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matthiaskrgr opened this issue Jun 1, 2025 · 1 comment
Open

ICE: Failed to normalize &'{erased} mut Alias(Opaque #141850

matthiaskrgr opened this issue Jun 1, 2025 · 1 comment
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C-bug Category: This is a bug. F-pin_ergonomics `#![feature(pin_ergonomics)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@matthiaskrgr
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auto-reduced (treereduce-rust):

//@compile-flags: --edition=2024
#![feature(pin_ergonomics)]
async fn a() {
    wrapper_call(handler, ()).await;
}
async fn wrapper_call<F, Args>(handler: F, args: Args) -> F::Output
where
    F: Handler<Args>,
{
    handler.call(args).await
}
async fn handler();
trait Handler<Args>: 'static {
    type Output;
    type Future: Future<Output = Self::Output>;
    fn call(&self, args: Args) -> Self::Future;
}
impl<Func, Fut> Handler() for Func
where
    Func: Fn() -> Fut + Clone + 'static,
    Fut: Future,
{
    type Output = Fut;
}

original:

#![feature(pin_ergonomics)]
async fn a() {
    wrapper_call(handler, ()).await;
}
async fn wrapper_call<F, Args>(handler: F, args: Args) -> F::Output
where
    F: Handler<Args>,
{
    handler.call(args).await
}
async fn handler();
trait Handler<Args>: 'static {
    type Output;
    type Future: Future<Output = Self::Output>;
    fn call(&self, args: Args) -> Self::Future;
}
impl<Func, Fut> Handler() for Func
where
    Func: Fn() -> Fut + Clone + 'static,
    Fut: Future,
{
    type Output = Fut;
}

Version information

rustc 1.89.0-nightly (13a454090 2025-06-01)
binary: rustc
commit-hash: 13a4540908d25642c0fa0ab726095cf57bbe6824
commit-date: 2025-06-01
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.5

Possibly related line of code:

rust/compiler/rustc_middle/src/ty/normalize_erasing_regions.rs

Lines 165 to 177 in 13a4540

fn normalize_generic_arg_after_erasing_regions(
&self,
arg: ty::GenericArg<'tcx>,
) -> ty::GenericArg<'tcx> {
let arg = self.typing_env.as_query_input(arg);
self.tcx.try_normalize_generic_arg_after_erasing_regions(arg).unwrap_or_else(|_| {
bug!(
"Failed to normalize {:?} in typing_env={:?}, \
maybe try to call `try_normalize_erasing_regions` instead",
arg.value,
self.typing_env,
)
})

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2024

Program output 

error: free function without a body
  --> /tmp/icemaker_global_tempdir.RuqRgdhmMFsu/rustc_testrunner_tmpdir_reporting.kFTDMkrcqGyG/mvce.rs:11:1
   |
11 | async fn handler();
   | ^^^^^^^^^^^^^^^^^^-
   |                   |
   |                   help: provide a definition for the function: `{ <body> }`

warning: the feature `pin_ergonomics` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /tmp/icemaker_global_tempdir.RuqRgdhmMFsu/rustc_testrunner_tmpdir_reporting.kFTDMkrcqGyG/mvce.rs:1:12
  |
1 | #![feature(pin_ergonomics)]
  |            ^^^^^^^^^^^^^^
  |
  = note: see issue #130494 <https://github.com/rust-lang/rust/issues/130494> for more information
  = note: `#[warn(incomplete_features)]` on by default

error[E0601]: `main` function not found in crate `mvce`
  --> /tmp/icemaker_global_tempdir.RuqRgdhmMFsu/rustc_testrunner_tmpdir_reporting.kFTDMkrcqGyG/mvce.rs:23:2
   |
23 | }
   |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.RuqRgdhmMFsu/rustc_testrunner_tmpdir_reporting.kFTDMkrcqGyG/mvce.rs`

error[E0658]: parenthetical notation is only stable when used with `Fn`-family traits
  --> /tmp/icemaker_global_tempdir.RuqRgdhmMFsu/rustc_testrunner_tmpdir_reporting.kFTDMkrcqGyG/mvce.rs:17:17
   |
17 | impl<Func, Fut> Handler() for Func
   |                 ^^^^^^^^^
   |
   = note: see issue #29625 <https://github.com/rust-lang/rust/issues/29625> for more information
   = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable
   = note: this compiler was built on 2025-06-01; consider upgrading it if it is out of date

error[E0229]: associated item constraints are not allowed here
  --> /tmp/icemaker_global_tempdir.RuqRgdhmMFsu/rustc_testrunner_tmpdir_reporting.kFTDMkrcqGyG/mvce.rs:17:17
   |
17 | impl<Func, Fut> Handler() for Func
   |                 ^^^^^^^^^ associated item constraint not allowed here
   |
help: parenthesized trait syntax expands to `Handler<(), Output=()>`
  --> /tmp/icemaker_global_tempdir.RuqRgdhmMFsu/rustc_testrunner_tmpdir_reporting.kFTDMkrcqGyG/mvce.rs:17:17
   |
17 | impl<Func, Fut> Handler() for Func
   |                 ^^^^^^^^^

error[E0046]: not all trait items implemented, missing: `Future`, `call`
  --> /tmp/icemaker_global_tempdir.RuqRgdhmMFsu/rustc_testrunner_tmpdir_reporting.kFTDMkrcqGyG/mvce.rs:17:1
   |
14 |       type Future: Future<Output = Self::Output>;
   |       ------------------------------------------ `Future` from trait
15 |       fn call(&self, args: Args) -> Self::Future;
   |       ------------------------------------------- `call` from trait
16 |   }
17 | / impl<Func, Fut> Handler() for Func
18 | | where
19 | |     Func: Fn() -> Fut + Clone + 'static,
20 | |     Fut: Future,
   | |________________^ missing `Future`, `call` in implementation

error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13: Failed to normalize &'{erased} mut Alias(Opaque, AliasTy { args: [FnDef(DefId(0:11 ~ mvce[0140]::handler), []), ()], def_id: DefId(0:9 ~ mvce[0140]::wrapper_call::{opaque#0}), .. }) in typing_env=TypingEnv { typing_mode: PostAnalysis, param_env: ParamEnv { caller_bounds: [] } }, maybe try to call `try_normalize_erasing_regions` instead


thread 'rustc' panicked at compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13:
Box<dyn Any>
stack backtrace:
   0:     0x7991cc6de703 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h1750895f43e843d4
   1:     0x7991cce03237 - core::fmt::write::h6b549521393450c4
   2:     0x7991cc6d4383 - std::io::Write::write_fmt::h56b183ab660d16eb
   3:     0x7991cc6de562 - std::sys::backtrace::BacktraceLock::print::h96fec1ee4eaf5d52
   4:     0x7991cc6e215a - std::panicking::default_hook::{{closure}}::h0272a1832c315d01
   5:     0x7991cc6e1cdf - std::panicking::default_hook::hbb92434c436b38d4
   6:     0x7991cb7fa5b3 - std[d5a5e8436f7bb80d]::panicking::update_hook::<alloc[84a9b4db4b1fd3b6]::boxed::Box<rustc_driver_impl[12f4e41c2796a3e6]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7991cc6e29d3 - std::panicking::rust_panic_with_hook::hdd99d03934c0d55d
   8:     0x7991cb8372d1 - std[d5a5e8436f7bb80d]::panicking::begin_panic::<rustc_errors[78ce2d78f255827f]::ExplicitBug>::{closure#0}
   9:     0x7991cb82bbc6 - std[d5a5e8436f7bb80d]::sys::backtrace::__rust_end_short_backtrace::<std[d5a5e8436f7bb80d]::panicking::begin_panic<rustc_errors[78ce2d78f255827f]::ExplicitBug>::{closure#0}, !>
  10:     0x7991cb82baab - std[d5a5e8436f7bb80d]::panicking::begin_panic::<rustc_errors[78ce2d78f255827f]::ExplicitBug>
  11:     0x7991cb840dc1 - <rustc_errors[78ce2d78f255827f]::diagnostic::BugAbort as rustc_errors[78ce2d78f255827f]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7991cbde238a - rustc_middle[c87150728fec5a49]::util::bug::opt_span_bug_fmt::<rustc_span[1b2e5f36c4767dc6]::span_encoding::Span>::{closure#0}
  13:     0x7991cbdc1dca - rustc_middle[c87150728fec5a49]::ty::context::tls::with_opt::<rustc_middle[c87150728fec5a49]::util::bug::opt_span_bug_fmt<rustc_span[1b2e5f36c4767dc6]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7991cbdc1c3b - rustc_middle[c87150728fec5a49]::ty::context::tls::with_context_opt::<rustc_middle[c87150728fec5a49]::ty::context::tls::with_opt<rustc_middle[c87150728fec5a49]::util::bug::opt_span_bug_fmt<rustc_span[1b2e5f36c4767dc6]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7991c8eaa280 - rustc_middle[c87150728fec5a49]::util::bug::bug_fmt
  16:     0x7991cd8b40ff - <rustc_middle[c87150728fec5a49]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_type_ir[c774dfba22605253]::fold::TypeFolder<rustc_middle[c87150728fec5a49]::ty::context::TyCtxt>>::fold_ty
  17:     0x7991ce422973 - rustc_mir_transform[8ab4230bc871fcc6]::validate::validate_types
  18:     0x7991cdccf4ac - <rustc_mir_transform[8ab4230bc871fcc6]::validate::Validator as rustc_mir_transform[8ab4230bc871fcc6]::pass_manager::MirPass>::run_pass
  19:     0x7991cce109eb - rustc_mir_transform[8ab4230bc871fcc6]::run_optimization_passes
  20:     0x7991cdb3b9dc - rustc_mir_transform[8ab4230bc871fcc6]::optimized_mir
  21:     0x7991cdb3b19d - rustc_query_impl[22a781136fdb8532]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[22a781136fdb8532]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c87150728fec5a49]::query::erase::Erased<[u8; 8usize]>>
  22:     0x7991cce25ae5 - rustc_query_system[58eb503a7502457a]::query::plumbing::try_execute_query::<rustc_query_impl[22a781136fdb8532]::DynamicConfig<rustc_query_system[58eb503a7502457a]::query::caches::DefIdCache<rustc_middle[c87150728fec5a49]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[22a781136fdb8532]::plumbing::QueryCtxt, false>
  23:     0x7991cce24f1b - rustc_query_impl[22a781136fdb8532]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  24:     0x7991ce21e068 - <rustc_middle[c87150728fec5a49]::ty::context::TyCtxt>::coroutine_layout
  25:     0x7991cd51b5ba - rustc_ty_utils[4b7a7000bd020946]::layout::layout_of_uncached
  26:     0x7991cd50b689 - rustc_ty_utils[4b7a7000bd020946]::layout::layout_of
  27:     0x7991cd50b5ea - rustc_query_impl[22a781136fdb8532]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[22a781136fdb8532]::query_impl::layout_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c87150728fec5a49]::query::erase::Erased<[u8; 16usize]>>
  28:     0x7991cd50a50f - rustc_query_system[58eb503a7502457a]::query::plumbing::try_execute_query::<rustc_query_impl[22a781136fdb8532]::DynamicConfig<rustc_query_system[58eb503a7502457a]::query::caches::DefaultCache<rustc_middle[c87150728fec5a49]::ty::PseudoCanonicalInput<rustc_middle[c87150728fec5a49]::ty::Ty>, rustc_middle[c87150728fec5a49]::query::erase::Erased<[u8; 16usize]>>, false, true, false>, rustc_query_impl[22a781136fdb8532]::plumbing::QueryCtxt, false>
  29:     0x7991cd50a164 - rustc_query_impl[22a781136fdb8532]::query_impl::layout_of::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7991cddd7cf6 - <rustc_mir_transform[8ab4230bc871fcc6]::known_panics_lint::KnownPanicsLint as rustc_mir_transform[8ab4230bc871fcc6]::pass_manager::MirLint>::run_lint
  31:     0x7991cce0b09c - rustc_mir_transform[8ab4230bc871fcc6]::run_analysis_to_runtime_passes
  32:     0x7991cd36f327 - rustc_mir_transform[8ab4230bc871fcc6]::mir_drops_elaborated_and_const_checked
  33:     0x7991cd36ece3 - rustc_query_impl[22a781136fdb8532]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[22a781136fdb8532]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c87150728fec5a49]::query::erase::Erased<[u8; 8usize]>>
  34:     0x7991ccfccd66 - rustc_query_system[58eb503a7502457a]::query::plumbing::try_execute_query::<rustc_query_impl[22a781136fdb8532]::DynamicConfig<rustc_data_structures[cdeb167cf83dddb5]::vec_cache::VecCache<rustc_span[1b2e5f36c4767dc6]::def_id::LocalDefId, rustc_middle[c87150728fec5a49]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[58eb503a7502457a]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[22a781136fdb8532]::plumbing::QueryCtxt, false>
  35:     0x7991ccfcc589 - rustc_query_impl[22a781136fdb8532]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7991ccfc74dc - rustc_interface[2437496f2585cb44]::passes::run_required_analyses
  37:     0x7991cdb4f81e - rustc_interface[2437496f2585cb44]::passes::analysis
  38:     0x7991cdb4f7f3 - rustc_query_impl[22a781136fdb8532]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[22a781136fdb8532]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c87150728fec5a49]::query::erase::Erased<[u8; 0usize]>>
  39:     0x7991cdb526ce - rustc_query_system[58eb503a7502457a]::query::plumbing::try_execute_query::<rustc_query_impl[22a781136fdb8532]::DynamicConfig<rustc_query_system[58eb503a7502457a]::query::caches::SingleCache<rustc_middle[c87150728fec5a49]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[22a781136fdb8532]::plumbing::QueryCtxt, false>
  40:     0x7991cdb522b6 - rustc_query_impl[22a781136fdb8532]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7991ce08edff - rustc_interface[2437496f2585cb44]::passes::create_and_enter_global_ctxt::<core[8a55f9a5e0f462be]::option::Option<rustc_interface[2437496f2585cb44]::queries::Linker>, rustc_driver_impl[12f4e41c2796a3e6]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  42:     0x7991ce08188c - rustc_interface[2437496f2585cb44]::interface::run_compiler::<(), rustc_driver_impl[12f4e41c2796a3e6]::run_compiler::{closure#0}>::{closure#1}
  43:     0x7991ce031448 - std[d5a5e8436f7bb80d]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[2437496f2585cb44]::util::run_in_thread_with_globals<rustc_interface[2437496f2585cb44]::util::run_in_thread_pool_with_globals<rustc_interface[2437496f2585cb44]::interface::run_compiler<(), rustc_driver_impl[12f4e41c2796a3e6]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  44:     0x7991ce031130 - <<std[d5a5e8436f7bb80d]::thread::Builder>::spawn_unchecked_<rustc_interface[2437496f2585cb44]::util::run_in_thread_with_globals<rustc_interface[2437496f2585cb44]::util::run_in_thread_pool_with_globals<rustc_interface[2437496f2585cb44]::interface::run_compiler<(), rustc_driver_impl[12f4e41c2796a3e6]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[8a55f9a5e0f462be]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:     0x7991ce02f77d - std::sys::pal::unix::thread::Thread::new::thread_start::h7d76966977b816fa
  46:     0x7991c7aa57eb - <unknown>
  47:     0x7991c7b2918c - <unknown>
  48:                0x0 - <unknown>

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: please make sure that you have updated to the latest nightly

note: rustc 1.89.0-nightly (13a454090 2025-06-01) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z dump-mir-dir=dir

query stack during panic:
#0 [optimized_mir] optimizing MIR for `a::{closure#0}`
#1 [layout_of] computing layout of `{async fn body of a()}`
#2 [mir_drops_elaborated_and_const_checked] elaborating drops for `a`
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 6 previous errors; 1 warning emitted

Some errors have detailed explanations: E0046, E0229, E0601, E0658.
For more information about an error, try `rustc --explain E0046`.

@rustbot label +F-pin_ergonomics
@matthiaskrgr matthiaskrgr added I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. labels Jun 1, 2025
@rustbot rustbot added needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. F-pin_ergonomics `#![feature(pin_ergonomics)]` labels Jun 1, 2025
@cyrgani
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cyrgani commented Jun 1, 2025 

//@compile-flags: --edition=2024
#![feature(pin_ergonomics)]
async fn a() {
    wrapper_call(handler).await;
}
async fn wrapper_call<F>(_: F) -> F::Output
where
    F: Handler,
{
    todo!()
}
async fn handler();
trait Handler {
    type Output;
}
impl<Func, Fut> Handler for Func
where
    Func: Fn() -> Fut,
    Fut: Future,
{
    type Output = Fut;
}

@compiler-errors compiler-errors added E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example and removed E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example labels Jun 2, 2025
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