Return type of a function

Hi,

Consider the code below.

typedef double T;

class A{
public:
	typedef int T;
	T fn(T t);
};

T A::fn(T t){
	return T();
}

int main(){
	A a;
	a.fn(0);
}

This program is ill-formed, because the return type of the function
declaration A::fn is int, but when it is defined outside of the class
declaration, the type of return type is double.

However I am not clear on which section of the C++ standard talks
about this behaviour. Please guide me.

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