On Fri, 20 May 2011, John Cowan wrote:

> Andre van Tonder scripsit:
>
>> Scheme has many generic procedures, such as port?, read, write,
>> display, cons, +, -, *, /, <, >, <=, >=, sin, etc.
>
> True that the math procedures are generic in the sense of
> representations, but they are not generic in the sense of handling
> something other than numbers.

And CLOSE-PORT would not be generic in the sense of handling
something other than ports.

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