Use function statements instead of function expressions.

[creationix]

[creationix]

This will need a modification to the syntax.

Before, you created a function with:

vars add
add = { a, b | a + b }

After you do it with this maybe?

def add(a, b) { a + b }

This statement is not an expression. It's defined for the entire body of the scope as if it's hoisted to the first line.