This repo holds a sample implementation of the enhanced http.ServeMux routing patterns that are being discussed at golang/go#60227.
The ServeMux type should behave like http.ServeMux with the additional features
described in the discussion top post.
The Pattern type is used internally. It is exported here for experimentation.
The DescribeRelationship function will not be part of the proposed API, but it
can help in understanding how patterns are related.