Shorthand assignment operators

[akhilmd]

RustLexer.py has the following:

t_TIMESEQUAL        = r'\*='
t_DIVEQUAL          = r'/='
t_MODULUSEQUAL      = r'%='
t_PLUSEQUAL         = r'\+='
t_MINUSEQUAL        = r'-='

For this, implement required production rules.

[Rahul-RB]

Sure, convert them into functions and return the token taken as input.

[akhilmd]

@Rahul-RB, no, we'll need to add another production rule to replace EQUALS in the assignStmt production rule and alter the rhs variable in its action by adding a BinaryOp node based on the given shorthand operator.

But, this is not priority and may break assignments, so we can do it later.

[ganesh-k13]

Is this still a thing? I want to do it.

[akhilmd]

Well, there are a lot critical WIP changes here. I think we should wrap that up before trying this. We should implement this only if it does not cause any adverse behaviour in the optimisations part.