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#include <iostream>
using namespace std;
 
struct Foo {
	int member;
	Foo() = default;
};
 
int main() {
	const Foo foo;
 
	cout << foo.member << endl;
}

prog.cpp: In function ‘int main()’:
prog.cpp:10:12: error: uninitialized const ‘foo’ [-fpermissive]
  const Foo foo;
            ^~~
prog.cpp:4:8: note: ‘const struct Foo’ has no user-provided default constructor
 struct Foo {
        ^~~
prog.cpp:6:2: note: constructor is not user-provided because it is explicitly defaulted in the class body
  Foo() = default;
  ^~~
prog.cpp:5:6: note: and the implicitly-defined constructor does not initialize ‘int Foo::member’
  int member;
      ^~~~~~

Standard output is empty