Re: improve pgbench syntax error messages

> Indeed. Here is a v2.

Here is a v3, which (1) activates better error messages from bison
and (2) improves the error reporting from the scanner as well.

> sh> ./pgbench -f bad.sql
> bad.sql:3: syntax error at column 23 in command "set"
> \set aid (1021 * :id) %
> ^ error found here

the improved message is:
bad.sql:3: syntax error, unexpected $end at column 23 in command "set"
\set aid (1021 * :id) %
^ error found here

Also scanner errors are better:

sh> ./pgbench -f bad5.sql
bad5.sql:1: unexpected character (a) at column 12 in command "set"
\set foo 12abc
^ error found here

--
Fabien.