ICE: 'no entry found for key' when using for<T> T: Copy in current nightly and beta

[jonabit]

This little snippet results in an ICE on current nightly and beta in the playground today. On stable there's no such error.

fn a() where for<T> T: Copy { }

Meta

rustc --version --verbose:

rustc 1.63.0-nightly (50b00252a 2022-06-06) running on x86_64-unknown-linux-gnu

Error output

thread 'rustc' panicked at 'no entry found for key', compiler/rustc_typeck/src/astconv/mod.rs:2411:29

Backtrace

   Compiling playground v0.0.1 (/playground)
error: only lifetime parameters can be used in this context
 --> src/lib.rs:1:18
  |
1 | fn a() where for<T> T: Copy { }
  |                  ^

thread 'rustc' panicked at 'no entry found for key', compiler/rustc_typeck/src/astconv/mod.rs:2411:29
stack backtrace:
   0:     0x7f9d0406109d - std::backtrace_rs::backtrace::libunwind::trace::h2a8892c156585d66
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f9d0406109d - std::backtrace_rs::backtrace::trace_unsynchronized::h918c401bc86eed40
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f9d0406109d - std::sys_common::backtrace::_print_fmt::h2a52b4cb52dc84fb
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f9d0406109d - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2f5ce3ea50e5b1d6
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f9d040bce2c - core::fmt::write::h48a5b18f44037270
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/core/src/fmt/mod.rs:1196:17
   5:     0x7f9d04052791 - std::io::Write::write_fmt::h1d1b08935a2fcf4b
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/io/mod.rs:1654:15
   6:     0x7f9d04063d75 - std::sys_common::backtrace::_print::h46d4f4f2d0dbcce0
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f9d04063d75 - std::sys_common::backtrace::print::h8334e6fa27a1dde4
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f9d04063d75 - std::panicking::default_hook::{{closure}}::hc13c7ff820b0fe22
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/panicking.rs:295:22
   9:     0x7f9d04063a96 - std::panicking::default_hook::h100ba67c99329739
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/panicking.rs:314:9
  10:     0x7f9d048396c1 - rustc_driver[30390a19e428bc19]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f9d0406444a - std::panicking::rust_panic_with_hook::h0a6a04da5fd1d45f
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/panicking.rs:702:17
  12:     0x7f9d04064287 - std::panicking::begin_panic_handler::{{closure}}::h55242fd43a581580
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/panicking.rs:588:13
  13:     0x7f9d04061554 - std::sys_common::backtrace::__rust_end_short_backtrace::h53771d999c075964
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/sys_common/backtrace.rs:138:18
  14:     0x7f9d04063fb9 - rust_begin_unwind
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/panicking.rs:584:5
  15:     0x7f9d04029293 - core::panicking::panic_fmt::h1a17f733294f4ffb
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/core/src/panicking.rs:142:14
  16:     0x7f9d040b9a91 - core::panicking::panic_display::h3127402e36de6bfc
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/core/src/panicking.rs:72:5
  17:     0x7f9d040b9a3b - core::panicking::panic_str::h4fb624d4350e816b
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/core/src/panicking.rs:56:5
  18:     0x7f9d04029106 - core::option::expect_failed::hd19284a870be6eb5
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/core/src/option.rs:1874:5
  19:     0x7f9d05daabd6 - <dyn rustc_typeck[a3bfe43d381eec93]::astconv::AstConv>::res_to_ty
  20:     0x7f9d05dba54d - <dyn rustc_typeck[a3bfe43d381eec93]::astconv::AstConv>::ast_ty_to_ty_inner
  21:     0x7f9d05dd8858 - rustc_typeck[a3bfe43d381eec93]::collect::gather_explicit_predicates_of
  22:     0x7f9d05dda2a2 - rustc_typeck[a3bfe43d381eec93]::collect::explicit_predicates_of
  23:     0x7f9d063f7bc8 - rustc_query_system[c8ac68b744dd57fa]::query::plumbing::get_query::<rustc_query_impl[51e1f4158b96ee22]::queries::explicit_predicates_of, rustc_query_impl[51e1f4158b96ee22]::plumbing::QueryCtxt>
  24:     0x7f9d062de1be - <rustc_query_impl[51e1f4158b96ee22]::Queries as rustc_middle[70296c36ca3d2602]::ty::query::QueryEngine>::explicit_predicates_of
  25:     0x7f9d05dd715a - rustc_typeck[a3bfe43d381eec93]::collect::predicates_defined_on
  26:     0x7f9d063f51be - rustc_query_system[c8ac68b744dd57fa]::query::plumbing::get_query::<rustc_query_impl[51e1f4158b96ee22]::queries::predicates_defined_on, rustc_query_impl[51e1f4158b96ee22]::plumbing::QueryCtxt>
  27:     0x7f9d062de18e - <rustc_query_impl[51e1f4158b96ee22]::Queries as rustc_middle[70296c36ca3d2602]::ty::query::QueryEngine>::predicates_defined_on
  28:     0x7f9d05dd779f - rustc_typeck[a3bfe43d381eec93]::collect::predicates_of
  29:     0x7f9d063e1493 - rustc_query_system[c8ac68b744dd57fa]::query::plumbing::get_query::<rustc_query_impl[51e1f4158b96ee22]::queries::predicates_of, rustc_query_impl[51e1f4158b96ee22]::plumbing::QueryCtxt>
  30:     0x7f9d062dd26e - <rustc_query_impl[51e1f4158b96ee22]::Queries as rustc_middle[70296c36ca3d2602]::ty::query::QueryEngine>::predicates_of
  31:     0x7f9d05dce5be - rustc_typeck[a3bfe43d381eec93]::collect::convert_item
  32:     0x7f9d05e4c31d - <rustc_middle[70296c36ca3d2602]::hir::map::Map>::deep_visit_item_likes_in_module::<rustc_typeck[a3bfe43d381eec93]::collect::CollectItemTypesVisitor>
  33:     0x7f9d06c65a3c - rustc_typeck[a3bfe43d381eec93]::collect::collect_mod_item_types
  34:     0x7f9d063b5706 - rustc_query_system[c8ac68b744dd57fa]::query::plumbing::try_execute_query::<rustc_query_impl[51e1f4158b96ee22]::plumbing::QueryCtxt, rustc_query_system[c8ac68b744dd57fa]::query::caches::DefaultCache<rustc_span[db009ef5852f774a]::def_id::LocalDefId, ()>>
  35:     0x7f9d06f8ddb3 - rustc_query_system[c8ac68b744dd57fa]::query::plumbing::get_query::<rustc_query_impl[51e1f4158b96ee22]::queries::collect_mod_item_types, rustc_query_impl[51e1f4158b96ee22]::plumbing::QueryCtxt>
  36:     0x7f9d06cae19d - <rustc_middle[70296c36ca3d2602]::hir::map::Map>::for_each_module::<rustc_typeck[a3bfe43d381eec93]::check_crate::{closure#0}::{closure#0}::{closure#0}>
  37:     0x7f9d06c88875 - <rustc_session[f622d47d49ca7e5c]::session::Session>::track_errors::<rustc_typeck[a3bfe43d381eec93]::check_crate::{closure#0}, ()>
  38:     0x7f9d06c74c80 - rustc_typeck[a3bfe43d381eec93]::check_crate
  39:     0x7f9d06a321c7 - rustc_interface[30bf44ec34e2f97]::passes::analysis
  40:     0x7f9d06f524ef - rustc_query_system[c8ac68b744dd57fa]::query::plumbing::try_execute_query::<rustc_query_impl[51e1f4158b96ee22]::plumbing::QueryCtxt, rustc_query_system[c8ac68b744dd57fa]::query::caches::DefaultCache<(), core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>>>
  41:     0x7f9d06f99dfe - rustc_query_system[c8ac68b744dd57fa]::query::plumbing::get_query::<rustc_query_impl[51e1f4158b96ee22]::queries::analysis, rustc_query_impl[51e1f4158b96ee22]::plumbing::QueryCtxt>
  42:     0x7f9d069ef547 - <rustc_interface[30bf44ec34e2f97]::passes::QueryContext>::enter::<rustc_driver[30390a19e428bc19]::run_compiler::{closure#1}::{closure#2}::{closure#3}, core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>>
  43:     0x7f9d069d970f - <rustc_interface[30bf44ec34e2f97]::interface::Compiler>::enter::<rustc_driver[30390a19e428bc19]::run_compiler::{closure#1}::{closure#2}, core[42e67a1b4ba6212c]::result::Result<core[42e67a1b4ba6212c]::option::Option<rustc_interface[30bf44ec34e2f97]::queries::Linker>, rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>>
  44:     0x7f9d06a02d5f - rustc_span[db009ef5852f774a]::with_source_map::<core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>, rustc_interface[30bf44ec34e2f97]::interface::create_compiler_and_run<core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>, rustc_driver[30390a19e428bc19]::run_compiler::{closure#1}>::{closure#1}>
  45:     0x7f9d069da5a2 - <scoped_tls[2965e6335b4e6f3e]::ScopedKey<rustc_span[db009ef5852f774a]::SessionGlobals>>::set::<rustc_interface[30bf44ec34e2f97]::interface::run_compiler<core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>, rustc_driver[30390a19e428bc19]::run_compiler::{closure#1}>::{closure#0}, core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>>
  46:     0x7f9d069efbcf - std[41be3fa6aba1786e]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[30bf44ec34e2f97]::util::run_in_thread_pool_with_globals<rustc_interface[30bf44ec34e2f97]::interface::run_compiler<core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>, rustc_driver[30390a19e428bc19]::run_compiler::{closure#1}>::{closure#0}, core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>>::{closure#0}, core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>>
  47:     0x7f9d069efd39 - <<std[41be3fa6aba1786e]::thread::Builder>::spawn_unchecked_<rustc_interface[30bf44ec34e2f97]::util::run_in_thread_pool_with_globals<rustc_interface[30bf44ec34e2f97]::interface::run_compiler<core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>, rustc_driver[30390a19e428bc19]::run_compiler::{closure#1}>::{closure#0}, core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>>::{closure#0}, core[42e67a1b4ba6212c]::result::Result<(), rustc_errors[e8101b8b045aac39]::ErrorGuaranteed>>::{closure#1} as core[42e67a1b4ba6212c]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  48:     0x7f9d0406e373 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha070fd431c3387e9
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/alloc/src/boxed.rs:1951:9
  49:     0x7f9d0406e373 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd87ab2d0201316b5
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/alloc/src/boxed.rs:1951:9
  50:     0x7f9d0406e373 - std::sys::unix::thread::Thread::new::thread_start::ha32118aaa6c8a9be
                               at /rustc/50b00252aeb77b10db04d65dc9e12ce758def4b5/library/std/src/sys/unix/thread.rs:108:17
  51:     0x7f9d03f94609 - start_thread
  52:     0x7f9d03eb7133 - clone
  53:                0x0 - <unknown>

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 1.63.0-nightly (50b00252a 2022-06-06) running on x86_64-unknown-linux-gnu

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

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

query stack during panic:
#0 [explicit_predicates_of] computing explicit predicates of `a`
#1 [predicates_defined_on] computing predicates of `a`
#2 [predicates_of] computing predicates of `a`
#3 [collect_mod_item_types] collecting item types in top-level module
#4 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `playground` due to previous error

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-low

[steffahn]

Regression in #95779, cc @cjgillot @petrochenkov