I knew that Lisp does this operator first thing, it's everything around this that I'm not familiar with. What does ; do? Is the => an arrow or greater than or equal to? What is t? Do I guess correctly that most-negative-fixnum is like INT_MIN?
The semicolon is Lisp syntax for comments. T is the way you write true in Lisp. Most-negative-fixnum is the most negative number Lisp can represent without promotion to bignum (so it can be int_min if int is roughly equivalent to size_t).
