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== Module (scheme case-lambda)

<macro>(case-lambda <clause> ...)</macro>

Syntax: Each <clause> is of the form (<formals> <body>), where <formals> and
<body> have the same syntax as in a lambda expression.

Semantics: A case-lambda expression evaluates to a procedure that accepts a
variable number of arguments and is lexically scoped in the same manner as a
procedure resulting from a lambda expression. When the procedure is called, the
first <clause> for which the arguments agree with <formals> is selected, where
agreement is specified as for the <formals> of a lambda expression. The
variables of <formals> are bound to fresh locations, the values of the
arguments are stored in those locations, the <body> is evaluated in the
extended environment, and the results of <body> are returned as the results of
the procedure call.

It is an error for the arguments not to agree with the <formals> of any
<clause>.

(define range
   (case-lambda
    ((e) (range 0 e))
    ((b e) (do ((r '() (cons e r))
                (e (- e 1) (- e 1)))
               ((< e b) r)))))
 
 (range 3)     ==> (0 1 2)
 (range 3 5)   ==> (3 4)

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