Tcl_Interp *interp,		/* Interpreter in which to find frame. */
    Tcl_Obj *objPtr,		/* Object describing frame. */
    CallFrame **framePtrPtr)	/* Store pointer to frame here (or NULL if
				 * global frame indicated). */
{
    register Interp *iPtr = (Interp *) interp;
    int curLevel, level, result;
    const Tcl_ObjIntRep *irPtr;
    const char *name = NULL;

    /*
     * Parse object to figure out which level number to go to.
     */

    result = 0;
    curLevel = iPtr->varFramePtr->level;

    /*
     * Check for integer first, since that has potential to spare us
     * a generation of a stringrep.
     */

    if (objPtr == NULL) {
	/* Do nothing */
    } else if (TCL_OK == Tcl_GetIntFromObj(NULL, objPtr, &level)
	    && (level >= 0)) {
	level = curLevel - level;
	result = 1;
    } else if (objPtr->typePtr == &levelReferenceType) {
	level = (int) objPtr->internalRep.longValue;
    } else if ((irPtr = Tcl_FetchIntRep(objPtr, &levelReferenceType))) {
	level = irPtr->longValue;
	result = 1;
    } else {
	name = TclGetString(objPtr);
	if (name[0] == '#') {
	    if (TCL_OK == Tcl_GetInt(NULL, name+1, &level) && level >= 0) {
		TclFreeIntRep(objPtr);
		objPtr->typePtr = &levelReferenceType;
		objPtr->internalRep.longValue = level;
		Tcl_ObjIntRep ir;

		ir.longValue = level;
		Tcl_StoreIntRep(objPtr, &levelReferenceType, &ir);
		result = 1;
	    } else {
		result = -1;
	    }
	} else if (isdigit(UCHAR(name[0]))) { /* INTL: digit */
	    /*
	     * If this were an integer, we'd have succeeded already.