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The new dereferencing syntaxes (new Foo)->bar and (new Foo)['bar'] were causing a shift/reduce conflict with the '(' expr ')' rule. When (new Foo) was encountered (without dereference operators following) the parser thus threw a parse error. The fix simply adds a special '(' new_expr ')' rule to expr. This does not remove the shift/reduce conflict itself, but makes it irrelevant. This fixes issue #20.