pl/pgsql and arrays[]

Some quetions about pl/pgsql and arrays[].

Is such constructions as:

RETURN NEXT array[1];

OR

SELECT val INTO array[1] FROM ...;

Should not work?

At least documentation about RETURN NEXT  says:
"RETURN NEXT expression;"

I think array[1] is a valid expression.

--
Maxim Boguk
Senior Postgresql DBA.