ICE with const _: () = panic!(String::new());

[rodrimati1992]

Code

#![feature(const_panic)]

const _: () = panic!(String::new());

Meta

rustc --version --verbose:

rustc 1.47.0-nightly (7e6d6e5f5 2020-08-16)
binary: rustc
commit-hash: 7e6d6e5f535321c2223f044caba16f97b825009c
commit-date: 2020-08-16
host: i686-unknown-linux-gnu
release: 1.47.0-nightly
LLVM version: 10.0

Error output

error: internal compiler error: src/librustc_mir/interpret/operand.rs:327:13: primitive read failed for type: std::string::String
 --> src/lib.rs:3:15
  |
3 | const _: () = panic!(String::new());
  |               ^^^^^^^^^^^^^^^^^^^^^
  |
  = note: this error: internal compiler error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

thread 'rustc' panicked at 'Box<Any>', /rustc/7e6d6e5f535321c2223f044caba16f97b825009c/src/librustc_errors/lib.rs:873:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

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 1.47.0-nightly (7e6d6e5f5 2020-08-16) running on i686-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type lib

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

error: aborting due to previous error

error: could not compile `foo`.

Backtrace

   Compiling foo v0.1.0 (/home/matias/Documents/eclipse_workspace/tmp/foo)
error: internal compiler error: src/librustc_mir/interpret/operand.rs:327:13: primitive read failed for type: std::string::String
 --> src/lib.rs:3:15
  |
3 | const _: () = panic!(String::new());
  |               ^^^^^^^^^^^^^^^^^^^^^
  |
  = note: this error: internal compiler error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

thread 'rustc' panicked at 'Box<Any>', /rustc/7e6d6e5f535321c2223f044caba16f97b825009c/src/librustc_errors/lib.rs:873:9
stack backtrace:
   0: std::panicking::begin_panic
   1: rustc_errors::HandlerInner::span_bug
   2: rustc_errors::Handler::span_bug
   3: rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}
   4: rustc_middle::ty::context::tls::with_opt::{{closure}}
   5: rustc_middle::ty::context::tls::with_opt
   6: rustc_middle::util::bug::opt_span_bug_fmt
   7: rustc_middle::util::bug::span_bug_fmt
   8: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::deref_operand
   9: rustc_mir::const_eval::machine::<impl rustc_mir::interpret::eval_context::InterpCx<rustc_mir::const_eval::machine::CompileTimeInterpreter>>::hook_panic_fn
  10: <rustc_mir::const_eval::machine::CompileTimeInterpreter as rustc_mir::interpret::machine::Machine>::find_mir_or_eval_fn
  11: rustc_mir::interpret::terminator::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_fn_call
  12: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::run
  13: rustc_mir::const_eval::eval_queries::const_eval_raw_provider
  14: 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
  15: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  16: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  17: rustc_data_structures::stack::ensure_sufficient_stack
  18: rustc_query_system::query::plumbing::get_query_impl
  19: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
  20: 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
  21: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  22: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  23: rustc_data_structures::stack::ensure_sufficient_stack
  24: rustc_query_system::query::plumbing::get_query_impl
  25: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
  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_validated>::compute
  27: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  28: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  29: rustc_data_structures::stack::ensure_sufficient_stack
  30: rustc_query_system::query::plumbing::get_query_impl
  31: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id
  32: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_poly
  33: <rustc_lint::BuiltinCombinedLateLintPass as rustc_lint::passes::LateLintPass>::check_item
  34: rustc_hir::intravisit::Visitor::visit_nested_item
  35: rustc_hir::intravisit::walk_crate
  36: rustc_lint::late::late_lint_crate
  37: rustc_session::utils::<impl rustc_session::session::Session>::time
  38: rustc_session::utils::<impl rustc_session::session::Session>::time
  39: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
  40: rustc_session::utils::<impl rustc_session::session::Session>::time
  41: rustc_interface::passes::analysis
  42: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
  43: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  44: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  45: rustc_data_structures::stack::ensure_sufficient_stack
  46: rustc_query_system::query::plumbing::get_query_impl
  47: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  48: rustc_span::with_source_map
  49: rustc_interface::interface::create_compiler_and_run
  50: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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 1.47.0-nightly (7e6d6e5f5 2020-08-16) running on i686-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type lib

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

query stack during panic:
#0 [const_eval_raw] const-evaluating `_`
#1 [const_eval_validated] const-evaluating + checking `_`
#2 [const_eval_validated] const-evaluating + checking `_`
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error

error: could not compile `foo`.

[josephlr]

Seems like a duplicate of (or related to) #66693

[Alexendoo]

Fixed by #80734