Quoting in stored procedures

The syntax needed for defining functions is quite annoying because of the
needed quoting. Example:

CREATE FUNCTION bla (int4) RETURNS char AS '
BEGIN
RETURN ''Two quotes needed''
END;
' LANGUAGE 'plpgsql';

How about allowing something like in shell here-documents:

CREATE FUNCTION bla (int4) RETURNS char LANGUAGE 'plpgsql' UNTIL '__EOF__';
BEGIN
RETURN 'Only one quote needed'
END;
__EOF__

Or similar. The __EOF__ is of course totally arbitrary and every string can
be used, so this will work with any language used.

jochen