How to test templates for equality?

[Uranuz via Digitalmars-d-learn]

I suddenly posted it for somehow. But I hope idea is clear. How 
could I test if symbol is equal to some concrete template. I 
tried these examples:

template isFoo(alias F)
{
     enum bool isFoo = is( F == Foo );
}

template isFoo(alias F)
{
     enum bool isFoo = F == Foo;
}

Could you advise something to solve this?