar 2021 17:24:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99833

--- Comment #5 from Patrick Palka <ppalka at gcc dot gnu.org> ---
It looks like GCC 10.1 accepts this testcase, and 10.2, 10.3 and 11 reject.

The requires-expression is a red herring, we can trigger the ICE without it:

#include <tuple>
template<class> void f() {
  [] (auto x) {
    if constexpr (auto [a, b] =3D std::tuple{x, x}; sizeof(a) > 1)
      ;
  }(0);
}

template void f<int>();

The ICE for this one isn't a regression it seems.=