Perl 6
rakudo feature status: Revision 4

Common things that are known to have problems or not work in Rakudo as of 2009-01-02.
(Where appropriate, provide a reference to the corresponding RT ticket.)

  • arrays in list declarations -- e.g., my ($b, @a) = ...
  • arrays and hashes as parameters in methods/subs
  • reading array/hash elements causes them to autovivify (RT #61882)
  • incorrect parsing of blocks followed by 'if', 'unless', 'while', 'until', 'given', etc. (RT #57876)
  • accessing outer lexicals from eval
  • lazy lists
  • lazy ranges
  • prefix and postfix hyperoperators
  • //= (RT #61880)
  • operator overloading, defining new operators
  • nested package/grammar/class declarations
  • autothreading of methods over Junctions
  • slices/indexing of Ranges (RT #61848)
  • filling positional parameters by named argument (RT #54808)
  • assigning values to %*ENV (RT #57400)
  • methods on Match cannot be used as rule names (RT #57864)
  • some things that should be readonly aren't
  • autovivification of undefs to arrays/hashes

Things that do (mostly?) work in Rakudo:

  • scalar, array, hash variables
  • selected infix hyperoperators, reduction operators, cross operators
  • slicing syntax
  • whatever star in slices
  • closures
  • currying (i.e., .assuming)
  • simple next/last/redo

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