funct 0.1.0

A small, functional, embeddable scripting language with a fully reified bytecode VM you can pause, snapshot, and resume.
Documentation 
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// a funct module — only exported items are importable

type Shape = Circle { radius: Float } | Square { side: Float }

export fn circle(radius) = Circle { radius }
export fn square(side) = Square { side }

export fn area(s) = match s {
    Circle { radius } => pi() * radius * radius,
    Square { side } => side * side,
}

// module-private: not importable
fn pi() = 3.14159

// Tests live right next to the code (run: funct test examples/geometry.ft).
// They're ordinary functions otherwise — importing this module never runs them.

#[test]
fn square_area_is_side_squared() {
    assert_eq(area(square(3.0)), 9.0)
}

#[test]
fn circle_area_is_pi_r_squared() {
    let a = area(circle(2.0))
    assert(abs(a - 12.56636) < 0.001, "expected ~4pi, got ${a}")
}