How to use the merlin.helpers.merlin_pos function in merlin

Show a simple gutter icon for each parsing error.
        """

        view.erase_regions('ocaml-underlines-errors')

        errors = merlin_view(view).report_errors()

        error_messages = []
        underlines = []

        for e in errors:
            if 'start' in e and 'end' in e:
                pos_start = e['start']
                pos_stop = e['end']
                pnt_start = merlin_pos(view, pos_start)
                pnt_stop = merlin_pos(view, pos_stop)
                r = sublime.Region(pnt_start, pnt_stop)
                line_r = view.full_line(r)
                line_r = sublime.Region(line_r.a - 1, line_r.b)
                underlines.append(r)

                # Remove line and character number
                message = e['message']

                error_messages.append((line_r, message))

        self.error_messages = error_messages
        flag = sublime.DRAW_OUTLINED
        # add_regions(key, regions, scope, icon, flags)
        view.add_regions('ocaml-underlines-errors', underlines, 'invalid',
                         self.gutter_icon_path(), flag)

"""
        Show a simple gutter icon for each parsing error.
        """

        view.erase_regions('ocaml-underlines-errors')

        errors = merlin_view(view).report_errors()

        error_messages = []
        underlines = []

        for e in errors:
            if 'start' in e and 'end' in e:
                pos_start = e['start']
                pos_stop = e['end']
                pnt_start = merlin_pos(view, pos_start)
                pnt_stop = merlin_pos(view, pos_stop)
                r = sublime.Region(pnt_start, pnt_stop)
                line_r = view.full_line(r)
                line_r = sublime.Region(line_r.a - 1, line_r.b)
                underlines.append(r)

                # Remove line and character number
                message = e['message']

                error_messages.append((line_r, message))

        self.error_messages = error_messages
        flag = sublime.DRAW_OUTLINED
        # add_regions(key, regions, scope, icon, flags)
        view.add_regions('ocaml-underlines-errors', underlines, 'invalid',
                         self.gutter_icon_path(), flag)

def _item_region(self, item):
        start = merlin_pos(self.view, item['start'])
        end = merlin_pos(self.view, item['end'])
        return sublime.Region(start, end)

def _item_region(self, item):
        start = merlin_pos(self.view, item['start'])
        end = merlin_pos(self.view, item['end'])
        return sublime.Region(start, end)

def merlin_locate_result(result, window):
    if isinstance(result, dict):
        pos = result['pos']
        if 'file' in result:
            filename = "%s:%d:%d" % (result['file'], pos['line'], pos['col'] + 1)
            window.open_file(filename, sublime.ENCODED_POSITION | sublime.TRANSIENT)
        else:
            view = window.active_view()
            sel = view.sel()
            sel.clear()
            pos = merlin_pos(view, pos)
            sel.add(sublime.Region(pos, pos))
            view.show_at_center(pos)
    else:
        sublime.message_dialog(result)