ICE: `type variables should not be hashed: _#0t` -Cincremental=tmp

[matthiaskrgr]

Code

pub fn encode_num<Writer: ExampleWriter>(n: u32, mut writer: Writer) -> Result<(), Writer::Error> {
    if n > 15 {
        encode_num(n / 16, &mut writer)?;
    }
    Ok(())
}

pub trait ExampleWriter {
    type Error;
}

impl<'a, T: ExampleWriter> ExampleWriter for &'a mut T {
    type Error = T::Error;
}

struct Error;

impl ExampleWriter for Error {
    type Error = ();
}

fn main() {
    encode_num(69, &mut Error).unwrap();
}

Meta

rustc --version --verbose:

rustc 1.68.0-nightly (d0dc9efff 2022-12-18)
binary: rustc
commit-hash: d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0
commit-date: 2022-12-18
host: x86_64-unknown-linux-gnu
release: 1.68.0-nightly
LLVM version: 15.0.6

Error output

Backtrace

thread 'rustc' panicked at 'type variables should not be hashed: _#0t', /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/compiler/rustc_type_ir/src/lib.rs:681:17
stack backtrace:
   0:     0x7f9884828a7a - std::backtrace_rs::backtrace::libunwind::trace::h196c489280b5a090
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f9884828a7a - std::backtrace_rs::backtrace::trace_unsynchronized::h13bf778637c29636
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f9884828a7a - std::sys_common::backtrace::_print_fmt::h0f4861fc71bccacd
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f9884828a7a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5f011e3cd484ad42
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f988488b7ae - core::fmt::write::h1524a82fa967022b
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f9884818e45 - std::io::Write::write_fmt::ha3d33adc534ae39a
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/io/mod.rs:1682:15
   6:     0x7f9884828845 - std::sys_common::backtrace::_print::h11f95f719c502811
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f9884828845 - std::sys_common::backtrace::print::h71adea94b47d00ae
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f988482b58f - std::panicking::default_hook::{{closure}}::he466417f162d07e8
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/panicking.rs:267:22
   9:     0x7f988482b2cb - std::panicking::default_hook::hff6ac2c6adb87df1
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/panicking.rs:286:9
  10:     0x7f988364b261 - <rustc_driver[308d730545d14786]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[cf0a937d1125fa47]::ops::function::FnOnce<(&core[cf0a937d1125fa47]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7f988482bdcd - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h50ec27c76f2a595f
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/alloc/src/boxed.rs:2032:9
  12:     0x7f988482bdcd - std::panicking::rust_panic_with_hook::hcb61d2700034f188
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/panicking.rs:692:13
  13:     0x7f988482bb49 - std::panicking::begin_panic_handler::{{closure}}::h44457d7d7214b4ef
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/panicking.rs:579:13
  14:     0x7f9884828f2c - std::sys_common::backtrace::__rust_end_short_backtrace::hf4f789a62590af34
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/sys_common/backtrace.rs:137:18
  15:     0x7f988482b852 - rust_begin_unwind
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/panicking.rs:575:5
  16:     0x7f9884888193 - core::panicking::panic_fmt::h19d66e5282d7808f
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/core/src/panicking.rs:64:14
  17:     0x7f9883b32667 - <rustc_type_ir[caa31f9d30499ec4]::InferTy as rustc_data_structures[303ffdc98c2c3200]::stable_hasher::HashStable<rustc_query_system[3cfc2c8ad6a9fb05]::ich::hcx::StableHashingContext>>::hash_stable
  18:     0x7f98815ce886 - <rustc_data_structures[303ffdc98c2c3200]::intern::Interned<rustc_type_ir[caa31f9d30499ec4]::ty_info::WithCachedTypeInfo<rustc_type_ir[caa31f9d30499ec4]::sty::TyKind<rustc_middle[3f796d6b9d25fb15]::ty::context::TyCtxt>>> as rustc_data_structures[303ffdc98c2c3200]::stable_hasher::HashStable<rustc_query_system[3cfc2c8ad6a9fb05]::ich::hcx::StableHashingContext>>::hash_stable
  19:     0x7f98815cf426 - <&rustc_middle[3f796d6b9d25fb15]::ty::list::List<rustc_middle[3f796d6b9d25fb15]::ty::subst::GenericArg> as rustc_data_structures[303ffdc98c2c3200]::stable_hasher::HashStable<rustc_query_system[3cfc2c8ad6a9fb05]::ich::hcx::StableHashingContext>>::hash_stable
  20:     0x7f98815ce04a - <rustc_data_structures[303ffdc98c2c3200]::intern::Interned<rustc_type_ir[caa31f9d30499ec4]::ty_info::WithCachedTypeInfo<rustc_type_ir[caa31f9d30499ec4]::sty::TyKind<rustc_middle[3f796d6b9d25fb15]::ty::context::TyCtxt>>> as rustc_data_structures[303ffdc98c2c3200]::stable_hasher::HashStable<rustc_query_system[3cfc2c8ad6a9fb05]::ich::hcx::StableHashingContext>>::hash_stable
  21:     0x7f98815cf426 - <&rustc_middle[3f796d6b9d25fb15]::ty::list::List<rustc_middle[3f796d6b9d25fb15]::ty::subst::GenericArg> as rustc_data_structures[303ffdc98c2c3200]::stable_hasher::HashStable<rustc_query_system[3cfc2c8ad6a9fb05]::ich::hcx::StableHashingContext>>::hash_stable
  22:     0x7f98815ce04a - <rustc_data_structures[303ffdc98c2c3200]::intern::Interned<rustc_type_ir[caa31f9d30499ec4]::ty_info::WithCachedTypeInfo<rustc_type_ir[caa31f9d30499ec4]::sty::TyKind<rustc_middle[3f796d6b9d25fb15]::ty::context::TyCtxt>>> as rustc_data_structures[303ffdc98c2c3200]::stable_hasher::HashStable<rustc_query_system[3cfc2c8ad6a9fb05]::ich::hcx::StableHashingContext>>::hash_stable
  23:     0x7f98824c5933 - rustc_query_system[3cfc2c8ad6a9fb05]::dep_graph::graph::hash_result::<core[cf0a937d1125fa47]::result::Result<rustc_middle[3f796d6b9d25fb15]::ty::subst::GenericArg, rustc_middle[3f796d6b9d25fb15]::traits::query::NoSolution>>
  24:     0x7f98824c5561 - <rustc_query_system[3cfc2c8ad6a9fb05]::dep_graph::graph::DepGraph<rustc_middle[3f796d6b9d25fb15]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[3f796d6b9d25fb15]::ty::context::TyCtxt, rustc_middle[3f796d6b9d25fb15]::ty::ParamEnvAnd<rustc_middle[3f796d6b9d25fb15]::ty::subst::GenericArg>, core[cf0a937d1125fa47]::result::Result<rustc_middle[3f796d6b9d25fb15]::ty::subst::GenericArg, rustc_middle[3f796d6b9d25fb15]::traits::query::NoSolution>>
  25:     0x7f98824c4048 - rustc_query_system[3cfc2c8ad6a9fb05]::query::plumbing::try_execute_query::<rustc_query_impl[e92d44e4580ccfd4]::plumbing::QueryCtxt, rustc_query_system[3cfc2c8ad6a9fb05]::query::caches::DefaultCache<rustc_middle[3f796d6b9d25fb15]::ty::ParamEnvAnd<rustc_middle[3f796d6b9d25fb15]::ty::subst::GenericArg>, core[cf0a937d1125fa47]::result::Result<rustc_middle[3f796d6b9d25fb15]::ty::subst::GenericArg, rustc_middle[3f796d6b9d25fb15]::traits::query::NoSolution>>>
  26:     0x7f9881755669 - <rustc_middle[3f796d6b9d25fb15]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_middle[3f796d6b9d25fb15]::ty::fold::TypeFolder>::fold_ty
  27:     0x7f9881ff441a - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_neighbours
  28:     0x7f9881fec18b - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  29:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  30:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  31:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  32:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  33:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  34:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  35:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  36:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  37:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  38:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  39:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  40:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  41:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  42:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  43:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  44:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  45:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  46:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  47:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  48:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  49:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  50:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  51:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  52:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  53:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  54:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
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  56:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  57:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  58:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  59:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  60:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  61:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  62:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  63:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  64:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
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  70:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  71:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
  72:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
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  87:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
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 128:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 129:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 130:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 131:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 132:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 133:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 134:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 135:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 136:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 137:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 138:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 139:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 140:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 141:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 142:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 143:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 144:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 145:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 146:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 147:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 148:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 149:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 150:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 151:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 152:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 153:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 154:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 155:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 156:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 157:     0x7f9881fec5fc - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_items_rec
 158:     0x7f98826b7f2a - rustc_data_structures[303ffdc98c2c3200]::sync::par_for_each_in::<alloc[e89cf99e2daa46aa]::vec::Vec<rustc_middle[3f796d6b9d25fb15]::mir::mono::MonoItem>, rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>
 159:     0x7f98826b7d50 - <rustc_session[285c9883f1e66712]::session::Session>::time::<(), rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_crate_mono_items::{closure#1}>
 160:     0x7f98826b7954 - rustc_monomorphize[a4cc943ce47e6fdd]::collector::collect_crate_mono_items
 161:     0x7f98826b5e92 - rustc_monomorphize[a4cc943ce47e6fdd]::partitioning::collect_and_partition_mono_items
 162:     0x7f9882dd53b9 - <rustc_query_system[3cfc2c8ad6a9fb05]::dep_graph::graph::DepGraph<rustc_middle[3f796d6b9d25fb15]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[3f796d6b9d25fb15]::ty::context::TyCtxt, (), (&std[645413f22396c11]::collections::hash::set::HashSet<rustc_span[7195c1839470b4e2]::def_id::DefId, core[cf0a937d1125fa47]::hash::BuildHasherDefault<rustc_hash[f71d5c84367782f5]::FxHasher>>, &[rustc_middle[3f796d6b9d25fb15]::mir::mono::CodegenUnit])>
 163:     0x7f9882dd4383 - rustc_query_system[3cfc2c8ad6a9fb05]::query::plumbing::try_execute_query::<rustc_query_impl[e92d44e4580ccfd4]::plumbing::QueryCtxt, rustc_query_system[3cfc2c8ad6a9fb05]::query::caches::DefaultCache<(), (&std[645413f22396c11]::collections::hash::set::HashSet<rustc_span[7195c1839470b4e2]::def_id::DefId, core[cf0a937d1125fa47]::hash::BuildHasherDefault<rustc_hash[f71d5c84367782f5]::FxHasher>>, &[rustc_middle[3f796d6b9d25fb15]::mir::mono::CodegenUnit])>>
 164:     0x7f9882dd3cf4 - rustc_query_system[3cfc2c8ad6a9fb05]::query::plumbing::get_query::<rustc_query_impl[e92d44e4580ccfd4]::queries::collect_and_partition_mono_items, rustc_query_impl[e92d44e4580ccfd4]::plumbing::QueryCtxt>
 165:     0x7f9882dd3c2e - <rustc_query_impl[e92d44e4580ccfd4]::Queries as rustc_middle[3f796d6b9d25fb15]::ty::query::QueryEngine>::collect_and_partition_mono_items
 166:     0x7f9882cd772b - rustc_codegen_ssa[833d31b763ae114d]::base::codegen_crate::<rustc_codegen_llvm[a48ef6c2d8d93bca]::LlvmCodegenBackend>
 167:     0x7f9882cd74d9 - <rustc_codegen_llvm[a48ef6c2d8d93bca]::LlvmCodegenBackend as rustc_codegen_ssa[833d31b763ae114d]::traits::backend::CodegenBackend>::codegen_crate
 168:     0x7f98828da611 - <rustc_session[285c9883f1e66712]::session::Session>::time::<alloc[e89cf99e2daa46aa]::boxed::Box<dyn core[cf0a937d1125fa47]::any::Any>, rustc_interface[ef42ad965cd11b9c]::passes::start_codegen::{closure#0}>
 169:     0x7f98828da139 - rustc_interface[ef42ad965cd11b9c]::passes::start_codegen
 170:     0x7f98828d7e36 - <rustc_interface[ef42ad965cd11b9c]::passes::QueryContext>::enter::<<rustc_interface[ef42ad965cd11b9c]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[cf0a937d1125fa47]::result::Result<alloc[e89cf99e2daa46aa]::boxed::Box<dyn core[cf0a937d1125fa47]::any::Any>, rustc_errors[3067a2436b21c54]::ErrorGuaranteed>>
 171:     0x7f98828d52e6 - <rustc_interface[ef42ad965cd11b9c]::queries::Queries>::ongoing_codegen
 172:     0x7f98828d4807 - <rustc_interface[ef42ad965cd11b9c]::interface::Compiler>::enter::<rustc_driver[308d730545d14786]::run_compiler::{closure#1}::{closure#2}, core[cf0a937d1125fa47]::result::Result<core[cf0a937d1125fa47]::option::Option<rustc_interface[ef42ad965cd11b9c]::queries::Linker>, rustc_errors[3067a2436b21c54]::ErrorGuaranteed>>
 173:     0x7f98828cf7e8 - rustc_span[7195c1839470b4e2]::with_source_map::<core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>, rustc_interface[ef42ad965cd11b9c]::interface::run_compiler<core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>, rustc_driver[308d730545d14786]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
 174:     0x7f98828cf2d5 - <scoped_tls[39b0712e649d5f34]::ScopedKey<rustc_span[7195c1839470b4e2]::SessionGlobals>>::set::<rustc_interface[ef42ad965cd11b9c]::interface::run_compiler<core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>, rustc_driver[308d730545d14786]::run_compiler::{closure#1}>::{closure#0}, core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>>
 175:     0x7f98828ce8c2 - std[645413f22396c11]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ef42ad965cd11b9c]::util::run_in_thread_pool_with_globals<rustc_interface[ef42ad965cd11b9c]::interface::run_compiler<core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>, rustc_driver[308d730545d14786]::run_compiler::{closure#1}>::{closure#0}, core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>>
 176:     0x7f9882f0827a - <<std[645413f22396c11]::thread::Builder>::spawn_unchecked_<rustc_interface[ef42ad965cd11b9c]::util::run_in_thread_pool_with_globals<rustc_interface[ef42ad965cd11b9c]::interface::run_compiler<core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>, rustc_driver[308d730545d14786]::run_compiler::{closure#1}>::{closure#0}, core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[cf0a937d1125fa47]::result::Result<(), rustc_errors[3067a2436b21c54]::ErrorGuaranteed>>::{closure#1} as core[cf0a937d1125fa47]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
 177:     0x7f9884835dc3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hfa728446fdf5ae93
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/alloc/src/boxed.rs:2000:9
 178:     0x7f9884835dc3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3934f485a9254b50
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/alloc/src/boxed.rs:2000:9
 179:     0x7f9884835dc3 - std::sys::unix::thread::Thread::new::thread_start::he535d9cd9ed14925
                               at /rustc/d0dc9efff14ac0a1eeceffd1e605e37eeb8362a0/library/std/src/sys/unix/thread.rs:108:17
 180:     0x7f98802658fd - <unknown>
 181:     0x7f98802e7a60 - <unknown>
 182:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: 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 1.68.0-nightly (d0dc9efff 2022-12-18) running on x86_64-unknown-linux-gnu

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

query stack during panic:
#0 [try_normalize_generic_arg_after_erasing_regions] normalizing `fn(core::result::Result<(), <&mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut Error as ExampleWriter>::Error>) -> core::ops::control_flow::ControlFlow<<core::result::Result<(), <&mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut Error as ExampleWriter>::Error> as core::ops::try_trait::Try>::Residual, <core::result::Result<(), <&mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut Error as ExampleWriter>::Error> as core::ops::try_trait::Try>::Output> {<core::result::Result<(), <&mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut Error as ExampleWriter>::Error> as core::ops::try_trait::Try>::branch}`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack

[compiler-errors]

Doesn't this example already ICE without incremental? It looks like a duplicate of another one I already mentioned was a duplicate..

[matthiaskrgr]

Ah I thought that the incremental crash was new but it apparently isn't (also repros on stable (yay?)), so this is probably one of these then? https://github.com/rust-lang/rust/issues?q=is%3Aissue+is%3Aopen+snapshot_vec.rs+

[langston-barrett]

@rustbot label +S-bug-has-mcve -A-incr-comp -WG-incr-comp

[Alexendoo]

Duplicate of #95134