}

type resolver struct {
	localQueries      []*query // queries for absolute or relative paths
	pathQueries       []*query // package path literal queries in original order
	wildcardQueries   []*query // path wildcard queries in original order
	patternAllQueries []*query // queries with the pattern "all"

	// Indexed "none" queries. These are also included in the slices above;

}

// transportRequest is a wrapper around a *Request that adds
// optional extra headers to write and stores any error to return
// from roundTrip.
type transportRequest struct {
	*Request                        // original request, not to be mutated
	extra    Header                 // extra headers to write, or nil
	trace    *httptrace.ClientTrace // optional

	ctx    context.Context // canceled when we are done with the request