static CallHandler<CallChainSimplification> handler() {
      return CallHandler.of(INT_STREAM_MAP, call -> {
        PsiExpression mapper = call.getArgumentList().getExpressions()[0];
        LimitedContainer limitedContainer = extractContainer(getQualifierMethodCall(call), mapper);
        if (limitedContainer == null) return null;
        return new ReplaceWithElementIterationFix(limitedContainer.myContainer, call.getMethodExpression().getReferenceName());
      });
    }
static CallHandler<CallChainSimplification> handler()