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

From: Kirill Lisovsky (lisovsky at acm.org)
Date: Mon Oct 7 05:51:08 EDT 2002		 
Hello!

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.

Best regards,
         Kirill.
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