I had problems to understand what your goal is, this code already looks broken.

It's true that x has a double nature (repeat string vs repeat list) like .. depending on context (flip flop vs range)

But "combined assignments" like += only allow scalars on the LHS...

See perlop

> These combined assignment operators can only operate on scalars, whereas the ordinary assignment operator can assign to arrays, hashes, lists and even references.

update

Besides you don't need any assignment

print for @_ x 2 should already work perfectly.

update

correction print for (@_) x 2 should already work perfectly.

  DB<100> @_=1..3
 => (1, 2, 3)

  DB<101> print for @_ x 2
 => ""
33
  DB<102> print for (@_) x 2
 => ""
123123
[download]

from perlop

> In list context, if the left operand is enclosed in parentheses or is a list formed by qw/STRING/, it repeats the list.

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