ICE: `attempted .def_id() on invalid res: Err`

[cushionbadak]

Code

trait Tr {
    type Item;
}

type A2 = dyn for<'a> Tr + ?foo(b);

fn main() {}

Original Code (Fuzzing)

trait Tr: ?Sized {
    type Item = &usize;
    //~^ ERROR 18:17: 18:18: in the trait associated type is declared without lifetime parameters, so using a borrowed type for them requires that lifetime to come from the implemented type

    fn poke(&mut self, item: Self::Item) {
        self += *item;
    }
}
//~^ ERROR `?Trait` is not permitted in supertraits

type A1 = dyn Tr + (?Sized);
//~^ ERROR `?Trait` is not permitted in trait object types
type A2 = dyn for<'adds_bnd> Tr + (?simd_fexp2(a));
//~^ ERROR `?Trait` is not permitted in trait object types

fn main() {}


// /root/workspace/seeds_250219/tests/ui/maybe-bounds.rs

Meta

rustc --version --verbose:

rustc 1.87.0-nightly (f8a913b13 2025-02-23)
binary: rustc
commit-hash: f8a913b1381e90379c7ca63ac2b88b9518936628
commit-date: 2025-02-23
host: x86_64-apple-darwin
release: 1.87.0-nightly
LLVM version: 20.1.0

Error output

error[E0658]: `?Trait` is not permitted in trait object types
 --> 05C5.rs:5:28
  |
5 | type A2 = dyn for<'a> Tr + ?foo(b);
  |                            ^^^^^^^
  |
  = help: add `#![feature(more_maybe_bounds)]` to the crate attributes to enable
  = note: this compiler was built on 2025-02-23; consider upgrading it if it is out of date

error[E0405]: cannot find trait `foo` in this scope
 --> 05C5.rs:5:29
  |
5 | type A2 = dyn for<'a> Tr + ?foo(b);
  |                             ^^^ not found in this scope

error[E0412]: cannot find type `b` in this scope
 --> 05C5.rs:5:33
  |
5 | type A2 = dyn for<'a> Tr + ?foo(b);
  |                                 ^ not found in this scope


thread 'rustc' panicked at /rustc/f8a913b1381e90379c7ca63ac2b88b9518936628/compiler/rustc_hir/src/def.rs:683:45:
attempted .def_id() on invalid res: Err

Backtrace

thread 'rustc' panicked at /rustc/f8a913b1381e90379c7ca63ac2b88b9518936628/compiler/rustc_hir/src/def.rs:683:45:
attempted .def_id() on invalid res: Err
stack backtrace:
   0: _rust_begin_unwind
   1: core::panicking::panic_fmt
   2: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::check_for_required_assoc_tys
   3: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_trait_object_ty
   4: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_ty
   5: rustc_hir_analysis::collect::type_of::type_of
      [... omitted 1 frame ...]
   6: rustc_hir_analysis::collect::lower_item
   7: <rustc_hir_analysis::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
   8: rustc_hir_analysis::check::wfcheck::check_item
   9: rustc_hir_analysis::check::wfcheck::check_well_formed
      [... omitted 1 frame ...]
  10: <rustc_middle::hir::ModuleItems>::par_opaques::<rustc_hir_analysis::check::wfcheck::check_mod_type_wf::{closure#4}>::{closure#0}
  11: rustc_hir_analysis::check::wfcheck::check_mod_type_wf
      [... omitted 1 frame ...]
  12: rustc_hir_analysis::check_crate
  13: rustc_interface::passes::run_required_analyses
  14: rustc_interface::passes::analysis
      [... omitted 1 frame ...]
  15: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>
  16: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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

note: please attach the file at `/Volumes/T7/workspace/250224 scratch/codes/rustc-ice-2025-02-24T05_09_01-67498.txt` to your bug report

query stack during panic:
#0 [type_of] expanding type alias `A2`
#1 [check_well_formed] checking that `A2` is well-formed
#2 [check_mod_type_wf] checking that types are well-formed in top-level module
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0405, E0412, E0658.
For more information about an error, try `rustc --explain E0405`.

Notes

• ICE location: compiler/rustc_hir/src/def.rs Line-683
  

  rust/compiler/rustc_hir/src/def.rs

  Lines 677 to 684 in f8a913b

  	impl<Id> Res<Id> {
  	/// Return the `DefId` of this `Def` if it has an ID, else panic.
  	pub fn def_id(&self) -> DefId
  	where
  	Id: Debug,
  	{
  	self.opt_def_id().unwrap_or_else(|| panic!("attempted .def_id() on invalid res: {self:?}"))
  	}

[moxian]

cargo-bisect-rustc points to nightly-2024-07-27 (specifically 7120fda...7c2012d ), so probably #121676 which introduced more_maybe_bounds feature gate.

[cyrgani]

a bit simpler:

trait Tr {
    type Item;
}

fn main() {
    let _: dyn Tr + ?Foo();
}