no errors encountered even though delay_span_bug issued -> unexpected ambiguity: Canonical { max_universe: U0, … }

[Byron]

Code

git clone https://github.com/Byron/gitoxide
cd gitoxide
cargo clippy

Apologies for not having a shorter reproducer, yet.

Meta

rustc --version --verbose:

rustc 1.67.1 (d5a82bbd2 2023-02-07)
binary: rustc
commit-hash: d5a82bbd26e1ad8b7401f6a718a9c57c96905483
commit-date: 2023-02-07
host: aarch64-apple-darwin
release: 1.67.1
LLVM version: 15.0.6

It also exists on nightly:

rustc 1.69.0-nightly (8996ea93b 2023-02-09)
binary: rustc
commit-hash: 8996ea93b6e554148c4286e62b613f12a3ee505c
commit-date: 2023-02-09
host: aarch64-apple-darwin
release: 1.69.0-nightly
LLVM version: 15.0.7

I first noticed it in 1.66 but refrained from posting an issue as I thought it can't only be me.

Error output

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: unexpected ambiguity: Canonical { max_universe: U0, variables: [], value: ParamEnvAnd { param_env: ParamEnv { caller_bounds: [], reveal: UserFacing, constness: NotConst }, value: AliasTy { substs: [std::string::String], def_id: DefId(2:2492 ~ core[4166]::convert::TryInto::Error) } } } Canonical { max_universe: U0, variables: [CanonicalVarInfo { kind: Ty(General(U0)) }], value: QueryResponse { var_values: CanonicalVarValues { var_values: [] }, region_constraints: QueryRegionConstraints { outlives: [], member_constraints: [] }, certainty: Ambiguous, opaque_types: [], value: NormalizationResult { normalized_ty: ^0 } } }

Backtrace

  |
  = note: delayed at    0: std::backtrace::Backtrace::create
             1: <rustc_errors::HandlerInner>::emit_diagnostic
             2: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
             3: <rustc_trait_selection::traits::query::normalize::QueryNormalizer as rustc_middle::ty::fold::FallibleTypeFolder>::try_fold_ty
             4: <rustc_infer::infer::at::At as rustc_trait_selection::traits::query::normalize::QueryNormalizeExt>::query_normalize::<rustc_middle::ty::subst::GenericArg>
             5: <rustc_traits::normalize_erasing_regions::provide::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_middle::ty::ParamEnvAnd<rustc_middle::ty::subst::GenericArg>)>>::call_once
             6: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::try_normalize_generic_arg_after_erasing_regions, rustc_query_impl::plumbing::QueryCtxt>
             7: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::try_normalize_generic_arg_after_erasing_regions, rustc_query_impl::plumbing::QueryCtxt, rustc_middle::dep_graph::dep_node::DepKind>
             8: <rustc_middle::ty::normalize_erasing_regions::TryNormalizeAfterErasingRegionsFolder as rustc_middle::ty::fold::FallibleTypeFolder>::try_fold_ty
             9: clippy_lints::dereference::needless_borrow_impl_arg_position
            10: <&mut clippy_lints::dereference::walk_parents::{closure#0} as core::ops::function::FnMut<(rustc_hir::hir::Node, rustc_hir::hir_id::HirId)>>::call_mut
            11: clippy_utils::walk_to_expr_usage::<clippy_lints::dereference::Position, &mut clippy_lints::dereference::walk_parents::{closure#0}>
            12: <clippy_lints::dereference::Dereferencing as rustc_lint::passes::LateLintPass>::check_expr
            13: <rustc_lint::late::RuntimeCombinedLateLintPass as rustc_lint::passes::LateLintPass>::check_expr
            14: rustc_hir::intravisit::walk_expr::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            15: rustc_hir::intravisit::walk_expr::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            16: rustc_hir::intravisit::walk_block::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            17: rustc_hir::intravisit::walk_expr::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            18: rustc_hir::intravisit::walk_arm::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            19: rustc_hir::intravisit::walk_expr::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            20: rustc_hir::intravisit::walk_block::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            21: rustc_hir::intravisit::walk_expr::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            22: rustc_hir::intravisit::walk_arm::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            23: rustc_hir::intravisit::walk_expr::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            24: rustc_hir::intravisit::walk_block::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            25: rustc_hir::intravisit::walk_expr::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            26: rustc_hir::intravisit::walk_body::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            27: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_body
            28: rustc_hir::intravisit::walk_impl_item::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            29: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_impl_item
            30: rustc_hir::intravisit::walk_item::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            31: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
            32: rustc_hir::intravisit::walk_item::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            33: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
            34: rustc_hir::intravisit::walk_item::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            35: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
            36: rustc_hir::intravisit::walk_item::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            37: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
            38: rustc_hir::intravisit::walk_item::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            39: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
            40: rustc_hir::intravisit::walk_item::<rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass>>
            41: <rustc_lint::late::LateContextAndPass<rustc_lint::late::RuntimeCombinedLateLintPass> as rustc_hir::intravisit::Visitor>::visit_nested_item
            42: rustc_lint::late::late_lint_crate::<rustc_lint::BuiltinCombinedLateLintPass>
            43: <rustc_session::session::Session>::time::<(), rustc_lint::late::check_crate<rustc_lint::BuiltinCombinedLateLintPass, rustc_interface::passes::analysis::{closure#6}::{closure#1}::{closure#2}::{closure#0}::{closure#0}>::{closure#0}::{closure#0}>
            44: <rustc_session::session::Session>::time::<(), rustc_interface::passes::analysis::{closure#6}::{closure#1}::{closure#2}::{closure#0}>
            45: <core::panic::unwind_safe::AssertUnwindSafe<rustc_interface::passes::analysis::{closure#6}::{closure#1}> as core::ops::function::FnOnce<()>>::call_once
            46: <rustc_session::session::Session>::time::<(), rustc_interface::passes::analysis::{closure#6}>
            47: rustc_interface::passes::analysis
            48: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
            49: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
            50: <rustc_interface::passes::QueryContext>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            51: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorGuaranteed>>
            52: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
            53: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            54: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            55: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            56: std::sys::unix::thread::Thread::new::thread_start
            57: __pthread_deallocate


thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1680:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new

note: Clippy version: clippy 0.1.69 (8996ea93 2023-02-09)

[matthiaskrgr]

cc rust-lang/rust-clippy#10009 (comment)