ICE: downgrade_to_delayed_bug: cannot downgrade Warning(None) to DelayedBug: not an error

[thomasyonug]

I tried this code:

  ```
fn much_larger_type(default: Default) -> MuchLargerType<Default> {
    // implementation elided
}

fn box_new<T>(t: T) -> Box<T> {
    // implementation elided
}

fn tuple_with_one_element<T>(t: T) -> (Box<T>, usize) {
    // implementation elided
}

fn closure_that_prints_stuff<T>(t: T) -> () {
    let p = t.0.0;
    println!("{} {:?}", t.1, p);
}

fn main() {}
```

I expected to see this happen: compilation success

Instead, this happened: ICE

Meta

rustc --version --verbose:

rustc 1.77.0-nightly (595bc6f00 2024-01-05)
binary: rustc
commit-hash: 595bc6f00369475047538fdae1ff8cea692ac385
commit-date: 2024-01-05
host: x86_64-unknown-linux-gnu
release: 1.77.0-nightly
LLVM version: 17.0.6

Backtrace

thread 'rustc' panicked at compiler/rustc_hir_analysis/src/astconv/lint.rs:152:22:
downgrade_to_delayed_bug: cannot downgrade Warning(None) to DelayedBug: not an error
stack backtrace:
   0:     0x7f804f3db806 - std::backtrace_rs::backtrace::libunwind::trace::hccd39fe91d56daec
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f804f3db806 - std::backtrace_rs::backtrace::trace_unsynchronized::hb9c211c184511b77
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f804f3db806 - std::sys_common::backtrace::_print_fmt::ha68911449431f29f
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f804f3db806 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h34c6aa4d9ef2549f
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f804f42df00 - core::fmt::rt::Argument::fmt::h97f0cd02ba3737ef
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/core/src/fmt/rt.rs:142:9
   5:     0x7f804f42df00 - core::fmt::write::heb4624e14e98aea7
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f804f3cf15f - std::io::Write::write_fmt::h25504a918ea5c052
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/io/mod.rs:1810:15
   7:     0x7f804f3db5e4 - std::sys_common::backtrace::_print::h16efe88e7fa25a23
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f804f3db5e4 - std::sys_common::backtrace::print::h4f2dda7c938219d4
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f804f3de377 - std::panicking::default_hook::{{closure}}::hdfd96bdc522bbb15
  10:     0x7f804f3de0d9 - std::panicking::default_hook::hf1cac0ca04453e02
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/panicking.rs:292:9
  11:     0x7f80521b514c - std[4bc72880d5231e4c]::panicking::update_hook::<alloc[8519608b14536aba]::boxed::Box<rustc_driver_impl[13f857263de4d0ff]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f804f3deac6 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h237f4118e41609d8
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/alloc/src/boxed.rs:2030:9
  13:     0x7f804f3deac6 - std::panicking::rust_panic_with_hook::hd39b254275236486
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/panicking.rs:783:13
  14:     0x7f804f3de812 - std::panicking::begin_panic_handler::{{closure}}::h5bbe5cb47793ee20
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/panicking.rs:657:13
  15:     0x7f804f3dbd06 - std::sys_common::backtrace::__rust_end_short_backtrace::h464decb1e79e1351
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f804f3de570 - rust_begin_unwind
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/panicking.rs:645:5
  17:     0x7f804f42a605 - core::panicking::panic_fmt::h679166b76d3d88f6
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/core/src/panicking.rs:72:14
  18:     0x7f8051818128 - <rustc_errors[97e5471a9bbf658f]::diagnostic::Diagnostic>::downgrade_to_delayed_bug
  19:     0x7f80522d73d0 - <dyn rustc_hir_analysis[fed3235f881802f1]::astconv::AstConv>::maybe_lint_impl_trait
  20:     0x7f805229157c - <<dyn rustc_hir_analysis[fed3235f881802f1]::astconv::AstConv>::maybe_lint_bare_trait::{closure#1} as core[25a4dcbb3cee7009]::ops::function::FnOnce<(&mut rustc_errors[97e5471a9bbf658f]::diagnostic_builder::DiagnosticBuilder<()>,)>>::call_once::{shim:vtable#0}
  21:     0x7f80522ac672 - <alloc[8519608b14536aba]::boxed::Box<dyn for<'a, 'b> core[25a4dcbb3cee7009]::ops::function::FnOnce<(&'a mut rustc_errors[97e5471a9bbf658f]::diagnostic_builder::DiagnosticBuilder<'b, ()>,), Output = ()>> as core[25a4dcbb3cee7009]::ops::function::FnOnce<(&mut rustc_errors[97e5471a9bbf658f]::diagnostic_builder::DiagnosticBuilder<()>,)>>::call_once
  22:     0x7f80542f3624 - rustc_middle[a971313bcac29b13]::lint::struct_lint_level::struct_lint_level_impl::<&str>
  23:     0x7f80536338e6 - <dyn rustc_hir_analysis[fed3235f881802f1]::astconv::AstConv>::ast_ty_to_ty_inner
  24:     0x7f8053630a3e - <dyn rustc_hir_analysis[fed3235f881802f1]::astconv::AstConv>::ty_of_fn
  25:     0x7f805362fb6e - rustc_hir_analysis[fed3235f881802f1]::collect::infer_return_ty_for_fn_sig
  26:     0x7f805362edfc - rustc_hir_analysis[fed3235f881802f1]::collect::fn_sig
  27:     0x7f8053628105 - rustc_query_impl[d834e4f78e079c87]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d834e4f78e079c87]::query_impl::fn_sig::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a971313bcac29b13]::query::erase::Erased<[u8; 24usize]>>
  28:     0x7f80536280d5 - <rustc_query_impl[d834e4f78e079c87]::query_impl::fn_sig::dynamic_query::{closure#2} as core[25a4dcbb3cee7009]::ops::function::FnOnce<(rustc_middle[a971313bcac29b13]::ty::context::TyCtxt, rustc_span[3a08aed223fea3cd]::def_id::DefId)>>::call_once
  29:     0x7f8053627713 - rustc_query_system[e673152937f37d93]::query::plumbing::try_execute_query::<rustc_query_impl[d834e4f78e079c87]::DynamicConfig<rustc_query_system[e673152937f37d93]::query::caches::DefaultCache<rustc_span[3a08aed223fea3cd]::def_id::DefId, rustc_middle[a971313bcac29b13]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[d834e4f78e079c87]::plumbing::QueryCtxt, false>
  30:     0x7f8053627135 - rustc_query_impl[d834e4f78e079c87]::query_impl::fn_sig::get_query_non_incr::__rust_end_short_backtrace
  31:     0x7f8053904b84 - <rustc_hir_analysis[fed3235f881802f1]::collect::CollectItemTypesVisitor as rustc_hir[84af96d42540fa18]::intravisit::Visitor>::visit_item
  32:     0x7f8053902bbd - rustc_hir_analysis[fed3235f881802f1]::collect::collect_mod_item_types
  33:     0x7f8053902b51 - rustc_query_impl[d834e4f78e079c87]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d834e4f78e079c87]::query_impl::collect_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a971313bcac29b13]::query::erase::Erased<[u8; 0usize]>>
  34:     0x7f8053e372cf - rustc_query_system[e673152937f37d93]::query::plumbing::try_execute_query::<rustc_query_impl[d834e4f78e079c87]::DynamicConfig<rustc_query_system[e673152937f37d93]::query::caches::DefaultCache<rustc_span[3a08aed223fea3cd]::def_id::LocalModDefId, rustc_middle[a971313bcac29b13]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[d834e4f78e079c87]::plumbing::QueryCtxt, false>
  35:     0x7f8053e36e03 - rustc_query_impl[d834e4f78e079c87]::query_impl::collect_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f80536932e1 - rustc_hir_analysis[fed3235f881802f1]::check_crate
  37:     0x7f8054080319 - rustc_interface[51292d701ac247ab]::passes::analysis
  38:     0x7f805407ff5f - rustc_query_impl[d834e4f78e079c87]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d834e4f78e079c87]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a971313bcac29b13]::query::erase::Erased<[u8; 1usize]>>
  39:     0x7f80543f4164 - rustc_query_system[e673152937f37d93]::query::plumbing::try_execute_query::<rustc_query_impl[d834e4f78e079c87]::DynamicConfig<rustc_query_system[e673152937f37d93]::query::caches::SingleCache<rustc_middle[a971313bcac29b13]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[d834e4f78e079c87]::plumbing::QueryCtxt, false>
  40:     0x7f80543f3f55 - rustc_query_impl[d834e4f78e079c87]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7f80541a1e75 - rustc_interface[51292d701ac247ab]::interface::run_compiler::<core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>, rustc_driver_impl[13f857263de4d0ff]::run_compiler::{closure#0}>::{closure#0}
  42:     0x7f80544244c6 - std[4bc72880d5231e4c]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[51292d701ac247ab]::util::run_in_thread_with_globals<rustc_interface[51292d701ac247ab]::util::run_in_thread_pool_with_globals<rustc_interface[51292d701ac247ab]::interface::run_compiler<core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>, rustc_driver_impl[13f857263de4d0ff]::run_compiler::{closure#0}>::{closure#0}, core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>>::{closure#0}, core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>>
  43:     0x7f80544242f3 - <<std[4bc72880d5231e4c]::thread::Builder>::spawn_unchecked_<rustc_interface[51292d701ac247ab]::util::run_in_thread_with_globals<rustc_interface[51292d701ac247ab]::util::run_in_thread_pool_with_globals<rustc_interface[51292d701ac247ab]::interface::run_compiler<core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>, rustc_driver_impl[13f857263de4d0ff]::run_compiler::{closure#0}>::{closure#0}, core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>>::{closure#0}, core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[25a4dcbb3cee7009]::result::Result<(), rustc_span[3a08aed223fea3cd]::ErrorGuaranteed>>::{closure#1} as core[25a4dcbb3cee7009]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  44:     0x7f804f3e89f5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2001850c7d8d32d3
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/alloc/src/boxed.rs:2016:9
  45:     0x7f804f3e89f5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7c86f6f83b95073a
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/alloc/src/boxed.rs:2016:9
  46:     0x7f804f3e89f5 - std::sys::unix::thread::Thread::new::thread_start::hb8a567c3fcdea6b4
                               at /rustc/595bc6f00369475047538fdae1ff8cea692ac385/library/std/src/sys/unix/thread.rs:108:17
  47:     0x7f804f2d3609 - start_thread
                               at /build/glibc-wuryBv/glibc-2.31/nptl/pthread_create.c:477:8
  48:     0x7f804f1f6353 - clone
                               at /build/glibc-wuryBv/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95
  49:                0x0 - <unknown>

[compiler-errors]

This is a duplicate of #119633