[libc++] `<random>`: `piecewise_linear_distribution(InputIteratorB, InputIteratorB, InputIteratorW)` invokes comma operator

[hewillk]

#include <random>

struct I {
  using iterator_category = std::input_iterator_tag;
  using value_type = double;
  using difference_type = std::ptrdiff_t;
  using pointer = double*;
  using reference = double&;
  reference operator*() const;
  pointer operator->() const;
  I& operator++();
  I operator++(int);
  bool operator==(const I&) const;
};

void operator,(auto, I) = delete;

int main() {
  std::piecewise_linear_distribution<double> dist(I{}, I{}, I{});
}

https://godbolt.org/z/655T36eh5

[frederick-vs-ja]

https://github.com/llvm/llvm-project/actions/runs/18070257997/job/51419054186 showed that more components are problematic.