[plt-scheme] port -> file/line/column ?

Hi Kirill!

After calling (port-count-lines! <port>)--following the opening of the port--
then port-next-location will return a list of line number, column number, 
and file pos.

Jim

> Is it possible to extract from a port some information about 
> current position and (in case of file-stream port) about corresponding
> file name?
> 
> In other words, I'm looking for some friends to 'file-position' which can 
> return 
> line, column and filename.

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