v/vlib/v/checker/tests/struct_required_fn_field.vv

struct Abc {
	f1 int [required]
	f2 int
	f3 fn () [attr1; required; attr2]
}

fn main() {
	_ = Abc{
		f1: 123
		f3: fn () {}
	}
	_ = Abc{
		f1: 123
		f2: 789
	}
}