DMD 1.031 and 2.015 releases

[Jason House]

Walter Bright wrote:

> Some new stuff to make writing templates easier.
> 
> http://www.digitalmars.com/d/1.0/changelog.html
> http://ftp.digitalmars.com/dmd.1.031.zip
> 
> http://www.digitalmars.com/d/2.0/changelog.html
> http://ftp.digitalmars.com/dmd.2.015.zip

Why is "alias" required when specifying a template parameter?  It seems like
the most accepting and general case.  Why wouldn't it be the default?