Pythonification of the asterisk-based collection packing/unpacking syntax

[Eelco]

On Dec 21, 4:48 pm, Neal Becker <ndbeck... at gmail.com> wrote:
> Clarification: where can packing/unpacking syntax be used?
>
> It would be great if it were valid essentially anywhere (not limited to
> parameter passing).
>
> What about constructs like:
>
> a, @tuple tail, b = sequence?

This has come up many times in the thread, including in my OP. More
closely unifying collection packing/unpacking is part of my goal, so
indeed, I would like to be able to write something like:

a, middle::tuple, b = ::sequence

Where I would like the extra :: before the sequence to explicitly
signal collection unpacking on the rhs, to maintain the symmetry with
collection unpacking within a function call.