*	(2) An additional mount point is established inside an existing
 *	filesystem (except for the native file system; see note below).
 *
 *	(3) A filesystem changes the list of available volumes (except for the
 *	native file system; see note below).
 *
 *	(4) The mapping from a string representation of a file to a full,
 *	normalized pathname changes. For example, if 'env(HOME)' is modified,
 *	then any pathname containing '~' maps to a different item, possibly in
 *	a different filesystem.
 *
 *	Tcl has no control over (2) and (3), so each registered filesystem must
 *	call Tcl_FSMountsChnaged in each of those circumstances.
 *
 *	The reason for the exception in 2,3 for the native filesystem is that
 *	the native filesystem claims every file without determining whether
 *	whether the file exists, or even whether the pathname makes sense.

	while ((*p != '\0') && (*p != separator)) {
	    p++;
	}
	length = p - elementStart;
	if (length > 0) {
	    Tcl_Obj *nextElt;

	    if (elementStart[0] == '~') {
		TclNewLiteralStringObj(nextElt, "./");
		Tcl_AppendToObj(nextElt, elementStart, length);
	    } else {
		nextElt = Tcl_NewStringObj(elementStart, length);
	    }
	    Tcl_ListObjAppendElement(NULL, result, nextElt);
	}
	if (*p++ == '\0') {
	    break;
	}
    }

    if (lenPtr != NULL) {