### SUMMARY
```
  sha256sum:
    description:
      - If a SHA-256 checksum is passed to this parameter, the digest of the
        destination file will be calculated after it is downloaded to ensure
        its integrity and verify that the transfer completed successfully.
        This option is deprecated. Use C(checksum) instead.
```

There is no `module.deprecate` either for `sha256sum`.

the argument has been declared deprecated in commit b3b11fbce26 (2017)

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
get_url

* ansible version: 2.10

- name: Download file with checksum url (sha256)
  get_url:
    url: http://example.com/path/file.conf
    dest: /etc/foo.conf
    checksum: sha256:http://example.com/path/sha256sum.txt
- name: Download file from a file path
  get_url:
    url: file:///tmp/afile.txt
    dest: /tmp/afilecopy.txt
- name: < Fetch file that requires authentication.
        username/password only available since 2.8, in older versions you need to use url_username/url_password
  get_url:
    url: http://example.com/path/file.conf
    dest: /etc/foo.conf
    username: bar
    password: '{{ mysecret }}'
'''
RETURN = r'''
backup_file:
    description: name of backup file created after download
    returned: changed and if backup=yes
    type: str
    sample: /path/to/file.txt.2015-02-12@22:09~
checksum_dest:
    description: sha1 checksum of the file after copy
    returned: success
    type: str
    sample: 6e642bb8dd5c2e027bf21dd923337cbb4214f827
checksum_src:
    description: sha1 checksum of the file