---------------------------------------------

General:
    - add chat bot for #mal
    - move tokenizer.mal and reader.mal from malc along with
      ./examples/{equality,memoize,pprint,protocols}.mal and
      ./core.mal to ./lib directory

    - Finish guide.md

All Implementations:
    - regular expression matching in runtest
    - add re (use in rep) everywhere and use that (to avoid printing)
    - per impl tests for step5_tco, or at least a better way of
      enabling/disabling/tweaking per implementation
    - fix stepA soft failures: lua matlab miniMAL perl racket

Other ideas for All:
    - propagate/print errors when self-hosted
    - redefine (defmacro!) as (def! (macro*))
    - Fix/implement interop in more implementations

    - metadata on symbols (as per Clojure)
    - metadata as a map only. ^ merges metadata in the reader itself.
      Line numbers in metadata from reader.
    - protocols!
        - https://github.com/pixie-lang/pixie
        - http://www.toccata.io/2015/01/Mapping/
    - namespaces
        - environments first class: *ENV*, *outer* defined by env-new
        - namespaces is *namespaces* map in environment which maps namespace
          names to other environments.
        - def! become an alias for (env-set! *ENV* 'sym value)
        - Namespace lookup: go up the environment hierarchy until
          a *namespaces* map is found with the namespace name being
          looked up. Then the symbol would be looked up starting in
          the namespace environment. Need protocols first probably.

    - multi-line REPL read
    - loop/recur ?
    - gensym reader inside quasiquote
    - standalone executable


---------------------------------------------

Bash:
    - explore using ${!prefix*} syntax (more like make impl)
    - GC

C:
    - come up with better way to do 20 vararg code
    - GC: use http://www.hboehm.info/gc/

C#:
    - accumulates line breaks with mal/clojurewest2014.mal
    - interop: http://www.ckode.dk/programming/eval-in-c-yes-its-possible/

Clojure:
    - fix "\/" exception in mal/clojurewest2014.mal

CoffeeScript:
    - make target to compile to JS

Go:
    - consider variable arguments in places where it makes sense
        https://gobyexample.com/variadic-functions

Haskell:
    - TCO using seq/bang patterns:
      http://stackoverflow.com/questions/9149183/tail-optimization-guarantee-loop-encoding-in-haskell
    - immediately exits mal/clojurewest2014.mal ("\/" exception)

Java:
    - Use gradle instead of mvn
        http://blog.paralleluniverse.co/2014/05/01/modern-java/
    - MAL formatting is a bit off with mal/clojurewest2014.mal

Javascript:
    - interop: adopt techniques from miniMAL

Make:
    - allow '_' in make variable names
    - hash-map with space in key string
    - Fix: make -f stepA_mal.mk ../mal/step6_file.mal
        (slurp "../tests/incA.mal")
        (read-string "(+ 2 3)")
    - errors should propagate up from within load-file
    - GC: expore using "undefined" directive in Make 3.82

Mal:
    - line numbers in errors
    - step5_tco

MATLAB:
    - Port to support both GNU Octave and MATLAB

miniMAL:
    - figure out why {} literals are "static"/persistent

ObjPascal:
    - verify that GC/reference counting works
    - fix comment by itself error at REPL

Perl:
    - fix metadata on native functions
    - fix extra line breaks at REPL

Postscript:
    - add negative numbers
    - fix blank line after comments
    - fix command line arg processing (doesn't run file specified)

R:
    - tracebacks in errors
    - fix running from different directory

Racket
    - metadata on collections

Rust:
    - fix 'make all' invocation of cargo build

Scala
    - readline
    - fix exception when finished running something on command line