Kit allocator example

test.kit

import kit.mem;

struct MyStruct {
    public var x: Int;
    public var y: Int;

    public static function new(allocator: Box[Allocator]): Ptr[MyStruct] {
        var newValue: Ptr[MyStruct] = allocator.alloc(sizeof MyStruct);
        newValue.x = 1;
        newValue.y = 2;
        return newValue;
    }
}

function main() {
    // this will allocate a new struct via malloc
    var a = MyStruct.new();
    printf("%i %i\n", a.x, a.y);
    free(a);

    // this will allocate a new struct from a custom stack allocator
    var myStack = StackAllocator.new(sizeof MyStruct * 4);
    using implicit myStack as Box[Allocator] {
        var b = MyStruct.new();
        printf("%i %i\n", b.x, b.y);
        myStack.free(b);
    }
}