Add test coverage for parsing unclosed statements.
Add test coverage for parsing unclosed statements.

See #181
adetch/psysh,lvht/psysh,damiankloip/psysh,bobthecow/psysh,lvht/psysh,damiankloip/psysh,adetch/psysh,damiankloip/psysh,bobthecow/psysh