jshell tool: what should the interactive output look like?

[Dan Smith]

> On Jan 25, 2016, at 10:20 AM, Dan Smith <daniel.smith at oracle.com> wrote:
> 
>> COMPLEX EXPRESSION
>> 
>> -> Math.sqrt(Math.PI)
> 
> | 1.7724538509055159 => double $3

One other note about complex expressions (not strictly about formatting but about UX anyway): would it be possible to give these automatically-generated variables more Java-like names?  I think that would help a lot to make this feel less like a strange new language.  ('$exp3' rather than '$3', for example.)

—Dan