It's consistent with the documentation, which says a VAR is expected (with an optional my). $y[0] is an expression, not a variable. I suppose it could be considered a limitation, but not a bug.

The following can be used. If you want to next an arbitrary number of loops, check out Algorithm::Loops.

foreach $y0 (@x) {
  foreach $y1 (@x) { 
    do_something($y0, $y1);
  }
}

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In reply to Re: array element as foreach iterator by ikegami
in thread array element as foreach iterator by kingm61

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