alias this

[Steven Schveighoffer]

On Thu, 30 Aug 2012 07:48:54 -0400, Carl Sturtivant <sturtivant at gmail.com>
wrote:

>
> Subtyping with 'alias this' is superb and easy; it's a tremendous  
> simplifying mechanism, one of D's many ingenious and well integrated  
> technical simplifying mechanisms that were a big part of getting me on  
> board, spreading the word and moving to D. What is the design logic  
> behind
>
> 364.d(9): Error: alias this compileme364.number.__anonymous there can be  
> only one alias this
>
> --- not a complaint, I'd just like to hear opinion of the basis of the  
> above restriction from experts.

This is a limitation in implementation.  According to TDPL, there will be
multiple alias this allowed in the final implementation.

See this bug: http://d.puremagic.com/issues/show_bug.cgi?id=6083

-Steve