---
title: "Go, Backwards Compatibility, and GODEBUG"
layout: article
---

<!--
This document is kept in the Go repo, not x/website,
because it documents the full list of known GODEBUG settings,
which are tied to a specific release.
-->

## Introduction {#intro}

Go's emphasis on backwards compatibility is one of its key strengths.
There are, however, times when we cannot maintain complete compatibility.

                addViolation(
                        problems,
                        Severity.WARNING,
                        Version.V20,
                        prefix + "layout",
                        repository.getId(),
                        "uses the unsupported value 'legacy', artifact resolution might fail.",
                        repository);
            }
        }
    }

# Before VS 2017 15.8, the member "type" would non-conformingly have an
# alignment of only alignof(max_align_t). VS 2017 15.8 was fixed to handle this
# correctly, but the fix inherently changes layout and breaks binary
# compatibility (*only* for uses of aligned_storage with extended alignments).
common:windows --copt=-D_ENABLE_EXTENDED_ALIGNED_STORAGE
common:windows --host_copt=-D_ENABLE_EXTENDED_ALIGNED_STORAGE

          </description>
          <type>String</type>
        </field>
        <field>
          <name>layout</name>
          <version>4.0.0+</version>
          <description>
            The type of layout this repository uses for locating and storing artifacts -
            can be {@code legacy} or {@code default}.
          </description>
          <type>String</type>

    *   List of members of `dtensor.Layout` and `dtensor.Mesh` have slightly changed as part of efforts to consolidate the C++ and Python source code with pybind11. Most notably, `dtensor.Layout.serialized_string` is removed.
    *   Minor API changes to represent Single Device Layout for non-distributed Tensors inside DTensor functions. Runtime support will be added soon.

	<!-- ul below only for regular layout -->
	<ul> </ul>
</li>

<li>
	A call to the built-in function
	<a href="#Handling_panics"><code>panic</code></a>.
	<!-- ul below only for regular layout -->
	<ul> </ul>
</li>

<li>
	A <a href="#Blocks">block</a> in which the statement list ends in a terminating statement.
	<!-- ul below only for regular layout -->
	<ul> </ul>
</li>

<li>

{* ../../docs_src/security/tutorial003_an_py310.py hl[82:85] *}

#### About `**user_dict` { #about-user-dict }

`UserInDB(**user_dict)` means:

*Pass the keys and values of the `user_dict` directly as key-value arguments, equivalent to:*

```Python
UserInDB(

[alt_names]
IP.1 = 127.0.0.1
DNS.1 = localhost
```

Run `openssl` by specifying the configuration file and enter a passphrase if prompted:

```sh
openssl req -new -x509 -nodes -days 730 -keyout private.key -out public.crt -config openssl.conf
```

### 3.3 Use GnuTLS (for Windows) to Generate a Certificate

This section describes how to use GnuTLS on Windows to generate a certificate.

```sh
mc admin config set myminio/ notify_amqp:1 exchange="bucketevents" exchange_type="fanout" mandatory="off" no_wait="off"  url="amqp://myuser:mypassword@localhost:5672" auto_deleted="off" delivery_mode="0" durable="off" internal="off" routing_key="bucketlogs"
```

MinIO supports all the exchanges available in [RabbitMQ](https://www.rabbitmq.com/). For this setup, we are using `fanout` exchange.

                Read more about it in the
                [FastAPI docs about how to Generate Clients](https://fastapi.tiangolo.com/advanced/generate-clients/#custom-generate-unique-id-function).
                """
            ),
        ] = Default(generate_unique_id),
    ) -> None:
        """
        Include an `APIRouter` in the same app.

        Read more about it in the