Does the cursor in a for loop statement in Oracle close when the function exits?

Question

Oracle

The official documentation does not describe what happens to the cursor if called RETURNinside CURSOR FOR LOOP STATEMENT. Perhaps I misunderstood something, so I'm asking here if the cursor closes or not?
Maybe someone met with a similar situation in the process of work and knows for sure, or can tell where to dig?
Approximate description of the function:

FUNCTION FUNC_NAME RETURN  VARCHAR2
AS
    CURSOR cursor_name IS SELECT DISTINCT field_name FROM table_name;               
BEGIN
    FOR row IN cursor_name LOOP
        RETURN NULL; -- Закроется ли курсор после выполнения этой строки?
    END LOOP;
    RETURN NULL;
END FUNC_NAME;

The code is not working, it is written in order to make it clear what the question is about.
Link to off documentation docs.oracle.com/cd/E11882_01/appdev.112/e17126/cur... .

Answer 1

During an exception, the cursor closes automatically. I think that during the return too.
A quick search turned up this:
Oracle PL/SQL For Dummies. Authors: Michael Rosenblum,Paul Dorsey
page 152
Found at this link.

Answer 2

Here are some interesting comments and some useful links - www.sql.ru/forum/1027878/chto-esli-ne-zakryvat-kursor-v-pl-sql?hl=%e7%e0%ea%f0%fb%f2% e8%e5%20%ea%f3%f0%f1%ee%f0%e0