rust-lang / rust-lang/rust

ICE: Async Gen Closures

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A-edition-2024 C-bug F-gen_blocks I-edition-triaged I-ICE requires-nightly S-bug-has-test T-compiler
Dominant language
Rust
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Description

Code
#![feature(gen_blocks)]

fn main() {
    let _ = async gen || {};
}
Meta

rustc --version --verbose:

rustc 1.80.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 1.80.0-dev
LLVM version: 18.1.4
Bisects To

#120361

Backtrace 

thread 'rustc' panicked at compiler/rustc_ast_lowering/src/expr.rs:1070:9:
assertion `left matches right` failed: only async closures are supported currently
  left: AsyncGen { span: test.rs:9:13: 9:22 (#0), closure_id: NodeId(15), return_impl_trait_id: NodeId(16) }
 right: CoroutineKind::Async { .. }
stack backtrace:
   0:     0x7faa82543216 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hc2ad577dc1b6821e
   1:     0x7faa825cad4b - core::fmt::write::h9e0aa8528f9e7a96
   2:     0x7faa82553b59 - std::io::Write::write_fmt::hfccb98e06608571a
   3:     0x7faa8254304f - std::sys_common::backtrace::print::h9fd646b9fcaac333
   4:     0x7faa8255c359 - std::panicking::default_hook::{{closure}}::h8196424f119ab9a6
   5:     0x7faa8255c117 - std::panicking::default_hook::he75f39a8bfa68d05
   6:     0x7faa830ebfd9 - <alloc[e6bc8ffa843b0e0b]::boxed::Box<rustc_driver_impl[9c855668c28d8d3b]::install_ice_hook::{closure#0}> as core[8f9a0d34630653c0]::ops::function::Fn<(&dyn for<'a, 'b> core[8f9a0d34630653c0]::ops::function::Fn<(&'a core[8f9a0d34630653c0]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[8f9a0d34630653c0]::marker::Send + core[8f9a0d34630653c0]::marker::Sync, &core[8f9a0d34630653c0]::panic::panic_info::PanicInfo)>>::call
   7:     0x7faa8255c82e - std::panicking::rust_panic_with_hook::h06f1513f2c335868
   8:     0x7faa8256a12e - std::panicking::begin_panic_handler::{{closure}}::hba3fa956fa651055
   9:     0x7faa8256a059 - std::sys_common::backtrace::__rust_end_short_backtrace::hc48b82a32c1361ed
  10:     0x7faa8255c429 - rust_begin_unwind
  11:     0x7faa825321b3 - core::panicking::panic_fmt::h89562522261c833a
  12:     0x7faa8253264f - core::panicking::assert_failed_inner::hf40a98fb5f423830
  13:     0x7faa82eb9d8c - core[8f9a0d34630653c0]::panicking::assert_matches_failed::<rustc_ast[4316ec2cf1b6d1f2]::ast::CoroutineKind>
  14:     0x7faa84083102 - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_expr_coroutine_closure
  15:     0x7faa8407f4fa - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_expr_mut::{closure#0}
  16:     0x7faa8407c576 - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_stmts
  17:     0x7faa8407c27b - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_block
  18:     0x7faa8408c8e6 - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_block_expr_opt
  19:     0x7faa8405758f - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_fn_body::<<rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_fn_body_block::{closure#0}>
  20:     0x7faa8408ca2b - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_maybe_coroutine_body
  21:     0x7faa84058ed0 - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::with_new_scopes::<rustc_hir[e90a0ed907b6549a]::hir::ItemKind, <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_item_kind::{closure#1}>
  22:     0x7faa84089b6f - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::lower_item
  23:     0x7faa8406c733 - <rustc_ast_lowering[5c0c0671e07de916]::LoweringContext>::with_hir_id_owner::<<rustc_ast_lowering[5c0c0671e07de916]::item::ItemLowerer>::with_lctx<<rustc_ast_lowering[5c0c0671e07de916]::item::ItemLowerer>::lower_item::{closure#0}>::{closure#0}>
  24:     0x7faa840b8684 - <rustc_ast_lowering[5c0c0671e07de916]::item::ItemLowerer>::with_lctx::<<rustc_ast_lowering[5c0c0671e07de916]::item::ItemLowerer>::lower_item::{closure#0}>
  25:     0x7faa840bb9bf - <rustc_ast_lowering[5c0c0671e07de916]::item::ItemLowerer>::lower_node
  26:     0x7faa840920f9 - rustc_ast_lowering[5c0c0671e07de916]::lower_to_hir
  27:     0x7faa84891f46 - rustc_query_impl[efd99a9a4001822]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[efd99a9a4001822]::query_impl::hir_crate::dynamic_query::{closure#2}::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>
  28:     0x7faa846367e9 - <rustc_query_impl[efd99a9a4001822]::query_impl::hir_crate::dynamic_query::{closure#2} as core[8f9a0d34630653c0]::ops::function::FnOnce<(rustc_middle[925c171ccec961ea]::ty::context::TyCtxt, ())>>::call_once
  29:     0x7faa84564fa7 - <std[afc5627afab9b6c]::thread::local::LocalKey<core[8f9a0d34630653c0]::cell::Cell<*const ()>>>::with::<rustc_middle[925c171ccec961ea]::ty::context::tls::enter_context<rustc_query_system[b6250073b875db0f]::query::plumbing::execute_job_non_incr<rustc_query_impl[efd99a9a4001822]::DynamicConfig<rustc_query_system[b6250073b875db0f]::query::caches::SingleCache<rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[efd99a9a4001822]::plumbing::QueryCtxt>::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>
  30:     0x7faa84795daa - rustc_query_system[b6250073b875db0f]::query::plumbing::try_execute_query::<rustc_query_impl[efd99a9a4001822]::DynamicConfig<rustc_query_system[b6250073b875db0f]::query::caches::SingleCache<rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[efd99a9a4001822]::plumbing::QueryCtxt, false>
  31:     0x7faa8489408b - rustc_query_impl[efd99a9a4001822]::query_impl::hir_crate::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7faa857dd408 - <rustc_middle[925c171ccec961ea]::hir::provide::{closure#3} as core[8f9a0d34630653c0]::ops::function::FnOnce<(rustc_middle[925c171ccec961ea]::ty::context::TyCtxt, rustc_hir[e90a0ed907b6549a]::hir_id::OwnerId)>>::call_once
  33:     0x7faa84891dc9 - rustc_query_impl[efd99a9a4001822]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[efd99a9a4001822]::query_impl::hir_attrs::dynamic_query::{closure#2}::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>
  34:     0x7faa84804e8c - <rustc_query_impl[efd99a9a4001822]::query_impl::hir_attrs::dynamic_query::{closure#2} as core[8f9a0d34630653c0]::ops::function::FnOnce<(rustc_middle[925c171ccec961ea]::ty::context::TyCtxt, rustc_hir[e90a0ed907b6549a]::hir_id::OwnerId)>>::call_once
  35:     0x7faa845682ce - <std[afc5627afab9b6c]::thread::local::LocalKey<core[8f9a0d34630653c0]::cell::Cell<*const ()>>>::with::<rustc_middle[925c171ccec961ea]::ty::context::tls::enter_context<rustc_query_system[b6250073b875db0f]::query::plumbing::execute_job_non_incr<rustc_query_impl[efd99a9a4001822]::DynamicConfig<rustc_query_system[b6250073b875db0f]::query::caches::VecCache<rustc_hir[e90a0ed907b6549a]::hir_id::OwnerId, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[efd99a9a4001822]::plumbing::QueryCtxt>::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>
  36:     0x7faa847ffa8c - rustc_query_system[b6250073b875db0f]::query::plumbing::try_execute_query::<rustc_query_impl[efd99a9a4001822]::DynamicConfig<rustc_query_system[b6250073b875db0f]::query::caches::VecCache<rustc_hir[e90a0ed907b6549a]::hir_id::OwnerId, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[efd99a9a4001822]::plumbing::QueryCtxt, false>
  37:     0x7faa84635c76 - rustc_query_impl[efd99a9a4001822]::query_impl::hir_attrs::get_query_non_incr::__rust_end_short_backtrace
  38:     0x7faa858320aa - <rustc_middle[925c171ccec961ea]::hir::map::Map>::attrs
  39:     0x7faa843a52cf - rustc_passes[827c2f259c8e8167]::entry::entry_fn
  40:     0x7faa84891533 - rustc_query_impl[efd99a9a4001822]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[efd99a9a4001822]::query_impl::entry_fn::dynamic_query::{closure#2}::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 12usize]>>
  41:     0x7faa846220fd - <rustc_query_impl[efd99a9a4001822]::query_impl::entry_fn::dynamic_query::{closure#2} as core[8f9a0d34630653c0]::ops::function::FnOnce<(rustc_middle[925c171ccec961ea]::ty::context::TyCtxt, ())>>::call_once
  42:     0x7faa8456503e - <std[afc5627afab9b6c]::thread::local::LocalKey<core[8f9a0d34630653c0]::cell::Cell<*const ()>>>::with::<rustc_middle[925c171ccec961ea]::ty::context::tls::enter_context<rustc_query_system[b6250073b875db0f]::query::plumbing::execute_job_non_incr<rustc_query_impl[efd99a9a4001822]::DynamicConfig<rustc_query_system[b6250073b875db0f]::query::caches::SingleCache<rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 12usize]>>, false, false, false>, rustc_query_impl[efd99a9a4001822]::plumbing::QueryCtxt>::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 12usize]>>::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 12usize]>>
  43:     0x7faa84796f6d - rustc_query_system[b6250073b875db0f]::query::plumbing::try_execute_query::<rustc_query_impl[efd99a9a4001822]::DynamicConfig<rustc_query_system[b6250073b875db0f]::query::caches::SingleCache<rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 12usize]>>, false, false, false>, rustc_query_impl[efd99a9a4001822]::plumbing::QueryCtxt, false>
  44:     0x7faa8462291b - rustc_query_impl[efd99a9a4001822]::query_impl::entry_fn::get_query_non_incr::__rust_end_short_backtrace
  45:     0x7faa8326df41 - <rustc_session[a2499ec62cb1d9b8]::session::Session>::time::<(), rustc_interface[9a3e0f1c28247fb]::passes::run_required_analyses::{closure#0}::{closure#0}::{closure#0}::{closure#0}>
  46:     0x7faa8331a605 - std[afc5627afab9b6c]::panicking::try::<(), core[8f9a0d34630653c0]::panic::unwind_safe::AssertUnwindSafe<rustc_interface[9a3e0f1c28247fb]::passes::run_required_analyses::{closure#0}::{closure#0}::{closure#0}>>
  47:     0x7faa832f8fec - <rustc_data_structures[5bcea33e1f4ea30c]::sync::parallel::ParallelGuard>::run::<(), rustc_interface[9a3e0f1c28247fb]::passes::run_required_analyses::{closure#0}::{closure#0}::{closure#0}>
  48:     0x7faa8326e632 - <rustc_session[a2499ec62cb1d9b8]::session::Session>::time::<(), rustc_interface[9a3e0f1c28247fb]::passes::run_required_analyses::{closure#0}>
  49:     0x7faa8329dca3 - rustc_interface[9a3e0f1c28247fb]::passes::analysis
  50:     0x7faa84890f47 - rustc_query_impl[efd99a9a4001822]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[efd99a9a4001822]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 1usize]>>
  51:     0x7faa84815dc9 - <rustc_query_impl[efd99a9a4001822]::query_impl::analysis::dynamic_query::{closure#2} as core[8f9a0d34630653c0]::ops::function::FnOnce<(rustc_middle[925c171ccec961ea]::ty::context::TyCtxt, ())>>::call_once
  52:     0x7faa84564e87 - <std[afc5627afab9b6c]::thread::local::LocalKey<core[8f9a0d34630653c0]::cell::Cell<*const ()>>>::with::<rustc_middle[925c171ccec961ea]::ty::context::tls::enter_context<rustc_query_system[b6250073b875db0f]::query::plumbing::execute_job_non_incr<rustc_query_impl[efd99a9a4001822]::DynamicConfig<rustc_query_system[b6250073b875db0f]::query::caches::SingleCache<rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[efd99a9a4001822]::plumbing::QueryCtxt>::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 1usize]>>::{closure#0}, rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 1usize]>>
  53:     0x7faa84793ab1 - rustc_query_system[b6250073b875db0f]::query::plumbing::try_execute_query::<rustc_query_impl[efd99a9a4001822]::DynamicConfig<rustc_query_system[b6250073b875db0f]::query::caches::SingleCache<rustc_middle[925c171ccec961ea]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[efd99a9a4001822]::plumbing::QueryCtxt, false>
  54:     0x7faa84523f62 - rustc_query_impl[efd99a9a4001822]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  55:     0x7faa8307ab90 - <std[afc5627afab9b6c]::thread::local::LocalKey<core[8f9a0d34630653c0]::cell::Cell<*const ()>>>::with::<rustc_middle[925c171ccec961ea]::ty::context::tls::enter_context<<rustc_middle[925c171ccec961ea]::ty::context::GlobalCtxt>::enter<rustc_driver_impl[9c855668c28d8d3b]::run_compiler::{closure#0}::{closure#1}::{closure#3}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#1}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>
  56:     0x7faa830ca746 - <rustc_middle[925c171ccec961ea]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[9c855668c28d8d3b]::run_compiler::{closure#0}::{closure#1}::{closure#3}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>
  57:     0x7faa830607a3 - <rustc_interface[9a3e0f1c28247fb]::interface::Compiler>::enter::<rustc_driver_impl[9c855668c28d8d3b]::run_compiler::{closure#0}::{closure#1}, core[8f9a0d34630653c0]::result::Result<core[8f9a0d34630653c0]::option::Option<rustc_interface[9a3e0f1c28247fb]::queries::Linker>, rustc_span[5de32988c3388e42]::ErrorGuaranteed>>
  58:     0x7faa830fea57 - <scoped_tls[8df7d912cec66977]::ScopedKey<rustc_span[5de32988c3388e42]::SessionGlobals>>::set::<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_with_globals<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_pool_with_globals<rustc_interface[9a3e0f1c28247fb]::interface::run_compiler<core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>, rustc_driver_impl[9c855668c28d8d3b]::run_compiler::{closure#0}>::{closure#1}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>
  59:     0x7faa83070bb5 - rustc_span[5de32988c3388e42]::create_session_globals_then::<core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>, rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_with_globals<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_pool_with_globals<rustc_interface[9a3e0f1c28247fb]::interface::run_compiler<core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>, rustc_driver_impl[9c855668c28d8d3b]::run_compiler::{closure#0}>::{closure#1}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}>
  60:     0x7faa830e5f26 - std[afc5627afab9b6c]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_with_globals<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_pool_with_globals<rustc_interface[9a3e0f1c28247fb]::interface::run_compiler<core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>, rustc_driver_impl[9c855668c28d8d3b]::run_compiler::{closure#0}>::{closure#1}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>
  61:     0x7faa830c5cc1 - std[afc5627afab9b6c]::panicking::try::<core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>, core[8f9a0d34630653c0]::panic::unwind_safe::AssertUnwindSafe<<std[afc5627afab9b6c]::thread::Builder>::spawn_unchecked_<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_with_globals<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_pool_with_globals<rustc_interface[9a3e0f1c28247fb]::interface::run_compiler<core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>, rustc_driver_impl[9c855668c28d8d3b]::run_compiler::{closure#0}>::{closure#1}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#2}::{closure#0}>>
  62:     0x7faa83109785 - <<std[afc5627afab9b6c]::thread::Builder>::spawn_unchecked_<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_with_globals<rustc_interface[9a3e0f1c28247fb]::util::run_in_thread_pool_with_globals<rustc_interface[9a3e0f1c28247fb]::interface::run_compiler<core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>, rustc_driver_impl[9c855668c28d8d3b]::run_compiler::{closure#0}>::{closure#1}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8f9a0d34630653c0]::result::Result<(), rustc_span[5de32988c3388e42]::ErrorGuaranteed>>::{closure#2} as core[8f9a0d34630653c0]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  63:     0x7faa8253672d - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7a7a3823a5cfefcd
  64:     0x7faa825798da - std::sys::pal::unix::thread::Thread::new::thread_start::h4edf7802148ea1bf
  65:     0x7faa8232eac3 - start_thread
                               at ./nptl/pthread_create.c:442:8
  66:     0x7faa823c0850 - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  67:                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: please make sure that you have updated to the latest nightly

note: please attach the file at `/home/veera/projects/rust/rustc-ice-2024-05-05T14_03_30-983035.txt` to your bug report

note: compiler flags: -Z unstable-options -Z track-diagnostics

query stack during panic:
#0 [hir_crate] getting the crate HIR
#1 [hir_attrs] getting HIR owner attributes in ``
#2 [entry_fn] looking up the entry function of a crate
#3 [analysis] running analysis passes on this crate
end of query stack

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with compiler/rustc_ast_lowering/src/expr.rs at line 1070 and the lower_expr_coroutine_closure entry point named in the backtrace. Run the provided async gen closure reproducer with the affected compiler, then compare behavior around the bisect target #120361. Done means the example no longer triggers an internal compiler assertion.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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