>>> FOR NOW, THIS IS AN EXPERIMENTAL TOY <<<
    > Everything is subject to change. <

Write a dynamically typed Honu program as

 #honu dynamic

 <defn-or-provide>
 ...

The syntax of a definition is much like Java, and type positions in
Java are roughly contract positions in dynamic Honu.

The only supported base "types" right now are

    int     - exact integer
    obj     - anything
    string  - character string

and the only "type constructor" is

    (_ -> _)

where "_" is to be replaced with a "type". [Ok, "->" is not very Java
like...]

Every declaration must have a value, like this:

  #honu dynamic

  int v = 10;

  int f(int x) {
    return x + 1;
  }

  (int -> int) g() {
    return f;
  }

  provide f, g;

The "return" keyword is optional, but allowed only for expressions in
tail position.

Assignment: =
Operators: + - * / %
Functions: stringToNumber numberToString