ICE (should be handled by `coerce`) trying to convert `dyn Trait` into `dyn* Trait`

[theemathas]

Code

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

trait Foo {}

pub fn lol(x: &dyn Foo) {
    *x as dyn* Foo;
}

Meta

Reproducible on the playground with version 1.85.0-nightly (2024-12-19 9e136a30a965bf4e63f0)

Error output

Backtrace

error: internal compiler error: compiler/rustc_hir_typeck/src/cast.rs:725:17: should be handled by `coerce`
 --> src/lib.rs:7:5
  |
7 |     *x as dyn* Foo;
  |     ^^^^^^^^^^^^^^

thread 'rustc' panicked at compiler/rustc_hir_typeck/src/cast.rs:725:17:
Box<dyn Any>
stack backtrace:
   0:     0x7ace13b8315a - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h6c37de0361fa7462
   1:     0x7ace14213cbc - core::fmt::write::hf77fe0583268bf67
   2:     0x7ace15142dd1 - std::io::Write::write_fmt::h3b0b8069e2435ed6
   3:     0x7ace13b82fb2 - std::sys::backtrace::BacktraceLock::print::hce84519ec0e7588e
   4:     0x7ace13b854aa - std::panicking::default_hook::{{closure}}::h6e0433c33d1ed12b
   5:     0x7ace13b852f3 - std::panicking::default_hook::h19d4e9e8d7fba9e2
   6:     0x7ace12cf7768 - std[19739dcbdd52d894]::panicking::update_hook::<alloc[d24e20bba6540ab9]::boxed::Box<rustc_driver_impl[3177e72804664110]::install_ice_hook::{closure#0}>>::{closure#0}
   7:     0x7ace13b85c68 - std::panicking::rust_panic_with_hook::hd21771b96ea64164
   8:     0x7ace12d322d1 - std[19739dcbdd52d894]::panicking::begin_panic::<rustc_errors[37abd7aad4ad5df0]::ExplicitBug>::{closure#0}
   9:     0x7ace12d274b6 - std[19739dcbdd52d894]::sys::backtrace::__rust_end_short_backtrace::<std[19739dcbdd52d894]::panicking::begin_panic<rustc_errors[37abd7aad4ad5df0]::ExplicitBug>::{closure#0}, !>
  10:     0x7ace12d23ec9 - std[19739dcbdd52d894]::panicking::begin_panic::<rustc_errors[37abd7aad4ad5df0]::ExplicitBug>
  11:     0x7ace12d3c231 - <rustc_errors[37abd7aad4ad5df0]::diagnostic::BugAbort as rustc_errors[37abd7aad4ad5df0]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7ace1328b76c - <rustc_errors[37abd7aad4ad5df0]::DiagCtxtHandle>::span_bug::<rustc_span[2a960e124d280c12]::span_encoding::Span, alloc[d24e20bba6540ab9]::string::String>
  13:     0x7ace13310fe7 - rustc_middle[a45f2c6e02975f4b]::util::bug::opt_span_bug_fmt::<rustc_span[2a960e124d280c12]::span_encoding::Span>::{closure#0}
  14:     0x7ace132f67ba - rustc_middle[a45f2c6e02975f4b]::ty::context::tls::with_opt::<rustc_middle[a45f2c6e02975f4b]::util::bug::opt_span_bug_fmt<rustc_span[2a960e124d280c12]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  15:     0x7ace132f664b - rustc_middle[a45f2c6e02975f4b]::ty::context::tls::with_context_opt::<rustc_middle[a45f2c6e02975f4b]::ty::context::tls::with_opt<rustc_middle[a45f2c6e02975f4b]::util::bug::opt_span_bug_fmt<rustc_span[2a960e124d280c12]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  16:     0x7ace1172b477 - rustc_middle[a45f2c6e02975f4b]::util::bug::span_bug_fmt::<rustc_span[2a960e124d280c12]::span_encoding::Span>
  17:     0x7ace151b0e5c - <rustc_hir_typeck[773c2b5054f1554]::cast::CastCheck>::do_check
  18:     0x7ace14439a98 - <rustc_hir_typeck[773c2b5054f1554]::fn_ctxt::FnCtxt>::check_casts
  19:     0x7ace1443bad5 - rustc_hir_typeck[773c2b5054f1554]::typeck
  20:     0x7ace1443a67b - rustc_query_impl[7b0f6e1e4ae2319d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[7b0f6e1e4ae2319d]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a45f2c6e02975f4b]::query::erase::Erased<[u8; 8usize]>>
  21:     0x7ace14494b91 - rustc_query_system[1e197417f2882beb]::query::plumbing::try_execute_query::<rustc_query_impl[7b0f6e1e4ae2319d]::DynamicConfig<rustc_data_structures[192c71b2dc5f58e0]::vec_cache::VecCache<rustc_span[2a960e124d280c12]::def_id::LocalDefId, rustc_middle[a45f2c6e02975f4b]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[1e197417f2882beb]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[7b0f6e1e4ae2319d]::plumbing::QueryCtxt, false>
  22:     0x7ace14493e4d - rustc_query_impl[7b0f6e1e4ae2319d]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  23:     0x7ace14493aff - <rustc_middle[a45f2c6e02975f4b]::hir::map::Map>::par_body_owners::<rustc_hir_analysis[f04f71a4747ef8cb]::check_crate::{closure#4}>::{closure#0}
  24:     0x7ace14491b12 - rustc_hir_analysis[f04f71a4747ef8cb]::check_crate
  25:     0x7ace1465a07c - rustc_interface[dfcc7ff3f03a05db]::passes::run_required_analyses
  26:     0x7ace15146c5e - rustc_interface[dfcc7ff3f03a05db]::passes::analysis
  27:     0x7ace15146c2f - rustc_query_impl[7b0f6e1e4ae2319d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[7b0f6e1e4ae2319d]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a45f2c6e02975f4b]::query::erase::Erased<[u8; 0usize]>>
  28:     0x7ace151a9c55 - rustc_query_system[1e197417f2882beb]::query::plumbing::try_execute_query::<rustc_query_impl[7b0f6e1e4ae2319d]::DynamicConfig<rustc_query_system[1e197417f2882beb]::query::caches::SingleCache<rustc_middle[a45f2c6e02975f4b]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[7b0f6e1e4ae2319d]::plumbing::QueryCtxt, false>
  29:     0x7ace151a998e - rustc_query_impl[7b0f6e1e4ae2319d]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7ace1519ed9e - rustc_interface[dfcc7ff3f03a05db]::passes::create_and_enter_global_ctxt::<core[57d68807791337c0]::option::Option<rustc_interface[dfcc7ff3f03a05db]::queries::Linker>, rustc_driver_impl[3177e72804664110]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  31:     0x7ace15210c43 - rustc_interface[dfcc7ff3f03a05db]::interface::run_compiler::<(), rustc_driver_impl[3177e72804664110]::run_compiler::{closure#0}>::{closure#1}
  32:     0x7ace151f7711 - std[19739dcbdd52d894]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[dfcc7ff3f03a05db]::util::run_in_thread_with_globals<rustc_interface[dfcc7ff3f03a05db]::util::run_in_thread_pool_with_globals<rustc_interface[dfcc7ff3f03a05db]::interface::run_compiler<(), rustc_driver_impl[3177e72804664110]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  33:     0x7ace151f7ba6 - <<std[19739dcbdd52d894]::thread::Builder>::spawn_unchecked_<rustc_interface[dfcc7ff3f03a05db]::util::run_in_thread_with_globals<rustc_interface[dfcc7ff3f03a05db]::util::run_in_thread_pool_with_globals<rustc_interface[dfcc7ff3f03a05db]::interface::run_compiler<(), rustc_driver_impl[3177e72804664110]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[57d68807791337c0]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7ace151f916f - std::sys::pal::unix::thread::Thread::new::thread_start::h71fe57097907b3f8
  35:     0x7ace16839a94 - <unknown>
  36:     0x7ace168c6a34 - clone
  37:                0x0 - <unknown>

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: please make sure that you have updated to the latest nightly

note: please attach the file at `/playground/rustc-ice-2024-12-20T04_31_48-28.txt` to your bug report

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 [typeck] type-checking `lol`
#1 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `playground` (lib)

Seems related to #134543 and #132127.

@rustbot labels +F-dyn_star +requires-nightly

[matthiaskrgr]

duplicate of #132127 I think