plperl validator function

Andrew Dunstan <andrew@dunslane.net> writes:

That attached 2 patches implement a validator function for plperl, and
support for it in createlang.

Applied. (BTW, a single patch file is generally easier to deal with.)

This has somewhat less utility than do such functions for languages with
stricter compiletime as opposed to runtime requirements, but I still
think it's useful. If this is acceptable I'll provide a regression test
in due course - I don't think any documentation is required.

I don't really see the need for a separate regression test --- the thing
is implicitly exercised by each function you create, anyway.

regards, tom lane