Question (mistake?) in S06 "Multidimensional argument list binding"

The section contrasts 
    sub foo (*@@slice) { ... }
    sub foo (\$slice) { ... }

but he latter is never explained anywhere.  Did you mean to use | instead of \ in that section?

If not, what am I missing?

• Question (mistake?) in S06 "Multidimensional argument list binding" by John M. Dlugosz