More Perl 6 changes from Perl 5

∘ operator adverbs
∘ operator overloading
∘ user-definable operators (from the full Unicode set)
∘ extensible grammar
∘ macros (written in Perl)
∘ hyperoperators (vector processing)
∘ reduction operators
∘ cross operators
  list comprehensions
  currying
  coroutines
  threading / concurrency

     ∘ Rakudo: most of these awaiting parser improvements