Checklist for 2022.04

[JJ]

Original announcement

Additions:

• Make previous values in REPL accessible with $*N -190e303d-1292357d
• Add INSIDE_EMACS environment variable for better embedding of the REPL
  inside Emacs -76035de0
• Add an IO::Path.dir-with-entries method, returning a Bool indicating
  if the directory has any entries (without danger of resource leaking)
  -8a1e7788
• Implement will complain trait -a203a5af-2c2c5306-beeb9ffc-2baf8bc6

Removals:

• Remove the $?COMPILATION-ID constant as it was not documented and not
  tested -b2a8bfc9;

[coke]

(Compilation ID already not mentioned in docs)

[lizmat]

I don't think there's actually a section explaining the functionality and limitations of the REPL, is there?

[Altai-man]

No separate section for REPL, yes.