Taming templates and mixin magic: type inpector helper in D/Phobos?

As a newbie in D (and making a lots of mistakes), I've found myself relying heavily in the use of a rudimentary type inspector to visualize my templated code instantiations. It's simple and incomplete as hell but good enough to see what happens under the hood quickly. QUESTION: Is there a

is this even possible? newbie + mixin template + foreach (allMembers)

QUESTION: Obviously I'm no geting mixins/templates nor traits and I'm failing miserably to find/identify the right examples or documentation to help me tackle this thing. What is wrong in this code? is this pattern sintactically possible? what I'm getting wrong? CONTEXT: I'm a newbie