Fix miri test failure

[taiki-e]

No description provided.

[taiki-e]

bors r+

[bors]

Canceled.

[taiki-e]

bors r+

[bors]

Build failed:

• ci

[taiki-e]

Hmm, Miri failed with ICE...

0.004090   thread 'rustc' panicked at 'slice index starts at 17 but ends at 0', library/core/src/slice/index.rs:92:5
0.000052   stack backtrace:
0.027705      0: rust_begin_unwind
0.000040                at /rustc/f8588549c3c3d45c32b404210cada01e2a45def3/library/std/src/panicking.rs:584:5
0.000013      1: core::panicking::panic_fmt
0.000009                at /rustc/f8588549c3c3d45c32b404210cada01e2a45def3/library/core/src/panicking.rs:142:14
0.000008      2: core::slice::index::slice_index_order_fail_rt
0.000008                at /rustc/f8588549c3c3d45c32b404210cada01e2a45def3/library/core/src/slice/index.rs:92:5
0.000010      3: core::ops::function::FnOnce::call_once
0.000008                at /rustc/f8588549c3c3d45c32b404210cada01e2a45def3/library/core/src/ops/function.rs:248:5
0.000010      4: core::intrinsics::const_eval_select
0.000009                at /rustc/f8588549c3c3d45c32b404210cada01e2a45def3/library/core/src/intrinsics.rs:2701:5
0.000017      5: core::slice::index::slice_index_order_fail
0.000010                at /rustc/f8588549c3c3d45c32b404210cada01e2a45def3/library/core/src/slice/index.rs:87:14
0.000710      6: <miri::stacked_borrows::stack::Stack>::access
0.000025      7: <miri::stacked_borrows::stack::Stack>::grant
0.000259      8: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::Evaluator> as miri::helpers::EvalContextExt>::visit_freeze_sensitive::<<rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::Evaluator> as miri::stacked_borrows::EvalContextPrivExt>::reborrow::{closure#1}>
0.000058      9: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::Evaluator> as miri::stacked_borrows::EvalContextPrivExt>::retag_reference
0.000042     10: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::Evaluator>>::statement
0.000019     11: miri::eval::eval_entry
0.000063     12: <rustc_interface::passes::QueryContext>::enter::<<miri::MiriCompilerCalls as rustc_driver::Callbacks>::after_analysis::{closure#0}, ()>
0.000030     13: <miri::MiriCompilerCalls as rustc_driver::Callbacks>::after_analysis
0.000425     14: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorGuaranteed>>
0.000309     15: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
0.000061     16: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>
0.000125     17: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
0.000010   note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
0.000008   
0.000020   error: internal compiler error: unexpected panic
0.000026   
0.000061   note: the compiler unexpectedly panicked. this is a bug.
0.000027   
0.000037   note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
0.000018   
0.000024   note: rustc 1.64.0-nightly (f8588549c 2022-07-18) running on x86_64-unknown-linux-gnu
0.000017   
0.000024   note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental -Z randomize-layout -Z miri-symbolic-alignment-check -Z miri-ignore-leaks
0.000017   
0.000022   note: some of the compiler flags provided by cargo are hidden
0.000018   
0.000019   query stack during panic:
0.000071   end of query stack
0.012952   warning: 5 warnings emitted
0.000042   
0.007112   error: test failed, to rerun pass '-p crossbeam --test subcrates'

https://github.com/crossbeam-rs/crossbeam/runs/7411416824?check_suite_focus=true

However, I cannot reproduce this ICE in #796 which is based on this PR.
Does Miri seem confused about the Int-to-ptr casts? (cc @RalfJung)

[RalfJung]

Hm yeah that is weird. Do you have a reproducible testcase?

[RalfJung]

Ah, got one.

Tracking this in Miri as rust-lang/miri#2389.

[taiki-e]

Thanks!

[taiki-e]

bors r+

[bors]

Build succeeded:

• ci