correct way to create boiler plate code

[Trass3r]

> string[] funcs = ["tan"];

> calling mixin a compile time has the following error...
>
> Error	1	Error: variable func cannot be read at compile time
> 	C:\D\SVNProjects\trunk\xcellD\xcell1\trig.d	22

That's because funcs is mutable.
Try to make it immutable or enum.