[E-Lang] Immutable map operations

[Bill Frantz]

At 3:04 AM -0800 3/23/01, Tyler Close wrote:
>Dean wrote:
>> 		map withoutAll(keys)
>
>	map & ~map

The concept of ~map seems to mean, a map which has all the possible keys
that aren't in map.  As an abstraction tied tightly to & it makes a weird
kind of sense.  As a stand-alone operator the thought of implementation
makes me cringe.


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