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R4RS 4.1.5 (if <test> <consequent> <alternate>) ==> object
(if <test> <consequent>) ==> object
Syntax: <Test>, <consequent>, and <alternate> may be arbitrary
expressions.
Semantics: An IF expression is evaluated as follows: first, <test>
is evaluated. If it yields a true value (see section see section
6.1 Booleans), then <consequent> is evaluated and its value is
returned. Otherwise <alternate> is evaluated and its value is
returned. If <test> yields a false value and no <alternate> is
specified, then the result of the expression is unspecified.
(if (> 3 2) 'yes 'no) ==> yes
(if (> 2 3) 'yes 'no) ==> no
(if (> 3 2)
(- 3 2)
(+ 3 2)) ==> 1
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