Fix late-bound lifetime closure ICEs in HIR typeck and MIR borrowck #103780
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r? @wesleywiser (rustbot has picked a reviewer for you, use r? to override) |
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@compiler-errors are you missing part of the first commit? The diff is unrelated to the message. |
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@cjgillot I didn't forget anything, though I could've named it better. Let me rename it. |
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| if let Some(late_bounds) = tcx.is_late_bound_map(fn_def_id.expect_local()) { | ||
| for ®ion_def_id in late_bounds.iter() { | ||
| let name = tcx.item_name(region_def_id.to_def_id()); | ||
| let typeck_root_def_id = tcx.typeck_root_def_id(mir_def_id.to_def_id()); |
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To have a single loop, we can use while tcx.is_typeck_child(mir_def_id.to_def_id()).
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That doesn't loop over the root def id, but stops one def id before it -- I'm not sure if I understand?
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| ) -> IndexVec<RegionVid, ty::Region<'tcx>> { | ||
| let mut region_mapping = IndexVec::with_capacity(expected_num_vars); | ||
| region_mapping.push(tcx.lifetimes.re_static); | ||
| tcx.for_each_free_region(&closure_substs, |fr| { | ||
| region_mapping.push(fr); | ||
| }); | ||
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| for_each_late_bound_region_defined_on(tcx, typeck_root_def_id, |r| { | ||
| for_each_late_bound_region_in_recursive_scope(tcx, tcx.local_parent(closure_def_id), |r| { |
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Nit: This functions now assumes being called from the strict parent of the closure, not any higher parent. Can we make it a method on UniversalRegions and add assert_eq!(self.len(), expected_num_vars) and assert_eq!(self.defining_ty.def_id(), tcx.parent(closure_def_id))
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Can we make it a method on UniversalRegions
Make what a method? for_each_late_bound_region_in_recursive_scope?
and add assert_eq!(self.len(), expected_num_vars)
What's the difference between this assertion and the one that happens below?
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Make what a method?
I meant closure_mapping.
What's the difference between this assertion and the one that happens below?
Oops, I missed that. I guess it is sufficient then.
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r=me with or without @aliemjay's comment |
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@bors r=jackh726 |
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#103680 (CStr: add some doc links) - rust-lang#103780 (Fix late-bound lifetime closure ICEs in HIR typeck and MIR borrowck) - rust-lang#103845 (Add track_caller to some Lock methods) - rust-lang#103935 (Remove rustdoc clean::Visibility type) - rust-lang#103941 (Fixed typos) - rust-lang#103950 (Fix ICE when negative impl is collected during eager mono) - rust-lang#103953 (Remove unused argument from `throw_unresolved_import_error`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
During HIR typeck, we need to teach astconv to treat late-bound regions within a closure body as free, fixing escaping bound vars ICEs in both of the issues below.
However, this then gets us to MIR borrowck, which itself needs to be taught how to instantiate free region vids for late-bound regions that come from items that aren't the typeck root (for now, just closures).
Fixes #103771
Fixes #103736