[rjbond3rd]

True, Perl 6 is an amazing fiasco! Every bad thing in software has happened, so it's the world's most sensational counter-example! Stay away! Hide your kids!

P.S. But from close-up, it's the think-tank and test-bed of potential Perl 5 upgrades. Even if Perl 6 never ships, it's contributed tons of shipping code for Perl 5. Yes, it's hard to understand that from a distance, and it's not a PR dream, but oh well.

[chromatic]

But from close-up, it's the think-tank and test-bed of potential Perl 5 upgrades.

I question this claim. Perhaps it's true of some syntactic features (`say` comes to mind as do some proposals for function signatures), but the semantics rarely translate over well (consider smartmatch). If you squint and tilt your head you can claim that Moose is an example of a feature designed in one language and implemented in another, but Moose is more an exercise in language/feature syncretism than it is porting something complete in implementation or design to Perl 5.