More outdated examples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(at)gmx(dot)net