How can I distinguish an enum constant from an actual enum at compile time?

[TheFlyingFiddle via Digitalmars-d-learn]

I want to be able to do something like this:

enum a = 32
enum b = { q,w,e,r,t,y }

CtType ctype  = getCtType!(a); // -> Would become 
CtType.enumConstant
CtType ctype1 = getCtType!(b); // -> Would become CtType.enum_