* doc/invoke.texi: Document -std=c++17 and -std=gnu++17 and document

[official-gcc.git] / gcc / testsuite / g++.dg / concepts / intro5.C

// { dg-options "-std=c++17 -fconcepts" }

template<typename T, typename U = int>
  concept bool C()
  {
     return sizeof(U) == sizeof(int);
  }

C{A} void f1() {}

int main()
{
  f1<char>();
  return 0;
}