infer for a proc whether it is OK to pass an argument as borrowed #6585
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NOTE: this is not actually hooked up
there are also these limits
List *
andStr
layouts, or lambda sets containing just those layoutsthe next step is to walk the topological sort of procs and for each SCC run this inference until fixpoint. At that point we can call other (user) functions and pass arguments as borrowed. I'm not sure yet if we need to change something about functions themselves when one of the arguments is passed to it as borrowed. I suspect we do which means more thinking is required