Error documenting code that uses min_const_generics

[Sauro98]

Code

The following code compiles just fine but when trying to run cargo doc on it I get the error described below

#![feature(min_const_generics)]

pub type CellIndex<const D:usize> = [i64;D];

fn main() {
    let index : CellIndex<2> = [0,1];
}

Meta

rustc --version --verbose:

rustc 1.47.0-nightly (de521cbb3 2020-08-21)
binary: rustc
commit-hash: de521cbb303c08febd9fa3755caccd4f3e491ea3
commit-date: 2020-08-21
host: x86_64-pc-windows-msvc
release: 1.47.0-nightly
LLVM version: 10.0

Error output

Documenting bug_repl v0.1.0 (C:\Users\ivado\Desktop\github_projects\bug_repl)
error: internal compiler error: src\librustc_middle\ty\subst.rs:568:17: const parameter `D/#0` (Const { ty: usize, val: Param(D/#0) }/0) out of range when substituting substs=[]

thread 'rustc' panicked at 'Box<Any>', /rustc/de521cbb303c08febd9fa3755caccd4f3e491ea3\src\librustc_errors\lib.rs:873:9

error: aborting due to previous error

error: Could not document `bug_repl`.

Caused by:
  process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name bug_repl src\main.rs -o C:\Users\ivado\Desktop\github_projects\bug_repl\target\doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=C:\Users\ivado\Desktop\github_projects\bug_repl\target\debug\deps --crate-version 0.1.0` (exit code: 1)

Backtrace

stack backtrace:
   0:     0x7ff9924fa419 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hfae6a97726d8b736
   1:     0x7ff9925275cc - core::fmt::write::hce2ddfec834877b8
   2:     0x7ff9924ebcd4 - <std::io::IoSlice as core::fmt::Debug>::fmt::h57a15d9f0ff2a3bc
   3:     0x7ff9924ffb5b - std::panicking::take_hook::h1925373a96008b93
   4:     0x7ff9924ff7a8 - std::panicking::take_hook::h1925373a96008b93
   5:     0x7ff97e88cf8a - rustc_driver::report_ice::h691a614479cbf5f9
   6:     0x7ff992500500 - std::panicking::rust_panic_with_hook::h7f7de81d557f54d3
   7:     0x7ff982a25e70 - ZN12rustc_middle2ty111_DERIVE_rustc_data_structures_stable_hasher_HashStable_rustc_middle_ich_StableHashingContext_ctx_FOR_SymbolName159_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc_middle..ich..hcx..StableHashingContext$GT$$u20$
   8:     0x7ff982a25de9 - ZN12rustc_middle2ty111_DERIVE_rustc_data_structures_stable_hasher_HashStable_rustc_middle_ich_StableHashingContext_ctx_FOR_SymbolName159_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc_middle..ich..hcx..StableHashingContext$GT$$u20$
   9:     0x7ff982837e61 - ZN12rustc_middle2ty5print6pretty66_DERIVE_rustc_middle_ty_Lift_lifted_FOR_TraitRefPrintOnlyTraitPath121_$LT$impl$u20$rustc_middle..ty..context..Lift$u20$for$u20$rustc_middle..ty..print..pretty..TraitRefPrintOnlyTraitPath$GT$11lift_to_tcx17hd76463984e41ae2
  10:     0x7ff982a1a099 - ZN12rustc_middle2ty111_DERIVE_rustc_data_structures_stable_hasher_HashStable_rustc_middle_ich_StableHashingContext_ctx_FOR_SymbolName159_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc_middle..ich..hcx..StableHashingContext$GT$$u20$
  11:     0x7ff982a1ae52 - ZN12rustc_middle2ty111_DERIVE_rustc_data_structures_stable_hasher_HashStable_rustc_middle_ich_StableHashingContext_ctx_FOR_SymbolName159_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc_middle..ich..hcx..StableHashingContext$GT$$u20$
  12:     0x7ff9828849be - rustc_middle::util::bug::bug_fmt::h582d9a3024b38eb2
  13:     0x7ff98287a730 - rustc_middle::ty::context::tls::ImplicitCtxt::new::hee3ec7f9c2036613
  14:     0x7ff98287a668 - rustc_middle::ty::context::tls::ImplicitCtxt::new::hee3ec7f9c2036613
  15:     0x7ff9828848cc - rustc_middle::util::bug::bug_fmt::h582d9a3024b38eb2
  16:     0x7ff982884885 - rustc_middle::util::bug::bug_fmt::h582d9a3024b38eb2
  17:     0x7ff982877c58 - <rustc_middle::ty::subst::SubstFolder as rustc_middle::ty::fold::TypeFolder>::fold_const::ha8c888812b2c4f15
  18:     0x7ff9817bd49b - rustc_mir::interpret::memory::Memory<M>::check_ptr_access_align::check_offset_align::h322ffaeebc9cba06
  19:     0x7ff9817dfd12 - rustc_mir::interpret::memory::Memory<M>::check_ptr_access_align::check_offset_align::h322ffaeebc9cba06
  20:     0x7ff9817dbdaa - rustc_mir::interpret::memory::Memory<M>::check_ptr_access_align::check_offset_align::h322ffaeebc9cba06
  21:     0x7ff9818d34e4 - rustc_mir::const_eval::eval_queries::const_eval_raw_provider::h651410244f0e96fc
  22:     0x7ff981888a1c - <rustc_mir::transform::validate::EdgeKind as core::fmt::Debug>::fmt::ha919b339641781e4
  23:     0x7ff98173c1b9 - <rustc_mir::interpret::machine::StackPopJump as core::fmt::Debug>::fmt::h666d775e581f4d45
  24:     0x7ff981787ab6 - <rustc_mir::transform::inline::CallSite as core::fmt::Debug>::fmt::hdd493ea1fcabadf1
  25:     0x7ff9815ca01c - <rustc_mir::shim::CallKind as core::fmt::Debug>::fmt::h605f0ad005b88cfc
  26:     0x7ff9818d138d - rustc_mir::const_eval::eval_queries::const_eval_validated_provider::hb2fbe61a076b869f
  27:     0x7ff98188937c - <rustc_mir::transform::validate::EdgeKind as core::fmt::Debug>::fmt::ha919b339641781e4
  28:     0x7ff981742bc7 - <rustc_mir::interpret::machine::StackPopJump as core::fmt::Debug>::fmt::h666d775e581f4d45
  29:     0x7ff98178a7c6 - <rustc_mir::transform::inline::CallSite as core::fmt::Debug>::fmt::hdd493ea1fcabadf1
  30:     0x7ff981598f2e - <rustc_mir::shim::CallKind as core::fmt::Debug>::fmt::h605f0ad005b88cfc
  31:     0x7ff9818d1135 - rustc_mir::const_eval::eval_queries::const_eval_validated_provider::hb2fbe61a076b869f
  32:     0x7ff98294c5fc - <rustc_middle::ty::cast::CastKind as core::fmt::Debug>::fmt::hd88d5cab8ffba004
  33:     0x7ff98278c44b - rustc_middle::ty::structural_impls::<impl rustc_middle::ty::context::Lift for rustc_ast::ast::Mutability>::lift_to_tcx::h477c6cc9462869f3
  34:     0x7ff982834738 - ZN12rustc_middle2ty5print6pretty66_DERIVE_rustc_middle_ty_Lift_lifted_FOR_TraitRefPrintOnlyTraitPath121_$LT$impl$u20$rustc_middle..ty..context..Lift$u20$for$u20$rustc_middle..ty..print..pretty..TraitRefPrintOnlyTraitPath$GT$11lift_to_tcx17hd76463984e41ae2
  35:     0x7ff9826bd267 - rustc_middle::ty::structural_impls::<impl rustc_middle::ty::context::Lift for rustc_ast::ast::Mutability>::lift_to_tcx::h477c6cc9462869f3
  36:     0x7ff982907f1c - rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id::h4e1fda7798274bbd
  37:     0x7ff982907aff - rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_poly::h5026915202dd971a
  38:     0x7ff657798fba - <unknown>
  39:     0x7ff6577a1bfe - <unknown>
  40:     0x7ff65778f379 - <unknown>
  41:     0x7ff6578a489e - <unknown>
  42:     0x7ff657af24d9 - <unknown>
  43:     0x7ff6579c6183 - <unknown>
  44:     0x7ff65787d3b5 - <unknown>
  45:     0x7ff6579c7ea0 - <unknown>
  46:     0x7ff65787a603 - <unknown>
  47:     0x7ff6577aee1a - <unknown>
  48:     0x7ff657800ddc - <unknown>
  49:     0x7ff6577bc4d5 - <unknown>
  50:     0x7ff657893c93 - <unknown>
  51:     0x7ff9925104ea - std::sys::windows::thread::Thread::new::h84550e08827b3a3a
  52:     0x7ff9ddaf7bd4 - BaseThreadInitThunk
  53:     0x7ff9ddc4ce51 - RtlUserThreadStart

[jyn514]

Making this even more strange, this does not panic with #![feature(const_generics)] instead.

 Documenting const-generics v0.1.0 (/home/joshua/test-rustdoc/const-generics)
warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
 --> src/main.rs:1:12
  |
1 | #![feature(const_generics)]
  |            ^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information

warning: 1 warning emitted

    Finished dev [unoptimized + debuginfo] target(s) in 0.57s

[jyn514]

Backtrace

error: internal compiler error: src/librustc_middle/ty/subst.rs:568:17: const parameter `D/#0` (Const { ty: usize, val: Param(D/#0) }/0) out of range when substituting substs=[]

thread 'rustc' panicked at 'Box<Any>', /home/joshua/rustc/library/std/src/macros.rs:13:23
stack backtrace:
   0: std::panicking::begin_panic
             at /home/joshua/rustc/library/std/src/panicking.rs:497
   1: rustc_errors::HandlerInner::span_bug
             at /home/joshua/rustc/library/std/src/macros.rs:13
   2: rustc_errors::Handler::span_bug
             at /home/joshua/rustc/src/librustc_errors/lib.rs:624
   3: rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/util/bug.rs:32
   4: rustc_middle::ty::context::tls::with_opt::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1789
   5: rustc_middle::ty::context::tls::with_context_opt
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1741
   6: rustc_middle::ty::context::tls::with_opt
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1789
   7: rustc_middle::util::bug::opt_span_bug_fmt
             at /home/joshua/rustc/src/librustc_middle/util/bug.rs:29
   8: rustc_middle::util::bug::span_bug_fmt
             at /home/joshua/rustc/src/librustc_middle/util/bug.rs:21
   9: rustc_middle::ty::subst::SubstFolder::const_for_param
  10: <rustc_middle::ty::subst::SubstFolder as rustc_middle::ty::fold::TypeFolder>::fold_const
             at /home/joshua/rustc/src/librustc_middle/ty/subst.rs:501
  11: rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::consts::Const>::fold_with
             at /home/joshua/rustc/src/librustc_middle/ty/structural_impls.rs:1087
  12: <T as rustc_middle::ty::subst::Subst>::subst_spanned
             at /home/joshua/rustc/src/librustc_middle/ty/subst.rs:428
  13: rustc_middle::ty::subst::Subst::subst
             at /home/joshua/rustc/src/librustc_middle/ty/subst.rs:409
  14: rustc_middle::ty::normalize_erasing_regions::<impl rustc_middle::ty::context::TyCtxt>::subst_and_normalize_erasing_regions
             at /home/joshua/rustc/src/librustc_middle/ty/normalize_erasing_regions.rs:80
  15: rustc_mir::interpret::eval_context::InterpCx<M>::subst_from_frame_and_normalize_erasing_regions
             at /home/joshua/rustc/src/librustc_mir/interpret/eval_context.rs:476
  16: rustc_mir::interpret::eval_context::InterpCx<M>::subst_from_current_frame_and_normalize_erasing_regions
             at /home/joshua/rustc/src/librustc_mir/interpret/eval_context.rs:465
  17: rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_operand
             at /home/joshua/rustc/src/librustc_mir/interpret/operand.rs:519
  18: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_rvalue_into_place
             at /home/joshua/rustc/src/librustc_mir/interpret/step.rs:166
  19: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::statement
             at /home/joshua/rustc/src/librustc_mir/interpret/step.rs:89
  20: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::step
             at /home/joshua/rustc/src/librustc_mir/interpret/step.rs:65
  21: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::run
             at /home/joshua/rustc/src/librustc_mir/interpret/step.rs:34
  22: rustc_mir::const_eval::eval_queries::eval_body_using_ecx
             at /home/joshua/rustc/src/librustc_mir/const_eval/eval_queries.rs:57
  23: rustc_mir::const_eval::eval_queries::const_eval_raw_provider::{{closure}}
             at /home/joshua/rustc/src/librustc_mir/const_eval/eval_queries.rs:319
  24: core::result::Result<T,E>::and_then
             at /home/joshua/rustc/library/core/src/result.rs:708
  25: rustc_mir::const_eval::eval_queries::const_eval_raw_provider
             at /home/joshua/rustc/src/librustc_mir/const_eval/eval_queries.rs:319
  26: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_raw>::compute
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:381
  27: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at /home/joshua/rustc/src/librustc_query_system/dep_graph/graph.rs:303
  28: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at /home/joshua/rustc/src/librustc_query_system/dep_graph/graph.rs:200
  29: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:599
  30: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:72
  31: stacker::maybe_grow
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/stacker-0.1.11/src/lib.rs:52
  32: rustc_data_structures::stack::ensure_sufficient_stack
             at /home/joshua/rustc/src/librustc_data_structures/stack.rs:16
  33: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:72
  34: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1724
  35: rustc_middle::ty::context::tls::set_tlv
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1708
  36: rustc_middle::ty::context::tls::enter_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1724
  37: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:71
  38: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1768
  39: rustc_middle::ty::context::tls::with_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1752
  40: rustc_middle::ty::context::tls::with_context_opt
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1741
  41: rustc_middle::ty::context::tls::with_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1752
  42: rustc_middle::ty::context::tls::with_related_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1765
  43: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:60
  44: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:589
  45: rustc_query_system::query::plumbing::with_diagnostics
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:296
  46: rustc_query_system::query::plumbing::force_query_with_job
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:588
  47: rustc_query_system::query::plumbing::try_execute_query
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:415
  48: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:639
  49: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at /home/joshua/rustc/src/librustc_query_system/query/caches.rs:110
  50: rustc_query_system::query::plumbing::try_get_cached
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:369
  51: rustc_query_system::query::plumbing::get_query_impl
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:631
  52: rustc_query_system::query::plumbing::get_query
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:731
  53: rustc_middle::ty::query::TyCtxtAt::const_eval_raw
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:491
  54: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::const_eval_raw
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:452
  55: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
             at /home/joshua/rustc/src/librustc_mir/const_eval/eval_queries.rs:262
  56: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:381
  57: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at /home/joshua/rustc/src/librustc_query_system/dep_graph/graph.rs:303
  58: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at /home/joshua/rustc/src/librustc_query_system/dep_graph/graph.rs:200
  59: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:599
  60: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:72
  61: stacker::maybe_grow
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/stacker-0.1.11/src/lib.rs:52
  62: rustc_data_structures::stack::ensure_sufficient_stack
             at /home/joshua/rustc/src/librustc_data_structures/stack.rs:16
  63: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:72
  64: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1724
  65: rustc_middle::ty::context::tls::set_tlv
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1708
  66: rustc_middle::ty::context::tls::enter_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1724
  67: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:71
  68: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1768
  69: rustc_middle::ty::context::tls::with_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1752
  70: rustc_middle::ty::context::tls::with_context_opt
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1741
  71: rustc_middle::ty::context::tls::with_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1752
  72: rustc_middle::ty::context::tls::with_related_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1765
  73: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:60
  74: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:589
  75: rustc_query_system::query::plumbing::with_diagnostics
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:296
  76: rustc_query_system::query::plumbing::force_query_with_job
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:588
  77: rustc_query_system::query::plumbing::try_execute_query
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:415
  78: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:639
  79: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at /home/joshua/rustc/src/librustc_query_system/query/caches.rs:110
  80: rustc_query_system::query::plumbing::try_get_cached
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:369
  81: rustc_query_system::query::plumbing::get_query_impl
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:631
  82: rustc_query_system::query::plumbing::get_query
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:731
  83: rustc_middle::ty::query::TyCtxtAt::const_eval_validated
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:491
  84: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::const_eval_validated
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:452
  85: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
             at /home/joshua/rustc/src/librustc_mir/const_eval/eval_queries.rs:239
  86: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:381
  87: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at /home/joshua/rustc/src/librustc_query_system/dep_graph/graph.rs:303
  88: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at /home/joshua/rustc/src/librustc_query_system/dep_graph/graph.rs:200
  89: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:599
  90: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:72
  91: stacker::maybe_grow
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/stacker-0.1.11/src/lib.rs:52
  92: rustc_data_structures::stack::ensure_sufficient_stack
             at /home/joshua/rustc/src/librustc_data_structures/stack.rs:16
  93: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:72
  94: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1724
  95: rustc_middle::ty::context::tls::set_tlv
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1708
  96: rustc_middle::ty::context::tls::enter_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1724
  97: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:71
  98: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1768
  99: rustc_middle::ty::context::tls::with_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1752
 100: rustc_middle::ty::context::tls::with_context_opt
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1741
 101: rustc_middle::ty::context::tls::with_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1752
 102: rustc_middle::ty::context::tls::with_related_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1765
 103: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at /home/joshua/rustc/src/librustc_middle/ty/query/plumbing.rs:60
 104: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:589
 105: rustc_query_system::query::plumbing::with_diagnostics
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:296
 106: rustc_query_system::query::plumbing::force_query_with_job
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:588
 107: rustc_query_system::query::plumbing::try_execute_query
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:415
 108: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:639
 109: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at /home/joshua/rustc/src/librustc_query_system/query/caches.rs:110
 110: rustc_query_system::query::plumbing::try_get_cached
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:369
 111: rustc_query_system::query::plumbing::get_query_impl
             at /home/joshua/rustc/src/librustc_query_system/query/plumbing.rs:631
 112: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id
 113: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_poly
             at /home/joshua/rustc/src/librustc_middle/mir/interpret/queries.rs:22
 114: <rustc_hir::hir::Ty as rustdoc::clean::Clean<rustdoc::clean::types::Type>>::clean
             at /home/joshua/rustc/src/librustdoc/clean/mod.rs:1367
 115: <rustdoc::doctree::Typedef as rustdoc::clean::Clean<rustdoc::clean::types::Item>>::clean
             at /home/joshua/rustc/src/librustdoc/clean/mod.rs:2042
 116: <rustdoc::doctree::Module as rustdoc::clean::Clean<rustdoc::clean::types::Item>>::clean::{{closure}}
             at /home/joshua/rustc/src/librustdoc/clean/mod.rs:247
 117: core::iter::adapters::map_fold::{{closure}}
             at /home/joshua/rustc/library/core/src/iter/adapters/mod.rs:825
 118: core::iter::traits::iterator::Iterator::fold
             at /home/joshua/rustc/library/core/src/iter/traits/iterator.rs:2004
 119: <core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
             at /home/joshua/rustc/library/core/src/iter/adapters/mod.rs:865
 120: core::iter::traits::iterator::Iterator::for_each
             at /home/joshua/rustc/library/core/src/iter/traits/iterator.rs:651
 121: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::spec_extend
             at /home/joshua/rustc/library/alloc/src/vec.rs:2165
 122: <alloc::vec::Vec<T> as core::iter::traits::collect::Extend<T>>::extend
             at /home/joshua/rustc/library/alloc/src/vec.rs:2088
 123: <rustdoc::doctree::Module as rustdoc::clean::Clean<rustdoc::clean::types::Item>>::clean
             at /home/joshua/rustc/src/librustdoc/clean/mod.rs:247
 124: rustdoc::clean::utils::krate
             at /home/joshua/rustc/src/librustdoc/clean/utils.rs:43
 125: rustdoc::core::run_core::{{closure}}::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustdoc/core.rs:516
 126: rustc_interface::passes::QueryContext::enter::{{closure}}
             at /home/joshua/rustc/src/librustc_interface/passes.rs:721
 127: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1724
 128: rustc_middle::ty::context::tls::set_tlv
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1708
 129: rustc_middle::ty::context::tls::enter_context
             at /home/joshua/rustc/src/librustc_middle/ty/context.rs:1724
 130: rustc_interface::passes::QueryContext::enter
             at /home/joshua/rustc/src/librustc_interface/passes.rs:721
 131: rustdoc::core::run_core::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustdoc/core.rs:451
 132: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
             at /home/joshua/rustc/src/librustc_interface/queries.rs:385
 133: rustdoc::core::run_core::{{closure}}
             at /home/joshua/rustc/src/librustdoc/core.rs:413
 134: rustc_interface::interface::create_compiler_and_run::{{closure}}
             at /home/joshua/rustc/src/librustc_interface/interface.rs:191
 135: rustc_span::with_source_map
             at /home/joshua/rustc/src/librustc_span/lib.rs:743
 136: rustc_interface::interface::create_compiler_and_run
             at /home/joshua/rustc/src/librustc_interface/interface.rs:185
 137: rustdoc::core::run_core
             at /home/joshua/rustc/src/librustdoc/core.rs:412
 138: rustdoc::main_options
             at /home/joshua/rustc/src/librustdoc/lib.rs:504
 139: rustdoc::main_args::{{closure}}
             at /home/joshua/rustc/src/librustdoc/lib.rs:438
 140: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}::{{closure}}
             at /home/joshua/rustc/src/librustc_interface/util.rs:148
 141: scoped_tls::ScopedKey<T>::set
             at /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137
 142: rustc_span::with_session_globals
             at /home/joshua/rustc/src/librustc_span/lib.rs:91
 143: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}
             at /home/joshua/rustc/src/librustc_interface/util.rs:144
 144: rustc_interface::util::scoped_thread::{{closure}}
             at /home/joshua/rustc/src/librustc_interface/util.rs:119
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Rustdoc code:

rust/src/librustdoc/clean/mod.rs

Lines 1366 to 1367 in 668ef72

	let def_id = cx.tcx.hir().local_def_id(length.hir_id);
	let length = match cx.tcx.const_eval_poly(def_id.to_def_id()) {

[jyn514]

The main function is not necessary, it also crashes on

#![feature(min_const_generics)]

pub type CellIndex<const D: usize> = [i64; D];

[jyn514]

Yeah this one is beyond me, I have no idea why this is breaking.

[jyn514]

This never worked with #![min_const_generics]; on 2020-08-08 it says the feature isn't recognized and on 09 it crashes.

$ cargo +nightly-2020-08-08 doc
 Documenting const-generics v0.1.0 (/home/joshua/test-rustdoc/const-generics)
error[E0658]: const generics are unstable
 --> src/lib.rs:4:26
  |
4 | pub type CellIndex<const D: usize> = [i64; D];
  |                          ^
  |
  = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
  = help: add `#![feature(const_generics)]` to the crate attributes to enable

error: Compilation failed, aborting rustdoc

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.
error: Could not document `const-generics`.

Caused by:
  process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name const_generics src/lib.rs -o /home/joshua/.local/lib/cargo/target/doc --error-format=json --json=diagnostic-rendered-ansi -L dependency=/home/joshua/.local/lib/cargo/target/debug/deps --crate-version 0.1.0` (exit code: 1)
$ cargo +nightly-2020-08-09 doc
 Documenting const-generics v0.1.0 (/home/joshua/test-rustdoc/const-generics)
error: internal compiler error: src/librustc_middle/ty/subst.rs:569:17: const parameter `D/#0` (Const { ty: usize, val: Param(D/#0) }/0) out of range when substituting substs=[]

thread 'rustc' panicked at 'Box<Any>', /rustc/ceedf1d5febd65b012b8bcd513d70a0a6a091210/src/librustc_errors/lib.rs:870:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: Unrecognized option: 'crate-version'

error: aborting due to previous error

error: Could not document `const-generics`.

Caused by:
  process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name const_generics src/lib.rs -o /home/joshua/.local/lib/cargo/target/doc --error-format=json --json=diagnostic-rendered-ansi -L dependency=/home/joshua/.local/lib/cargo/target/debug/deps --crate-version 0.1.0` (exit code: 1)

[camelid]

Huh, I built that last code snippet in the Rust Playground and it compiled fine: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=f467ccf519a00f5eceacff66a0c1f7a4

[jyn514]

@camelid yes, it only crashes with rustdoc, which isn't available on the playground.