> ## Documentation Index
> Fetch the complete documentation index at: https://prod-mint.classiq.io/llms.txt
> Use this file to discover all available pages before exploring further.

# 0.40.0

## Upgrade Instructions

* [Python SDK](/getting-started/registration_installations#platform-version-updates)
* The IDE upgrades automatically.

## Interface Changes

1. The `control` and `quantum_if` statements have been unified into one
   statement in native Qmod and the SDK under the name `control`.
   * SDK: The unified `control` statement accepts a qbit (`q`), a q-array
     (`qbv`), or a comparison of a qnum and an integer (`n == 5`) as the
     first argument.
   * SDK: The old `control` syntax (with `ctrl` as the second argument) is
     deprecated and will be removed in the next release.
   * SDK: The `quantum_if` operator is deprecated and will be removed in the
     next release.
   * Native Qmod: `quantum_if` is no longer supported, use the new `control`
     statement instead.
2. SDK: The `QParam` and `Array` types are deprecated and will be
   removed in the next release.
   * Instead of `QParam[int]`, use `CInt`.
   * Instead of `QParam[float]`, use `CReal`.
   * Instead of `QParam[bool]`, use `CBool`.
   * Instead of `QParam[List[...]]`, use `CArray[...]`.
   * Instead of `QParam[Array[..., size]]`, use `CArray[..., size]`.
3. SDK: Using Python types (`int`, `bool`, etc.) in struct declarations
   (`@struct`) is deprecated and will not be supported by the next release.
   Instead, use classical data types (`CInt`, `CBool`, etc., see above).
4. Default timeout for sending jobs to AWS changed from 5 minutes to 4 hours.

## Deprecations

1. The error mitigation settings in the execution preferences are no longer
   available.
2. The `aer_simulator` backend has been removed. Use Classiq's simulator backend
   instead (`ClassiqSimulatorBackendNames.SIMULATOR`).

## Enhancements

1. Improved error messages.

## Bug fixes

1. Fixed a bug preventing execution of circuits synthesized with hardware aware synthesis on Azure and IonQ.