ICE: type_alias_impl_trait + impl_trait_in_bindings 'called `Option::unwrap()` on a `None` value'

[DutchGhost]

Code

#![feature(type_alias_impl_trait)]
#![feature(impl_trait_in_bindings)]

type F = impl core::future::Future<Output = u8>;

struct Bug {
    V1: [(); {
        fn concrete_use() -> F {
            async {}
        }
        let f: F = async { 1 };
        1
    }],
}

fn main() {
}

Meta

rustc --version --verbose:

rustc 1.49.0-nightly (338f939a8 2020-11-02)

Error output

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/ty/mod.rs:2976:62

Backtrace

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/ty/mod.rs:2976:62
stack backtrace:
   0: rust_begin_unwind
             at /rustc/338f939a8d77061896cd0a1ca87a2c6d1f4ec359/library/std/src/panicking.rs:495:5
   1: core::panicking::panic_fmt
             at /rustc/338f939a8d77061896cd0a1ca87a2c6d1f4ec359/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/338f939a8d77061896cd0a1ca87a2c6d1f4ec359/library/core/src/panicking.rs:50:5
   3: rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt>::layout_raw_uncached
   4: rustc_middle::ty::layout::layout_raw
   5: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::layout_raw>::compute
   6: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
   7: rustc_data_structures::stack::ensure_sufficient_stack
   8: rustc_query_system::query::plumbing::get_query_impl
   9: <rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt> as rustc_target::abi::LayoutOf>::layout_of
  10: <alloc::vec::Vec<T> as alloc::vec::SpecFromIter<T,I>>::from_iter
  11: <core::iter::adapters::ResultShunt<I,E> as core::iter::traits::iterator::Iterator>::next
  12: <alloc::vec::Vec<T> as alloc::vec::SpecFromIter<T,I>>::from_iter
  13: rustc_middle::ty::layout::LayoutCx<rustc_middle::ty::context::TyCtxt>::layout_raw_uncached
  14: rustc_middle::ty::layout::layout_raw
  15: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::layout_raw>::compute
  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_middle::ty::layout::LayoutCx<rustc_middle::ty::query::TyCtxtAt> as rustc_target::abi::LayoutOf>::layout_of
  20: rustc_mir::interpret::eval_context::InterpCx<M>::layout_of_local
  21: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_place
  22: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::run
  23: rustc_mir::const_eval::eval_queries::eval_to_allocation_raw_provider
  24: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_allocation_raw>::compute
  25: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  26: rustc_data_structures::stack::ensure_sufficient_stack
  27: rustc_query_system::query::plumbing::get_query_impl
  28: rustc_mir::const_eval::eval_queries::eval_to_const_value_raw_provider
  29: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_const_value_raw>::compute
  30: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  31: rustc_data_structures::stack::ensure_sufficient_stack
  32: rustc_query_system::query::plumbing::get_query_impl
  33: rustc_mir::const_eval::eval_queries::eval_to_const_value_raw_provider
  34: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_const_value_raw>::compute
  35: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  36: rustc_data_structures::stack::ensure_sufficient_stack
  37: rustc_query_system::query::plumbing::get_query_impl
  38: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id
  39: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_resolve
  40: rustc_middle::ty::consts::Const::eval
  41: rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::TyS>::super_fold_with
  42: <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_ty
  43: rustc_data_structures::stack::ensure_sufficient_stack
  44: rustc_trait_selection::traits::project::normalize
  45: <rustc_infer::infer::InferCtxt as rustc_trait_selection::infer::InferCtxtExt>::partially_normalize_associated_types_in
  46: rustc_typeck::check::inherited::Inherited::normalize_associated_types_in
  47: <core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
  48: rustc_infer::infer::InferCtxtBuilder::enter
  49: rustc_typeck::check::wfcheck::check_item_well_formed
  50: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::check_item_well_formed>::compute
  51: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  52: rustc_data_structures::stack::ensure_sufficient_stack
  53: rustc_query_system::query::plumbing::get_query_impl
  54: rustc_query_system::query::plumbing::ensure_query_impl
  55: rustc_data_structures::sync::par_for_each_in
  56: rustc_hir::hir::Crate::par_visit_all_item_likes
  57: rustc_session::session::Session::track_errors
  58: rustc_typeck::check_crate
  59: rustc_interface::passes::analysis
  60: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
  61: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  62: rustc_data_structures::stack::ensure_sufficient_stack
  63: rustc_query_system::query::plumbing::get_query_impl
  64: rustc_interface::passes::QueryContext::enter
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 1.49.0-nightly (338f939a8 2020-11-02) 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_raw] computing layout of `[static generator@src/main.rs:9:19: 9:21]`
#1 [layout_raw] computing layout of `std::future::from_generator::GenFuture<[static generator@src/main.rs:9:19: 9:21]>`
#2 [eval_to_allocation_raw] const-evaluating + checking `Bug::V1::{constant#0}`
#3 [eval_to_const_value_raw] simplifying constant for the type system `Bug::V1::{constant#0}`
#4 [eval_to_const_value_raw] simplifying constant for the type system `Bug::V1::{constant#0}`
#5 [check_item_well_formed] checking that `Bug` is well-formed
#6 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors; 1 warning emitted

Some errors have detailed explanations: E0271, E0493.
For more information about an error, try `rustc --explain E0271`.
error: could not compile `playground`

[Alexendoo]

No longer ICEs since #78809