What have you done with UDAs?

[Jonas Drewsen via Digitalmars-d]

On Monday, 22 June 2015 at 19:09:40 UTC, weaselcat wrote:
> I never seem to use them for anything, has anyone else done 
> anything interesting with them?

I use a few in the deadcode editor e.g.:

Function can be called by a menu entry:
@MenuItem("Edit/Copy")

Function can be called by a shortcut:
@Shortcut("<shift> + <f10>")

Function should run in a fiber when called:
@InFiber