Fix NLL typeck ICEs #61488
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Fix NLL typeck ICEs #61488
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…r=pnkfelix Fix NLL typeck ICEs * Don't ICE when a type containing a region is constrained by nothing * Don't ICE trying to normalize a type in a `ParamEnv` containing global bounds. To explain what was happening in the `issue-61311-normalize.rs` case: * When borrow checking the `the_fn` in the last `impl` we would try to normalize `Self::Proj` (`<Unit as HasProjFn>::Proj`). * We would find the `impl` that we're checking and and check its `where` clause. * This would need us to check `<Box<dyn Obj + 'static> as HasProj>::Proj: Bound` * We find two possible implementations, the blanket impl and the bound in our `ParamEnv`. * The bound in our `ParamEnv` was canonicalized, so we don't see it as a global bound. As such we prefer it to the `impl`. * This means that we cannot normalize `<Box<dyn Obj + 'static> as HasProj>::Proj` to `Unit`. * The `<Box<dyn Obj + 'static> as HasProj>::Proj: Bound` bound, which looks like it should be in our `ParamEnv` has been normalized to `Unit: Bound`. * We fail to prove `<Box<dyn Obj + 'static> as HasProj>::Proj: Bound`. * We ICE, since we believe typeck have errored. Closes rust-lang#61311 Closes rust-lang#61315 Closes rust-lang#61320 r? @pnkfelix cc @nikomatsakis
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…r=pnkfelix Fix NLL typeck ICEs * Don't ICE when a type containing a region is constrained by nothing * Don't ICE trying to normalize a type in a `ParamEnv` containing global bounds. To explain what was happening in the `issue-61311-normalize.rs` case: * When borrow checking the `the_fn` in the last `impl` we would try to normalize `Self::Proj` (`<Unit as HasProjFn>::Proj`). * We would find the `impl` that we're checking and and check its `where` clause. * This would need us to check `<Box<dyn Obj + 'static> as HasProj>::Proj: Bound` * We find two possible implementations, the blanket impl and the bound in our `ParamEnv`. * The bound in our `ParamEnv` was canonicalized, so we don't see it as a global bound. As such we prefer it to the `impl`. * This means that we cannot normalize `<Box<dyn Obj + 'static> as HasProj>::Proj` to `Unit`. * The `<Box<dyn Obj + 'static> as HasProj>::Proj: Bound` bound, which looks like it should be in our `ParamEnv` has been normalized to `Unit: Bound`. * We fail to prove `<Box<dyn Obj + 'static> as HasProj>::Proj: Bound`. * We ICE, since we believe typeck have errored. Closes rust-lang#61311 Closes rust-lang#61315 Closes rust-lang#61320 r? @pnkfelix cc @nikomatsakis
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Rollup of 5 pull requests Successful merges: - #61069 (Make MIR drop terminators borrow the dropped location) - #61453 (Remove unneeded feature attr from atomic integers doctests) - #61488 (Fix NLL typeck ICEs) - #61500 (Fix regression 61475) - #61523 (Hide gen_future API from documentation) Failed merges: r? @ghost
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ParamEnvcontaining global bounds.To explain what was happening in the
issue-61311-normalize.rscase:the_fnin the lastimplwe would try to normalizeSelf::Proj(<Unit as HasProjFn>::Proj).implthat we're checking and and check itswhereclause.<Box<dyn Obj + 'static> as HasProj>::Proj: BoundParamEnv.ParamEnvwas canonicalized, so we don't see it as a global bound. As such we prefer it to theimpl.<Box<dyn Obj + 'static> as HasProj>::ProjtoUnit.<Box<dyn Obj + 'static> as HasProj>::Proj: Boundbound, which looks like it should be in ourParamEnvhas been normalized toUnit: Bound.<Box<dyn Obj + 'static> as HasProj>::Proj: Bound.Closes #61311
Closes #61315
Closes #61320
r? @pnkfelix
cc @nikomatsakis