# Buggy code
def absent(name, runas=None, user=None):
    """
    Ensure that the named user is absent

    name
        The username of the user to remove

    runas
        System user all operations should be performed on behalf of

        .. deprecated:: 0.17.0

    user
        System user all operations should be performed on behalf of

        .. versionadded:: 0.17.0
    """
    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    salt.utils.warn_until(
        (0, 18),
        "Please remove 'runas' support at this stage. 'user' support was "
        "added in 0.17.0",
        _dont_call_warnings=True,
    )
    if runas:
        # Warn users about the deprecation
        ret.setdefault("warnings", []).append(
            "The 'runas' argument is being deprecated in favor or 'user', "
            "please update your state files."
        )
    if user is not None and runas is not None:
        # user wins over runas but let warn about the deprecation.
        ret.setdefault("warnings", []).append(
            "Passed both the 'runas' and 'user' arguments. Please don't. "
            "'runas' is being ignored in favor of 'user'."
        )
        runas = None
    elif runas is not None:
        # Support old runas usage
        user = runas
        runas = None

    # check if user exists and remove it
    if __salt__["postgres.user_exists"](name, runas=user):
        if __opts__["test"]:
            ret["result"] = None
            ret["comment"] = "User {0} is set to be removed".format(name)
            return ret
        if __salt__["postgres.user_remove"](name, runas=user):
            ret["comment"] = "User {0} has been removed".format(name)
            ret["changes"][name] = "Absent"
            return ret
        else:
            ret["result"] = False
            ret["comment"] = "User {0} failed to be removed".format(name)
            return ret
    else:
        ret["comment"] = "User {0} is not present, so it cannot be removed".format(name)

    return ret


# Traceback (AttributeError)
[ERROR   ] Error in function _master_opts:
Traceback (most recent call last):
File "/usr/lib/pymodules/python2.7/salt/master.py", line 1444, in run_func
ret = getattr(self, func)(load)
File "/usr/lib/pymodules/python2.7/salt/master.py", line 891, in _master_opts
envs = self._file_envs()
File "/usr/lib/pymodules/python2.7/salt/fileserver/__init__.py", line 153, in envs
ret.update(self.servers[fstr]())
File "/usr/lib/pymodules/python2.7/salt/fileserver/hgfs.py", line 176, in envs
tags = repo.get_tags()
AttributeError: 'hgclient' object has no attribute 'get_tags'

# Fixed code
def absent(name, runas=None, user=None):
    """
    Ensure that the named user is absent

    name
        The username of the user to remove

    runas
        System user all operations should be performed on behalf of

        .. deprecated:: 0.17.0

    user
        System user all operations should be performed on behalf of

        .. versionadded:: 0.17.0
    """
    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    salt.utils.warn_until(
        "Hydrogen",
        "Please remove 'runas' support at this stage. 'user' support was "
        "added in 0.17.0",
        _dont_call_warnings=True,
    )
    if runas:
        # Warn users about the deprecation
        ret.setdefault("warnings", []).append(
            "The 'runas' argument is being deprecated in favor or 'user', "
            "please update your state files."
        )
    if user is not None and runas is not None:
        # user wins over runas but let warn about the deprecation.
        ret.setdefault("warnings", []).append(
            "Passed both the 'runas' and 'user' arguments. Please don't. "
            "'runas' is being ignored in favor of 'user'."
        )
        runas = None
    elif runas is not None:
        # Support old runas usage
        user = runas
        runas = None

    # check if user exists and remove it
    if __salt__["postgres.user_exists"](name, runas=user):
        if __opts__["test"]:
            ret["result"] = None
            ret["comment"] = "User {0} is set to be removed".format(name)
            return ret
        if __salt__["postgres.user_remove"](name, runas=user):
            ret["comment"] = "User {0} has been removed".format(name)
            ret["changes"][name] = "Absent"
            return ret
        else:
            ret["result"] = False
            ret["comment"] = "User {0} failed to be removed".format(name)
            return ret
    else:
        ret["comment"] = "User {0} is not present, so it cannot be removed".format(name)

    return ret