Crash on const expr overflow followed by display

[lgarczyn]

Code

#![cfg(test)]

#[test]
fn test_nz() {
    const u8:u8 = 40u32.pow(2) as u8;
    dbg!(u8);
}

Meta

note: rustc 1.53.0-nightly (d0695c908 2021-04-12) running on x86_64-unknown-linux-gnu

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

Error output

query stack during panic:
#0 [predicates_of] computing predicates of `std::fmt::Display`
#1 [typeck] type-checking `test_nz`
#2 [typeck_item_bodies] type-checking all item bodies
#3 [analysis] running analysis passes on this crate

thread 'rustc' panicked at 'assertion failed: `(left == right)`
  left: `Some(Fingerprint(709981240673635011, 11067457998711857432))`,
 right: `Some(Fingerprint(18243125685095569025, 15011316703844057886))`: found unstable fingerprints for predicates_of(core[ec89]::fmt::Display): GenericPredicates { parent: None, predicates: [(Binder(TraitPredicate(<Self as std::fmt::Display>), []), /home/user/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:644:1: 644:18 (#0))] }', /rustc/d0695c9081b16077d0aed368bccaf437d77ff497/compiler/rustc_query_system/src/query/plumbing.rs:593:5

Backtrace

   0: rust_begin_unwind
             at /rustc/d0695c9081b16077d0aed368bccaf437d77ff497/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/d0695c9081b16077d0aed368bccaf437d77ff497/library/core/src/panicking.rs:92:14
   2: core::panicking::assert_failed_inner
   3: core::panicking::assert_failed
   4: rustc_query_system::query::plumbing::incremental_verify_ich
   5: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
   6: rustc_query_system::query::plumbing::get_query_impl
   7: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::predicates_of
   8: rustc_middle::ty::generics::GenericPredicates::instantiate_into
   9: rustc_middle::ty::generics::GenericPredicates::instantiate
  10: rustc_typeck::check::fn_ctxt::_impl::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::instantiate_bounds
  11: rustc_typeck::check::fn_ctxt::_impl::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::add_required_obligations
  12: rustc_typeck::check::fn_ctxt::_impl::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::instantiate_value_path
  13: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  14: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  15: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
  16: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
  17: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
  18: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  19: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  20: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  21: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  22: rustc_typeck::check::_match::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_match
  23: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  24: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  25: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  26: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  27: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
  28: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
  29: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
  30: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  31: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  32: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
  33: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
  34: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
  35: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  36: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  37: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_stmt
  38: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
  39: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  40: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_stmt
  41: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
  42: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  43: rustc_typeck::check::_match::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_match
  44: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  45: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  46: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_stmt
  47: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
  48: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  49: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_return_expr
  50: rustc_typeck::check::check::check_fn
  51: rustc_infer::infer::InferCtxtBuilder::enter
  52: rustc_typeck::check::typeck
  53: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  54: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  55: rustc_data_structures::stack::ensure_sufficient_stack
  56: rustc_query_system::query::plumbing::force_query_with_job
  57: rustc_query_system::query::plumbing::get_query_impl
  58: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
  59: rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::par_body_owners
  60: rustc_typeck::check::typeck_item_bodies
  61: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  62: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  63: rustc_data_structures::stack::ensure_sufficient_stack
  64: rustc_query_system::query::plumbing::force_query_with_job
  65: rustc_query_system::query::plumbing::get_query_impl
  66: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck_item_bodies
  67: rustc_session::utils::<impl rustc_session::session::Session>::time
  68: rustc_typeck::check_crate
  69: rustc_interface::passes::analysis
  70: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  71: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  72: rustc_data_structures::stack::ensure_sufficient_stack
  73: rustc_query_system::query::plumbing::force_query_with_job
  74: rustc_query_system::query::plumbing::get_query_impl
  75: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  76: rustc_interface::passes::QueryContext::enter
  77: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  78: rustc_span::with_source_map
  79: rustc_interface::interface::create_compiler_and_run
  80: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[osa1]

How do I reproduce this? Just building it with cargo +nightly build in a library, or with rustc +nightly test.rs --crate-type=rlib do not generate any errors.

[lgarczyn]

After running rustup default stable then rustup default nightly, the crash has disappeared. I have no more information, sorry.

I was testing out const_panic to try and get casting overflow errors in const expr

[lgarczyn]

Managed to recreate it, it's probably due to my macro library

Here's the full project as it was during the last crash: https://github.com/lgarczyn/polymorphic-constant/tree/rust-crash

To cause the crash simply run cargo test on nightly

[wesleywiser]

Thanks for filing the bug report! We just shipped a patch release to work around this issue and are currently triaging related issues related to ensure each underlying problem gets resolved. Since this appears to be a duplicate of #83259, I'm going to close in favor of that issue.