feat: add assignment operator macros #1320
Merged
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These macros apply an operation to the current value of a variable and
then set the variable to the result of the application. They are
effectively sugar for writing
(set! <var> (<op> <var> <val>))
andshould be familiar to those who have programmed in imperative languages
like C.
In Carp, all the underlying operations these macros use are interfaces,
so one can flexibly use them for more than just numeric types.
Example usage: