array depth template

[Saaa]

>
> template BaseType(T: T[]) { const BaseType = BaseType!(T); }
> template BaseType(T) {const BaseType = T; }

..
else static if( std2.traits.isNumeric!( BaseType!(T) ) )
{
..

ddata\ddata.d(192): template instance isNumeric!(int) does not match any 
template declaration
ddata\ddata.d(192): Error: expression isNumeric!(int) is not constant or 
does not evaluate to a bool

What am I doing wrong?