ICE: Failed to normalize Alias(Opaque, AliasTy .. #140303
Description
auto-reduced (treereduce-rust):
//@compile-flags: -Zvalidate-mir use std::future::Future; async fn create_task() -> impl Sized { bind(documentation) } async fn documentation() { !; } fn bind<F>(_filter: F) -> impl Sized where F: FilterBase, { || -> <F as FilterBase>::Assoc { panic!() } } trait FilterBase { type Assoc; } impl<F, R> FilterBase for F where F: Fn() -> R, R: Future, R: Send, { } original:
// Regression test for #135668 //@ edition: 2021 use std::future::Future; pub async fn foo() { let _ = create_task().await; } async fn create_task() -> impl Sized { bind(documentation) } async fn documentation() { compile_error!("bonjour"); //~^ ERROR bonjour } fn bind<F>(_filter: F) -> impl Sized where F: FilterBase, { || -> <F as FilterBase>::Assoc { panic!() } } trait FilterBase { type Assoc; } impl<F, R> FilterBase for F where F: Fn() -> R, // Removing the below line makes it correctly error on both stable and beta R: Future, // Removing the below line makes it ICE on both stable and beta R: Send, // Removing the above two bounds makes it ICE on stable but correctly error on beta { type Type = (); const CONST: usize = 1; //~ NOTE candidate #2 fn foo(&self) {} //~ NOTE candidate #2 } fn main() {}Version information
rustc 1.88.0-nightly (5c54aa781 2025-04-25) binary: rustc commit-hash: 5c54aa781f97ae95ef01a3120650907b87d385d3 commit-date: 2025-04-25 host: x86_64-unknown-linux-gnu release: 1.88.0-nightly LLVM version: 20.1.2 Possibly related line of code:
rust/compiler/rustc_middle/src/ty/normalize_erasing_regions.rs
Lines 165 to 177 in 5c54aa7
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zvalidate-mir
Program output
error[E0670]: `async fn` is not permitted in Rust 2015 --> /tmp/icemaker_global_tempdir.Fy7kUrdY3L11/rustc_testrunner_tmpdir_reporting.oROTq4nV8k6c/mvce.rs:8:1 | 8 | async fn create_task() -> impl Sized { | ^^^^^ to use `async fn`, switch to Rust 2018 or later | = help: pass `--edition 2024` to `rustc` = note: for more on editions, read https://doc.rust-lang.org/edition-guide error[E0670]: `async fn` is not permitted in Rust 2015 --> /tmp/icemaker_global_tempdir.Fy7kUrdY3L11/rustc_testrunner_tmpdir_reporting.oROTq4nV8k6c/mvce.rs:12:1 | 12 | async fn documentation() { | ^^^^^ to use `async fn`, switch to Rust 2018 or later | = help: pass `--edition 2024` to `rustc` = note: for more on editions, read https://doc.rust-lang.org/edition-guide error: expected expression, found `;` --> /tmp/icemaker_global_tempdir.Fy7kUrdY3L11/rustc_testrunner_tmpdir_reporting.oROTq4nV8k6c/mvce.rs:13:6 | 13 | !; | ^ expected expression error[E0601]: `main` function not found in crate `mvce` --> /tmp/icemaker_global_tempdir.Fy7kUrdY3L11/rustc_testrunner_tmpdir_reporting.oROTq4nV8k6c/mvce.rs:40:2 | 40 | } | ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.Fy7kUrdY3L11/rustc_testrunner_tmpdir_reporting.oROTq4nV8k6c/mvce.rs` error[E0046]: not all trait items implemented, missing: `Assoc` --> /tmp/icemaker_global_tempdir.Fy7kUrdY3L11/rustc_testrunner_tmpdir_reporting.oROTq4nV8k6c/mvce.rs:28:1 | 25 | type Assoc; | ---------- `Assoc` from trait ... 28 | / impl<F, R> FilterBase for F 29 | | where 30 | | F: Fn() -> R, ... | 34 | | R: Send, | |____________^ missing `Assoc` in implementation error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13: Failed to normalize Alias(Opaque, AliasTy { args: [FnDef(DefId(0:8 ~ mvce[1e52]::documentation), [])], def_id: DefId(0:13 ~ mvce[1e52]::bind::{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: 0x7d390ed01a93 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h5e5ed7e3dba37109 1: 0x7d390f405ac7 - core::fmt::write::h9eb703e77e802118 2: 0x7d39107f2951 - std::io::Write::write_fmt::h86cc522f97972765 3: 0x7d390ed018f2 - std::sys::backtrace::BacktraceLock::print::h6a10f5f1a1008df7 4: 0x7d390ed0526a - std::panicking::default_hook::{{closure}}::hc9375e73d24b3054 5: 0x7d390ed04def - std::panicking::default_hook::hf26154a2d0532fd5 6: 0x7d390dd75893 - std[ec78c589ec7e8aee]::panicking::update_hook::<alloc[64039d61152c796e]::boxed::Box<rustc_driver_impl[ebb0c86317587fd1]::install_ice_hook::{closure#1}>>::{closure#0} 7: 0x7d390ed05ae3 - std::panicking::rust_panic_with_hook::h9fb4aeb43df093ef 8: 0x7d390ddb1271 - std[ec78c589ec7e8aee]::panicking::begin_panic::<rustc_errors[737037f1c0007803]::ExplicitBug>::{closure#0} 9: 0x7d390dda52a6 - std[ec78c589ec7e8aee]::sys::backtrace::__rust_end_short_backtrace::<std[ec78c589ec7e8aee]::panicking::begin_panic<rustc_errors[737037f1c0007803]::ExplicitBug>::{closure#0}, !> 10: 0x7d390dda5137 - std[ec78c589ec7e8aee]::panicking::begin_panic::<rustc_errors[737037f1c0007803]::ExplicitBug> 11: 0x7d390ddbb641 - <rustc_errors[737037f1c0007803]::diagnostic::BugAbort as rustc_errors[737037f1c0007803]::diagnostic::EmissionGuarantee>::emit_producing_guarantee 12: 0x7d390e4045ea - rustc_middle[e11bc8960ffe44ac]::util::bug::opt_span_bug_fmt::<rustc_span[10bfa2f3d1cd0e94]::span_encoding::Span>::{closure#0} 13: 0x7d390e3df60a - rustc_middle[e11bc8960ffe44ac]::ty::context::tls::with_opt::<rustc_middle[e11bc8960ffe44ac]::util::bug::opt_span_bug_fmt<rustc_span[10bfa2f3d1cd0e94]::span_encoding::Span>::{closure#0}, !>::{closure#0} 14: 0x7d390e3df47b - rustc_middle[e11bc8960ffe44ac]::ty::context::tls::with_context_opt::<rustc_middle[e11bc8960ffe44ac]::ty::context::tls::with_opt<rustc_middle[e11bc8960ffe44ac]::util::bug::opt_span_bug_fmt<rustc_span[10bfa2f3d1cd0e94]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !> 15: 0x7d390b68dda0 - rustc_middle[e11bc8960ffe44ac]::util::bug::bug_fmt 16: 0x7d390fd99084 - <rustc_middle[e11bc8960ffe44ac]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_type_ir[e02aabdd9006fd47]::fold::TypeFolder<rustc_middle[e11bc8960ffe44ac]::ty::context::TyCtxt>>::fold_ty 17: 0x7d39106f3fb5 - rustc_mir_transform[8d2ddc6cd67b9b7]::validate::validate_types 18: 0x7d39104fe241 - <rustc_mir_transform[8d2ddc6cd67b9b7]::validate::Validator as rustc_mir_transform[8d2ddc6cd67b9b7]::pass_manager::MirPass>::run_pass 19: 0x7d390d5bbb85 - rustc_mir_transform[8d2ddc6cd67b9b7]::pass_manager::validate_body 20: 0x7d390f40d1cd - rustc_mir_transform[8d2ddc6cd67b9b7]::run_analysis_to_runtime_passes 21: 0x7d390f96f9e5 - rustc_mir_transform[8d2ddc6cd67b9b7]::mir_drops_elaborated_and_const_checked 22: 0x7d390f96f399 - rustc_query_impl[54ec0e3327109f1d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[54ec0e3327109f1d]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e11bc8960ffe44ac]::query::erase::Erased<[u8; 8usize]>> 23: 0x7d390f7622ac - rustc_query_system[1188370fe5183a9d]::query::plumbing::try_execute_query::<rustc_query_impl[54ec0e3327109f1d]::DynamicConfig<rustc_data_structures[d8d4b55b44c07e9d]::vec_cache::VecCache<rustc_span[10bfa2f3d1cd0e94]::def_id::LocalDefId, rustc_middle[e11bc8960ffe44ac]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[1188370fe5183a9d]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[54ec0e3327109f1d]::plumbing::QueryCtxt, false> 24: 0x7d390f761b8f - rustc_query_impl[54ec0e3327109f1d]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace 25: 0x7d390fe40e18 - rustc_interface[394fb8669b43967f]::passes::run_required_analyses 26: 0x7d39102d1a9e - rustc_interface[394fb8669b43967f]::passes::analysis 27: 0x7d39102d1a6d - rustc_query_impl[54ec0e3327109f1d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[54ec0e3327109f1d]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e11bc8960ffe44ac]::query::erase::Erased<[u8; 0usize]>> 28: 0x7d39102d753d - rustc_query_system[1188370fe5183a9d]::query::plumbing::try_execute_query::<rustc_query_impl[54ec0e3327109f1d]::DynamicConfig<rustc_query_system[1188370fe5183a9d]::query::caches::SingleCache<rustc_middle[e11bc8960ffe44ac]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[54ec0e3327109f1d]::plumbing::QueryCtxt, false> 29: 0x7d39102d7238 - rustc_query_impl[54ec0e3327109f1d]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 30: 0x7d3910651e80 - rustc_interface[394fb8669b43967f]::passes::create_and_enter_global_ctxt::<core[db792b049954ae76]::option::Option<rustc_interface[394fb8669b43967f]::queries::Linker>, rustc_driver_impl[ebb0c86317587fd1]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0} 31: 0x7d39104e9084 - rustc_interface[394fb8669b43967f]::interface::run_compiler::<(), rustc_driver_impl[ebb0c86317587fd1]::run_compiler::{closure#0}>::{closure#1} 32: 0x7d39104a3234 - std[ec78c589ec7e8aee]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[394fb8669b43967f]::util::run_in_thread_with_globals<rustc_interface[394fb8669b43967f]::util::run_in_thread_pool_with_globals<rustc_interface[394fb8669b43967f]::interface::run_compiler<(), rustc_driver_impl[ebb0c86317587fd1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> 33: 0x7d39104a3674 - <<std[ec78c589ec7e8aee]::thread::Builder>::spawn_unchecked_<rustc_interface[394fb8669b43967f]::util::run_in_thread_with_globals<rustc_interface[394fb8669b43967f]::util::run_in_thread_pool_with_globals<rustc_interface[394fb8669b43967f]::interface::run_compiler<(), rustc_driver_impl[ebb0c86317587fd1]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[db792b049954ae76]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 34: 0x7d39104a4a6b - std::sys::pal::unix::thread::Thread::new::thread_start::hd4f8a3dac6df8331 35: 0x7d390a2a370a - <unknown> 36: 0x7d390a327aac - <unknown> 37: 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 1.88.0-nightly (5c54aa781 2025-04-25) running on x86_64-unknown-linux-gnu note: compiler flags: -Z validate-mir -Z dump-mir-dir=dir query stack during panic: #0 [mir_drops_elaborated_and_const_checked] elaborating drops for `create_task::{closure#0}` #1 [analysis] running analysis passes on this crate end of query stack error: aborting due to 6 previous errors Some errors have detailed explanations: E0046, E0601, E0670. For more information about an error, try `rustc --explain E0046`.