* Fix expressions with multiple operators.
Expressions such as ``1 +2;`` or ``300*200`` work, but expressions which have multiple operations do not work. For example: ``1+2+3+4`` does not work, and has to be put in a chain of parentheses to get it to work. The other valid expressions are getting evaluated to the value of the first operator, for instance, ``1*2*3`` becomes 2, by evaluating 1*2 and so on.
This can be solved by adding a loop, converting the first two expressions into ``lhs`` and continuing until there are no more ``pair``s.
* Added tests
* Fixed test
Fixed mistake in making assertion of ``1 + 2 +3 == 2+2+3``
* Style correction.
* Update parser.rs
Yet another attempt to make rustfmt happy.
ehsanmok
Preston Hager
Nafi-Amaan-Hossain
Ehsan M. Kermani