normalize adt fields during structural match checking #72897
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Apparently this works even if I believe it shouldn't... edit: I think this is ok as we only check if consts are structurally matchable (at least on stable), which should always be fully monomorphic. |
eddyb
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Jun 4, 2020
| @@ -251,7 +251,10 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for Search<'a, 'tcx> { | |||
| // fields of ADT. | |||
| let tcx = self.tcx(); | |||
| for field_ty in adt_def.all_fields().map(|field| field.ty(tcx, substs)) { | |||
| if field_ty.visit_with(self) { | |||
| let ty = self.tcx().normalize_erasing_regions(ty::ParamEnv::empty(), field_ty); | |||
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ty::Param::empty() is incorrect - frankly I wonder if we should remove it.
You should have a ParamEnv around.
(couple minutes later)
Hang on, this entire file is missing real ParamEnvs?
That's liable to cause ICEs if generic parameters end up in these types.
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Does this block this PR? Afaik it's currently not possible on stable to hit this case.
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I may go ahead and fix this afterwards, but my current priority is mainly to fix #72896
Which probably means that we have to backport this to beta.
Another option would be to revert the structural match check for projections 🤔
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Its probably my fault that we don't have ParamEnvs threaded through here. This whole thing of switching from attributes to traits has been a real rabbit hole.
Still, I think landing this is better than reverting the structural match check for projections.
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@bors r+ Lets land this band-aid now, even with the |
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📌 Commit 4725af3 has been approved by |
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Should this PR be backported to beta? |
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@bors rollup=never p=1 |
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⌛ Testing commit 4725af3 with merge 7262762fc854593a2e5b1ac0715027967415b888... |
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@bors retry yield |
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Jun 10, 2020
Rollup of 9 pull requests Successful merges: - rust-lang#72706 (Add windows group to triagebot) - rust-lang#72789 (resolve: Do not suggest imports from the same module in which we are resolving) - rust-lang#72890 (improper ctypes: normalize return types and transparent structs) - rust-lang#72897 (normalize adt fields during structural match checking) - rust-lang#73005 (Don't create impl candidates when obligation contains errors) - rust-lang#73023 (Remove noisy suggestion of hash_map ) - rust-lang#73070 (Add regression test for const generic ICE in rust-lang#72819) - rust-lang#73157 (Don't lose empty `where` clause when pretty-printing) - rust-lang#73184 (Reoder order in which MinGW libs are linked to fix recent breakage) Failed merges: r? @ghost
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Discussed in todays T-compiler meeting. Approved for beta-backport. |
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Jun 15, 2020
…-morse,Mark-Simulacrum [beta] backport This is a beta backport rollup of the following: * [beta] Revert heterogeneous SocketAddr PartialEq impls rust-lang#73318 * Fix emcc failure for wasm32. rust-lang#73213 * Revert rust-lang#71956 rust-lang#73153 * [beta] Update cargo rust-lang#73141 * Minor: off-by-one error in RELEASES.md rust-lang#72914 * normalize adt fields during structural match checking rust-lang#72897 * Revert pr 71840 rust-lang#72989 * rust-lang/cargo#8361 * e658200 from rust-lang#72901 r? @ghost
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fixes #72896
currently only fixes the issue itself and compiles stage 1 libs.
I believe we have to use something else to normalize the adt fields here,
as I expect some partially resolved adts to cause problems 🤔
stage 1 libs and the test itself pass, not sure about the rest...
Will spend some more time looking into it tomorrow.
r? @pnkfelix cc @eddyb