ICE: inherent_associated_types, IOOB, snapshot vec

[matthiaskrgr]

Code

#![feature(inherent_associated_types)]
#![allow(incomplete_features)]

struct Choose<T>(T);

impl<T: Copy> Choose<T> {
    type Result = Vec<T>;
}

fn main() {
    let _: Choose<&str>::Result = vec!["..."];
}

Meta

rustc --version --verbose:

rustc 1.70.0-nightly (900c35403 2023-03-08)
binary: rustc
commit-hash: 900c3540378c8422b8087ffa3db60fa6c8abfcad
commit-date: 2023-03-08
host: x86_64-unknown-linux-gnu
release: 1.70.0-nightly
LLVM version: 15.0.7

Error output

<output>

Backtrace

thread 'rustc' panicked at 'index out of bounds: the len is 1 but the index is 1', /cargo/registry/src/index.crates.io-6f17d22bba15001f/ena-0.14.1/src/snapshot_vec.rs:199:10
stack backtrace:
   0:     0x7f01d069a53a - std::backtrace_rs::backtrace::libunwind::trace::h5499f6e9ee8d39f8
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f01d069a53a - std::backtrace_rs::backtrace::trace_unsynchronized::h7278d8915e5a8a4f
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f01d069a53a - std::sys_common::backtrace::_print_fmt::h0c7e844ccbe54001
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f01d069a53a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h76f2d4fdd5e6ad12
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f01d06fdcee - core::fmt::write::h1775f2c88ef0e3b9
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/core/src/fmt/mod.rs:1232:17
   5:     0x7f01d068d4e5 - std::io::Write::write_fmt::hfa496b0ed0f58ff3
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/io/mod.rs:1684:15
   6:     0x7f01d069a305 - std::sys_common::backtrace::_print::h995e9f70ef8cb7a5
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f01d069a305 - std::sys_common::backtrace::print::he938621c452cca4c
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f01d069d07f - std::panicking::default_hook::{{closure}}::h54a42fdbf61bd63c
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/panicking.rs:271:22
   9:     0x7f01d069cdbb - std::panicking::default_hook::h237f087925386eb9
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/panicking.rs:290:9
  10:     0x7f01cf4586c5 - <rustc_driver_impl[37bd08e570b8de33]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[9f74edcc8a2533f5]::ops::function::FnOnce<(&core[9f74edcc8a2533f5]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7f01d069d8bd - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h86b8a5cdb22895d8
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/alloc/src/boxed.rs:2001:9
  12:     0x7f01d069d8bd - std::panicking::rust_panic_with_hook::h3b3e70d6d2eb55f8
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/panicking.rs:696:13
  13:     0x7f01d069d639 - std::panicking::begin_panic_handler::{{closure}}::hdb26ba8feb23c2d0
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/panicking.rs:583:13
  14:     0x7f01d069a9a6 - std::sys_common::backtrace::__rust_end_short_backtrace::heb4e04cb16e3e639
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/sys_common/backtrace.rs:150:18
  15:     0x7f01d069d342 - rust_begin_unwind
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/panicking.rs:579:5
  16:     0x7f01d06fa043 - core::panicking::panic_fmt::h1aa26efd95b582e6
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/core/src/panicking.rs:64:14
  17:     0x7f01d06fa232 - core::panicking::panic_bounds_check::hd383b5be85d8fc1f
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/core/src/panicking.rs:159:5
  18:     0x7f01cd427670 - <ena[f706e7040a3ba6fd]::unify::UnificationTable<ena[f706e7040a3ba6fd]::unify::backing_vec::InPlace<rustc_middle[d952a4eb3363976b]::infer::unify_key::RegionVidKey, &mut alloc[c1cc857fc123d71]::vec::Vec<ena[f706e7040a3ba6fd]::unify::VarValue<rustc_middle[d952a4eb3363976b]::infer::unify_key::RegionVidKey>>, &mut rustc_infer[4dafefd086b6e2df]::infer::undo_log::InferCtxtUndoLogs>>>::uninlined_get_root_key
  19:     0x7f01cd476646 - <rustc_infer[4dafefd086b6e2df]::infer::canonical::canonicalizer::Canonicalizer as rustc_type_ir[4eed4d3f2d6a64c6]::fold::TypeFolder<rustc_middle[d952a4eb3363976b]::ty::context::TyCtxt>>::fold_ty
  20:     0x7f01cd476a17 - <rustc_infer[4dafefd086b6e2df]::infer::canonical::canonicalizer::Canonicalizer as rustc_type_ir[4eed4d3f2d6a64c6]::fold::TypeFolder<rustc_middle[d952a4eb3363976b]::ty::context::TyCtxt>>::fold_ty
  21:     0x7f01cd87cc19 - <rustc_infer[4dafefd086b6e2df]::infer::InferCtxt>::canonicalize_user_type_annotation::<rustc_middle[d952a4eb3363976b]::ty::typeck_results::UserType>
  22:     0x7f01cd4fcd92 - <rustc_hir_typeck[ff4503d8c995715b]::gather_locals::GatherLocalsVisitor as rustc_hir[829d2a01d5dbcc01]::intravisit::Visitor>::visit_local
  23:     0x7f01cd4fcb1d - <rustc_hir_typeck[ff4503d8c995715b]::gather_locals::GatherLocalsVisitor as rustc_hir[829d2a01d5dbcc01]::intravisit::Visitor>::visit_expr
  24:     0x7f01ce375d2e - rustc_hir_typeck[ff4503d8c995715b]::check::check_fn
  25:     0x7f01ce35dd38 - rustc_hir_typeck[ff4503d8c995715b]::typeck
  26:     0x7f01ce4234ec - rustc_query_system[bc9882aaabdaeb26]::query::plumbing::try_execute_query::<rustc_query_impl[d542d75c076a29bb]::queries::typeck, rustc_query_impl[d542d75c076a29bb]::plumbing::QueryCtxt>
  27:     0x7f01cebfca7f - rustc_data_structures[1a1e0f92f2f67e98]::sync::par_for_each_in::<&[rustc_span[312e5fbb5d1460ce]::def_id::LocalDefId], <rustc_middle[d952a4eb3363976b]::hir::map::Map>::par_body_owners<rustc_hir_typeck[ff4503d8c995715b]::typeck_item_bodies::{closure#0}>::{closure#0}>
  28:     0x7f01cebfc83f - rustc_hir_typeck[ff4503d8c995715b]::typeck_item_bodies
  29:     0x7f01cea93ffd - rustc_query_system[bc9882aaabdaeb26]::query::plumbing::try_execute_query::<rustc_query_impl[d542d75c076a29bb]::queries::typeck_item_bodies, rustc_query_impl[d542d75c076a29bb]::plumbing::QueryCtxt>
  30:     0x7f01cea93ceb - <rustc_query_impl[d542d75c076a29bb]::Queries as rustc_middle[d952a4eb3363976b]::ty::query::QueryEngine>::typeck_item_bodies
  31:     0x7f01cd8d1f73 - <rustc_session[ba04d21bdf852ac2]::session::Session>::time::<(), rustc_hir_analysis[db450ef6184d9cb6]::check_crate::{closure#7}>
  32:     0x7f01cd8ce9fd - rustc_hir_analysis[db450ef6184d9cb6]::check_crate
  33:     0x7f01cd8c48e2 - rustc_interface[b840461aee9fca96]::passes::analysis
  34:     0x7f01cec8045d - rustc_query_system[bc9882aaabdaeb26]::query::plumbing::try_execute_query::<rustc_query_impl[d542d75c076a29bb]::queries::analysis, rustc_query_impl[d542d75c076a29bb]::plumbing::QueryCtxt>
  35:     0x7f01cec8015f - <rustc_query_impl[d542d75c076a29bb]::Queries as rustc_middle[d952a4eb3363976b]::ty::query::QueryEngine>::analysis
  36:     0x7f01ceabe0d6 - <rustc_middle[d952a4eb3363976b]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[37bd08e570b8de33]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>>
  37:     0x7f01ce6ae858 - rustc_span[312e5fbb5d1460ce]::with_source_map::<core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>, rustc_interface[b840461aee9fca96]::interface::run_compiler<core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>, rustc_driver_impl[37bd08e570b8de33]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  38:     0x7f01ce6a5fec - std[76763ff83cd4f414]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[b840461aee9fca96]::util::run_in_thread_pool_with_globals<rustc_interface[b840461aee9fca96]::interface::run_compiler<core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>, rustc_driver_impl[37bd08e570b8de33]::run_compiler::{closure#1}>::{closure#0}, core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>>
  39:     0x7f01ce6a5a1a - <<std[76763ff83cd4f414]::thread::Builder>::spawn_unchecked_<rustc_interface[b840461aee9fca96]::util::run_in_thread_pool_with_globals<rustc_interface[b840461aee9fca96]::interface::run_compiler<core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>, rustc_driver_impl[37bd08e570b8de33]::run_compiler::{closure#1}>::{closure#0}, core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[9f74edcc8a2533f5]::result::Result<(), rustc_span[312e5fbb5d1460ce]::ErrorGuaranteed>>::{closure#1} as core[9f74edcc8a2533f5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  40:     0x7f01d06a77b3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2d50a0adfdb2874f
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/alloc/src/boxed.rs:1987:9
  41:     0x7f01d06a77b3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7afed2ea646a4458
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/alloc/src/boxed.rs:1987:9
  42:     0x7f01d06a77b3 - std::sys::unix::thread::Thread::new::thread_start::h950100cbea36de7e
                               at /rustc/900c3540378c8422b8087ffa3db60fa6c8abfcad/library/std/src/sys/unix/thread.rs:108:17
  43:     0x7f01cc056bb5 - <unknown>
  44:     0x7f01cc0d8d90 - <unknown>
  45:                0x0 - <unknown>

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 1.70.0-nightly (900c35403 2023-03-08) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `main`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack

[fmease]

Thanks for reporting! I see you took parts of an earlier version of UI test associated-inherent-types/dispatch-on-self-type-0.rs (found in one iteration of #105961) which I had modified precisely because of this ICE, haha. I'm more than aware of this ICE and it's already fixed in a local version of rustc which I am still working on but which I will make public soon.

@rustbot claim

[matthiaskrgr]

Oh.. 😄
I grepped in the repo and for let _: Choose<&str>::Result = vec!["..."]; and couldn't find any file checked in currently.

Im running rustc on an older repo of itself and cut away the unneeded code from the example.

[fmease]

I grepped in the repo […] and couldn't find any file checked in currently.

Right, that's true. The old version with &str does not exist on master. The new version contains bool instead (no pesky unsolved inference variables 😝).

No worries at all, it's great that you created an issue, I just didn't feel the need to report it as I am actively working on IATs and since I know of several other shortcomings / bugs that are not tracked in GitHub issues but instead mostly in FIXMEs or known-bug UI tests (and a few in my head 😬).