Compiler panic when yielding array element from non-generator

[arxanas]

Steps to reproduce:

1. Run cargo new --lib crash.
2. Replace src/lib.rs with this content:

#![feature(generators)]

pub fn crash(arr: [usize; 1]) {
    yield arr[0];
}

3. Run RUST_BACKTRACE=full cargo +nightly build --verbose to get this output:

   Compiling crash v0.1.0 (/Users/waleedk/Workspace/rust/crash)
     Running `rustc --edition=2018 --crate-name crash src/lib.rs --color never --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 -C metadata=23cf916e5f69a1d5 -C extra-filename=-23cf916e5f69a1d5 --out-dir /Users/waleedk/Workspace/rust/crash/target/debug/deps -C incremental=/Users/waleedk/Workspace/rust/crash/target/debug/incremental -L dependency=/Users/waleedk/Workspace/rust/crash/target/debug/deps`
error[E0627]: yield statement outside of generator literal
 --> src/lib.rs:4:5
  |
4 |     yield arr[0];
  |     ^^^^^^^^^^^^

error: internal compiler error: src/librustc/ty/context.rs:513: node_type: no type for node `expr arr (hir_id=HirId { owner: DefIndex(12), local_id: 4 })`

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:643:9
stack backtrace:
   0:        0x106073185 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h407a883469cc9aea
   1:        0x1060a9e40 - core::fmt::write::h0fac5bdf1ffbd343
   2:        0x1060667db - std::io::Write::write_fmt::h29f6e9a4453f8e64
   3:        0x1060774ca - std::panicking::default_hook::{{closure}}::h514976ca44017853
   4:        0x1060771d5 - std::panicking::default_hook::h0cf5e5649c498611
   5:        0x106e23a72 - rustc_driver::report_ice::h6ba72ba240c53ce3
   6:        0x106077d02 - std::panicking::rust_panic_with_hook::hb89fa56b0e453398
   7:        0x10894e321 - std::panicking::begin_panic::hce94a994785bd80a
   8:        0x108962a11 - rustc_errors::Handler::bug::h265e236e59364186
   9:        0x10827b7eb - rustc::util::bug::opt_span_bug_fmt::{{closure}}::h1866a473633f70cb
  10:        0x108275f86 - rustc::ty::context::tls::with_opt::{{closure}}::h8e08a01f090121d8
  11:        0x108275c84 - rustc::ty::context::tls::with_context_opt::hdad39dbafc5ec58d
  12:        0x108275cb2 - rustc::ty::context::tls::with_opt::h32448c650a990704
  13:        0x10827b708 - rustc::util::bug::opt_span_bug_fmt::h7d1e0412534498f1
  14:        0x10827b65b - rustc::util::bug::bug_fmt::h15b5afa17bb8a885
  15:        0x10846a6af - rustc::ty::context::TypeckTables::node_type::{{closure}}::h5cee46e2a7fddad1
  16:        0x10846af7f - rustc::ty::context::TypeckTables::expr_ty_adjusted::h9a1a0498668f933a
  17:        0x107349b61 - <rustc_typeck::check::writeback::WritebackCx as rustc::hir::intravisit::Visitor>::visit_expr::hfabfed1d580fd434
  18:        0x107349d37 - <rustc_typeck::check::writeback::WritebackCx as rustc::hir::intravisit::Visitor>::visit_expr::hfabfed1d580fd434
  19:        0x10749985f - rustc::hir::intravisit::walk_expr::hce3981a7cb93dce2
  20:        0x107349d37 - <rustc_typeck::check::writeback::WritebackCx as rustc::hir::intravisit::Visitor>::visit_expr::hfabfed1d580fd434
  21:        0x1072ef7d7 - rustc_typeck::check::writeback::<impl rustc_typeck::check::FnCtxt>::resolve_type_vars_in_body::hc3f47a3d49d6def3
  22:        0x1074787a2 - rustc::ty::context::GlobalCtxt::enter_local::h699d9d6b520150c4
  23:        0x10731d5ac - rustc_typeck::check::typeck_tables_of::h0349fdf1b9f7c1ea
  24:        0x10736878a - rustc::ty::query::__query_compute::typeck_tables_of::he96adad9f8508347
  25:        0x1073f245b - rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::typeck_tables_of>::compute::hc066a0e8be7ccc2d
  26:        0x10739e9e9 - rustc::dep_graph::graph::DepGraph::with_task_impl::hbd4ef70d845d9338
  27:        0x107415aa0 - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::h2ce71490153de00b
  28:        0x1073ef260 - rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners::hc4ce32a0430f92a7
  29:        0x10731d0a5 - rustc_typeck::check::typeck_item_bodies::h2b11ae34f5facd7b
  30:        0x107368b92 - rustc::ty::query::__query_compute::typeck_item_bodies::h18343492cac5f4ec
  31:        0x10739689b - rustc::dep_graph::graph::DepGraph::with_task_impl::h550c64cb66ef5c2a
  32:        0x107470ca8 - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::hffc3b386c637fd84
  33:        0x10736bd65 - rustc::util::common::time::h7c6cc64b93fbb8e0
  34:        0x1075166dc - rustc_typeck::check_crate::h1976021c3c35cace
  35:        0x106ebc862 - rustc_interface::passes::analysis::h58e38d87b942506f
  36:        0x106dd024e - rustc::ty::query::__query_compute::analysis::hddfd24a5907dd9e0
  37:        0x106dd12d9 - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::h190aae50181d7543
  38:        0x106df116c - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::h5a27bf8f9540381c
  39:        0x106f2ec9b - rustc_interface::passes::create_global_ctxt::{{closure}}::h9c5444345f4c2293
  40:        0x106df3622 - rustc_interface::interface::run_compiler_in_existing_thread_pool::hfc3311be21f2f27a
  41:        0x106e255e4 - std::thread::local::LocalKey<T>::with::h188788fcd090e799
  42:        0x106e2a0e2 - scoped_tls::ScopedKey<T>::set::h999b3fc3ad485797
  43:        0x106e43235 - syntax::with_globals::h3db29ff7d66827a3
  44:        0x106dcb1fd - std::sys_common::backtrace::__rust_begin_short_backtrace::h1f76ce0ab4ce564e
  45:        0x106086faf - __rust_maybe_catch_panic
  46:        0x106de7407 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h45a83671da86e5b7
  47:        0x10605902e - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h9c2e02a877751d79
  48:        0x106085dbe - std::sys::unix::thread::Thread::new::thread_start::h48a214a3a7467592
  49:     0x7fff5d2ee2eb - _pthread_body
  50:     0x7fff5d2f1249 - _pthread_start

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.39.0-nightly (eceec57f7 2019-09-18) running on x86_64-apple-darwin

note: compiler flags: -C debuginfo=2 -C incremental --crate-type lib

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

query stack during panic:
#0 [typeck_tables_of] processing `crash`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 2 previous errors

error: Could not compile `crash`.

Caused by:
  process didn't exit successfully: `rustc --edition=2018 --crate-name crash src/lib.rs --color never --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 -C metadata=23cf916e5f69a1d5 -C extra-filename=-23cf916e5f69a1d5 --out-dir /Users/waleedk/Workspace/rust/crash/target/debug/deps -C incremental=/Users/waleedk/Workspace/rust/crash/target/debug/incremental -L dependency=/Users/waleedk/Workspace/rust/crash/target/debug/deps` (exit code: 101)

[jonas-schievink]

No longer ICEs