Re: pgbench - allow backslash continuations in \set expressions

> Attached patch does what is described in the title, hopefully. Continuations
> in other pgbench backslash-commands should be dealt with elsewhere...
>
> Also attached is a small test script.

Here is another approach, with "infered" continuations: no backslash is
needed, the parsing is pursued if the last token of the line cannot end an
expression (eg an operator) or if there is an unclosed parenthesis.

I think that backslashes are less surprising for the classically minded
user, but this one is more fun:-) Also, this version changes a little more
the scanner because on each token the next state (continued or not) must
be decided.

--
Fabien.