[ICE]: failed to resolve instance for <&mut &mut &mut &mut &mut &mut....

[matthiaskrgr]

Code

use std::{
    fs::File,
    io::{Result, Write}};
enum Tree {
    Leaf(bool),
    Parent(Vec<Tree>)}
impl Tree {
    fn serialize<T: Write>(self, mut writer: T) -> Result<()> {
        match self {
            Tree::Leaf(_) => Ok(()),
            Tree::Parent(children) => {
                for child in children {
                    child.serialize(writer.by_ref())?}
                Ok(())
            }
        }
    }
}
fn main() -> Result<()> {
    let buffer = File::create("")?;
    Tree::Parent(vec![]).serialize(buffer)
}

Meta

rustc --version --verbose:

rustc 1.95.0-nightly (838709580 2026-02-17)
binary: rustc
commit-hash: 8387095803f21a256a9a772ac1f9b41ed4d5aa0a
commit-date: 2026-02-17
host: x86_64-unknown-linux-gnu
release: 1.95.0-nightly
LLVM version: 22.1.0

Error output

rustc -Znext-solver=globally file.rs

<output>

Backtrace

warning: variant `Leaf` is never constructed
 --> a.rs:5:5
  |
4 | enum Tree {
  |      ---- variant in this enum
5 |     Leaf(bool),
  |     ^^^^
  |
  = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default

error: internal compiler error: /rustc-dev/8387095803f21a256a9a772ac1f9b41ed4d5aa0a/compiler/rustc_middle/src/ty/instance.rs:579:21: failed to resolve instance for <&mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut File as std::io::Write>::by_ref
  --> a.rs:13:37
   |
13 |                     child.serialize(writer.by_ref())?}
   |                                     ^^^^^^^^^^^^^^^


thread 'rustc' (311951) panicked at /rustc-dev/8387095803f21a256a9a772ac1f9b41ed4d5aa0a/compiler/rustc_middle/src/ty/instance.rs:579:21:
Box<dyn Any>
stack backtrace:
   0:     0x7f9e1c3c15cb - <<std[9ed7a72950199a90]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[81c8857e8c954940]::fmt::Display>::fmt
   1:     0x7f9e1ca21208 - core[81c8857e8c954940]::fmt::write
   2:     0x7f9e1c3d8846 - <std[9ed7a72950199a90]::sys::stdio::unix::Stderr as std[9ed7a72950199a90]::io::Write>::write_fmt
   3:     0x7f9e1c397688 - std[9ed7a72950199a90]::panicking::default_hook::{closure#0}
   4:     0x7f9e1c3b4a33 - std[9ed7a72950199a90]::panicking::default_hook
   5:     0x7f9e1b37e9ef - std[9ed7a72950199a90]::panicking::update_hook::<alloc[baed8ab89d997876]::boxed::Box<rustc_driver_impl[5db22dd92f525ab]::install_ice_hook::{closure#1}>>::{closure#0}
   6:     0x7f9e1c3b4d12 - std[9ed7a72950199a90]::panicking::panic_with_hook
   7:     0x7f9e1b3b29e1 - std[9ed7a72950199a90]::panicking::begin_panic::<rustc_errors[5e9c1cabf743c53a]::ExplicitBug>::{closure#0}
   8:     0x7f9e1b3ab786 - std[9ed7a72950199a90]::sys::backtrace::__rust_end_short_backtrace::<std[9ed7a72950199a90]::panicking::begin_panic<rustc_errors[5e9c1cabf743c53a]::ExplicitBug>::{closure#0}, !>
   9:     0x7f9e1b3ab5fb - std[9ed7a72950199a90]::panicking::begin_panic::<rustc_errors[5e9c1cabf743c53a]::ExplicitBug>
  10:     0x7f9e1b3bdf71 - <rustc_errors[5e9c1cabf743c53a]::diagnostic::BugAbort as rustc_errors[5e9c1cabf743c53a]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  11:     0x7f9e1b95eb6c - <rustc_errors[5e9c1cabf743c53a]::DiagCtxtHandle>::span_bug::<rustc_span[9d095f6e85d4ed40]::span_encoding::Span, alloc[baed8ab89d997876]::string::String>
  12:     0x7f9e1b9880e6 - rustc_middle[2fc1cbf9843c119b]::util::bug::opt_span_bug_fmt::<rustc_span[9d095f6e85d4ed40]::span_encoding::Span>::{closure#0}
  13:     0x7f9e1b988292 - rustc_middle[2fc1cbf9843c119b]::ty::context::tls::with_opt::<rustc_middle[2fc1cbf9843c119b]::util::bug::opt_span_bug_fmt<rustc_span[9d095f6e85d4ed40]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7f9e1b978e0b - rustc_middle[2fc1cbf9843c119b]::ty::context::tls::with_context_opt::<rustc_middle[2fc1cbf9843c119b]::ty::context::tls::with_opt<rustc_middle[2fc1cbf9843c119b]::util::bug::opt_span_bug_fmt<rustc_span[9d095f6e85d4ed40]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7f9e19d8e188 - rustc_middle[2fc1cbf9843c119b]::util::bug::span_bug_fmt::<rustc_span[9d095f6e85d4ed40]::span_encoding::Span>
  16:     0x7f9e1cda01dc - <rustc_middle[2fc1cbf9843c119b]::ty::instance::Instance>::expect_resolve
  17:     0x7f9e1cee08e1 - <rustc_monomorphize[b42b2d8bff33e8e7]::collector::MirUsedCollector as rustc_middle[2fc1cbf9843c119b]::mir::visit::Visitor>::visit_terminator
  18:     0x7f9e1cedaf9c - rustc_monomorphize[b42b2d8bff33e8e7]::collector::items_of_instance
  19:     0x7f9e1ceda7e7 - rustc_query_impl[86d0b9a9bed47822]::query_impl::items_of_instance::invoke_provider_fn::__rust_begin_short_backtrace
  20:     0x7f9e1d720742 - rustc_query_impl[86d0b9a9bed47822]::execution::try_execute_query::<rustc_middle[2fc1cbf9843c119b]::query::caches::DefaultCache<(rustc_middle[2fc1cbf9843c119b]::ty::instance::Instance, rustc_middle[2fc1cbf9843c119b]::mir::mono::CollectionMode), rustc_middle[2fc1cbf9843c119b]::query::erase::ErasedData<[u8; 32usize]>>, {rustc_query_impl[86d0b9a9bed47822]::QueryFlags { is_anon: false, is_depth_limit: false, is_feedable: false }}, false>
  21:     0x7f9e1d720369 - rustc_query_impl[86d0b9a9bed47822]::query_impl::items_of_instance::get_query_non_incr::__rust_end_short_backtrace
  22:     0x7f9e1decfa3f - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  23:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  24:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  25:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  26:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  27:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  28:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  29:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  30:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  31:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  32:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  33:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  34:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  35:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  36:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  37:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  38:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  39:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  40:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  41:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  42:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  43:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  44:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  45:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  46:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  47:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  48:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  49:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  50:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  51:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  52:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  53:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  54:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  55:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  56:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  57:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  58:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  59:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  60:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  61:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  62:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  63:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  64:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  65:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  66:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  67:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  68:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  69:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  70:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  71:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  72:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  73:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  74:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  75:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  76:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  77:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  78:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  79:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  80:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  81:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  82:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  83:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  84:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  85:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  86:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  87:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  88:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  89:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  90:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  91:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  92:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  93:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  94:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  95:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  96:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  97:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  98:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
  99:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 100:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 101:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 102:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 103:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 104:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 105:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 106:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 107:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 108:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 109:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 110:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 111:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 112:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 113:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 114:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 115:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 116:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 117:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 118:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 119:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 120:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 121:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 122:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 123:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 124:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 125:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 126:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 127:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 128:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 129:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 130:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 131:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 132:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 133:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 134:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 135:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 136:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 137:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 138:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 139:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 140:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 141:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 142:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 143:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 144:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 145:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 146:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 147:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 148:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 149:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 150:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 151:     0x7f9e1ded184d - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_items_rec
 152:     0x7f9e1cff2671 - rustc_monomorphize[b42b2d8bff33e8e7]::collector::collect_crate_mono_items::{closure#1}::{closure#0}
 153:     0x7f9e1d3e6297 - rustc_monomorphize[b42b2d8bff33e8e7]::partitioning::collect_and_partition_mono_items
 154:     0x7f9e1d3e5f30 - rustc_query_impl[86d0b9a9bed47822]::query_impl::collect_and_partition_mono_items::invoke_provider_fn::__rust_begin_short_backtrace
 155:     0x7f9e1dcefa79 - rustc_query_impl[86d0b9a9bed47822]::execution::try_execute_query::<rustc_middle[2fc1cbf9843c119b]::query::caches::SingleCache<rustc_middle[2fc1cbf9843c119b]::query::erase::ErasedData<[u8; 24usize]>>, {rustc_query_impl[86d0b9a9bed47822]::QueryFlags { is_anon: false, is_depth_limit: false, is_feedable: false }}, false>
 156:     0x7f9e1dcef815 - rustc_query_impl[86d0b9a9bed47822]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
 157:     0x7f9e1dcf820f - rustc_codegen_ssa[a12292751aae6474]::base::codegen_crate::<rustc_codegen_llvm[d1a5f4e957808973]::LlvmCodegenBackend>
 158:     0x7f9e1dcf7ed1 - <rustc_codegen_llvm[d1a5f4e957808973]::LlvmCodegenBackend as rustc_codegen_ssa[a12292751aae6474]::traits::backend::CodegenBackend>::codegen_crate
 159:     0x7f9e1dccf08d - <rustc_interface[9f0e450cc6ea9315]::queries::Linker>::codegen_and_build_linker
 160:     0x7f9e1dccbd6f - <rustc_interface[9f0e450cc6ea9315]::passes::create_and_enter_global_ctxt<core[81c8857e8c954940]::option::Option<rustc_interface[9f0e450cc6ea9315]::queries::Linker>, rustc_driver_impl[5db22dd92f525ab]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[81c8857e8c954940]::ops::function::FnOnce<(&rustc_session[6f36801eff1b8bba]::session::Session, rustc_middle[2fc1cbf9843c119b]::ty::context::CurrentGcx, alloc[baed8ab89d997876]::sync::Arc<rustc_data_structures[6c24676c85babd96]::jobserver::Proxy>, &std[9ed7a72950199a90]::sync::once_lock::OnceLock<rustc_middle[2fc1cbf9843c119b]::ty::context::GlobalCtxt>, &rustc_data_structures[6c24676c85babd96]::sync::worker_local::WorkerLocal<rustc_middle[2fc1cbf9843c119b]::arena::Arena>, &rustc_data_structures[6c24676c85babd96]::sync::worker_local::WorkerLocal<rustc_hir[fe7d6d55c041f1f]::Arena>, rustc_driver_impl[5db22dd92f525ab]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
 161:     0x7f9e1dbd820c - rustc_interface[9f0e450cc6ea9315]::interface::run_compiler::<(), rustc_driver_impl[5db22dd92f525ab]::run_compiler::{closure#0}>::{closure#1}
 162:     0x7f9e1dc0123e - std[9ed7a72950199a90]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[9f0e450cc6ea9315]::util::run_in_thread_with_globals<rustc_interface[9f0e450cc6ea9315]::util::run_in_thread_pool_with_globals<rustc_interface[9f0e450cc6ea9315]::interface::run_compiler<(), rustc_driver_impl[5db22dd92f525ab]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
 163:     0x7f9e1dc01920 - <std[9ed7a72950199a90]::thread::lifecycle::spawn_unchecked<rustc_interface[9f0e450cc6ea9315]::util::run_in_thread_with_globals<rustc_interface[9f0e450cc6ea9315]::util::run_in_thread_pool_with_globals<rustc_interface[9f0e450cc6ea9315]::interface::run_compiler<(), rustc_driver_impl[5db22dd92f525ab]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[81c8857e8c954940]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
 164:     0x7f9e1dc027ac - <std[9ed7a72950199a90]::sys::thread::unix::Thread>::new::thread_start
 165:     0x7f9e176a598b - <unknown>
 166:     0x7f9e17729a0c - <unknown>
 167:                0x0 - <unknown>

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 `/tmp/im2/rustc-ice-2026-02-18T21_55_24-311933.txt` to your bug report

note: rustc 1.95.0-nightly (838709580 2026-02-17) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z next-solver=globally

query stack during panic:
#0 [items_of_instance] collecting items used by `<impl at a.rs:7:1: 7:10>::serialize::<&mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut std::fs::File>`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: aborting due to 1 previous error; 1 warning emitted

[matthiaskrgr]

bisects to #144064

[matthiaskrgr]

another one

fn main() {
    decode(vec![])
}
fn decode(bitstream: Vec<u64>) {
    let mut bitstream_itr = bitstream.into_iter();
    match decode_packet(&mut bitstream_itr) {
        _ => (),
    }
}
fn decode_packets<I: Iterator<Item = u64>>(itr: &mut I) {
    let res;
    loop {
        match decode_packet(itr) {
            _ => {}
        }
    }
    res
}
fn decode_packet<I: Iterator<Item = u64>>(itr: &mut I) -> Option<()> {
    decode_packets(&mut itr.take(0));
    Some(())
}