This is a simple experiment in writing a programming language using go. It's not meant to be practical, just to play with some ideas I have.

The goal is a dynamically typed test-oriented language:

var square = fn(x) {
	return x*x
}
square.before = Test(x) {
	if !isInt(x) {
		fail("x must be an integer")
	}
}
square.after = Test(x2) {
	var x = square.inputs[0]
	if x*x != x2 {
		fail("x*x != square(x)! x=${0}, square(x)=${1}", x, x2)
	}
}

However everything is in flux right now as I'm just setting up a simple interpreter.