File: 84601.cc

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gcc-arm-none-eabi 15%3A8-2019-q3-1
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// { dg-options "-std=gnu++17" }
// { dg-do compile }

#include <optional>

using pair_t = std::pair<int, int>;
using opt_t = std::optional<pair_t>;

static_assert(std::is_copy_constructible_v<opt_t::value_type>);
static_assert(std::is_copy_assignable_v<opt_t::value_type>);

static_assert(std::is_copy_assignable_v<opt_t>); // assertion fails.

class A
{
  void f(const opt_t& opt)
  {
    _opt = opt;
  }

  opt_t _opt;
};