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[plt-scheme] 207.2

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Thu Jul 22 10:21:39 EDT 2004		 
The exp-tagged code for in CVS for MzScheme and MrEd is now version 207.2.

This version adds two procedures:

 * `string-copy!', as in SRFI-13 (so the SRFI-13 module no longer
    exports `string-copy!').

 * `hash-table-count', which returns the number of keys mapped in a
    hash table.

    (`hash-table-count' is not in v299.11, but it will be added in
     v299.12.)

Matthew
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