Indeed, and that bugs is closed, so 6.0.11 won't parse it as = =. On the other hand, :==$x stays legal and is parsed as := =$x in the absense of an user-defined :== operator, which I think is correct -- let me know if it's not. :)

The for@l {...} form is indeed correctly parsed; no whitespace is needed before @.

Finally, thanks to this Golf-Driven Development, nothingmuch is now implementing reverse as we speak, so 6.0.11 should be happy with print reverse=<> -- note that I shaved the trailing semicolon. Yay!