rustc crash with [dashmap](https://crates.io/crates/dashmap)

[misaka10987]

Code

Triggered by the third-party library dashmap.
src/lib.rs:

use dashmap::DashMap;

#[derive(PartialEq, Eq, Clone, Copy, Hash)]
pub struct Id(pub &'static str);

fn f(x: DashMap<Id, ()>) {
    let id = Id("key");
    x.view(&id, |k, _| k);
}

Cargo.toml

[package]
name = "crash"
version = "0.1.0"
edition = "2021"

[dependencies]
dashmap = "6.0.1"

Meta

rustc --version --verbose:

rustc 1.80.0 (051478957 2024-07-21) (Arch Linux rust 1:1.80.0-1)
binary: rustc
commit-hash: 051478957371ee0084a7c0913941d2a8c4757bb9
commit-date: 2024-07-21
host: x86_64-unknown-linux-gnu
release: 1.80.0
LLVM version: 18.1.8

Error output

error: internal compiler error: RegionError { fr_origin: FreeRegion, longer_fr: '?2, shorter_fr: '?1, is_reported: true }
  |
  = note: delayed at compiler/rustc_borrowck/src/region_infer/mod.rs:1607:31 - disabled backtrace

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

note: rustc 1.80.0 (051478957 2024-07-21) (Arch Linux rust 1:1.80.0-1) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
thread 'rustc' panicked at library/core/src/panicking.rs:227:5:
panic in a destructor during cleanup

error: the compiler unexpectedly panicked. this is a bug.

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

note: rustc 1.80.0 (051478957 2024-07-21) (Arch Linux rust 1:1.80.0-1) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
thread caused non-unwinding panic. aborting.

Backtrace

stack backtrace:
   0:     0x7f8ecaf4f135 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hdd9ab9b10a59d94d
   1:     0x7f8ecaf9db1b - core::fmt::write::h223fabb34786078a
   2:     0x7f8ecaf4421f - <unknown>
   3:     0x7f8ecaf4ef0e - <unknown>
   4:     0x7f8ecaf51949 - <unknown>
   5:     0x7f8ecaf516ea - std::panicking::default_hook::h2d74591a472105ec
   6:     0x7f8ecb85c21d - <unknown>
   7:     0x7f8ecaf5200b - std::panicking::rust_panic_with_hook::h1d32f519fa4e3a41
   8:     0x7f8ecaf51d84 - <unknown>
   9:     0x7f8ecaf4f5f9 - <unknown>
  10:     0x7f8ecaf51ab7 - rust_begin_unwind
  11:     0x7f8ecaf15a63 - core::panicking::panic_fmt::h3e309476ae0f7f32
  12:     0x7f8ecb775dcd - <unknown>
  13:     0x7f8ece10142d - <unknown>
  14:     0x7f8ece0958ab - <unknown>
  15:     0x7f8ece095088 - <unknown>
  16:     0x7f8ece1b2939 - <unknown>
  17:     0x7f8ece1afbcb - <unknown>
  18:     0x7f8ece1afb3a - <unknown>
  19:     0x7f8ece1a8665 - <rustc_middle[c2835b22a69ac0b4]::ty::generics::GenericPredicates>::instantiate
  20:     0x7f8ecc510283 - <unknown>
  21:     0x7f8ecc50cd94 - <unknown>
  22:     0x7f8ecc521d6f - <unknown>
  23:     0x7f8ecc515509 - rustc_borrowck[ece6d9bbde3e5003]::mir_borrowck
  24:     0x7f8eccde966f - <unknown>
  25:     0x7f8eccf6addc - <unknown>
  26:     0x7f8ecd0903dc - <unknown>
  27:     0x7f8ecce8f425 - <unknown>
  28:     0x7f8ecc648020 - <unknown>
  29:     0x7f8ecc64db6d - <unknown>
  30:     0x7f8ecc65207e - <unknown>
  31:     0x7f8ecc641157 - <unknown>
  32:     0x7f8ecc6c5cb1 - <unknown>
  33:     0x7f8ecc51fe6a - <unknown>
  34:     0x7f8ecc515509 - rustc_borrowck[ece6d9bbde3e5003]::mir_borrowck
  35:     0x7f8eccde966f - <unknown>
  36:     0x7f8eccf6addc - <unknown>
  37:     0x7f8ecd0903dc - <unknown>
  38:     0x7f8ecce8f425 - <unknown>
  39:     0x7f8ecba9ed4f - <unknown>
  40:     0x7f8ecba6107c - <unknown>
  41:     0x7f8ecba9c01e - <unknown>
  42:     0x7f8ecba3c12d - rustc_interface[bf1d2a955b0fbb76]::passes::analysis
  43:     0x7f8eccded4fd - <unknown>
  44:     0x7f8eccfbad29 - <unknown>
  45:     0x7f8ecd03af4f - <unknown>
  46:     0x7f8ecce7ea14 - <unknown>
  47:     0x7f8ecb865103 - <unknown>
  48:     0x7f8ecb834294 - <unknown>
  49:     0x7f8ecb82424c - <unknown>
  50:     0x7f8ecb833ba2 - <unknown>
  51:     0x7f8ecb859366 - <unknown>
  52:     0x7f8ecb82c658 - <unknown>
  53:     0x7f8ecaf5bfeb - <unknown>
  54:     0x7f8ecad7639d - <unknown>
  55:     0x7f8ecadfb49c - <unknown>
  56:                0x0 - <unknown>

[misaka10987]

Note that the following code does not result a crash:

use dashmap::DashMap;

#[derive(PartialEq, Eq, Clone, Copy, Hash)]
pub struct Id(pub &'static str);

// fn f(x: DashMap<Id, ()>) {
//     let id = Id("key");
//     x.view(&id, |k, _| k);
// }

fn g(x: DashMap<&'static str, ()>) {
    x.view(&"key", |k, _| *k);
}

[compiler-errors]

Thanks for the report -- this was fixed in #126884, which will be the next Rust release. We don't typically backport ICE fixes from bad error messages unless they're particularly easy to trigger.