Function sample1

sample/Wildcard-pattern.cpp:6–14

using namespace matchit;

void sample1()
{
  constexpr auto x = 20;
  Id<int32_t> a;
  match(10, x)(
      // the x is always matched by _
      pattern | ds(a, _) = [&]
      { assert(*a == 10); });
}

void sample2()
{