[plt-scheme] Immutable mappings on symbols

From: Carl Eastlund (carl.eastlund at gmail.com)
Date: Thu Jan 20 18:19:39 EST 2005

I would like to see predicates like set?, map?, and (map-of thing?)
exported from the galore units.  It would be nice to be able to check
that, or to put contracts on modules which use these datatypes.  If
these exist, I don't see them in the documentation.


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