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Const generic defaults ICE: No bound vars found #93647

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DutchGhost opened this issue Feb 4, 2022 · 11 comments · Fixed by #93669
Closed

Const generic defaults ICE: No bound vars found #93647

DutchGhost opened this issue Feb 4, 2022 · 11 comments · Fixed by #93669
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@compiler-errors
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C-bug Category: This is a bug. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-critical Critical priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@DutchGhost
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DutchGhost commented Feb 4, 2022 •
edited by rustbot
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Const generic defaults are being stabilized, #90207.

Code

struct X<const N: usize = {
    async move {}
}>;

Meta

rustc --version --verbose:

rustc 1.60.0-nightly (4e8fb743c 2022-02-03)

Error output

error: internal compiler error: compiler/rustc_middle/src/ty/context.rs:2720:21: No bound vars found for "expr {} (hir_id=HirId { owner: DefId(0:3 ~ playground[ea18]::X), local_id: 10 })" (HirId { owner: DefId(0:3 ~ playground[ea18]::X), local_id: 10 })
Backtrace 

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1160:9
stack backtrace:
   0:     0x7f2e91a70ebc - std::backtrace_rs::backtrace::libunwind::trace::hddd5a7e459ce4327
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f2e91a70ebc - std::backtrace_rs::backtrace::trace_unsynchronized::h69db3e09cfd8bf11
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f2e91a70ebc - std::sys_common::backtrace::_print_fmt::h83b461b46804fdab
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f2e91a70ebc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2f6e5cd8872f3d74
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f2e91ad22dc - core::fmt::write::hd64a00f3787c90bd
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/core/src/fmt/mod.rs:1190:17
   5:     0x7f2e91a60383 - std::io::Write::write_fmt::h6347402c88d40325
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/io/mod.rs:1653:15
   6:     0x7f2e91a75181 - std::sys_common::backtrace::_print::h989064c3e0b39e3c
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f2e91a75181 - std::sys_common::backtrace::print::h4af8c55ce731a045
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f2e91a75181 - std::panicking::default_hook::{{closure}}::h41ef6f6a9fac6b53
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/panicking.rs:295:22
   9:     0x7f2e91a74e3f - std::panicking::default_hook::hbaf11e031e0e4a5f
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/panicking.rs:314:9
  10:     0x7f2e92252541 - rustc_driver[7b59b981d4c23d31]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f2e91a75a5b - std::panicking::rust_panic_with_hook::h4788f0bd625b1005
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/panicking.rs:702:17
  12:     0x7f2e93316281 - std[daefdbcf0dca51d0]::panicking::begin_panic::<rustc_errors[b77837aed2b0d3e7]::ExplicitBug>::{closure#0}
  13:     0x7f2e933161f6 - std[daefdbcf0dca51d0]::sys_common::backtrace::__rust_end_short_backtrace::<std[daefdbcf0dca51d0]::panicking::begin_panic<rustc_errors[b77837aed2b0d3e7]::ExplicitBug>::{closure#0}, !>
  14:     0x7f2e9331aa2f - std[daefdbcf0dca51d0]::panicking::begin_panic::<rustc_errors[b77837aed2b0d3e7]::ExplicitBug>
  15:     0x7f2e933270cd - std[daefdbcf0dca51d0]::panic::panic_any::<rustc_errors[b77837aed2b0d3e7]::ExplicitBug>
  16:     0x7f2e9332637d - <rustc_errors[b77837aed2b0d3e7]::HandlerInner>::bug
  17:     0x7f2e93325ed0 - <rustc_errors[b77837aed2b0d3e7]::Handler>::bug
  18:     0x7f2e931ac6d9 - rustc_middle[e664fb30aec2b69e]::ty::context::tls::with_opt::<rustc_middle[e664fb30aec2b69e]::util::bug::opt_span_bug_fmt<rustc_span[26d1c5a8904e1196]::span_encoding::Span>::{closure#0}, ()>
  19:     0x7f2e931ad830 - rustc_middle[e664fb30aec2b69e]::util::bug::opt_span_bug_fmt::<rustc_span[26d1c5a8904e1196]::span_encoding::Span>
  20:     0x7f2e931ad7a6 - rustc_middle[e664fb30aec2b69e]::util::bug::bug_fmt
  21:     0x7f2e93f9d473 - <rustc_middle[e664fb30aec2b69e]::ty::context::TyCtxt>::late_bound_vars
  22:     0x7f2e9431d895 - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::supplied_sig_of_closure
  23:     0x7f2e9361a04e - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::check_expr_closure
  24:     0x7f2e9361d95e - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::check_expr_kind
  25:     0x7f2e93602eaa - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::check_argument_types
  26:     0x7f2e935d99f9 - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::confirm_builtin_call
  27:     0x7f2e935d65ba - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::check_call
  28:     0x7f2e9361abf0 - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::check_expr_kind
  29:     0x7f2e935e1a06 - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  30:     0x7f2e936099ab - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::check_block_with_expected
  31:     0x7f2e935e1a06 - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  32:     0x7f2e9369a18e - <rustc_infer[835d7697e80d8145]::infer::InferCtxtBuilder>::enter::<&rustc_middle[e664fb30aec2b69e]::ty::context::TypeckResults, <rustc_typeck[95242508bb98a5fb]::check::inherited::InheritedBuilder>::enter<rustc_typeck[95242508bb98a5fb]::check::typeck_with_fallback<rustc_typeck[95242508bb98a5fb]::check::typeck::{closure#0}>::{closure#1}, &rustc_middle[e664fb30aec2b69e]::ty::context::TypeckResults>::{closure#0}>
  33:     0x7f2e93671432 - rustc_typeck[95242508bb98a5fb]::check::typeck
  34:     0x7f2e93b1c077 - rustc_query_system[59fab566a51c2c24]::query::plumbing::try_execute_query::<rustc_query_impl[ae50953882263c5d]::plumbing::QueryCtxt, rustc_query_system[59fab566a51c2c24]::query::caches::DefaultCache<rustc_span[26d1c5a8904e1196]::def_id::LocalDefId, &rustc_middle[e664fb30aec2b69e]::ty::context::TypeckResults>>
  35:     0x7f2e93b7aacc - <rustc_query_impl[ae50953882263c5d]::Queries as rustc_middle[e664fb30aec2b69e]::ty::query::QueryEngine>::typeck
  36:     0x7f2e93f8cbf2 - <rustc_middle[e664fb30aec2b69e]::ty::context::TyCtxt>::typeck_opt_const_arg
  37:     0x7f2e93a87721 - rustc_const_eval[55e19033940159c7]::const_eval::eval_queries::eval_to_allocation_raw_provider
  38:     0x7f2e93b09a9c - rustc_query_system[59fab566a51c2c24]::query::plumbing::try_execute_query::<rustc_query_impl[ae50953882263c5d]::plumbing::QueryCtxt, rustc_query_system[59fab566a51c2c24]::query::caches::DefaultCache<rustc_middle[e664fb30aec2b69e]::ty::ParamEnvAnd<rustc_middle[e664fb30aec2b69e]::mir::interpret::GlobalId>, core[90c82cfbe27f5d33]::result::Result<rustc_middle[e664fb30aec2b69e]::mir::interpret::value::ConstAlloc, rustc_middle[e664fb30aec2b69e]::mir::interpret::error::ErrorHandled>>>
  39:     0x7f2e93b7aebf - <rustc_query_impl[ae50953882263c5d]::Queries as rustc_middle[e664fb30aec2b69e]::ty::query::QueryEngine>::eval_to_allocation_raw
  40:     0x7f2e93a869b2 - rustc_const_eval[55e19033940159c7]::const_eval::eval_queries::eval_to_const_value_raw_provider
  41:     0x7f2e93b0a94b - rustc_query_system[59fab566a51c2c24]::query::plumbing::try_execute_query::<rustc_query_impl[ae50953882263c5d]::plumbing::QueryCtxt, rustc_query_system[59fab566a51c2c24]::query::caches::DefaultCache<rustc_middle[e664fb30aec2b69e]::ty::ParamEnvAnd<rustc_middle[e664fb30aec2b69e]::mir::interpret::GlobalId>, core[90c82cfbe27f5d33]::result::Result<rustc_middle[e664fb30aec2b69e]::mir::interpret::value::ConstValue, rustc_middle[e664fb30aec2b69e]::mir::interpret::error::ErrorHandled>>>
  42:     0x7f2e93b7b07b - <rustc_query_impl[ae50953882263c5d]::Queries as rustc_middle[e664fb30aec2b69e]::ty::query::QueryEngine>::eval_to_const_value_raw
  43:     0x7f2e93f82b4a - <rustc_middle[e664fb30aec2b69e]::ty::context::TyCtxt>::const_eval_global_id
  44:     0x7f2e94908a49 - <rustc_middle[e664fb30aec2b69e]::ty::context::TyCtxt>::const_eval_resolve
  45:     0x7f2e948ab391 - <rustc_infer[835d7697e80d8145]::infer::InferCtxt>::const_eval_resolve
  46:     0x7f2e9487f659 - rustc_trait_selection[99ac7681cfb15a86]::traits::const_evaluatable::is_const_evaluatable
  47:     0x7f2e93e6a679 - <rustc_trait_selection[99ac7681cfb15a86]::traits::fulfill::FulfillProcessor>::progress_changed_obligations
  48:     0x7f2e93e73834 - <rustc_data_structures[9901de6203b925f4]::obligation_forest::ObligationForest<rustc_trait_selection[99ac7681cfb15a86]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[99ac7681cfb15a86]::traits::fulfill::FulfillProcessor, rustc_data_structures[9901de6203b925f4]::obligation_forest::Outcome<rustc_trait_selection[99ac7681cfb15a86]::traits::fulfill::PendingPredicateObligation, rustc_infer[835d7697e80d8145]::traits::FulfillmentErrorCode>>
  49:     0x7f2e93e66198 - <rustc_trait_selection[99ac7681cfb15a86]::traits::fulfill::FulfillmentContext as rustc_infer[835d7697e80d8145]::traits::engine::TraitEngine>::select_all_or_error
  50:     0x7f2e93627da5 - <rustc_typeck[95242508bb98a5fb]::check::fn_ctxt::FnCtxt>::select_all_obligations_or_error
  51:     0x7f2e9435fba7 - <rustc_infer[835d7697e80d8145]::infer::InferCtxtBuilder>::enter::<(), <rustc_typeck[95242508bb98a5fb]::check::inherited::InheritedBuilder>::enter<<rustc_typeck[95242508bb98a5fb]::check::wfcheck::CheckWfFcxBuilder>::with_fcx<rustc_typeck[95242508bb98a5fb]::check::wfcheck::check_type_defn<rustc_typeck[95242508bb98a5fb]::check::wfcheck::check_item_well_formed::{closure#2}>::{closure#0}>::{closure#0}, ()>::{closure#0}>
  52:     0x7f2e936f5aae - rustc_typeck[95242508bb98a5fb]::check::wfcheck::check_item_well_formed
  53:     0x7f2e93b1ed9e - rustc_query_system[59fab566a51c2c24]::query::plumbing::try_execute_query::<rustc_query_impl[ae50953882263c5d]::plumbing::QueryCtxt, rustc_query_system[59fab566a51c2c24]::query::caches::DefaultCache<rustc_span[26d1c5a8904e1196]::def_id::LocalDefId, ()>>
  54:     0x7f2e93b80ee5 - <rustc_query_impl[ae50953882263c5d]::Queries as rustc_middle[e664fb30aec2b69e]::ty::query::QueryEngine>::check_item_well_formed
  55:     0x7f2e936bfb74 - <rustc_middle[e664fb30aec2b69e]::hir::map::Map>::par_visit_all_item_likes::<rustc_typeck[95242508bb98a5fb]::check::wfcheck::CheckTypeWellFormedVisitor>
  56:     0x7f2e9435421c - <rustc_session[bcbf86d149cb5e94]::session::Session>::track_errors::<rustc_typeck[95242508bb98a5fb]::check_crate::{closure#5}, ()>
  57:     0x7f2e943397cb - rustc_typeck[95242508bb98a5fb]::check_crate
  58:     0x7f2e940ec287 - rustc_interface[be440f50dcda62f9]::passes::analysis
  59:     0x7f2e94584729 - rustc_query_system[59fab566a51c2c24]::query::plumbing::try_execute_query::<rustc_query_impl[ae50953882263c5d]::plumbing::QueryCtxt, rustc_query_system[59fab566a51c2c24]::query::caches::DefaultCache<(), core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>>>
  60:     0x7f2e945c28a5 - rustc_query_system[59fab566a51c2c24]::query::plumbing::get_query::<rustc_query_impl[ae50953882263c5d]::queries::analysis, rustc_query_impl[ae50953882263c5d]::plumbing::QueryCtxt>
  61:     0x7f2e940c280d - <rustc_interface[be440f50dcda62f9]::passes::QueryContext>::enter::<rustc_driver[7b59b981d4c23d31]::run_compiler::{closure#1}::{closure#2}::{closure#3}, core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>>
  62:     0x7f2e940c081a - <rustc_interface[be440f50dcda62f9]::interface::Compiler>::enter::<rustc_driver[7b59b981d4c23d31]::run_compiler::{closure#1}::{closure#2}, core[90c82cfbe27f5d33]::result::Result<core[90c82cfbe27f5d33]::option::Option<rustc_interface[be440f50dcda62f9]::queries::Linker>, rustc_errors[b77837aed2b0d3e7]::ErrorReported>>
  63:     0x7f2e940c3876 - rustc_span[26d1c5a8904e1196]::with_source_map::<core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>, rustc_interface[be440f50dcda62f9]::interface::create_compiler_and_run<core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>, rustc_driver[7b59b981d4c23d31]::run_compiler::{closure#1}>::{closure#1}>
  64:     0x7f2e940c01fe - rustc_interface[be440f50dcda62f9]::interface::create_compiler_and_run::<core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>, rustc_driver[7b59b981d4c23d31]::run_compiler::{closure#1}>
  65:     0x7f2e940a6302 - std[daefdbcf0dca51d0]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[be440f50dcda62f9]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[be440f50dcda62f9]::interface::run_compiler<core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>, rustc_driver[7b59b981d4c23d31]::run_compiler::{closure#1}>::{closure#0}, core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>>::{closure#0}, core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>>
  66:     0x7f2e940a3a19 - <<std[daefdbcf0dca51d0]::thread::Builder>::spawn_unchecked_<rustc_interface[be440f50dcda62f9]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[be440f50dcda62f9]::interface::run_compiler<core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>, rustc_driver[7b59b981d4c23d31]::run_compiler::{closure#1}>::{closure#0}, core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>>::{closure#0}, core[90c82cfbe27f5d33]::result::Result<(), rustc_errors[b77837aed2b0d3e7]::ErrorReported>>::{closure#1} as core[90c82cfbe27f5d33]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  67:     0x7f2e91a81803 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hed49a6c6e767ba83
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/alloc/src/boxed.rs:1854:9
  68:     0x7f2e91a81803 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h14238373d01dc9bc
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/alloc/src/boxed.rs:1854:9
  69:     0x7f2e91a81803 - std::sys::unix::thread::Thread::new::thread_start::hc6dbf73cd24f68cc
                               at /rustc/4e8fb743ccbec27344b2dd42de7057f41d4ebfdd/library/std/src/sys/unix/thread.rs:108:17
  70:     0x7f2e919b5609 - start_thread
  71:     0x7f2e918cf293 - clone
  72:                0x0 - <unknown>

@DutchGhost DutchGhost added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Feb 4, 2022
@DutchGhost
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Seems to also happen with closures:

struct X<const N: usize = {
    || {}
}>;

@compiler-errors
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I got a fix for this one I think.

@rustbot claim

@compiler-errors compiler-errors mentioned this issue Feb 5, 2022
Merged
@rust-lang-glacier-bot rust-lang-glacier-bot added the glacier ICE tracked in rust-lang/glacier. label Feb 5, 2022
@lcnr lcnr added beta-nominated Nominated for backporting to the compiler in the beta channel. I-nominated and removed beta-nominated Nominated for backporting to the compiler in the beta channel. labels Feb 5, 2022
@lcnr
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lcnr commented Feb 5, 2022

even worse, this compiles on beta but shouldn't

struct Foo<'a, const N: usize = {
    let x: &'a ();
    3
}>(&'a ());

@lcnr lcnr added I-prioritize Issue: Indicates that prioritization has been requested for this issue. and removed I-nominated labels Feb 5, 2022
@apiraino
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apiraino commented Feb 5, 2022

Assigning priority as discussed in the Zulip thread of the Prioritization Working Group.

@rustbot label -I-prioritize +P-critical

@rustbot rustbot added P-critical Critical priority and removed I-prioritize Issue: Indicates that prioritization has been requested for this issue. labels Feb 5, 2022
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Feb 5, 2022
@matthiaskrgr
Rollup merge of rust-lang#93669 - compiler-errors:const-generic-args,…
64eb1f4 
… r=lcnr

Resolve lifetimes for const generic defaults

We weren't visiting the const generic default argument in `rustc_resolve::late::lifetimes`. This seems to fix the issue, and we deny any non-`'static` lifetimes anyways.

Fixes rust-lang#93647
@bors bors closed this as completed in cbf4b46 Feb 6, 2022
@BoxyUwU
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BoxyUwU commented Feb 6, 2022

I think this needs to remain open until the fix is beta-backported 🤔 not 100% sure on procedure here

@BoxyUwU BoxyUwU reopened this Feb 6, 2022
@compiler-errors
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You might be correct. At least that's what happened last time one of my PRs was backport nominated (here), though I'm not sure if that was due to that being a regression on stable. Regardless, thanks for reopening this.

@apiraino
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apiraino commented Feb 6, 2022

@compiler-errors that's my understading, too. I /think/ issues that are pending a beta/stable backport (like this one) will stay open until the corresponding backport PR has landed.
The {stable,beta}-backport procedure is detailed here but this detail is not explicited (I'll see if I can fix that to be more clear).

For completeness, backports are discussed every Thursday during the compiler team weekly meeting (happening on Zulip).

Anyway, thanks a lot for fixing this issue and also to @DutchGhost + @lcnr for reporting and debugging :)

This was referenced Feb 7, 2022
Merged
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@jackh726
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jackh726 commented Feb 7, 2022

Copied from Zulip:

Question/thought: Is this a case where tracking bound vars got in the way? Or did it actually help uncover a potential bug?

@compiler-errors
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compiler-errors commented Feb 7, 2022 •
edited
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Is this a case where tracking bound vars got in the way? Or did it actually help uncover a potential bug?

Not sure what you mean. The bug was that we were just not doing lifetime name resolution at all on const generic defaults. Like this code compiles on beta:

struct X<const N: usize = {
    let x: &'a String; 1
}>;

edit: ohhh, you mean TyCtxt::late_bound_vars? Yeah I think in this case it helped uncover the bug, because of the fact it ICEd and showed us we weren't resolving the closure default.

@jackh726
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jackh726 commented Feb 7, 2022

I guess this example shows that this did help us uncover a bug, but kind of indirectly: #93647 (comment)

This just didn't uncover a case where "lost" bound vars.

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lcnr commented Feb 18, 2022

this is now fixed on beta

@lcnr lcnr closed this as completed Feb 18, 2022
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C-bug Category: This is a bug. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-critical Critical priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Resolve lifetimes for const generic defaults compiler-errors/rust
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