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S9 LIB (module <name> <definition> ...) ==> unspecific
(using <name> (<name_i> ...) <expression> ...) ==> object
(load-from-library "simple-modules.scm")
Simple modules. Inside of a MODULE expression, DEFINE defines
a local object and DEFINE* defines a public object. <Name> names
the module itself.
Expressions inside of USING may use all <name_i>'s that are
being imported from the module <name>.
(module math
(define* (fact x)
(if (= 0 x) 1 (* x (fact (- x 1))))))
(using math (fact)
(fact 5)) ==> 120
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