Common things that are known to have problems or not work in Rakudo
(As of 2009-01-10.)
Where appropriate, provide a reference to the corresponding RT ticket. Note that we aren't trying to make a list of all known bugs -- that's what RT is for. This should just be for the common issues that people will want to be aware of or work around when playing with Rakudo.
reading array/hash elements causes them to autovivify (RT #61882)
incorrect parsing of blocks followed by 'if', 'unless', 'while', 'until', 'given', etc. (RT #57876)