ICE "region scope ... not in scope to drop"

[jruderman]

Found with a modified fuzz-rustc

Code

#![allow(dead_code)]

const N: usize = {
    struct U;
    ! let y = 42;
    3
};

struct S {
    x: [(); N]
}

fn main() {}

Error output

rsr.rs:5:7: error: expected expression, found `let` statement
rsr.rs:5:7: error: `let` expressions are not supported here
rsr.rs:5:7: error[E0658]: `let` expressions in this position are unstable
rsr.rs:5:11: error: internal compiler error: compiler/rustc_mir_build/src/build/scope.rs:935:9: region scope Remainder { block: 11, first_statement_index: 0} not in scope to drop _4

Backtrace

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/7eef946fc0e0eff40e588eab77b09b287accbec3/compiler/rustc_errors/src/lib.rs:967:33
stack backtrace:
   0:        0x10e4fa7a2 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hde9930b8710af522
   1:        0x10e5525ea - core::fmt::write::hd25ec0bfc1849a2f
   2:        0x10e4ec87c - std::io::Write::write_fmt::hca36d7396c5dc18b
   3:        0x10e4fa56a - std::sys_common::backtrace::print::hc155979e9e33e658
   4:        0x10e4fd946 - std::panicking::default_hook::{{closure}}::h03db778ae686f347
   5:        0x10e4fd697 - std::panicking::default_hook::h0d9e8bcb55be071f
   6:        0x1190577dd - rustc_driver[77a613ab63d15aac]::DEFAULT_HOOK::{closure#0}::{closure#0}
   7:        0x10e4fe145 - std::panicking::rust_panic_with_hook::h758520931cfdfde5
   8:        0x11c2c5667 - std[11391ffec397fd56]::panicking::begin_panic::<rustc_errors[ec87cacb996b1da1]::ExplicitBug>::{closure#0}
   9:        0x11c2c0629 - std[11391ffec397fd56]::sys_common::backtrace::__rust_end_short_backtrace::<std[11391ffec397fd56]::panicking::begin_panic<rustc_errors[ec87cacb996b1da1]::ExplicitBug>::{closure#0}, !>
  10:        0x11dda1999 - std[11391ffec397fd56]::panicking::begin_panic::<rustc_errors[ec87cacb996b1da1]::ExplicitBug>
  11:        0x11c2dfa19 - std[11391ffec397fd56]::panic::panic_any::<rustc_errors[ec87cacb996b1da1]::ExplicitBug>
  12:        0x11c2df2e8 - <rustc_errors[ec87cacb996b1da1]::HandlerInner>::span_bug::<rustc_span[48482e0f8f724117]::span_encoding::Span, &alloc[a05f3e7fdaf4d80f]::string::String>
  13:        0x11c2df08e - <rustc_errors[ec87cacb996b1da1]::Handler>::span_bug::<rustc_span[48482e0f8f724117]::span_encoding::Span, &alloc[a05f3e7fdaf4d80f]::string::String>
  14:        0x11c271261 - rustc_middle[b315a0ebd84f913d]::ty::context::tls::with_context_opt::<rustc_middle[b315a0ebd84f913d]::ty::context::tls::with_opt<rustc_middle[b315a0ebd84f913d]::util::bug::opt_span_bug_fmt<rustc_span[48482e0f8f724117]::span_encoding::Span>::{closure#0}, ()>::{closure#0}, ()>
  15:        0x11c270f81 - rustc_middle[b315a0ebd84f913d]::util::bug::opt_span_bug_fmt::<rustc_span[48482e0f8f724117]::span_encoding::Span>
  16:        0x11dda095f - rustc_middle[b315a0ebd84f913d]::util::bug::span_bug_fmt::<rustc_span[48482e0f8f724117]::span_encoding::Span>
  17:        0x11c2603d0 - <rustc_mir_build[603c590c528b19b]::build::Builder>::schedule_drop
  18:        0x11c25c768 - <rustc_mir_build[603c590c528b19b]::build::Builder>::bind_and_guard_matched_candidate
  19:        0x11c254b8d - <rustc_mir_build[603c590c528b19b]::build::Builder>::bind_pattern
  20:        0x11c25bd72 - <rustc_mir_build[603c590c528b19b]::build::Builder>::lower_let_expr
  21:        0x11c264033 - <rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest
  22:        0x11c262a6a - <rustc_mir_build[603c590c528b19b]::build::Builder>::as_temp_inner
  23:        0x11c261d0a - <rustc_mir_build[603c590c528b19b]::build::Builder>::as_operand
  24:        0x11c262096 - <rustc_mir_build[603c590c528b19b]::build::Builder>::as_operand
  25:        0x11c24d08e - <rustc_mir_build[603c590c528b19b]::build::Builder>::as_rvalue
  26:        0x11c262d0f - <rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest
  27:        0x11c262a6a - <rustc_mir_build[603c590c528b19b]::build::Builder>::as_temp_inner
  28:        0x11c251560 - <rustc_mir_build[603c590c528b19b]::build::Builder>::stmt_expr
  29:        0x11c251764 - <rustc_mir_build[603c590c528b19b]::build::Builder>::stmt_expr
  30:        0x11c246482 - <rustc_mir_build[603c590c528b19b]::build::Builder>::ast_block_stmts
  31:        0x11c269786 - <rustc_mir_build[603c590c528b19b]::build::Builder>::in_scope::<<rustc_mir_build[603c590c528b19b]::build::Builder>::ast_block::{closure#2}::{closure#0}, ()>
  32:        0x11c264c49 - <rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest
  33:        0x11c26a170 - <rustc_mir_build[603c590c528b19b]::build::Builder>::in_scope::<<rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest::{closure#0}::{closure#0}, ()>
  34:        0x11c266d6d - <rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest::{closure#0}
  35:        0x11c264536 - <rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest
  36:        0x11c26a170 - <rustc_mir_build[603c590c528b19b]::build::Builder>::in_scope::<<rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest::{closure#0}::{closure#0}, ()>
  37:        0x11c266d6d - <rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest::{closure#0}
  38:        0x11c264536 - <rustc_mir_build[603c590c528b19b]::build::Builder>::expr_into_dest
  39:        0x11c242648 - rustc_mir_build[603c590c528b19b]::build::mir_build
  40:        0x11c23fcb2 - rustc_mir_build[603c590c528b19b]::build::mir_built
  41:        0x11c896eba - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_middle[b315a0ebd84f913d]::ty::WithOptConstParam<rustc_span[48482e0f8f724117]::def_id::LocalDefId>, &rustc_data_structures[d9a04b93d3448b55]::steal::Steal<rustc_middle[b315a0ebd84f913d]::mir::Body>>>
  42:        0x11c9c2eb5 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::mir_built, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  43:        0x11ca68c97 - <rustc_query_impl[44c1f9c305efea75]::Queries as rustc_middle[b315a0ebd84f913d]::ty::query::QueryEngine>::mir_built
  44:        0x11bdf22bc - rustc_mir_transform[908f959bb72ad5af]::check_unsafety::unsafety_check_result
  45:        0x11bdee44b - <rustc_mir_transform[908f959bb72ad5af]::check_unsafety::provide::{closure#0} as core[cfd2f0869b685cd6]::ops::function::FnOnce<(rustc_middle[b315a0ebd84f913d]::ty::context::TyCtxt, rustc_span[48482e0f8f724117]::def_id::LocalDefId)>>::call_once
  46:        0x11c8c79e9 - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_span[48482e0f8f724117]::def_id::LocalDefId, &rustc_middle[b315a0ebd84f913d]::mir::query::UnsafetyCheckResult>>
  47:        0x11c9b996c - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::unsafety_check_result, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  48:        0x11bd951a1 - rustc_mir_transform[908f959bb72ad5af]::mir_const
  49:        0x11c896eba - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_middle[b315a0ebd84f913d]::ty::WithOptConstParam<rustc_span[48482e0f8f724117]::def_id::LocalDefId>, &rustc_data_structures[d9a04b93d3448b55]::steal::Steal<rustc_middle[b315a0ebd84f913d]::mir::Body>>>
  50:        0x11c9c2fe2 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::mir_const, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  51:        0x11ca68cc7 - <rustc_query_impl[44c1f9c305efea75]::Queries as rustc_middle[b315a0ebd84f913d]::ty::query::QueryEngine>::mir_const
  52:        0x11bd94143 - rustc_mir_transform[908f959bb72ad5af]::mir_const_qualif
  53:        0x11bd7f144 - <rustc_mir_transform[908f959bb72ad5af]::provide::{closure#0} as core[cfd2f0869b685cd6]::ops::function::FnOnce<(rustc_middle[b315a0ebd84f913d]::ty::context::TyCtxt, rustc_span[48482e0f8f724117]::def_id::DefId)>>::call_once
  54:        0x11c8f1e2c - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_span[48482e0f8f724117]::def_id::DefId, rustc_middle[b315a0ebd84f913d]::mir::query::ConstQualifs>>
  55:        0x11c9b35e6 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::mir_const_qualif, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  56:        0x11bd9593e - rustc_mir_transform[908f959bb72ad5af]::mir_promoted
  57:        0x11c8980e0 - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_middle[b315a0ebd84f913d]::ty::WithOptConstParam<rustc_span[48482e0f8f724117]::def_id::LocalDefId>, (&rustc_data_structures[d9a04b93d3448b55]::steal::Steal<rustc_middle[b315a0ebd84f913d]::mir::Body>, &rustc_data_structures[d9a04b93d3448b55]::steal::Steal<rustc_index[975aea96e92c3aa6]::vec::IndexVec<rustc_middle[b315a0ebd84f913d]::mir::Promoted, rustc_middle[b315a0ebd84f913d]::mir::Body>>)>>
  58:        0x11c9ae8c8 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::mir_promoted, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  59:        0x11ca68e87 - <rustc_query_impl[44c1f9c305efea75]::Queries as rustc_middle[b315a0ebd84f913d]::ty::query::QueryEngine>::mir_promoted
  60:        0x11c43f996 - rustc_borrowck[92a4f20c78c2d7a9]::mir_borrowck
  61:        0x11c420685 - <rustc_borrowck[92a4f20c78c2d7a9]::provide::{closure#0} as core[cfd2f0869b685cd6]::ops::function::FnOnce<(rustc_middle[b315a0ebd84f913d]::ty::context::TyCtxt, rustc_span[48482e0f8f724117]::def_id::LocalDefId)>>::call_once
  62:        0x11c8c67c9 - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_span[48482e0f8f724117]::def_id::LocalDefId, &rustc_middle[b315a0ebd84f913d]::mir::query::BorrowCheckResult>>
  63:        0x11c9ae633 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::mir_borrowck, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  64:        0x11d8d3a62 - <rustc_middle[b315a0ebd84f913d]::ty::context::TyCtxt>::mir_borrowck_opt_const_arg
  65:        0x11bd96cac - rustc_mir_transform[908f959bb72ad5af]::mir_drops_elaborated_and_const_checked
  66:        0x11c896eba - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_middle[b315a0ebd84f913d]::ty::WithOptConstParam<rustc_span[48482e0f8f724117]::def_id::LocalDefId>, &rustc_data_structures[d9a04b93d3448b55]::steal::Steal<rustc_middle[b315a0ebd84f913d]::mir::Body>>>
  67:        0x11c9c0f82 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::mir_drops_elaborated_and_const_checked, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  68:        0x11ca68e07 - <rustc_query_impl[44c1f9c305efea75]::Queries as rustc_middle[b315a0ebd84f913d]::ty::query::QueryEngine>::mir_drops_elaborated_and_const_checked
  69:        0x11bd96910 - rustc_mir_transform[908f959bb72ad5af]::inner_mir_for_ctfe
  70:        0x11bd96218 - rustc_mir_transform[908f959bb72ad5af]::mir_for_ctfe
  71:        0x11c8fa515 - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_span[48482e0f8f724117]::def_id::DefId, &rustc_middle[b315a0ebd84f913d]::mir::Body>>
  72:        0x11c9ae785 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::mir_for_ctfe, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  73:        0x11c72ec91 - <rustc_const_eval[d893f35e951f968e]::const_eval::machine::CompileTimeInterpreter as rustc_const_eval[d893f35e951f968e]::interpret::machine::Machine>::load_mir
  74:        0x11c6830fc - <rustc_const_eval[d893f35e951f968e]::interpret::eval_context::InterpCx<rustc_const_eval[d893f35e951f968e]::const_eval::machine::CompileTimeInterpreter>>::load_mir
  75:        0x11c6db3b3 - rustc_const_eval[d893f35e951f968e]::const_eval::eval_queries::eval_to_allocation_raw_provider
  76:        0x11c88beaf - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_middle[b315a0ebd84f913d]::ty::ParamEnvAnd<rustc_middle[b315a0ebd84f913d]::mir::interpret::GlobalId>, core[cfd2f0869b685cd6]::result::Result<rustc_middle[b315a0ebd84f913d]::mir::interpret::value::ConstAlloc, rustc_middle[b315a0ebd84f913d]::mir::interpret::error::ErrorHandled>>>
  77:        0x11c9ba20a - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::eval_to_allocation_raw, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  78:        0x11ca69a71 - <rustc_query_impl[44c1f9c305efea75]::Queries as rustc_middle[b315a0ebd84f913d]::ty::query::QueryEngine>::eval_to_allocation_raw
  79:        0x11c68488d - <rustc_const_eval[d893f35e951f968e]::interpret::eval_context::InterpCx<rustc_const_eval[d893f35e951f968e]::const_eval::machine::CompileTimeInterpreter>>::eval_to_allocation
  80:        0x11c691faa - <rustc_const_eval[d893f35e951f968e]::interpret::eval_context::InterpCx<rustc_const_eval[d893f35e951f968e]::const_eval::machine::CompileTimeInterpreter>>::const_to_op
  81:        0x11c6a433f - <rustc_const_eval[d893f35e951f968e]::interpret::eval_context::InterpCx<rustc_const_eval[d893f35e951f968e]::const_eval::machine::CompileTimeInterpreter>>::push_stack_frame
  82:        0x11c6db973 - rustc_const_eval[d893f35e951f968e]::const_eval::eval_queries::eval_to_allocation_raw_provider
  83:        0x11c88beaf - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_middle[b315a0ebd84f913d]::ty::ParamEnvAnd<rustc_middle[b315a0ebd84f913d]::mir::interpret::GlobalId>, core[cfd2f0869b685cd6]::result::Result<rustc_middle[b315a0ebd84f913d]::mir::interpret::value::ConstAlloc, rustc_middle[b315a0ebd84f913d]::mir::interpret::error::ErrorHandled>>>
  84:        0x11c9ba20a - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::eval_to_allocation_raw, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  85:        0x11ca69a71 - <rustc_query_impl[44c1f9c305efea75]::Queries as rustc_middle[b315a0ebd84f913d]::ty::query::QueryEngine>::eval_to_allocation_raw
  86:        0x11c6db05a - rustc_const_eval[d893f35e951f968e]::const_eval::eval_queries::eval_to_allocation_raw_provider
  87:        0x11c88beaf - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_middle[b315a0ebd84f913d]::ty::ParamEnvAnd<rustc_middle[b315a0ebd84f913d]::mir::interpret::GlobalId>, core[cfd2f0869b685cd6]::result::Result<rustc_middle[b315a0ebd84f913d]::mir::interpret::value::ConstAlloc, rustc_middle[b315a0ebd84f913d]::mir::interpret::error::ErrorHandled>>>
  88:        0x11c9ba20a - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::eval_to_allocation_raw, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  89:        0x11ca69a71 - <rustc_query_impl[44c1f9c305efea75]::Queries as rustc_middle[b315a0ebd84f913d]::ty::query::QueryEngine>::eval_to_allocation_raw
  90:        0x11c6e379a - rustc_const_eval[d893f35e951f968e]::const_eval::eval_to_valtree
  91:        0x11c6b86c3 - <rustc_const_eval[d893f35e951f968e]::provide::{closure#0} as core[cfd2f0869b685cd6]::ops::function::FnOnce<(rustc_middle[b315a0ebd84f913d]::ty::context::TyCtxt, rustc_middle[b315a0ebd84f913d]::ty::ParamEnvAnd<rustc_middle[b315a0ebd84f913d]::mir::interpret::GlobalId>)>>::call_once
  92:        0x11c88a73b - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_middle[b315a0ebd84f913d]::ty::ParamEnvAnd<rustc_middle[b315a0ebd84f913d]::mir::interpret::GlobalId>, core[cfd2f0869b685cd6]::result::Result<core[cfd2f0869b685cd6]::option::Option<rustc_middle[b315a0ebd84f913d]::ty::consts::valtree::ValTree>, rustc_middle[b315a0ebd84f913d]::mir::interpret::error::ErrorHandled>>>
  93:        0x11c9b16bd - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::eval_to_valtree, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
  94:        0x11ca69b71 - <rustc_query_impl[44c1f9c305efea75]::Queries as rustc_middle[b315a0ebd84f913d]::ty::query::QueryEngine>::eval_to_valtree
  95:        0x11d8ea447 - <rustc_middle[b315a0ebd84f913d]::ty::context::TyCtxt>::const_eval_global_id_for_typeck
  96:        0x11d8e9461 - <rustc_middle[b315a0ebd84f913d]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
  97:        0x11d55c655 - <rustc_middle[b315a0ebd84f913d]::ty::consts::Const>::eval
  98:        0x11d568d85 - <rustc_trait_selection[e9a02f98259a9cc7]::traits::project::AssocTypeNormalizer as rustc_middle[b315a0ebd84f913d]::ty::fold::TypeFolder>::fold_const
  99:        0x11d669469 - <rustc_middle[b315a0ebd84f913d]::ty::Ty as rustc_middle[b315a0ebd84f913d]::ty::fold::TypeSuperFoldable>::super_fold_with::<rustc_trait_selection[e9a02f98259a9cc7]::traits::project::AssocTypeNormalizer>
 100:        0x11bbbfa4e - <rustc_trait_selection[e9a02f98259a9cc7]::traits::project::AssocTypeNormalizer>::fold::<rustc_middle[b315a0ebd84f913d]::ty::Ty>
 101:        0x11bbc686c - rustc_trait_selection[e9a02f98259a9cc7]::traits::project::normalize::<rustc_middle[b315a0ebd84f913d]::ty::Ty>
 102:        0x11bb5a3e3 - <rustc_trait_selection[e9a02f98259a9cc7]::traits::engine::ObligationCtxt>::normalize::<rustc_middle[b315a0ebd84f913d]::ty::Ty>
 103:        0x11bbe0410 - rustc_hir_analysis[ad14f4770cb1b48d]::check::wfcheck::check_type_defn
 104:        0x11bbd8628 - rustc_hir_analysis[ad14f4770cb1b48d]::check::wfcheck::check_well_formed
 105:        0x11c8b6555 - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_hir[1f62500b68f0e116]::hir_id::OwnerId, ()>>
 106:        0x11c9b4485 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::check_well_formed, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
 107:        0x11bade11b - rustc_data_structures[d9a04b93d3448b55]::sync::par_for_each_in::<&[rustc_hir[1f62500b68f0e116]::hir::ItemId], <rustc_middle[b315a0ebd84f913d]::hir::ModuleItems>::par_items<rustc_hir_analysis[ad14f4770cb1b48d]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>
 108:        0x11bbe5441 - rustc_hir_analysis[ad14f4770cb1b48d]::check::wfcheck::check_mod_type_wf
 109:        0x11c8c9e45 - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<rustc_span[48482e0f8f724117]::def_id::LocalDefId, ()>>
 110:        0x11c9b4365 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::check_mod_type_wf, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
 111:        0x11bade21b - rustc_data_structures[d9a04b93d3448b55]::sync::par_for_each_in::<&[rustc_hir[1f62500b68f0e116]::hir_id::OwnerId], <rustc_middle[b315a0ebd84f913d]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[ad14f4770cb1b48d]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>
 112:        0x11bb472d0 - <rustc_session[ae5bb785c2cd4c22]::session::Session>::track_errors::<rustc_hir_analysis[ad14f4770cb1b48d]::check_crate::{closure#5}, ()>
 113:        0x11baf0b92 - rustc_hir_analysis[ad14f4770cb1b48d]::check_crate
 114:        0x11919e84a - rustc_interface[a0d981abc9377f30]::passes::analysis
 115:        0x11c947b5c - rustc_query_system[69ea88315c8057f7]::query::plumbing::try_execute_query::<rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt, rustc_query_system[69ea88315c8057f7]::query::caches::DefaultCache<(), core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>>>
 116:        0x11c9c1f19 - rustc_query_system[69ea88315c8057f7]::query::plumbing::get_query::<rustc_query_impl[44c1f9c305efea75]::queries::analysis, rustc_query_impl[44c1f9c305efea75]::plumbing::QueryCtxt>
 117:        0x1190737e6 - <rustc_interface[a0d981abc9377f30]::passes::QueryContext>::enter::<rustc_driver[77a613ab63d15aac]::run_compiler::{closure#1}::{closure#2}::{closure#3}, core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>>
 118:        0x1190b7f5d - rustc_span[48482e0f8f724117]::with_source_map::<core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>, rustc_interface[a0d981abc9377f30]::interface::run_compiler<core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>, rustc_driver[77a613ab63d15aac]::run_compiler::{closure#1}>::{closure#0}::{closure#1}>
 119:        0x1190a7a7c - <scoped_tls[46b3c18c0a12f0bc]::ScopedKey<rustc_span[48482e0f8f724117]::SessionGlobals>>::set::<rustc_interface[a0d981abc9377f30]::interface::run_compiler<core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>, rustc_driver[77a613ab63d15aac]::run_compiler::{closure#1}>::{closure#0}, core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>>
 120:        0x1190773ca - std[11391ffec397fd56]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[a0d981abc9377f30]::util::run_in_thread_pool_with_globals<rustc_interface[a0d981abc9377f30]::interface::run_compiler<core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>, rustc_driver[77a613ab63d15aac]::run_compiler::{closure#1}>::{closure#0}, core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>>
 121:        0x11905d4cb - <<std[11391ffec397fd56]::thread::Builder>::spawn_unchecked_<rustc_interface[a0d981abc9377f30]::util::run_in_thread_pool_with_globals<rustc_interface[a0d981abc9377f30]::interface::run_compiler<core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>, rustc_driver[77a613ab63d15aac]::run_compiler::{closure#1}>::{closure#0}, core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[cfd2f0869b685cd6]::result::Result<(), rustc_errors[ec87cacb996b1da1]::ErrorGuaranteed>>::{closure#1} as core[cfd2f0869b685cd6]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
 122:        0x10e5071f7 - std::sys::unix::thread::Thread::new::thread_start::ha121f0b94f5d418a
 123:     0x7ff814d514e1 - __pthread_start

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 1.67.0-nightly (7eef946fc 2022-11-06) running on x86_64-apple-darwin

query stack during panic:
#0 [mir_built] building MIR for `N`
#1 [unsafety_check_result] unsafety-checking `N`
#2 [mir_const] preparing `N` for borrow checking
#3 [mir_const_qualif] const checking `N`
#4 [mir_promoted] processing MIR for `N`
#5 [mir_borrowck] borrow-checking `N`
#6 [mir_drops_elaborated_and_const_checked] elaborating drops for `N`
#7 [mir_for_ctfe] caching mir of `N` for CTFE
#8 [eval_to_allocation_raw] const-evaluating + checking `N`
#9 [eval_to_allocation_raw] const-evaluating + checking `S::x::{constant#0}`
#10 [eval_to_allocation_raw] const-evaluating + checking `S::x::{constant#0}`
#11 [eval_to_valtree] evaluating type-level constant
#12 [check_well_formed] checking that `S` is well-formed
#13 [check_mod_type_wf] checking that types are well-formed in top-level module
#14 [analysis] running analysis passes on this crate
end of query stack

Regression

Regression in nightly-2021-08-17, maybe from #80357

Version

rustc 1.67.0-nightly (7eef946fc 2022-11-06)
binary: rustc
commit-hash: 7eef946fc0e0eff40e588eab77b09b287accbec3
commit-date: 2022-11-06
host: x86_64-apple-darwin
release: 1.67.0-nightly
LLVM version: 15.0.4

[Noratrieb]

We should not be building MIR for code that is broken like this. No surprise that MIR building can't handle it, it shouldn't.