ICE after using const for const generic param

[ericlagergren]

Code

The ICE occurred after I used DEFAULT_CHUNK_SIZE as the generic const parameter for Reader and Writer instead of using a literal.

Here is the exact code: ericlagergren/stream-rs@4608177

I don't have a minimal repro, sorry.

Meta

rustc --version --verbose:

rustc 1.71.0-nightly (b628260df 2023-04-22)
binary: rustc
commit-hash: b628260df0587ae559253d8640ecb8738d3de613
commit-date: 2023-04-22
host: aarch64-apple-darwin
release: 1.71.0-nightly
LLVM version: 16.0.2

Error output

$ cargo test --features std -- --nocapture
   Compiling stream v0.1.0 (/Users/eric/git/stream-rs)
error: internal compiler error: compiler/rustc_middle/src/ty/subst.rs:915:9: const parameter `C/#3` (Const { ty: usize, kind: Param(C/#3) }/3) out of range when substituting substs=['_#38r, _, chacha20poly1305::ChaChaPoly1305<aes::cipher::StreamCipherCoreWrapper<chacha20::xchacha::XChaChaCore<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UTerm, aead::consts::B1>, aead::consts::B0>, aead::consts::B1>, aead::consts::B0>>>, aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UTerm, aead::consts::B1>, aead::consts::B1>, aead::consts::B0>, aead::consts::B0>, aead::consts::B0>>]

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/b628260df0587ae559253d8640ecb8738d3de613/compiler/rustc_errors/src/lib.rs:1643:9
stack backtrace:
   0:        0x10313c78c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h378faa8cd2682042
   1:        0x10318c7cc - core::fmt::write::h45332108b05b8919
   2:        0x1031326ac - std::io::Write::write_fmt::hde34ad6d308b1301
   3:        0x10313c5ec - std::sys_common::backtrace::print::h55a4c014a10aac9b
   4:        0x10313eecc - std::panicking::default_hook::{{closure}}::h293442e8007a84b1
   5:        0x10313ebc4 - std::panicking::default_hook::hcf46e03ff7863c39
   6:        0x10b678510 - rustc_driver_impl[682bce9d94f8fc57]::DEFAULT_HOOK::{closure#0}::{closure#0}
   7:        0x10313f530 - std::panicking::rust_panic_with_hook::h32c159227be0227d
   8:        0x10f43bd28 - std[11e8f5d0c59412da]::panicking::begin_panic::<rustc_errors[69a9607651256b12]::ExplicitBug>::{closure#0}
   9:        0x10f4397b8 - std[11e8f5d0c59412da]::sys_common::backtrace::__rust_end_short_backtrace::<std[11e8f5d0c59412da]::panicking::begin_panic<rustc_errors[69a9607651256b12]::ExplicitBug>::{closure#0}, !>
  10:        0x10fa745d8 - std[11e8f5d0c59412da]::panicking::begin_panic::<rustc_errors[69a9607651256b12]::ExplicitBug>
  11:        0x10f4fdae4 - <rustc_errors[69a9607651256b12]::HandlerInner>::bug::<&alloc[2d8f6ce60904bd49]::string::String>
  12:        0x10f4fd7a8 - <rustc_errors[69a9607651256b12]::Handler>::bug::<&alloc[2d8f6ce60904bd49]::string::String>
  13:        0x10f4a01c4 - rustc_middle[741ab025093759e2]::util::bug::opt_span_bug_fmt::<rustc_span[6c3f9550a9acf6ff]::span_encoding::Span>::{closure#0}
  14:        0x10f49fbb0 - rustc_middle[741ab025093759e2]::ty::context::tls::with_opt::<rustc_middle[741ab025093759e2]::util::bug::opt_span_bug_fmt<rustc_span[6c3f9550a9acf6ff]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  15:        0x10f49fb7c - rustc_middle[741ab025093759e2]::ty::context::tls::with_context_opt::<rustc_middle[741ab025093759e2]::ty::context::tls::with_opt<rustc_middle[741ab025093759e2]::util::bug::opt_span_bug_fmt<rustc_span[6c3f9550a9acf6ff]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  16:        0x10fa74598 - rustc_middle[741ab025093759e2]::util::bug::bug_fmt
  17:        0x10fa7456c - <rustc_middle[741ab025093759e2]::ty::subst::SubstFolder>::const_param_out_of_range
  18:        0x10f49eb5c - <rustc_middle[741ab025093759e2]::ty::subst::SubstFolder as rustc_type_ir[eba729774b85a827]::fold::TypeFolder<rustc_middle[741ab025093759e2]::ty::context::TyCtxt>>::fold_const
  19:        0x10f4c183c - rustc_middle[741ab025093759e2]::ty::util::fold_list::<rustc_middle[741ab025093759e2]::ty::subst::SubstFolder, rustc_middle[741ab025093759e2]::ty::subst::GenericArg, <&rustc_middle[741ab025093759e2]::ty::list::List<rustc_middle[741ab025093759e2]::ty::subst::GenericArg> as rustc_type_ir[eba729774b85a827]::fold::TypeFoldable<rustc_middle[741ab025093759e2]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[741ab025093759e2]::ty::subst::SubstFolder>::{closure#0}>
  20:        0x10f51437c - <rustc_middle[741ab025093759e2]::ty::consts::kind::ConstKind as rustc_type_ir[eba729774b85a827]::fold::TypeFoldable<rustc_middle[741ab025093759e2]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[741ab025093759e2]::ty::subst::SubstFolder>
  21:        0x10f49ea64 - <rustc_middle[741ab025093759e2]::ty::subst::SubstFolder as rustc_type_ir[eba729774b85a827]::fold::TypeFolder<rustc_middle[741ab025093759e2]::ty::context::TyCtxt>>::fold_const
  22:        0x10f41a814 - <rustc_middle[741ab025093759e2]::ty::Ty as rustc_type_ir[eba729774b85a827]::fold::TypeSuperFoldable<rustc_middle[741ab025093759e2]::ty::context::TyCtxt>>::super_fold_with::<rustc_middle[741ab025093759e2]::ty::subst::SubstFolder>
  23:        0x10f42a37c - <rustc_middle[741ab025093759e2]::ty::PredicateKind as rustc_type_ir[eba729774b85a827]::fold::TypeFoldable<rustc_middle[741ab025093759e2]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[741ab025093759e2]::ty::subst::SubstFolder>
  24:        0x10f497980 - <alloc[2d8f6ce60904bd49]::vec::Vec<rustc_middle[741ab025093759e2]::ty::Predicate> as alloc[2d8f6ce60904bd49]::vec::spec_extend::SpecExtend<rustc_middle[741ab025093759e2]::ty::Predicate, core[48081c40cc16d56a]::iter::adapters::map::Map<core[48081c40cc16d56a]::slice::iter::Iter<(rustc_middle[741ab025093759e2]::ty::Predicate, rustc_span[6c3f9550a9acf6ff]::span_encoding::Span)>, <rustc_middle[741ab025093759e2]::ty::generics::GenericPredicates>::instantiate_into::{closure#0}>>>::spec_extend
  25:        0x10f467a30 - <rustc_middle[741ab025093759e2]::ty::generics::GenericPredicates>::instantiate_into
  26:        0x10f46284c - <rustc_middle[741ab025093759e2]::ty::generics::GenericPredicates>::instantiate
  27:        0x10f293fb0 - <rustc_trait_selection[b36b2923aaa59c51]::traits::wf::WfPredicates>::nominal_obligations_inner
  28:        0x10f293168 - <rustc_trait_selection[b36b2923aaa59c51]::traits::wf::WfPredicates>::compute
  29:        0x10f291230 - rustc_trait_selection[b36b2923aaa59c51]::traits::wf::obligations
  30:        0x10f1dfa9c - <rustc_trait_selection[b36b2923aaa59c51]::traits::fulfill::FulfillProcessor as rustc_data_structures[c8f33e9f1943a882]::obligation_forest::ObligationProcessor>::process_obligation
  31:        0x10f23277c - <rustc_data_structures[c8f33e9f1943a882]::obligation_forest::ObligationForest<rustc_trait_selection[b36b2923aaa59c51]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[b36b2923aaa59c51]::traits::fulfill::FulfillProcessor>
  32:        0x10f1dd590 - <rustc_trait_selection[b36b2923aaa59c51]::traits::fulfill::FulfillmentContext as rustc_infer[38e46633d49da186]::traits::engine::TraitEngine>::select_where_possible
  33:        0x10da6bf6c - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::resolve_vars_with_obligations
  34:        0x10da70b0c - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::structurally_resolved_type
  35:        0x10da54184 - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_call
  36:        0x10daaa0c8 - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_expr_kind
  37:        0x10da644fc - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  38:        0x10daaa120 - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_expr_kind
  39:        0x10da644fc - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  40:        0x10da79a44 - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_decl
  41:        0x10da79e64 - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_stmt
  42:        0x10da7a5b4 - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_block_with_expected
  43:        0x10daa9d10 - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_expr_kind
  44:        0x10da644fc - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  45:        0x10da656dc - <rustc_hir_typeck[bb7242f866fd7396]::fn_ctxt::FnCtxt>::check_return_expr
  46:        0x10db42a50 - rustc_hir_typeck[bb7242f866fd7396]::check::check_fn
  47:        0x10daec604 - rustc_hir_typeck[bb7242f866fd7396]::typeck
  48:        0x10e924274 - <std[11e8f5d0c59412da]::thread::local::LocalKey<core[48081c40cc16d56a]::cell::Cell<*const ()>>>::with::<rustc_middle[741ab025093759e2]::ty::context::tls::enter_context<rustc_query_system[7201fc8115d54486]::query::plumbing::execute_job_incr<rustc_query_impl[4a148186806e296e]::queries::typeck, rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[741ab025093759e2]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[7201fc8115d54486]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[741ab025093759e2]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[7201fc8115d54486]::dep_graph::graph::DepNodeIndex)>
  49:        0x10e80a250 - rustc_query_system[7201fc8115d54486]::query::plumbing::try_execute_query::<rustc_query_impl[4a148186806e296e]::queries::typeck, rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>
  50:        0x10e7828d4 - rustc_query_system[7201fc8115d54486]::query::plumbing::force_query::<rustc_query_impl[4a148186806e296e]::queries::typeck, rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>
  51:        0x10e99de7c - <rustc_query_impl[4a148186806e296e]::plumbing::query_callback<rustc_query_impl[4a148186806e296e]::queries::typeck>::{closure#0} as core[48081c40cc16d56a]::ops::function::FnOnce<(rustc_middle[741ab025093759e2]::ty::context::TyCtxt, rustc_query_system[7201fc8115d54486]::dep_graph::dep_node::DepNode<rustc_middle[741ab025093759e2]::dep_graph::dep_node::DepKind>)>>::call_once
  52:        0x10e97bbe4 - <rustc_query_system[7201fc8115d54486]::dep_graph::graph::DepGraphData<rustc_middle[741ab025093759e2]::dep_graph::dep_node::DepKind>>::try_mark_previous_green::<rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>
  53:        0x10e97b89c - <rustc_query_system[7201fc8115d54486]::dep_graph::graph::DepGraphData<rustc_middle[741ab025093759e2]::dep_graph::dep_node::DepKind>>::try_mark_green::<rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>
  54:        0x10e8db668 - <std[11e8f5d0c59412da]::thread::local::LocalKey<core[48081c40cc16d56a]::cell::Cell<*const ()>>>::with::<rustc_middle[741ab025093759e2]::ty::context::tls::enter_context<rustc_query_system[7201fc8115d54486]::query::plumbing::execute_job_incr<rustc_query_impl[4a148186806e296e]::queries::typeck_item_bodies, rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>::{closure#1}, core[48081c40cc16d56a]::option::Option<(rustc_middle[741ab025093759e2]::query::erase::Erased<[u8; 0usize]>, rustc_query_system[7201fc8115d54486]::dep_graph::graph::DepNodeIndex)>>::{closure#0}, core[48081c40cc16d56a]::option::Option<(rustc_middle[741ab025093759e2]::query::erase::Erased<[u8; 0usize]>, rustc_query_system[7201fc8115d54486]::dep_graph::graph::DepNodeIndex)>>
  55:        0x10e7caea4 - rustc_query_system[7201fc8115d54486]::query::plumbing::try_execute_query::<rustc_query_impl[4a148186806e296e]::queries::typeck_item_bodies, rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>
  56:        0x10ea08648 - <rustc_query_impl[4a148186806e296e]::Queries as rustc_middle[741ab025093759e2]::ty::query::QueryEngine>::typeck_item_bodies
  57:        0x10dc2c274 - rustc_hir_analysis[d62de3e2f4dddc31]::check_crate
  58:        0x10b729808 - rustc_interface[8543ccb9fbf59e1b]::passes::analysis
  59:        0x10e9265a4 - <std[11e8f5d0c59412da]::thread::local::LocalKey<core[48081c40cc16d56a]::cell::Cell<*const ()>>>::with::<rustc_middle[741ab025093759e2]::ty::context::tls::enter_context<rustc_query_system[7201fc8115d54486]::query::plumbing::execute_job_incr<rustc_query_impl[4a148186806e296e]::queries::analysis, rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[741ab025093759e2]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[7201fc8115d54486]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[741ab025093759e2]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[7201fc8115d54486]::dep_graph::graph::DepNodeIndex)>
  60:        0x10e80b660 - rustc_query_system[7201fc8115d54486]::query::plumbing::try_execute_query::<rustc_query_impl[4a148186806e296e]::queries::analysis, rustc_query_impl[4a148186806e296e]::plumbing::QueryCtxt>
  61:        0x10e9ff658 - <rustc_query_impl[4a148186806e296e]::Queries as rustc_middle[741ab025093759e2]::ty::query::QueryEngine>::analysis
  62:        0x10b651d18 - <rustc_middle[741ab025093759e2]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[682bce9d94f8fc57]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>>
  63:        0x10b651688 - <rustc_interface[8543ccb9fbf59e1b]::interface::Compiler>::enter::<rustc_driver_impl[682bce9d94f8fc57]::run_compiler::{closure#1}::{closure#2}, core[48081c40cc16d56a]::result::Result<core[48081c40cc16d56a]::option::Option<rustc_interface[8543ccb9fbf59e1b]::queries::Linker>, rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>>
  64:        0x10b615590 - rustc_span[6c3f9550a9acf6ff]::set_source_map::<core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>, rustc_interface[8543ccb9fbf59e1b]::interface::run_compiler<core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>, rustc_driver_impl[682bce9d94f8fc57]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  65:        0x10b61ab7c - <scoped_tls[d422f7db1b3b2f94]::ScopedKey<rustc_span[6c3f9550a9acf6ff]::SessionGlobals>>::set::<rustc_interface[8543ccb9fbf59e1b]::interface::run_compiler<core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>, rustc_driver_impl[682bce9d94f8fc57]::run_compiler::{closure#1}>::{closure#0}, core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>>
  66:        0x10b60c2a0 - std[11e8f5d0c59412da]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[8543ccb9fbf59e1b]::util::run_in_thread_pool_with_globals<rustc_interface[8543ccb9fbf59e1b]::interface::run_compiler<core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>, rustc_driver_impl[682bce9d94f8fc57]::run_compiler::{closure#1}>::{closure#0}, core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>>
  67:        0x10b61fd6c - <<std[11e8f5d0c59412da]::thread::Builder>::spawn_unchecked_<rustc_interface[8543ccb9fbf59e1b]::util::run_in_thread_pool_with_globals<rustc_interface[8543ccb9fbf59e1b]::interface::run_compiler<core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>, rustc_driver_impl[682bce9d94f8fc57]::run_compiler::{closure#1}>::{closure#0}, core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[48081c40cc16d56a]::result::Result<(), rustc_span[6c3f9550a9acf6ff]::ErrorGuaranteed>>::{closure#1} as core[48081c40cc16d56a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  68:        0x103147cd4 - std::sys::unix::thread::Thread::new::thread_start::h2a953b47de327ee9
  69:        0x18c20ffa8 - __pthread_joiner_wake

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 1.71.0-nightly (b628260df 2023-04-22) running on aarch64-apple-darwin

note: compiler flags: -C embed-bitcode=no -C split-debuginfo=unpacked -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [typeck] type-checking `test_basic`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
there was a panic while trying to force a dep node
try_mark_green dep node stack:
#0 typeck_item_bodies(0-0)
end of try_mark_green dep node stack
error: could not compile `stream` (test "lib")

Backtrace

$ RUST_BACKTRACE=1 cargo test --features std -- --nocapture
   Compiling stream v0.1.0 (/Users/eric/git/stream-rs)
error: internal compiler error: compiler/rustc_middle/src/ty/subst.rs:915:9: const parameter `C/#3` (Const { ty: usize, kind: Param(C/#3) }/3) out of range when substituting substs=['_#38r, _, chacha20poly1305::ChaChaPoly1305<aes::cipher::StreamCipherCoreWrapper<chacha20::xchacha::XChaChaCore<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UTerm, aead::consts::B1>, aead::consts::B0>, aead::consts::B1>, aead::consts::B0>>>, aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UInt<aead::generic_array::typenum::UTerm, aead::consts::B1>, aead::consts::B1>, aead::consts::B0>, aead::consts::B0>, aead::consts::B0>>]

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/b628260df0587ae559253d8640ecb8738d3de613/compiler/rustc_errors/src/lib.rs:1643:9
stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
   1: <rustc_errors::HandlerInner>::bug::<&alloc::string::String>
   2: <rustc_errors::Handler>::bug::<&alloc::string::String>
   3: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>::{closure#0}
   4: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}
   5: rustc_middle::ty::context::tls::with_context_opt::<rustc_middle::ty::context::tls::with_opt<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
   6: rustc_middle::util::bug::bug_fmt
   7: <rustc_middle::ty::subst::SubstFolder>::const_param_out_of_range
   8: <rustc_middle::ty::subst::SubstFolder as rustc_type_ir::fold::TypeFolder<rustc_middle::ty::context::TyCtxt>>::fold_const
   9: rustc_middle::ty::util::fold_list::<rustc_middle::ty::subst::SubstFolder, rustc_middle::ty::subst::GenericArg, <&rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg> as rustc_type_ir::fold::TypeFoldable<rustc_middle::ty::context::TyCtxt>>::try_fold_with<rustc_middle::ty::subst::SubstFolder>::{closure#0}>
  10: <rustc_middle::ty::consts::kind::ConstKind as rustc_type_ir::fold::TypeFoldable<rustc_middle::ty::context::TyCtxt>>::try_fold_with::<rustc_middle::ty::subst::SubstFolder>
  11: <rustc_middle::ty::subst::SubstFolder as rustc_type_ir::fold::TypeFolder<rustc_middle::ty::context::TyCtxt>>::fold_const
  12: <rustc_middle::ty::Ty as rustc_type_ir::fold::TypeSuperFoldable<rustc_middle::ty::context::TyCtxt>>::super_fold_with::<rustc_middle::ty::subst::SubstFolder>
  13: <rustc_middle::ty::PredicateKind as rustc_type_ir::fold::TypeFoldable<rustc_middle::ty::context::TyCtxt>>::try_fold_with::<rustc_middle::ty::subst::SubstFolder>
  14: <alloc::vec::Vec<rustc_middle::ty::Predicate> as alloc::vec::spec_extend::SpecExtend<rustc_middle::ty::Predicate, core::iter::adapters::map::Map<core::slice::iter::Iter<(rustc_middle::ty::Predicate, rustc_span::span_encoding::Span)>, <rustc_middle::ty::generics::GenericPredicates>::instantiate_into::{closure#0}>>>::spec_extend
  15: <rustc_middle::ty::generics::GenericPredicates>::instantiate_into
  16: <rustc_middle::ty::generics::GenericPredicates>::instantiate
  17: <rustc_trait_selection::traits::wf::WfPredicates>::nominal_obligations_inner
  18: <rustc_trait_selection::traits::wf::WfPredicates>::compute
  19: rustc_trait_selection::traits::wf::obligations
  20: <rustc_trait_selection::traits::fulfill::FulfillProcessor as rustc_data_structures::obligation_forest::ObligationProcessor>::process_obligation
  21: <rustc_data_structures::obligation_forest::ObligationForest<rustc_trait_selection::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection::traits::fulfill::FulfillProcessor>
  22: <rustc_trait_selection::traits::fulfill::FulfillmentContext as rustc_infer::traits::engine::TraitEngine>::select_where_possible
  23: <rustc_hir_typeck::fn_ctxt::FnCtxt>::resolve_vars_with_obligations
  24: <rustc_hir_typeck::fn_ctxt::FnCtxt>::structurally_resolved_type
  25: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_call
  26: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_kind
  27: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  28: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_kind
  29: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  30: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_decl
  31: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_stmt
  32: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_block_with_expected
  33: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_kind
  34: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  35: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_return_expr
  36: rustc_hir_typeck::check::check_fn
  37: rustc_hir_typeck::typeck
  38: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_incr<rustc_query_impl::queries::typeck, rustc_query_impl::plumbing::QueryCtxt>::{closure#2}, (rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>
  39: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::typeck, rustc_query_impl::plumbing::QueryCtxt>
  40: rustc_query_system::query::plumbing::force_query::<rustc_query_impl::queries::typeck, rustc_query_impl::plumbing::QueryCtxt>
  41: <rustc_query_impl::plumbing::query_callback<rustc_query_impl::queries::typeck>::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_query_system::dep_graph::dep_node::DepNode<rustc_middle::dep_graph::dep_node::DepKind>)>>::call_once
  42: <rustc_query_system::dep_graph::graph::DepGraphData<rustc_middle::dep_graph::dep_node::DepKind>>::try_mark_previous_green::<rustc_query_impl::plumbing::QueryCtxt>
  43: <rustc_query_system::dep_graph::graph::DepGraphData<rustc_middle::dep_graph::dep_node::DepKind>>::try_mark_green::<rustc_query_impl::plumbing::QueryCtxt>
  44: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_incr<rustc_query_impl::queries::typeck_item_bodies, rustc_query_impl::plumbing::QueryCtxt>::{closure#1}, core::option::Option<(rustc_middle::query::erase::Erased<[u8; 0]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>>::{closure#0}, core::option::Option<(rustc_middle::query::erase::Erased<[u8; 0]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>>
  45: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::typeck_item_bodies, rustc_query_impl::plumbing::QueryCtxt>
  46: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck_item_bodies
  47: rustc_hir_analysis::check_crate
  48: rustc_interface::passes::analysis
  49: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_incr<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>::{closure#2}, (rustc_middle::query::erase::Erased<[u8; 1]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle::query::erase::Erased<[u8; 1]>, rustc_query_system::dep_graph::graph::DepNodeIndex)>
  50: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  51: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  52: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
  53: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
  54: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  55: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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 1.71.0-nightly (b628260df 2023-04-22) running on aarch64-apple-darwin

note: compiler flags: -C embed-bitcode=no -C split-debuginfo=unpacked -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [typeck] type-checking `test_basic`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
there was a panic while trying to force a dep node
try_mark_green dep node stack:
#0 typeck_item_bodies(0-0)
end of try_mark_green dep node stack
error: could not compile `stream` (test "lib")

[BoxyUwU]

there is no DEFAULT_CHUNK_SIZE anywhere in the linked code

[BoxyUwU]

This is probably #106994

[ericlagergren]

@BoxyUwU sorry, it was

const DEFAULT_CHUNK_SIZE: usize = 65536;
[...]
pub struct Writer<'a, W, A, const C: usize = DEFAULT_CHUNK_SIZE>
[...]