[plt-scheme] v203.2

Matthew Flatt writes:
 >  * Added a syntax for listeral hash tables: #hash((<key> . <val>) ...)
 >    and #hasheq((<key> . <val>) ...). The former creates an immutable
 >    table with `equal?'-compared keys, the latter `eq?'-compared keys.
 >    Hash tables are printed using this notation when the new
 >    `print-hash-table' parameter is set to #t. The new
 >    `make-immutable-hash-table' procedure constructs an immutable table
 >    dynamically.

Excellent!  That'll save me the step of initializing a table from an
alist.  But, why are they immutable?  Literal vectors aren't immutable.

--dougo at ccs.neu.edu