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Re^4: ref to read-only alias ... why? (not consistent)

by ikegami (Pope)
on Jan 06, 2012 at 18:33 UTC ( #946644=note: print w/ replies, xml ) Need Help??

in reply to Re^3: ref to read-only alias ... why? (not consistent)
in thread ref to read-only alias ... why?

Your right it's not consistent. But IMHO consistency will most likely break legacy code.

I think you're saying that because you envision it being consistently broken (always dying) instead of it being consistently fixed (never dying).

There are two ways of fixing it:

  • Have literal constants always return new values. That's inefficient.
  • Have literal constants return copy-on-write values. There's currently no such mechanism, and that's a lot of work to implement.

Check out this bug that would also be fixed by either of the above two fixes:

for (1..2) { for (1..3) { print $_++; } # 123 234 print "\n"; }

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