v0.32

improved error reporting

v0.31

optimized destructuring_bind

v0.29

use C++17 variant

v0.28

to_string of cons bug (crash) fixed

v0.27

added memo, defmemo

v0.26.1

more pass by references, set err_expr only when necessary

v0.26

readline's handling of multiline input improved

v0.25: added dir-exists, file-exists, ensure-dir

see: http://arclanguage.github.io/ref/filesystem.html

v0.24.1

more constness

v0.24: = reworked using quasiquote. now supports caar, cadr, cddr.

example:
(= a '((1 2)))
(macex '(= (caar a) 3)) ; => (do (scar (car a) 3))
(= (caar a) 3)
a ; => ((3 2))