}
		return c, matches
	}
	return nil, nil
}

// firstSegment splits path into its first segment, and the rest.
// The path must begin with "/".
// If path consists of only a slash, firstSegment returns ("/", "").
// The segment is returned unescaped, if possible.
func firstSegment(path string) (seg, rest string) {
	if path == "/" {
		return "/", ""
	}

		{"/", []string{"/"}},
		{"/a/%62/c", []string{"a", "b", "c"}},
		{"/a%2Fb%2fc", []string{"a/b/c"}},
	} {
		var got []string
		rest := test.in
		for len(rest) > 0 {
			var seg string
			seg, rest = firstSegment(rest)
			got = append(got, seg)
		}
		if !slices.Equal(got, test.want) {
			t.Errorf("%q: got %v, want %v", test.in, got, test.want)
		}
	}
}

// TODO: test host and method
var testTree *routingNode