possible gdb agent expression extension

[Eli Zaretskii]

> Date: Mon, 25 Aug 2014 12:30:02 -0400
> From: David Taylor <dtaylor@emc.com>
> 
>     end (0x27) : ==>
> 
> it means that inputs -- if any -- are consumed; nothing is pushed on the
> stack.

Then please use

      end (0x27) : ==> (nothing)

to make that explicit.