@Override public void visitReturnStatement(@NotNull PsiReturnStatement statement) {
            final PsiExpression returnValue = statement.getReturnValue();
            if (returnValue != null && PsiTypes.booleanType().equals(returnValue.getType())) {
              elementsToInvert.add(returnValue);
            }
          }
@Override public void visitReturnStatement(@NotNull PsiReturnStatement statement)