As the new-if is not a special form, scheme lang uses an applicative order evaluation when evaluating the function.
See the operands of the function:
(define (new-if <predicate> then-clause else-clause)
<body>)Predicate, then-clause and else-clause are all evaluated first before the new-if procedure is being evluated
Since our else-clause is a recursive call to itself, our new-if will cause an infinite recursion