[plt-scheme] bitwise operations on scheme/foreign _bitmask

From: Anye Li (li.anye.0 at gmail.com)
Date: Sat Nov 14 17:21:43 EST 2009

Using the _bitmask type provided by the scheme/foreign module, is
there a simple and efficient way of doing bitwise manipulations, e.g.
turn off a particular set of bits from an existing set of bits?

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