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The code is not used anywhere in\r\ncodegen right now, it can be tested by using (:stknew typ args...)\r\ninstead of :new. It is essentially the GC side of #8134 but without the\r\nglobal alloca stack & unmarking, so @JeffBezanson will probably be happier.\r\n\r\nStack objects are kept marked (+young) permanently and are only scanned\r\nwhen coming from the owning task.\r\n\r\nNote that this is on top of jn/codegen_rewrite under the \"no codegen change policy\" :-)\r\n\r\ncc @vtjnash 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