class_docstr: Matches documents containing a list of sub-queries in the given order.
      
code: def _matcher(self, subs, searcher, context):
      from whoosh.query.spans import SpanBefore
  
      return self._tree_matcher(
          subs, SpanBefore._Matcher, searcher, context, None
      )
  
imports: from __future__ import division
  import copy
  from whoosh import matching
  from whoosh.analysis import Token
  from whoosh.compat import u
  from whoosh.query import qcore, terms, compound
label_desc: Use image node_id 1 for calling the Ordered obj's underlying member method code with example usage: obj._matcher(subs, searcher, context) and returns: self