So, User-Defined Attributes

[Walter Bright]

On 1/4/2013 9:48 AM, Max Samukha wrote:
> It looks we simply cannot modify existing declarations with UDAs.
>
> @(attr) alias foo = bar; // @(attr) is ignored.

alias provides a way to provide an alternate name for a symbol. It wouldn't be 
an alternate name if it had different attributes. Trying to make such work would 
have serious semantic consequences.

Hence, no, you cannot use alias to modify the attributes.