239b7e8337
coroutine_clone: add comments I was very surprised to learn that coroutines can be cloned. This has non-trivial semantic consequences that I do not think have been considered. Lucky enough, it's still unstable. Let's add some comments and pointers so we hopefully become aware when a MIR opt actually is in conflict with this. Cc `@rust-lang/wg-mir-opt`
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