Adrian Klaver <adrian(dot)klaver(at)gmail(dot)com> writes:
> This does not work:
> test=> select timestamp(now()::timestampz);
> ERROR: syntax error at or near "now"
timestamp(something) is a type name. Per the comment in gram.y:
* The type names appearing here are not usable as function names
* because they can be followed by '(' in typename productions, which
* looks too much like a function call for an LR(1) parser.
regards, tom lane