- rust: - define/set! support (at the REPL?) - refactor out lifetime specifiers - add file input support (eg, comments in parser, multi-line, tty detect) - multi-part lambdas - begin (?) - map, filter - add numerical comparisons (>, >=) - basic testing - pseudo unittest; makefile? - find r7rs-small; try a full/compliant implementation in scheme/python? eg, macros - define a larger sub-set with let, letrc, etc - include a parser - should be able to run minimal.scm - of interest: julia c javascript haskell go