Syntax error at or near "unnest" - postgresql

Question

This request:
unnest('{1,2}'::int[]);
gives to me this error:
syntax error at or near "unnest"
neither unnest('{1,2}'); works
Why?
intire:
CREATE OR REPLACE FUNCTION result() RETURNS setof users AS
$$
DECLARE
BEGIN
unnest('{1,2}'::int[]);
RETURN QUERY SELECT * FROM users;
END;
$$ LANGUAGE plpgsql;
SELECT result();
EDIT
The core idea:
To retrive and manipualate with the bigint[] which is stored inside in a column.
So, i have got this:
SELECT * FROM users WHERE email = email_ LIMIT 1 INTO usr;
Then, usr.chain contains some bigint[] data. For example, {1,2,3,4,5,6,7,8,9,10}. I want to save only the 4 last of them.
How to retrieve {7,8,9,10} and {1,2,3,4,5,6} and iterate over these arrays?
I only found the solution is to use SELECT FROM unnest(usr.chain) AS x ORDER BY x ASC LIMIT (sdl - mdl) OFFSET mchain and so on. but unnest function gives to me this stupid error. I'm really do not understand why it happends. It doesn't work in sucj easy case I wrote at the beginning of the question. subarray function doesn't work because of the data type is bigint[] not int[]
Futher more, the code unnest(ARRAY[1,2]) gives to me the same error.
http://www.postgresql.org/docs/9.2/static/functions-array.html
The same error for array_append function

Answer 1

to iterate over array:
CREATE OR REPLACE FUNCTION someresult(somearr bigint[] ) RETURNS setof bigint AS
$$
DECLARE
i integer;
x bigint;
BEGIN
for x in select unnest($1)
loop
-- do something
return next x;
end loop;
-- or
FOR i IN array_lower($1, 1) .. array_upper($1, 1)
LOOP
-- do something like:
return next ($1)[i];
end loop;
END;
$$ LANGUAGE plpgsql;
select someresult('{1,2,3,4}') ;
array_append ....
CREATE OR REPLACE FUNCTION someresult2(somearr bigint[],val bigint ) RETURNS bigint[] AS
$$
DECLARE
somenew_arr bigint[];
BEGIN
somenew_arr = array_append($1, $2 );
return somenew_arr;
END;
$$ LANGUAGE plpgsql;
select someresult2('{1,2,3,4}' ,222) ;
so, here you have basic example how to iterate and append arrays. Now can you write step by step what you want to do, to achieve .