Add negative test for IN parsing

[alamb]

While reviewing #463 I wrote this test for expected errors errors when trying to parse <expr> IN <expr>

This is consistent with postgres

alamb=# select * from a where a in a;
ERROR:  syntax error at or near "a"
LINE 1: select * from a where a in a;

And mysql

mysql> select * from foo where bar IN bar;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'bar' at line 1

[coveralls]

Pull Request Test Coverage Report for Build 2215310091

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.007%) to 90.369%

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Totals
Change from base Build 2207579286:	0.007%
Covered Lines:	8004
Relevant Lines:	8857

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💛 - Coveralls