request switch statement with common block

[monarch_dodra]

On Saturday, 3 August 2013 at 20:38:37 UTC, bearophile wrote:
> Regarding the feature proposed here, I think the extra 
> complexity added doesn't pay enough back.
>
>
> Walter Bright:
>
>> You could provide supporting evidence by examining every use 
>> of switch in the dmd, phobos, and druntime source code, and 
>> see what percentage of those would benefit from your proposal.
>
> Has someone done that regarding the last feature added to D, I 
> mean the support for this syntax:
>
> enum mysize(T) = T.sizeof;
> template Pair(T) = Tuple(T, T);
>
> Bye,
> bearophile

You pique my interest. What is this? Looks like template 
shorthand? I didn't find nything about it in docs. Could you 
share some links about this?