More outdated examples

This example in User's Guide section 7.2 doesn't work anymore at all:

tgl=> select @ text '-4.5' as "abs";abs
-----4.5
(1 row)

What really happens is this:

=> select @ text '-4.5' as "abs";
ERROR:  Unable to identify a prefix operator '@' for type 'text'       You may need to add parentheses or an explicit
cast

Again, delete or new example?

-- 
Peter Eisentraut   peter_e@gmx.net