anchor.diff:  	tryPathFilename("", expect: "");
   }
   
  -unittest std.io.path.folder
  -{
  +unittest std.io.path.folder {
   	var tryPathFolder = func (cref path: string, cref expect: string) {
   		ref got = std.io.path.folder(path);
   		if got != expect then {
  
positive.code: 	tryPathStem("", expect: "");
  }
  
  unittest std.io.path.normalize
  {
  	var tryPathNormalize = func (cref path: string, cref expect: string) {
  		var got = std.io.path.normalize(path);
  		if got != expect then {
  
negative.code: // License, v. 2.0. If a copy of the MPL was not distributed with this
  // file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
  
  unittest std.io.path.extension {
  	var tryPathExtension = func (cref file: string, cref expect: string, cref withDot: string) {
  		var expectHas = (not withDot.empty);
  		ref expectDot = withDot;
  