gcc/testsuite/g++.dg/cpp1z/lambda-this6.C - gcc - Git at Google

 // { dg-do compile { target c++17 } }

 struct S
 {
   int a = [this] { return 6; } ();
 };

 S
 foo()
 {
   return {};
 }
	// { dg-do compile { target c++17 } }

	struct S
	{
	int a = [this] { return 6; } ();
	};

	S
	foo()
	{
	return {};
	}