ICE: compiler/rustc_privacy/src/lib.rs:282:17: unexpected type: FreshTy(0)

[matthiaskrgr]

./src/test/ui/traits/alias/self-in-generics.rs

Code

#![feature(trait_alias)]

pub trait SelfInput = Fn(&mut Self);

pub fn f(_f: &dyn SelfInput) {}
//~^ ERROR the trait alias `SelfInput` cannot be made into an object [E0038]

fn main() {}

Meta

rustc --version --verbose:

rustdoc 1.65.0-nightly (e8dc8bca2 2022-08-13)
binary: rustdoc
commit-hash: e8dc8bca2118ec1ed5970790614f0b81e9167f10
commit-date: 2022-08-13
host: x86_64-unknown-linux-gnu
release: 1.65.0-nightly
LLVM version: 15.0.0

Error output

<output>

Backtrace

error[E0038]: the trait alias `SelfInput` cannot be made into an object
 --> self-in-generics.rs:5:19
  |
5 | pub fn f(_f: &dyn SelfInput) {}
  |                   ^^^^^^^^^
  |
  = note: it cannot use `Self` as a type parameter in a supertrait or `where`-clause

error: internal compiler error: compiler/rustc_privacy/src/lib.rs:282:17: unexpected type: FreshTy(0)

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/compiler/rustc_errors/src/lib.rs:1391:9
stack backtrace:
   0:     0x7fb08c6fd220 - std::backtrace_rs::backtrace::libunwind::trace::hdfd7439c4ac437b8
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   1:     0x7fb08c6fd220 - std::backtrace_rs::backtrace::trace_unsynchronized::h6c473f268a0da94d
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fb08c6fd220 - std::sys_common::backtrace::_print_fmt::h6b48bf233902d36b
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7fb08c6fd220 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9b66d5b5ab6d8b74
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7fb08c7582ee - core::fmt::write::h8d6bde4a67b5a644
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/core/src/fmt/mod.rs:1202:17
   5:     0x7fb08c6edf35 - std::io::Write::write_fmt::ha5ed2fe9bc688052
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/io/mod.rs:1672:15
   6:     0x7fb08c6ffee3 - std::sys_common::backtrace::_print::hcc6babf718d978b5
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7fb08c6ffee3 - std::sys_common::backtrace::print::h66a498b3cfc1608c
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7fb08c6ffee3 - std::panicking::default_hook::{{closure}}::h78975c9fdf2e25ac
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/panicking.rs:295:22
   9:     0x7fb08c6ffbcf - std::panicking::default_hook::h3938825ac353f447
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/panicking.rs:314:9
  10:     0x7fb08ef3c424 - <rustc_driver[a5410d64bf022668]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[9ef3251603221d4a]::ops::function::FnOnce<(&core[9ef3251603221d4a]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7fb08c70071d - std::panicking::rust_panic_with_hook::h47eb8ecd1bd91d17
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/panicking.rs:702:17
  12:     0x7fb08fee0151 - std[2e6ea336b53db173]::panicking::begin_panic::<rustc_errors[f4cb041045aad9b5]::ExplicitBug>::{closure#0}
  13:     0x7fb08fedf956 - std[2e6ea336b53db173]::sys_common::backtrace::__rust_end_short_backtrace::<std[2e6ea336b53db173]::panicking::begin_panic<rustc_errors[f4cb041045aad9b5]::ExplicitBug>::{closure#0}, !>
  14:     0x7fb08fec0616 - std[2e6ea336b53db173]::panicking::begin_panic::<rustc_errors[f4cb041045aad9b5]::ExplicitBug>
  15:     0x7fb08ff04f36 - std[2e6ea336b53db173]::panic::panic_any::<rustc_errors[f4cb041045aad9b5]::ExplicitBug>
  16:     0x7fb08ff04d8d - <rustc_errors[f4cb041045aad9b5]::HandlerInner>::bug::<&alloc[a4b47a688312783c]::string::String>
  17:     0x7fb08ff04ae0 - <rustc_errors[f4cb041045aad9b5]::Handler>::bug::<&alloc[a4b47a688312783c]::string::String>
  18:     0x7fb08ff2d1ad - rustc_middle[9190505212f11309]::ty::context::tls::with_context_opt::<rustc_middle[9190505212f11309]::ty::context::tls::with_opt<rustc_middle[9190505212f11309]::util::bug::opt_span_bug_fmt<rustc_span[812c5506f6a7d0a0]::span_encoding::Span>::{closure#0}, ()>::{closure#0}, ()>
  19:     0x7fb08ff2f016 - rustc_middle[9190505212f11309]::util::bug::opt_span_bug_fmt::<rustc_span[812c5506f6a7d0a0]::span_encoding::Span>
  20:     0x7fb08d8dbe03 - rustc_middle[9190505212f11309]::util::bug::bug_fmt
  21:     0x7fb08d9524fc - <rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitor>::visit_ty
  22:     0x7fb08d951608 - <rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitor>::visit_ty
  23:     0x7fb08d952c35 - <rustc_middle[9190505212f11309]::ty::sty::Binder<rustc_middle[9190505212f11309]::ty::sty::FnSig> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitable>::visit_with::<rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor>>
  24:     0x7fb08d951795 - <rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitor>::visit_ty
  25:     0x7fb08e2d1c03 - <rustc_middle[9190505212f11309]::ty::sty::Binder<rustc_middle[9190505212f11309]::ty::sty::ExistentialPredicate> as rustc_middle[9190505212f11309]::ty::visit::TypeSuperVisitable>::super_visit_with::<rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor>>
  26:     0x7fb08d954647 - <&rustc_middle[9190505212f11309]::ty::list::List<rustc_middle[9190505212f11309]::ty::sty::Binder<rustc_middle[9190505212f11309]::ty::sty::ExistentialPredicate>> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitable>::visit_with::<rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor>>
  27:     0x7fb08d951c6f - <rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitor>::visit_ty
  28:     0x7fb08d951608 - <rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitor>::visit_ty
  29:     0x7fb08d952c35 - <rustc_middle[9190505212f11309]::ty::sty::Binder<rustc_middle[9190505212f11309]::ty::sty::FnSig> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitable>::visit_with::<rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor>>
  30:     0x7fb08d951759 - <rustc_privacy[1d0d09284a100788]::DefIdVisitorSkeleton<rustc_privacy[1d0d09284a100788]::ReachEverythingInTheInterfaceVisitor> as rustc_middle[9190505212f11309]::ty::visit::TypeVisitor>::visit_ty
  31:     0x7fb08dc6c423 - <rustc_privacy[1d0d09284a100788]::EmbargoVisitor as rustc_hir[9122b05cfb5f69c7]::intravisit::Visitor>::visit_item
  32:     0x7fb08ec096d9 - rustc_privacy[1d0d09284a100788]::privacy_access_levels
  33:     0x7fb08ecd4ab3 - rustc_query_system[88e27f7cc16d83bb]::query::plumbing::try_execute_query::<rustc_query_impl[b52b8bfa962b42d5]::plumbing::QueryCtxt, rustc_query_system[88e27f7cc16d83bb]::query::caches::DefaultCache<(), &rustc_middle[9190505212f11309]::middle::privacy::AccessLevels>>
  34:     0x7fb08ecd482f - rustc_query_system[88e27f7cc16d83bb]::query::plumbing::get_query::<rustc_query_impl[b52b8bfa962b42d5]::queries::privacy_access_levels, rustc_query_impl[b52b8bfa962b42d5]::plumbing::QueryCtxt>
  35:     0x55d3fcfef119 - rustc_lint[f2fb10bf9f2518ad]::late::late_lint_crate::<rustc_lint[f2fb10bf9f2518ad]::builtin::MissingDoc>
  36:     0x55d3fd0737c8 - <rustc_session[79e06e95d9fac684]::session::Session>::time::<(), rustc_lint[f2fb10bf9f2518ad]::late::check_crate<rustc_lint[f2fb10bf9f2518ad]::builtin::MissingDoc, <rustc_lint[f2fb10bf9f2518ad]::builtin::MissingDoc>::new>::{closure#0}::{closure#0}>
  37:     0x55d3fd073e70 - <rustc_session[79e06e95d9fac684]::session::Session>::time::<(), rustdoc[5111a8b3ee4cfbad]::core::run_global_ctxt::{closure#1}>
  38:     0x55d3fcd9f38b - rustdoc[5111a8b3ee4cfbad]::core::run_global_ctxt
  39:     0x55d3fd07354f - <rustc_session[79e06e95d9fac684]::session::Session>::time::<(rustdoc[5111a8b3ee4cfbad]::clean::types::Crate, rustdoc[5111a8b3ee4cfbad]::config::RenderOptions, rustdoc[5111a8b3ee4cfbad]::formats::cache::Cache), rustdoc[5111a8b3ee4cfbad]::main_options::{closure#0}::{closure#0}::{closure#1}::{closure#0}>
  40:     0x55d3fcfa2a84 - <rustc_interface[6f1edf494a475c31]::passes::QueryContext>::enter::<rustdoc[5111a8b3ee4cfbad]::main_options::{closure#0}::{closure#0}::{closure#1}, core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>>
  41:     0x55d3fce8f959 - <rustc_interface[6f1edf494a475c31]::interface::Compiler>::enter::<rustdoc[5111a8b3ee4cfbad]::main_options::{closure#0}::{closure#0}, core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>>
  42:     0x55d3fd0cddc1 - rustc_span[812c5506f6a7d0a0]::with_source_map::<core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>, rustc_interface[6f1edf494a475c31]::interface::create_compiler_and_run<core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>, rustdoc[5111a8b3ee4cfbad]::main_options::{closure#0}>::{closure#1}>
  43:     0x55d3fce9183c - rustc_interface[6f1edf494a475c31]::interface::create_compiler_and_run::<core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>, rustdoc[5111a8b3ee4cfbad]::main_options::{closure#0}>
  44:     0x55d3fcdb0a30 - rustdoc[5111a8b3ee4cfbad]::main_options
  45:     0x55d3fcfa089c - <scoped_tls[beaf390a5842bbf2]::ScopedKey<rustc_span[812c5506f6a7d0a0]::SessionGlobals>>::set::<rustdoc[5111a8b3ee4cfbad]::main_args::{closure#0}, core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>>
  46:     0x55d3fd037610 - std[2e6ea336b53db173]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[6f1edf494a475c31]::util::run_in_thread_pool_with_globals<rustdoc[5111a8b3ee4cfbad]::main_args::{closure#0}, core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>>::{closure#0}, core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>>
  47:     0x55d3fcec7998 - <<std[2e6ea336b53db173]::thread::Builder>::spawn_unchecked_<rustc_interface[6f1edf494a475c31]::util::run_in_thread_pool_with_globals<rustdoc[5111a8b3ee4cfbad]::main_args::{closure#0}, core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>>::{closure#0}, core[9ef3251603221d4a]::result::Result<(), rustc_errors[f4cb041045aad9b5]::ErrorGuaranteed>>::{closure#1} as core[9ef3251603221d4a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  48:     0x7fb08c70a513 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha625c10cb002aafd
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/alloc/src/boxed.rs:1935:9
  49:     0x7fb08c70a513 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he99a54320e05f7cf
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/alloc/src/boxed.rs:1935:9
  50:     0x7fb08c70a513 - std::sys::unix::thread::Thread::new::thread_start::he2b2cf9ce0aef6b5
                               at /rustc/e8dc8bca2118ec1ed5970790614f0b81e9167f10/library/std/src/sys/unix/thread.rs:108:17
  51:     0x7fb08c44a78d - <unknown>
  52:     0x7fb08c4cb8e4 - clone
  53:                0x0 - <unknown>

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 1.65.0-nightly (e8dc8bca2 2022-08-13) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [privacy_access_levels] privacy access levels
end of query stack
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0038`.

See also #100484