ICE when checking the size of a non-zero sized type in a generic const expression

[PatchMixolydic]

Code

Playground

#![allow(incomplete_features)]
#![feature(generic_const_exprs)]

use std::mem::size_of;

struct Predicate<const COND: bool>;
trait True {}
impl True for Predicate<true> {}

unsafe trait ZeroSized {}

unsafe impl<T> ZeroSized for T
where
    Predicate<{ size_of::<T>() == 0 }>: True,
{}

fn assert_zero_sized<T: ZeroSized>(_: T) {}

fn main() {
    assert_zero_sized(vec![1, 2, 3]);
}

Meta

rustc --version --verbose:

rustc 1.58.0-nightly (baba6687d 2021-11-03)
binary: rustc
commit-hash: baba6687df3e83fdb15cc6ec239b4a1c75a30505
commit-date: 2021-11-03
host: x86_64-unknown-linux-gnu
release: 1.58.0-nightly
LLVM version: 13.0.0

Error output

error: internal compiler error: compiler/rustc_middle/src/ty/sty.rs:2186:17: `is_trivially_sized` applied to unexpected type: ^0

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1147:9
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 1.58.0-nightly (18bc4bee9 2021-11-02) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type bin

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

query stack during panic:
#0 [layout_of] computing layout of `*const ^0`
#1 [layout_of] computing layout of `core::ptr::unique::Unique<^0>`
end of query stack

Backtrace

error: internal compiler error: compiler/rustc_middle/src/ty/sty.rs:2186:17: `is_trivially_sized` applied to unexpected type: ^0

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1147:9
stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
   1: std::panic::panic_any::<rustc_errors::ExplicitBug>
   2: <rustc_errors::HandlerInner>::bug
   3: <rustc_errors::Handler>::bug
   4: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, ()>
   5: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>
   6: rustc_middle::util::bug::bug_fmt
   7: <rustc_middle::ty::TyS>::is_sized
   8: rustc_middle::ty::layout::layout_of
   9: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::layout_of
  10: <alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>> as alloc::vec::spec_from_iter::SpecFromIter<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>, core::iter::adapters::ResultShunt<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_middle::ty::FieldDef>, <rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt>>::layout_of_uncached::{closure#5}::{closure#0}>, rustc_middle::ty::layout::LayoutError>>>::from_iter
  11: <alloc::vec::Vec<alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>>> as alloc::vec::spec_from_iter::SpecFromIter<alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>>, core::iter::adapters::ResultShunt<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_middle::ty::VariantDef>, <rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt>>::layout_of_uncached::{closure#5}>, rustc_middle::ty::layout::LayoutError>>>::from_iter
  12: rustc_middle::ty::layout::layout_of
  13: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::layout_of
  14: <alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>> as alloc::vec::spec_from_iter::SpecFromIter<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>, core::iter::adapters::ResultShunt<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_middle::ty::FieldDef>, <rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt>>::layout_of_uncached::{closure#5}::{closure#0}>, rustc_middle::ty::layout::LayoutError>>>::from_iter
  15: <alloc::vec::Vec<alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>>> as alloc::vec::spec_from_iter::SpecFromIter<alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>>, core::iter::adapters::ResultShunt<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_middle::ty::VariantDef>, <rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt>>::layout_of_uncached::{closure#5}>, rustc_middle::ty::layout::LayoutError>>>::from_iter
  16: rustc_middle::ty::layout::layout_of
  17: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::layout_of
  18: <alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>> as alloc::vec::spec_from_iter::SpecFromIter<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>, core::iter::adapters::ResultShunt<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_middle::ty::FieldDef>, <rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt>>::layout_of_uncached::{closure#5}::{closure#0}>, rustc_middle::ty::layout::LayoutError>>>::from_iter
  19: <alloc::vec::Vec<alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>>> as alloc::vec::spec_from_iter::SpecFromIter<alloc::vec::Vec<rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS>>, core::iter::adapters::ResultShunt<core::iter::adapters::map::Map<core::slice::iter::Iter<rustc_middle::ty::VariantDef>, <rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt>>::layout_of_uncached::{closure#5}>, rustc_middle::ty::layout::LayoutError>>>::from_iter
  20: rustc_middle::ty::layout::layout_of
  21: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::layout_of
  22: <rustc_const_eval::interpret::eval_context::InterpCx<rustc_const_eval::const_eval::machine::CompileTimeInterpreter> as rustc_middle::ty::layout::LayoutOf>::layout_of
  23: <rustc_const_eval::interpret::eval_context::InterpCx<rustc_const_eval::const_eval::machine::CompileTimeInterpreter>>::run
  24: rustc_const_eval::const_eval::eval_queries::eval_to_allocation_raw_provider
  25: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::eval_to_allocation_raw, rustc_query_impl::plumbing::QueryCtxt>
  26: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::eval_to_allocation_raw
  27: rustc_const_eval::const_eval::eval_queries::eval_to_const_value_raw_provider
  28: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_middle::ty::ParamEnvAnd<rustc_middle::mir::interpret::GlobalId>, core::result::Result<rustc_middle::mir::interpret::value::ConstValue, rustc_middle::mir::interpret::error::ErrorHandled>>>
  29: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::eval_to_const_value_raw
  30: <rustc_middle::ty::context::TyCtxt>::const_eval_global_id
  31: <rustc_middle::ty::context::TyCtxt>::const_eval_resolve
  32: <rustc_infer::infer::InferCtxt>::const_eval_resolve
  33: <rustc_trait_selection::traits::fulfill::FulfillProcessor>::progress_changed_obligations::{closure#0}
  34: <rustc_trait_selection::traits::fulfill::FulfillProcessor>::progress_changed_obligations
  35: <rustc_data_structures::obligation_forest::ObligationForest<rustc_trait_selection::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection::traits::fulfill::FulfillProcessor, rustc_data_structures::obligation_forest::Outcome<rustc_trait_selection::traits::fulfill::PendingPredicateObligation, rustc_infer::traits::FulfillmentErrorCode>>
  36: <rustc_trait_selection::traits::fulfill::FulfillmentContext as rustc_infer::traits::engine::TraitEngine>::select_with_constness_where_possible
  37: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
  38: <rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
  39: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
  40: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  41: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  42: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_stmt
  43: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
  44: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  45: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_return_expr
  46: rustc_typeck::check::check::check_fn
  47: <rustc_infer::infer::InferCtxtBuilder>::enter::<&rustc_middle::ty::context::TypeckResults, <rustc_typeck::check::inherited::InheritedBuilder>::enter<rustc_typeck::check::typeck_with_fallback<rustc_typeck::check::typeck::{closure#0}>::{closure#1}, &rustc_middle::ty::context::TypeckResults>::{closure#0}>
  48: rustc_typeck::check::typeck
  49: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalDefId, &rustc_middle::ty::context::TypeckResults>>
  50: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
  51: <rustc_middle::hir::map::Map>::par_body_owners::<rustc_typeck::check::typeck_item_bodies::{closure#0}>
  52: rustc_typeck::check::typeck_item_bodies
  53: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), ()>>
  54: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::typeck_item_bodies, rustc_query_impl::plumbing::QueryCtxt>
  55: <rustc_session::session::Session>::time::<(), rustc_typeck::check_crate::{closure#7}>
  56: rustc_typeck::check_crate
  57: rustc_interface::passes::analysis
  58: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorReported>>>
  59: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  60: <rustc_interface::passes::QueryContext>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorReported>>
  61: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
  62: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}>
  63: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
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 1.58.0-nightly (18bc4bee9 2021-11-02) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type bin

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

query stack during panic:
#0 [layout_of] computing layout of `*const ^0`
#1 [layout_of] computing layout of `core::ptr::unique::Unique<^0>`
#2 [layout_of] computing layout of `alloc::raw_vec::RawVec<^0>`
#3 [layout_of] computing layout of `alloc::vec::Vec<^0>`
#4 [eval_to_allocation_raw] const-evaluating + checking `<impl at src/main.rs:12:1: 15:3>::{constant#0}`
#5 [eval_to_const_value_raw] simplifying constant for the type system `<impl at src/main.rs:12:1: 15:3>::{constant#0}`
#6 [typeck] type-checking `main`
#7 [typeck_item_bodies] type-checking all item bodies
#8 [analysis] running analysis passes on this crate
end of query stack

[PatchMixolydic]

Duplicate of #88468