ICE: `type variables should not be hashed: _#0t`

[matthiaskrgr]

Code

struct Wrapper<T>(T);

struct Local<T, U>(T, U);

impl<T> Local {
    type AssocType3 = T;

    const WRAPPED_ASSOC_3: Wrapper<Self::AssocType3> = Wrapper();
}

Meta

rustc --version --verbose:

rustc 1.70.0-nightly (17c116721 2023-03-29)
binary: rustc
commit-hash: 17c11672167827b0dd92c88ef69f24346d1286dd
commit-date: 2023-03-29
host: x86_64-unknown-linux-gnu
release: 1.70.0-nightly
LLVM version: 16.0.0

Bisection points to

searched toolchains 7aa413d59206fd511137728df3d9e0fd377429bd through 5243ea5c29b136137c36bd773e5baa663790e097


********************************************************************************
Regression in 7b552967b8ed122aa949cddac8c2270b6490e64e
*******************************************************************************

#105961 cc @fmease

Error output

rustc /tmp/im/treereduce.out -Cincremental=.

error[E0601]: `main` function not found in crate `treereduce`
 --> /tmp/im/treereduce.out:9:2
  |
9 | }
  |  ^ consider adding a `main` function to `/tmp/im/treereduce.out`

error[E0107]: missing generics for struct `Local`
 --> /tmp/im/treereduce.out:5:9
  |
5 | impl<T> Local {
  |         ^^^^^ expected 2 generic arguments
  |
note: struct defined here, with 2 generic parameters: `T`, `U`
 --> /tmp/im/treereduce.out:3:8
  |
3 | struct Local<T, U>(T, U);
  |        ^^^^^ -  -
help: add missing generic arguments
  |
5 | impl<T> Local<T, U> {
  |              ++++++

error[E0658]: inherent associated types are unstable
 --> /tmp/im/treereduce.out:6:5
  |
6 |     type AssocType3 = T;
  |     ^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
  = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable

Backtrace

thread 'rustc' panicked at 'type variables should not be hashed: _#0t', /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/compiler/rustc_type_ir/src/lib.rs:718:17
stack backtrace:
   0:     0x7ff5b4b65e8a - std::backtrace_rs::backtrace::libunwind::trace::hc07ec51854030801
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7ff5b4b65e8a - std::backtrace_rs::backtrace::trace_unsynchronized::hd5249f53d09c2c41
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7ff5b4b65e8a - std::sys_common::backtrace::_print_fmt::h7a58bb30aee44196
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7ff5b4b65e8a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h4f2b7c295e3f8019
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7ff5b4bc9e6f - core::fmt::write::h10777037b979b8b8
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/core/src/fmt/mod.rs:1254:17
   5:     0x7ff5b4b58ac5 - std::io::Write::write_fmt::he1dc4aa4bd2563db
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/io/mod.rs:1698:15
   6:     0x7ff5b4b65c55 - std::sys_common::backtrace::_print::h163c7799d3150ce8
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7ff5b4b65c55 - std::sys_common::backtrace::print::h3cf13564ddfd5c0e
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7ff5b4b688fe - std::panicking::default_hook::{{closure}}::h999811fec35f64bf
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/panicking.rs:269:22
   9:     0x7ff5b4b686a5 - std::panicking::default_hook::he182d48ca482e8b2
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/panicking.rs:288:9
  10:     0x7ff5b7e8bfe5 - <rustc_driver_impl[97cc8afb29750871]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[a19e7c0c634483f1]::ops::function::FnOnce<(&core[a19e7c0c634483f1]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7ff5b4b690f4 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h85e02727d0be9156
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/alloc/src/boxed.rs:2002:9
  12:     0x7ff5b4b690f4 - std::panicking::rust_panic_with_hook::h2bc066147eaf9845
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/panicking.rs:694:13
  13:     0x7ff5b4b68e69 - std::panicking::begin_panic_handler::{{closure}}::h1e4368c427832fe9
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/panicking.rs:581:13
  14:     0x7ff5b4b662f6 - std::sys_common::backtrace::__rust_end_short_backtrace::h5466480ef33b438e
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/sys_common/backtrace.rs:150:18
  15:     0x7ff5b4b68bc2 - rust_begin_unwind
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/panicking.rs:577:5
  16:     0x7ff5b4bc6273 - core::panicking::panic_fmt::ha28b6d803d12671b
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/core/src/panicking.rs:67:14
  17:     0x7ff5b838ff0b - <rustc_type_ir[45884c32f46deb2e]::InferTy as rustc_data_structures[cd2fe1ee8a53a3e]::stable_hasher::HashStable<rustc_query_system[1d2d9265d336f3ba]::ich::hcx::StableHashingContext>>::hash_stable
  18:     0x7ff5b5de669e - <rustc_type_ir[45884c32f46deb2e]::ty_info::WithCachedTypeInfo<rustc_type_ir[45884c32f46deb2e]::sty::TyKind<rustc_middle[3082ae73db43cedc]::ty::context::TyCtxt>> as rustc_data_structures[cd2fe1ee8a53a3e]::stable_hasher::HashStable<rustc_query_system[1d2d9265d336f3ba]::ich::hcx::StableHashingContext>>::hash_stable
  19:     0x7ff5b659fe4c - <&rustc_middle[3082ae73db43cedc]::ty::list::List<rustc_middle[3082ae73db43cedc]::ty::subst::GenericArg> as rustc_data_structures[cd2fe1ee8a53a3e]::stable_hasher::HashStable<rustc_query_system[1d2d9265d336f3ba]::ich::hcx::StableHashingContext>>::hash_stable
  20:     0x7ff5b5fbfd01 - <rustc_type_ir[45884c32f46deb2e]::ty_info::WithCachedTypeInfo<rustc_type_ir[45884c32f46deb2e]::sty::TyKind<rustc_middle[3082ae73db43cedc]::ty::context::TyCtxt>> as rustc_data_structures[cd2fe1ee8a53a3e]::stable_hasher::HashStable<rustc_query_system[1d2d9265d336f3ba]::ich::hcx::StableHashingContext>>::hash_stable
  21:     0x7ff5b64edcb3 - rustc_query_system[1d2d9265d336f3ba]::dep_graph::graph::hash_result::<rustc_middle[3082ae73db43cedc]::ty::subst::EarlyBinder<rustc_middle[3082ae73db43cedc]::ty::Ty>>
  22:     0x7ff5b64ed685 - <std[6ff7f37a454f70cc]::thread::local::LocalKey<core[a19e7c0c634483f1]::cell::Cell<*const ()>>>::with::<rustc_middle[3082ae73db43cedc]::ty::context::tls::enter_context<rustc_query_system[1d2d9265d336f3ba]::query::plumbing::execute_job_incr<rustc_query_impl[7fc8fbd6a7380a6b]::queries::type_of, rustc_query_impl[7fc8fbd6a7380a6b]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[3082ae73db43cedc]::ty::subst::EarlyBinder<rustc_middle[3082ae73db43cedc]::ty::Ty>, rustc_query_system[1d2d9265d336f3ba]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[3082ae73db43cedc]::ty::subst::EarlyBinder<rustc_middle[3082ae73db43cedc]::ty::Ty>, rustc_query_system[1d2d9265d336f3ba]::dep_graph::graph::DepNodeIndex)>
  23:     0x7ff5b64ebf98 - rustc_query_system[1d2d9265d336f3ba]::query::plumbing::try_execute_query::<rustc_query_impl[7fc8fbd6a7380a6b]::queries::type_of, rustc_query_impl[7fc8fbd6a7380a6b]::plumbing::QueryCtxt>
  24:     0x7ff5b643fbb6 - <rustc_hir_analysis[765c0daf36b03a69]::collect::CollectItemTypesVisitor as rustc_hir[c06c39e7dae5b071]::intravisit::Visitor>::visit_impl_item
  25:     0x7ff5b643ab7e - <rustc_middle[3082ae73db43cedc]::hir::map::Map>::visit_item_likes_in_module::<rustc_hir_analysis[765c0daf36b03a69]::collect::CollectItemTypesVisitor>
  26:     0x7ff5b643aa0c - rustc_hir_analysis[765c0daf36b03a69]::collect::collect_mod_item_types
  27:     0x7ff5b7484cc2 - <std[6ff7f37a454f70cc]::thread::local::LocalKey<core[a19e7c0c634483f1]::cell::Cell<*const ()>>>::with::<rustc_middle[3082ae73db43cedc]::ty::context::tls::enter_context<rustc_query_system[1d2d9265d336f3ba]::query::plumbing::execute_job_incr<rustc_query_impl[7fc8fbd6a7380a6b]::queries::collect_mod_item_types, rustc_query_impl[7fc8fbd6a7380a6b]::plumbing::QueryCtxt>::{closure#2}, ((), rustc_query_system[1d2d9265d336f3ba]::dep_graph::graph::DepNodeIndex)>::{closure#0}, ((), rustc_query_system[1d2d9265d336f3ba]::dep_graph::graph::DepNodeIndex)>
  28:     0x7ff5b748461d - rustc_query_system[1d2d9265d336f3ba]::query::plumbing::try_execute_query::<rustc_query_impl[7fc8fbd6a7380a6b]::queries::collect_mod_item_types, rustc_query_impl[7fc8fbd6a7380a6b]::plumbing::QueryCtxt>
  29:     0x7ff5b7484039 - <rustc_query_impl[7fc8fbd6a7380a6b]::Queries as rustc_middle[3082ae73db43cedc]::ty::query::QueryEngine>::collect_mod_item_types
  30:     0x7ff5b72ed83f - <rustc_session[cf9a7d3e591cdb18]::session::Session>::track_errors::<rustc_hir_analysis[765c0daf36b03a69]::check_crate::{closure#0}, ()>
  31:     0x7ff5b72e9ec1 - rustc_hir_analysis[765c0daf36b03a69]::check_crate
  32:     0x7ff5b72e3dd1 - rustc_interface[5bf2b96a334089ac]::passes::analysis
  33:     0x7ff5b76434ca - <std[6ff7f37a454f70cc]::thread::local::LocalKey<core[a19e7c0c634483f1]::cell::Cell<*const ()>>>::with::<rustc_middle[3082ae73db43cedc]::ty::context::tls::enter_context<rustc_query_system[1d2d9265d336f3ba]::query::plumbing::execute_job_incr<rustc_query_impl[7fc8fbd6a7380a6b]::queries::analysis, rustc_query_impl[7fc8fbd6a7380a6b]::plumbing::QueryCtxt>::{closure#2}, (core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>, rustc_query_system[1d2d9265d336f3ba]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>, rustc_query_system[1d2d9265d336f3ba]::dep_graph::graph::DepNodeIndex)>
  34:     0x7ff5b764301f - rustc_query_system[1d2d9265d336f3ba]::query::plumbing::try_execute_query::<rustc_query_impl[7fc8fbd6a7380a6b]::queries::analysis, rustc_query_impl[7fc8fbd6a7380a6b]::plumbing::QueryCtxt>
  35:     0x7ff5b7642b80 - <rustc_query_impl[7fc8fbd6a7380a6b]::Queries as rustc_middle[3082ae73db43cedc]::ty::query::QueryEngine>::analysis
  36:     0x7ff5b6fe12be - <rustc_interface[5bf2b96a334089ac]::queries::QueryResult<&rustc_middle[3082ae73db43cedc]::ty::context::GlobalCtxt>>::enter::<core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>, rustc_driver_impl[97cc8afb29750871]::run_compiler::{closure#1}::{closure#2}::{closure#4}>
  37:     0x7ff5b6fdfe5e - <rustc_interface[5bf2b96a334089ac]::interface::Compiler>::enter::<rustc_driver_impl[97cc8afb29750871]::run_compiler::{closure#1}::{closure#2}, core[a19e7c0c634483f1]::result::Result<core[a19e7c0c634483f1]::option::Option<rustc_interface[5bf2b96a334089ac]::queries::Linker>, rustc_span[e810f079a636b72c]::ErrorGuaranteed>>
  38:     0x7ff5b6fde011 - rustc_span[e810f079a636b72c]::with_source_map::<core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>, rustc_interface[5bf2b96a334089ac]::interface::run_compiler<core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>, rustc_driver_impl[97cc8afb29750871]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  39:     0x7ff5b6fdd5bf - std[6ff7f37a454f70cc]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5bf2b96a334089ac]::util::run_in_thread_pool_with_globals<rustc_interface[5bf2b96a334089ac]::interface::run_compiler<core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>, rustc_driver_impl[97cc8afb29750871]::run_compiler::{closure#1}>::{closure#0}, core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>>
  40:     0x7ff5b772084e - <<std[6ff7f37a454f70cc]::thread::Builder>::spawn_unchecked_<rustc_interface[5bf2b96a334089ac]::util::run_in_thread_pool_with_globals<rustc_interface[5bf2b96a334089ac]::interface::run_compiler<core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>, rustc_driver_impl[97cc8afb29750871]::run_compiler::{closure#1}>::{closure#0}, core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[a19e7c0c634483f1]::result::Result<(), rustc_span[e810f079a636b72c]::ErrorGuaranteed>>::{closure#1} as core[a19e7c0c634483f1]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  41:     0x7ff5b4b731d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hfe54f4b2f7bbb15c
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/alloc/src/boxed.rs:1988:9
  42:     0x7ff5b4b731d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h63491a9a6e102885
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/alloc/src/boxed.rs:1988:9
  43:     0x7ff5b4b731d5 - std::sys::unix::thread::Thread::new::thread_start::h7f7d825730b043c8
                               at /rustc/17c11672167827b0dd92c88ef69f24346d1286dd/library/std/src/sys/unix/thread.rs:108:17
  44:     0x7ff5b490dbb5 - <unknown>
  45:     0x7ff5b498fd90 - <unknown>
  46:                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 (17c116721 2023-03-29) running on x86_64-unknown-linux-gnu

note: compiler flags: -C incremental=[REDACTED]

query stack during panic:
#0 [type_of] computing type of `<impl at /tmp/im/treereduce.out:5:1: 5:14>::WRAPPED_ASSOC_3`
#1 [collect_mod_item_types] collecting item types in top-level module
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0107, E0601, E0658.
For more information about an error, try `rustc --explain E0107`.

[fmease]

Should already be fixed in #109410, let me check. Edit: It is. Gonna push a regression test later.
@rustbot claim

[fmease]

Regression test added.

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-medium