Is it possible to do this with a template?

[rempas]

I want to use an expression and put it in place inside the `if` 
parentheses. The expression is: `is(typeof(val) == type)`. I want 
to use a template called "is_same" that will take the value and a 
type to place them to the respective places. I have tried the 
following but it doesn't seem to work:

```
mixin template is_same(val, type) {
   is(typeof(val) == type)
}

void main() {
   int val = 10;
   static if (is_same!(val, int)) {}
}
```

When trying to compile, I'm taking the following error message:

```
Error: declaration expected, not `is`
```

Is this a limitation of templates in D or is there a way to 
bypass this?