# Buggy code
def installed(name, default=False, runas=None, user=None):
    """
    Verify that the specified ruby is installed with rbenv. Rbenv is
    installed if necessary.

    name
        The version of ruby to install

    default : False
        Whether to make this ruby the default.

    runas: None
        The user to run rbenv as.

        .. deprecated:: 0.17.0

    user: None
        The user to run rbenv as.

        .. versionadded:: 0.17.0

    .. versionadded:: 0.16.0
    """
    ret = {"name": name, "result": None, "comment": "", "changes": {}}

    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

    if name.startswith("ruby-"):
        name = re.sub(r"^ruby-", "", name)

    if __opts__["test"]:
        ret["comment"] = "Ruby {0} is set to be installed".format(name)
        return ret

    ret = _check_rbenv(ret, user)
    if ret["result"] is False:
        if not __salt__["rbenv.install"](user):
            ret["comment"] = "Rbenv failed to install"
            return ret
        else:
            return _check_and_install_ruby(ret, name, default, user=user)
    else:
        return _check_and_install_ruby(ret, name, default, user=user)


# 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 installed(name, default=False, runas=None, user=None):
    """
    Verify that the specified ruby is installed with rbenv. Rbenv is
    installed if necessary.

    name
        The version of ruby to install

    default : False
        Whether to make this ruby the default.

    runas: None
        The user to run rbenv as.

        .. deprecated:: 0.17.0

    user: None
        The user to run rbenv as.

        .. versionadded:: 0.17.0

    .. versionadded:: 0.16.0
    """
    ret = {"name": name, "result": None, "comment": "", "changes": {}}

    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

    if name.startswith("ruby-"):
        name = re.sub(r"^ruby-", "", name)

    if __opts__["test"]:
        ret["comment"] = "Ruby {0} is set to be installed".format(name)
        return ret

    ret = _check_rbenv(ret, user)
    if ret["result"] is False:
        if not __salt__["rbenv.install"](user):
            ret["comment"] = "Rbenv failed to install"
            return ret
        else:
            return _check_and_install_ruby(ret, name, default, user=user)
    else:
        return _check_and_install_ruby(ret, name, default, user=user)