# File lib/rack/utils.rb, line 57
57:     def parse_nested_query(qs, d = nil)
58:       params = {}
59: 
60:       (qs || '').split(d ? /[#{d}] */n : DEFAULT_SEP).each do |p|
61:         k, v = unescape(p).split('=', 2)
62:         normalize_params(params, k, v)
63:       end