static if(!(is(Tr == Comparable)))
static if(!(is(Tr == Hashable)))
static if(!(is(Tr == Incrementable)))
static if(!(is(Tr == Decrementable)))
static if(!(is(Tr == Addable)))
static if(!(is(Tr == Subtractable)))
static if(!(is(Tr == Modulable)))
static if(is(Tr == Divisable))