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Use ops::ControlFlow in rustc_data_structures::graph::iterate Since I only know about this because you mentioned it, r? @ecstatic-morse If we're not supposed to use new `core` things in compiler for a while then feel free to close, but it felt reasonable to merge the two types since they're the same, and it might be convenient for people to use `?` in their traversal code. (This doesn't do the type parameter swap; NoraCodes has signed up to do that one.)