fe: A tiny, embeddable language implemented in ANSI C

When I see amazingly compact language implementations like this, the effect on me is not 'I want to use this language' but rather 'I should also write my own LISP'.

Cool! Something I wish project docs would always include is …why… and what. Why does fe exist? Why did the orignal author spend a span of 6mo on it? What can it do and what can't it do? Don't make people read between the lines. It can be just to learn and have fun! But please don't make me read between the lines. The overview is interesting: * Supports numbers, symbols, strings, pairs, lambdas, macros * Lexically scoped variables, closures…

I like lisp. :-) But your GC mark (fe_mark) is recursive => it's not embeddable. You need to take care to have O(1) stack for the whole system. All functions: no recursion. The gcstack may grow, obviously, no problem, but the system stack must be O(1), because you cannot dynamically grow it in embedded systems. And this includes GC mark. This is the typical problem, so I looked there first. ulisp (lispbadge) has the same problem... You can make the…