ICE: entered unreachable code: encountered 'Item(Item.. due to Some(ObligationCause ..

[matthiaskrgr]

auto-reduced (treereduce-rust):

struct Node<const D: usize> {}

impl Node<D>
where
    SmallVec<{ D * 2 }>:,
{
    fn new() -> Self {
        let mut node = Node::new();
        (&a, 0)();

        node
    }
}

struct SmallVec<T1, T2> {}

original:

struct Node<const D: usize>

{
    
}

impl<> Node<D>
where
    SmallVec<{ D * 2 }>: 
{
    fn new() -> Self {
        let mut node = Node::new();
        (&a, 0)();
        
        node
    }
}

struct SmallVec<T1, T2> {}

Version information

rustc 1.79.0-nightly (7bb4f0889 2024-04-24)
binary: rustc
commit-hash: 7bb4f0889e8b133c5b03c46f31f2ae6432c00219
commit-date: 2024-04-24
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.4

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

error[E0412]: cannot find type `D` in this scope
 --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:3:11
  |
3 | impl Node<D>
  |           ^ not found in this scope
  |
help: you might be missing a type parameter
  |
3 | impl<D> Node<D>
  |     +++

error[E0425]: cannot find value `D` in this scope
 --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:5:16
  |
5 |     SmallVec<{ D * 2 }>:,
  |                ^ not found in this scope
  |
help: you might be missing a const parameter
  |
3 | impl<const D: /* Type */> Node<D>
  |     +++++++++++++++++++++

error[E0425]: cannot find value `a` in this scope
 --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:9:11
  |
9 |         (&a, 0)();
  |           ^ not found in this scope

error[E0601]: `main` function not found in crate `mvce`
  --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:27
   |
15 | struct SmallVec<T1, T2> {}
   |                           ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs`

error[E0747]: unresolved item provided when a constant was expected
 --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:3:11
  |
3 | impl Node<D>
  |           ^
  |
help: if this generic argument was intended as a const parameter, surround it with braces
  |
3 | impl Node<{ D }>
  |           +   +

error[E0107]: struct takes 2 generic arguments but 1 generic argument was supplied
  --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:5:5
   |
5  |     SmallVec<{ D * 2 }>:,
   |     ^^^^^^^^ --------- supplied 1 generic argument
   |     |
   |     expected 2 generic arguments
   |
note: struct defined here, with 2 generic parameters: `T1`, `T2`
  --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:8
   |
15 | struct SmallVec<T1, T2> {}
   |        ^^^^^^^^ --  --
help: add missing generic argument
   |
5  |     SmallVec<{ D * 2 }, T2>:,
   |                       ++++

error[E0392]: type parameter `T1` is never used
  --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:17
   |
15 | struct SmallVec<T1, T2> {}
   |                 ^^ unused type parameter
   |
   = help: consider removing `T1`, referring to it in a field, or using a marker such as `PhantomData`
   = help: if you intended `T1` to be a const parameter, use `const T1: /* Type */` instead

error[E0392]: type parameter `T2` is never used
  --> /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:21
   |
15 | struct SmallVec<T1, T2> {}
   |                     ^^ unused type parameter
   |
   = help: consider removing `T2`, referring to it in a field, or using a marker such as `PhantomData`
   = help: if you intended `T2` to be a const parameter, use `const T2: /* Type */` instead

thread 'rustc' panicked at compiler/rustc_hir_typeck/src/method/suggest.rs:965:35:
internal error: entered unreachable code: encountered `Item(Item { ident: SmallVec#0, owner_id: DefId(0:8 ~ mvce[ac98]::SmallVec), kind: Struct(Struct { fields: [], recovered: false }, Generics { params: [GenericParam { hir_id: HirId(DefId(0:8 ~ mvce[ac98]::SmallVec).1), def_id: DefId(0:9 ~ mvce[ac98]::SmallVec::T1), name: Plain(T1#0), span: /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:17: 15:19 (#0), pure_wrt_drop: false, kind: Type { default: None, synthetic: false }, colon_span: None, source: Generics }, GenericParam { hir_id: HirId(DefId(0:8 ~ mvce[ac98]::SmallVec).2), def_id: DefId(0:10 ~ mvce[ac98]::SmallVec::T2), name: Plain(T2#0), span: /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:21: 15:23 (#0), pure_wrt_drop: false, kind: Type { default: None, synthetic: false }, colon_span: None, source: Generics }], predicates: [], has_where_clause_predicates: false, where_clause_span: /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:24: 15:24 (#0), span: /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:16: 15:24 (#0) }), span: /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:1: 15:27 (#0), vis_span: /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:1: 15:1 (#0) })` due to `Some(
    ObligationCause {
        span: /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:8:30: 8:33 (#0),
        body_id: DefId(0:7 ~ mvce[ac98]::{impl#0}::new),
        code: BindingObligation(
            DefId(0:8 ~ mvce[ac98]::SmallVec),
            /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:15:17: 15:19 (#0),
        ),
    },
)`
stack backtrace:
   0:     0x7e1150095145 - std::backtrace_rs::backtrace::libunwind::trace::h86d426b17d4e2e3d
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7e1150095145 - std::backtrace_rs::backtrace::trace_unsynchronized::h8c0ef1d148b9d940
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7e1150095145 - std::sys_common::backtrace::_print_fmt::he2abce7aa62cdc3a
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7e1150095145 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0c9241533158777f
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7e11500e421b - core::fmt::rt::Argument::fmt::h733dbde17a4a7d04
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/core/src/fmt/rt.rs:165:63
   5:     0x7e11500e421b - core::fmt::write::h03896a7fdcd4b82f
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/core/src/fmt/mod.rs:1157:21
   6:     0x7e1150089d4f - std::io::Write::write_fmt::hd74e7c0305df2660
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/io/mod.rs:1832:15
   7:     0x7e1150094f1e - std::sys_common::backtrace::_print::hea8c9c28ab87b1b7
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7e1150094f1e - std::sys_common::backtrace::print::hd4bb5623fa4b8de6
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7e1150097889 - std::panicking::default_hook::{{closure}}::h4623b55631f16943
  10:     0x7e11500975cd - std::panicking::default_hook::he5d3fa1d7e671103
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/panicking.rs:298:9
  11:     0x7e114ca456ab - std[73cef507c0358b10]::panicking::update_hook::<alloc[3ec83808c4b91c16]::boxed::Box<rustc_driver_impl[2d410f393cf62b06]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7e1150097f86 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h8ef97572a456b9c7
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/alloc/src/boxed.rs:2036:9
  13:     0x7e1150097f86 - std::panicking::rust_panic_with_hook::h1e2384e63ce90283
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/panicking.rs:799:13
  14:     0x7e1150097d34 - std::panicking::begin_panic_handler::{{closure}}::h8399fde27d16fbcc
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/panicking.rs:664:13
  15:     0x7e1150095609 - std::sys_common::backtrace::__rust_end_short_backtrace::hbc2e58d3e2bbc56f
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7e1150097a67 - rust_begin_unwind
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/panicking.rs:652:5
  17:     0x7e11500e06e3 - core::panicking::panic_fmt::h1b24b925c3ff40f0
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/core/src/panicking.rs:72:14
  18:     0x7e114cc6c689 - <rustc_hir_typeck[3cef36dd3b13bfec]::fn_ctxt::FnCtxt>::report_no_match_method_error
  19:     0x7e114cc92e5a - <rustc_hir_typeck[3cef36dd3b13bfec]::fn_ctxt::FnCtxt>::report_method_error
  20:     0x7e114e178c10 - <rustc_hir_typeck[3cef36dd3b13bfec]::fn_ctxt::FnCtxt>::check_expr_path
  21:     0x7e114e15ab42 - <rustc_hir_typeck[3cef36dd3b13bfec]::fn_ctxt::FnCtxt>::check_call
  22:     0x7e114e8bd674 - <rustc_hir_typeck[3cef36dd3b13bfec]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  23:     0x7e114e8aa95f - <rustc_hir_typeck[3cef36dd3b13bfec]::fn_ctxt::FnCtxt>::check_decl
  24:     0x7e114e8a6391 - <rustc_hir_typeck[3cef36dd3b13bfec]::fn_ctxt::FnCtxt>::check_block_with_expected
  25:     0x7e114e8bdd11 - <rustc_hir_typeck[3cef36dd3b13bfec]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  26:     0x7e114e1342d0 - rustc_hir_typeck[3cef36dd3b13bfec]::check::check_fn
  27:     0x7e114e1293da - rustc_hir_typeck[3cef36dd3b13bfec]::typeck
  28:     0x7e114e128dbd - rustc_query_impl[e8a6f5b0469e51af]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[e8a6f5b0469e51af]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[65b49a3b5d6c0d49]::query::erase::Erased<[u8; 8usize]>>
  29:     0x7e114e1e8531 - rustc_query_system[ccb87b148b9f71e3]::query::plumbing::try_execute_query::<rustc_query_impl[e8a6f5b0469e51af]::DynamicConfig<rustc_query_system[ccb87b148b9f71e3]::query::caches::VecCache<rustc_span[ec1f1d58828cad2c]::def_id::LocalDefId, rustc_middle[65b49a3b5d6c0d49]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[e8a6f5b0469e51af]::plumbing::QueryCtxt, false>
  30:     0x7e114e1e725c - rustc_query_impl[e8a6f5b0469e51af]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  31:     0x7e114e1e6e94 - <rustc_middle[65b49a3b5d6c0d49]::hir::map::Map>::par_body_owners::<rustc_hir_analysis[4525919e9da128a7]::check_crate::{closure#4}>::{closure#0}
  32:     0x7e114e1e5b8d - rustc_hir_analysis[4525919e9da128a7]::check_crate
  33:     0x7e114e1ef507 - rustc_interface[b73225351c325ab5]::passes::analysis
  34:     0x7e114e1ef055 - rustc_query_impl[e8a6f5b0469e51af]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[e8a6f5b0469e51af]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[65b49a3b5d6c0d49]::query::erase::Erased<[u8; 1usize]>>
  35:     0x7e114ebbe665 - rustc_query_system[ccb87b148b9f71e3]::query::plumbing::try_execute_query::<rustc_query_impl[e8a6f5b0469e51af]::DynamicConfig<rustc_query_system[ccb87b148b9f71e3]::query::caches::SingleCache<rustc_middle[65b49a3b5d6c0d49]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[e8a6f5b0469e51af]::plumbing::QueryCtxt, false>
  36:     0x7e114ebbe3c9 - rustc_query_impl[e8a6f5b0469e51af]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  37:     0x7e114ea45993 - rustc_interface[b73225351c325ab5]::interface::run_compiler::<core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>, rustc_driver_impl[2d410f393cf62b06]::run_compiler::{closure#0}>::{closure#1}
  38:     0x7e114ea2f8e7 - std[73cef507c0358b10]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[b73225351c325ab5]::util::run_in_thread_with_globals<rustc_interface[b73225351c325ab5]::util::run_in_thread_pool_with_globals<rustc_interface[b73225351c325ab5]::interface::run_compiler<core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>, rustc_driver_impl[2d410f393cf62b06]::run_compiler::{closure#0}>::{closure#1}, core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>>::{closure#0}, core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>>
  39:     0x7e114ea2f6aa - <<std[73cef507c0358b10]::thread::Builder>::spawn_unchecked_<rustc_interface[b73225351c325ab5]::util::run_in_thread_with_globals<rustc_interface[b73225351c325ab5]::util::run_in_thread_pool_with_globals<rustc_interface[b73225351c325ab5]::interface::run_compiler<core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>, rustc_driver_impl[2d410f393cf62b06]::run_compiler::{closure#0}>::{closure#1}, core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>>::{closure#0}, core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[dad89120088e7e02]::result::Result<(), rustc_span[ec1f1d58828cad2c]::ErrorGuaranteed>>::{closure#2} as core[dad89120088e7e02]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  40:     0x7e11500a1e1b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3679caeb60ab03c2
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/alloc/src/boxed.rs:2022:9
  41:     0x7e11500a1e1b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7e27b57c37e0ef1f
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/alloc/src/boxed.rs:2022:9
  42:     0x7e11500a1e1b - std::sys::pal::unix::thread::Thread::new::thread_start::he8797429d1c20e6e
                               at /rustc/7bb4f0889e8b133c5b03c46f31f2ae6432c00219/library/std/src/sys/pal/unix/thread.rs:108:17
  43:     0x7e11498a955a - <unknown>
  44:     0x7e1149926a3c - <unknown>
  45:                0x0 - <unknown>

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: rustc 1.79.0-nightly (7bb4f0889 2024-04-24) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `<impl at /tmp/icemaker_global_tempdir.hlMXO2zd865n/rustc_testrunner_tmpdir_reporting.tjYcDgjhDnWm/mvce.rs:3:1: 5:26>::new`
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 8 previous errors

Some errors have detailed explanations: E0107, E0392, E0412, E0425, E0601, E0747.
For more information about an error, try `rustc --explain E0107`.

[matthiaskrgr]

#122317 fyi @compiler-errors

[compiler-errors]

i can investigate

@rustbot claim