(r5rs.info.gz) Whitespace and comments

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 2.2 Whitespace and comments
 ===========================
 
 "Whitespace" characters are spaces and newlines.  (Implementations
 typically provide additional whitespace characters such as tab or page
 break.)  Whitespace is used for improved readability and as necessary
 to separate tokens from each other, a token being an indivisible
 lexical unit such as an identifier or number, but is otherwise
 insignificant.  Whitespace may occur between any two tokens, but not
 within a token.  Whitespace may also occur inside a string, where it is
 significant.
 
 A semicolon (;) indicates the start of a comment.  The comment
 continues to the end of the line on which the semicolon appears.
 Comments are invisible to Scheme, but the end of the line is visible as
 whitespace.  This prevents a comment from appearing in the middle of an
 identifier or number.
 
 
      ;;; The FACT procedure computes the factorial
      ;;; of a non-negative integer.
      (define fact
        (lambda (n)
          (if (= n 0)
              1        ;Base case: return 1
              (* n (fact (- n 1))))))
 

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