declaration of inner function is already defined

[Andrey via Digitalmars-d-learn]

Hi,

Why this works:

void setBases(string type)(ref int data, string base, string[] syllables)

{

}

void setBases(string type, T)(ref int data, const ref T source)
{

}

void main()
{
    int q = 6;
    setBases!"tt"(q, "qwerty", ["tg", "jj"]);
    setBases!"tt"(q, q);
}

and this doesn't work:

void main()
{

void setBases(string type)(ref int data, string base, string[] syllables)

    {

    }

void setBases(string type, T)(ref int data, const ref T source)

    {

    }

    int q = 6;
    setBases!"tt"(q, "qwerty", ["tg", "jj"]);
    setBases!"tt"(q, q);
}

The error is:

declaration setBases(string type, T)(ref int data, ref const T source) is already defined

?