[Bug c++/86429] [8/9 Regression] lambda capture breaks constexpr-ness

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86429

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Reduced:

struct A
{ 
  int i;
  constexpr int f(const int&) const { return i; }
};

void g()
{ 
  constexpr A a = { 42 };
  [&](auto x) {
    constexpr auto y = a.f(x);
  }(24);
}