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 * @name `__iter__` method returns a non-iterator
 * @description The `__iter__` method returns a non-iterator which, if used in a 'for' loop, would raise a 'TypeError'.
 * @kind problem
 * @tags quality
 *       reliability
 *       correctness
 * @problem.severity error
 * @sub-severity low
 * @precision high
 * @id py/iter-returns-non-iterator
import python
private import LegacyPointsTo
from ClassValue iterable, FunctionValue iter, ClassValue iterator
  iter = iterable.lookup("__iter__") and
  iterator = iter.getAnInferredReturnType() and
  not iterator.isIterator()
select iterator,
  "Class " + iterator.getName() +
    " is returned as an iterator (by $@) but does not fully implement the iterator interface.",
  iter, iter.getName()

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IterReturnsNonIterator.ql

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IterReturnsNonIterator.ql

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