Detect cyclic subtype goals in new solver #110202
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r? @cjgillot (rustbot has picked a reviewer for you, use r? to override) |
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Some changes occurred to the core trait solver cc @rust-lang/initiative-trait-system-refactor |
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whoops r? @lcnr |
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is this only to not get fulfillment overflow? because i personally would like to avoid this and just accept that fulfillment overflows for these 🤔 |
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Decided against this I think |
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Bubble up subtyping relations that become stalled so that the generalizer can eagerly detect cyclic responses to goals such as
?0 <: Box<?1>when?0 <: ?1is already a registered subtype obligation. Otherwise, processing these two in tandem will cause us to repeatedly substitute and get a runaway type.Fixes compiler-errors/next-solver-hir-issues#18
Opening for discussion mostly.