code: def reads(s, filename, loader, implicit_tuple, allow_errors):
    
    try:
      the_context.filename = filename
      the_context.loader = loader
  
      grammar = make_grammar(allow_errors=allow_errors)
      root = grammar.start_tuple if implicit_tuple else grammar.start
  
      return root.parseWithTabs().parseString(s, parseAll=True)[0]
    except (p.ParseException, p.ParseSyntaxException) as e:
      loc = SourceLocation(s, find_offset(s, e.lineno, e.col))
      raise exceptions.ParseError(the_context.filename, loc, e.msg)
docs: Load but don't evaluate a GCL expression from a string.