// Vectors

struct vec2:
	x : f32
	y : f32

func add(a : vec2, b : vec2) -> vec2:
	return vec2(a.x + b.x, a.y + b.y)

mut v = add(vec2(1.0, 2.0), vec2(3.0, 4.0))
v.x = -v.x
v.y = -v.y

// Factorial

func factorial(n : u32) -> u32:
	if n == 0u:
		return 1u
	return n * factorial(n - 1u)

let factorial10 = factorial(10u)

// Fibonacci
func fib(n : u32) -> u32:
	// Slow implementation with
	// exponentially-growing recursion tree
	if n == 0u | n == 1u:
		return n // base case
	return fib(n - 1u) + fib(n - 2u)

let fib10 = fib(10u)


func h() -> u32:
	return 0u

func f() -> u32:
	return h()

func g() -> u32:
	func h() -> u32:
		return 1u
	return f()

// Should equal 0u, but equals 1u due to an error in
// how the interpreter resolves functions & variables
let x = g()