Joseph Ferano
92ca8c9774
NEXT.md is what is left, so the three steps go, the four questions that were unsettled under them are answered or replaced, and the reasoning that outlives the change moves to BUILT.md: why Allocator being a builtin opaque type made milestone 5 unnecessary, why with-allocator is its own IR node, why the move rule unions at a join, what ownership is not transitive through yet and what each refusal waits on, and why StorageExhausted had to land with Vec. Four things replace the old open list. The use-after-release question is still open but now has evidence available for the first time, because there is a Vec to write arena programs with. The release layout is blocked on the reload path carrying build flags. The generation word has no reader and will not have one until a slice can carry a Vec's identity. And the budget is an addition to the spec that wants folding in or replacing with a growable arena.
