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/**

* @name Testing equality to None

* @description Testing whether an object is 'None' using the == operator is inefficient and potentially incorrect.

* @kind problem

* @tags quality

* reliability

* correctness

* performance

* @problem.severity recommendation

* @sub-severity high

* @precision very-high

* @id py/test-equals-none

import python

from Compare c

where c.getOp(0) instanceof Eq and c.getAComparator() instanceof None

select c, "Testing for None should use the 'is' operator."