ICE: panicked at 'index out of bounds: the len is 0 but the index is 0', compiler/rustc_middle/src/ty/subst.rs

[chengniansun]

Code

#[lang = "owned_box"]
struct Foo;
fn main() {
    Foo
}

Meta

rustc --version --verbose:

rustc 1.53.0-nightly (07e0e2ec2 2021-03-24)
binary: rustc
commit-hash: 07e0e2ec268c140e607e1ac7f49f145612d0f597
commit-date: 2021-03-24
host: x86_64-unknown-linux-gnu
release: 1.53.0-nightly
LLVM version: 12.0.0

Error output

error[E0658]: language items are subject to change
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:1
  |
1 | #[lang = "owned_box"]
  | ^^^^^^^^^^^^^^^^^^^^^
  |
  = help: add `#![feature(lang_items)]` to the crate attributes to enable

error[E0152]: found duplicate lang item `owned_box`
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:2:1
  |
2 | struct Foo;
  | ^^^^^^^^^^^
  |
  = note: the lang item is first defined in crate `alloc` (which `std` depends on)
  = note: first definition in `alloc` loaded from /home/cnsun/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-3aeb407930ebd519.rlib
  = note: second definition in the local crate (`perses_node_priority_with_dfs_delta_reduced_mutant`)

thread 'rustc' panicked at 'index out of bounds: the len is 0 but the index is 0', compiler/rustc_middle/src/ty/subst.rs:302:43
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

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 1.53.0-nightly (07e0e2ec2 2021-03-24) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `main`
#1 [typeck_item_bodies] type-checking all item bodies
end of query stack
error: aborting due to 2 previous errors

Some errors have detailed explanations: E0152, E0658.
For more information about an error, try `rustc --explain E0152`.

Backtrace

error[E0658]: language items are subject to change
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:1
  |
1 | #[lang = "owned_box"]
  | ^^^^^^^^^^^^^^^^^^^^^
  |
  = help: add `#![feature(lang_items)]` to the crate attributes to enable

error[E0152]: found duplicate lang item `owned_box`
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:2:1
  |
2 | struct Foo;
  | ^^^^^^^^^^^
  |
  = note: the lang item is first defined in crate `alloc` (which `std` depends on)
  = note: first definition in `alloc` loaded from /home/cnsun/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-3aeb407930ebd519.rlib
  = note: second definition in the local crate (`perses_node_priority_with_dfs_delta_reduced_mutant`)

thread 'rustc' panicked at 'index out of bounds: the len is 0 but the index is 0', compiler/rustc_middle/src/ty/subst.rs:302:43
stack backtrace:
   0: rust_begin_unwind
             at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:92:14
   2: core::panicking::panic_bounds_check
             at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:69:5
   3: rustc_middle::ty::sty::<impl rustc_middle::ty::TyS>::boxed_ty
   4: rustc_middle::ty::sty::<impl rustc_middle::ty::TyS>::builtin_deref
   5: <rustc_trait_selection::autoderef::Autoderef as core::iter::traits::iterator::Iterator>::next
   6: rustc_typeck::check::coercion::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::deref_steps
   7: rustc_typeck::check::demand::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_ref
   8: rustc_typeck::check::fn_ctxt::suggestions::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::suggest_deref_ref_or_into
   9: rustc_typeck::check::demand::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::emit_coerce_suggestions
  10: rustc_typeck::check::coercion::CoerceMany<E>::coerce_inner
  11: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
  12: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  13: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_return_expr
  14: rustc_typeck::check::check::check_fn
  15: rustc_infer::infer::InferCtxtBuilder::enter
  16: rustc_typeck::check::typeck
  17: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  18: rustc_query_system::query::plumbing::force_query_with_job
  19: rustc_query_system::query::plumbing::get_query_impl
  20: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
  21: rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::par_body_owners
  22: rustc_typeck::check::typeck_item_bodies
  23: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  24: rustc_data_structures::stack::ensure_sufficient_stack
  25: rustc_query_system::query::plumbing::force_query_with_job
  26: rustc_query_system::query::plumbing::get_query_impl
  27: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck_item_bodies
  28: rustc_session::utils::<impl rustc_session::session::Session>::time
  29: rustc_typeck::check_crate
  30: rustc_interface::passes::analysis
  31: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  32: rustc_data_structures::stack::ensure_sufficient_stack
  33: rustc_query_system::query::plumbing::force_query_with_job
  34: rustc_query_system::query::plumbing::get_query_impl
  35: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  36: rustc_interface::passes::QueryContext::enter
  37: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  38: rustc_span::with_source_map
  39: rustc_interface::interface::create_compiler_and_run
  40: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: internal compiler error: unexpected panic

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 1.53.0-nightly (07e0e2ec2 2021-03-24) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `main`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 2 previous errors

Some errors have detailed explanations: E0152, E0658.
For more information about an error, try `rustc --explain E0152`.

[Alexendoo]

No longer ICEs since #87875

[JohnTitor]

The test has been added by #95714, closing.