switch using a variable that can cast to both integer and string

[Peter Alexander]

On Wednesday, 26 September 2012 at 08:02:24 UTC, Jonathan M Davis 
wrote:
> I would expect it to give errors on those case statements, 
> because they're not
> actually ints or strings.

http://dlang.org/statement.html#SwitchStatement

"The case expressions must all evaluate to a constant value or 
array, or a runtime initialized const or immutable variable of 
integral type. They must be implicitly convertible to the type of 
the switch Expression."

In the example, the case expression evaluate to a constant value, 
and they are implicitly convertible via alias this.