delete inside for plpgsql loop on same relation?

[Rob Nikander]

Hi,

Are there guarantees about how this plpgsql behaves? It’s deleting from a table 
while it loops over it. So far it seems like the delete is logically after the 
select, as I hoped, and doesn’t interfere. 

    for row in select * from some_stuff loop
        delete from some_stuff where …
        ...
    end loop;

I’m using a temporary table of “things to process” and looping over it, 
deleting the ones as I go.

I don’t see anything mentioned here: 
https://www.postgresql.org/docs/11/plpgsql-control-structures.html#PLPGSQL-RECORDS-ITERATING

Rob