anchor.diff:  	tryPathStem("", expect: "");
   }
   
  -unittest std.io.path.normalize
  -{
  +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 {
  
positive.code: 	tryPathFilename("", expect: "");
  }
  
  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 {
  
negative.code: 	tryPathFolder("", expect: "");
  }
  
  unittest std.io.path.parent {
  	var tryPathParentFolder = func (cref path: string, cref expect: string) {
  		ref got = std.io.path.parent(path);
  		if got != expect then {
  