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intern.rs:182: const qualif failed to prevent mutable references #62045

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whitequark opened this issue Jun 22, 2019 · 9 comments · Fixed by #62094
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intern.rs:182: const qualif failed to prevent mutable references #62045

whitequark opened this issue Jun 22, 2019 · 9 comments · Fixed by #62094
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@oli-obk
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A-const-eval Area: constant evaluation (mir interpretation) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ regression-from-stable-to-nightly Performance or correctness regression from stable to nightly. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@whitequark
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whitequark commented Jun 22, 2019 •
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The build of smoltcp on nightly started failing recently with an ICE: https://travis-ci.org/m-labs/smoltcp/jobs/549023810#L789-L804.

I suspect this might be caused by E0713, but it shouldn't be an ICE in any case.
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@jonas-schievink jonas-schievink added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ I-nominated regression-from-stable-to-nightly Performance or correctness regression from stable to nightly. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jun 22, 2019
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@jonas-schievink jonas-schievink added E-needs-bisection Call for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example labels Jun 22, 2019
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eddyb commented Jun 23, 2019

cc @oli-obk @RalfJung (also, such an ICE should say "const checking" or similar - we should maybe even rename the pass itself in the compiler - the "qualify" part isn't as primary for MIR as it is for the AST side).

@eddyb eddyb added the A-const-eval Area: constant evaluation (mir interpretation) label Jun 23, 2019
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whitequark commented Jun 23, 2019 •
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MCVE:

fn main() {
    assert_eq!(&mut [0; 1][..], &mut []);
}

I'm bisecting it now.

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whitequark commented Jun 23, 2019 •
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Bisected to 9cb052a / #58351. @RalfJung @oli-obk

@jonas-schievink jonas-schievink removed E-needs-bisection Call for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example labels Jun 23, 2019
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oli-obk commented Jun 23, 2019

Oh, I forgot about the ZST trickery, sorry, will have a fix tomorrow

@oli-obk oli-obk self-assigned this Jun 23, 2019
@whitequark
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What's the ZST here? [] in &mut []?

@RalfJung
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Yes. That's a &mut [0; i32] that gets unsized to &mut [].

@oli-obk oli-obk mentioned this issue Jun 24, 2019
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bors added a commit that referenced this issue Jun 25, 2019
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Auto merge of #62094 - oli-obk:zst_intern, r=eddyb
10deeae 
 Don't ICE on mutable zst slices

fixes #62045
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@oli-obk oli-obk

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A-const-eval Area: constant evaluation (mir interpretation) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ regression-from-stable-to-nightly Performance or correctness regression from stable to nightly. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Don't ICE on mutable zst slices oli-obk/rust
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@whitequark @eddyb @RalfJung @oli-obk @jonas-schievink