Code insight does not work for conditional compilation

This code is not parsed correctly by sql developer 4.2. It gives the message:

Syntax error. Partially recognized rules (railroad diagrams): ELSEIF plus := $ELSIF ...

on line 4 (gt_fermoccurences ...)

It seems it expects only 1 line of code after the $if

CREATE PROCEDURE TST AS

    $if $$ferm_dbg $then

        TYPE t_fermoccurences IS TABLE OF VARCHAR2(30) INDEX BY VARCHAR2(60);

        gt_fermoccurences t_fermoccurences;

    $end

BEGIN

    NULL;

END;