ICE `in get_predicate_from_bound, at rust/typecheck/... | Rust-GCC/gccrs

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auto-reduced (treereduce-rust):

//@compile-flags: -frust-incomplete-and-experimental-compiler-do-not-use
trait Fn {}

impl Fn for () {
    const ASSOC: &dyn Fn(_) = 1i32;
}

fn Fn() {}

original:

trait Fn {
    const ASSOC: i32;
}

impl Fn for () {
    const ASSOC: &dyn Fn(_) = 1i32;
    //~^ ERROR the placeholder `_` is not allowed within types on item signatures for associated constants
}

fn Fn() {}

Version information:

5dc8c4d20d62462ebce137c6e5146235ab9e9e2e

Command:
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 -frust-incomplete-and-experimental-compiler-do-not-use

Program output

crab1: internal compiler error: in get_predicate_from_bound, at rust/typecheck/rust-tyty-bounds.cc:297
0x2fecaf8 internal_error(char const*, ...)
	../../gcc/diagnostic-global-context.cc:517
0xc0e04d fancy_abort(char const*, int, char const*)
	../../gcc/diagnostic.cc:1803
0x903e71 Rust::Resolver::TypeCheckBase::get_predicate_from_bound(Rust::HIR::TypePath&, tl::optional<std::reference_wrapper<Rust::HIR::Type> >, Rust::BoundPolarity, bool, bool)
	../../gcc/rust/typecheck/rust-tyty-bounds.cc:297
0x108c872 Rust::Resolver::TypeCheckType::visit(Rust::HIR::TraitObjectType&)
	../../gcc/rust/typecheck/rust-hir-type-check-type.cc:674
0x1082477 Rust::Resolver::TypeCheckType::Resolve(Rust::HIR::Type&)
	../../gcc/rust/typecheck/rust-hir-type-check-type.cc:71
0x1082be4 Rust::Resolver::TypeCheckType::Resolve(Rust::HIR::Type&)
	../../gcc/rust/typecheck/rust-hir-type-check-type.cc:67
0x1082be4 Rust::Resolver::TypeCheckType::visit(Rust::HIR::ReferenceType&)
	../../gcc/rust/typecheck/rust-hir-type-check-type.cc:735
0x1082477 Rust::Resolver::TypeCheckType::Resolve(Rust::HIR::Type&)
	../../gcc/rust/typecheck/rust-hir-type-check-type.cc:71
0x10838b7 Rust::Resolver::TypeCheckType::Resolve(Rust::HIR::Type&)
	../../gcc/rust/typecheck/rust-hir-type-check-type.cc:67
0x10afb44 Rust::Resolver::TypeCheckImplItem::visit(Rust::HIR::ConstantItem&)
	../../gcc/rust/typecheck/rust-hir-type-check-implitem.cc:397
0x10b08cc Rust::Resolver::TypeCheckImplItem::Resolve(Rust::HIR::ImplBlock&, Rust::HIR::ImplItem&, Rust::TyTy::BaseType*, std::vector<Rust::TyTy::SubstitutionParamMapping, std::allocator<Rust::TyTy::SubstitutionParamMapping> >)
	../../gcc/rust/typecheck/rust-hir-type-check-implitem.cc:194
0x10b08cc Rust::Resolver::TypeCheckImplItem::Resolve(Rust::HIR::ImplBlock&, Rust::HIR::ImplItem&, Rust::TyTy::BaseType*, std::vector<Rust::TyTy::SubstitutionParamMapping, std::allocator<Rust::TyTy::SubstitutionParamMapping> >)
	../../gcc/rust/typecheck/rust-hir-type-check-implitem.cc:178
0x10786c7 Rust::Resolver::TypeCheckItem::visit(Rust::HIR::ImplBlock&)
	../../gcc/rust/typecheck/rust-hir-type-check-item.cc:534
0x106e185 Rust::Resolver::TypeCheckItem::Resolve(Rust::HIR::Item&)
	../../gcc/rust/typecheck/rust-hir-type-check-item.cc:59
0x100adcb Rust::Resolver::TypeResolution::Resolve(Rust::HIR::Crate&)
	../../gcc/rust/typecheck/rust-hir-type-check.cc:74
0xdb97f8 Rust::Session::compile_crate(char const*)
	../../gcc/rust/rust-session-manager.cc:685
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Start with the reduced Rust reproducer and run it using -frust-incomplete-and-experimental-compiler-do-not-use. Read gcc/rust/typecheck/rust-tyty-bounds.cc around lines 291-303, then follow the stack into rust-hir-type-check-type.cc. Done means this input no longer causes an internal compiler error and produces the appropriate compiler result.

Written by the indexing model from the issue text.

ICE `in get_predicate_from_bound, at rust/typecheck/rust-tyty-bounds.cc:297`

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