in my opinion you should use fully qualified names instead of set search_path
Your script should look like this:
CREATE OR REPLACE FUNCTION my_schema.foo()
RETURNS INTEGER AS $BODY$ BEGIN RETURN 42; END; $BODY$ LANGUAGE plpgsql IMMUTABLE COST 100;
CREATE OR REPLACE FUNCTION another_schema.bar() RETURNS INTEGER AS $BODY$ BEGIN RETURN my_schema.foo(); END; $BODY$ LANGUAGE plpgsql IMMUTABLE COST 100;
then script is readable and uses full qualified names.
