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Reports bitwise mask expressions which are guaranteed to
evaluate to <b>true</b> or <b>false</b>.
Expressions checked are of the form <b><i>(var & constant1) == constant2</i></b> or
<b><i>(var | constant1) == constant2</i></b>, where <b><i>constant1</i></b>
and <b><i>constant2</i></b> are incompatible bitmask constants.
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