Template for function or delegate (nothing else)

[useo]

I implemented all I wanted and it works perfectly ;).

But I'm using the "if (is(T == delegate) || is(T == function))"-
statement in another class/template.

class Example(T) if (is(T == delegate) || is(T == function)) {
...
}

Now, when I declare Example!(void function()) myVar; I always get:

Error: template instance Example!(void function()) does not match
template declaration Example(T) if (is(T == delegate) || is(T ==
function))
Error: Example!(void function()) is used as a type

When I declare myVar as Example!(function), I get some other errors.

What's wrong with my code?