How do I access a pointer in struct template C++

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C++

templates

struct

I got the next template:

template <typename T>
struct List {
	struct node {
		T key;
		node* prev;
		node* next;
	};
	node* first = nullptr;
	node* last = nullptr;
	// functions
};

Using an outside function I need to compare 2 Lists, but the node pointer List<t>::node* its not declared right, even though the compiller tells me thats the right path. Why doesnt it work?

What I have tried:

template <typename T> bool compare(List<T> L1, List<T> L2)
{
	if (L1.size() == L2.size())
	{
		List<T>::node* currentL1 = L1.first; //error
		List<T>::node* currentL2 = L2.first; //error
		while (currentL1)
			if (currentL1->key != currentL2->key)
				return 0;
			else
			{
				currentL1 = currentL1->next;
				currentL2 = currentL2->next;
			}
	}
	else
		return 0;
	return 1;
}