Gertie: a Lisp interpreter

This is a Lisp interpreter I developed over the course of a few weeks in 2014, as a learning exercise. You probably don't want to use it for anything - it is very much a product of a beginner.

The language itself is broadly Scheme-like, but not very well developed. The type system is rudimentary, and the macros are extremely unhygienic. I got bored before implementing call/cc, but all of the framework for it is there.

Some features:

• Basic lispish syntax (lambda, let, define, if, etc)
• A slightly janky macro system
• More sophisticated syntax (let*, cond, etc) defined through macros
• A mostly bootstrapped standard library
• A mark-and-sweep garbage collector
• A terrible hand-written lexer/parser