ICE: index out of bounds, -Wrust-2021-incompatible-closure-capture

[matthiaskrgr]

Code

enum Either {
    One(X),
    Two(X),
}

struct X(Y);

struct Y;

fn move_into_fnmut() {
    let x = X(Y);

    consume_fnmut(|| {
        let Either::Two(ref mut _t) = x;

        let X(mut _t) = x;
    });
}

Meta

rustc --version --verbose:

rustc 1.70.0-nightly (ec2f40c6b 2023-03-30)
binary: rustc
commit-hash: ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b
commit-date: 2023-03-30
host: x86_64-unknown-linux-gnu
release: 1.70.0-nightly
LLVM version: 16.0.0

Error output

rustc -Wrust-2021-incompatible-closure-capture treereduce.out

error[E0601]: `main` function not found in crate `treereduce`
  --> treereduce.out:18:2
   |
18 | }
   |  ^ consider adding a `main` function to `treereduce.out`

error[E0308]: mismatched types
  --> treereduce.out:14:13
   |
14 |         let Either::Two(ref mut _t) = x;
   |             ^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `X`
   |             |
   |             expected `X`, found `Either`

error[E0425]: cannot find function `consume_fnmut` in this scope
  --> treereduce.out:13:5
   |
13 |     consume_fnmut(|| {
   |     ^^^^^^^^^^^^^ not found in this scope

Backtrace

thread 'rustc' panicked at 'index out of bounds: the len is 1 but the index is 1', compiler/rustc_middle/src/ty/adt.rs:177:10
stack backtrace:
   0:     0x7f90bd29ae8a - std::backtrace_rs::backtrace::libunwind::trace::h0800f724f14b9f23
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f90bd29ae8a - std::backtrace_rs::backtrace::trace_unsynchronized::heb729c2b48914e5d
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f90bd29ae8a - std::sys_common::backtrace::_print_fmt::hfea18c777a6816a8
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f90bd29ae8a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5b335f1b57b7cfd3
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f90bd2fee6f - core::fmt::write::hfc269b47768b84d6
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/core/src/fmt/mod.rs:1254:17
   5:     0x7f90bd28d9c5 - std::io::Write::write_fmt::h1d662a9c8dd6348d
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/io/mod.rs:1698:15
   6:     0x7f90bd29ac55 - std::sys_common::backtrace::_print::h077a497ebae0e284
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f90bd29ac55 - std::sys_common::backtrace::print::h4c1bfafb31892c37
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f90bd29d8fe - std::panicking::default_hook::{{closure}}::h1d180e0dd97821e1
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/panicking.rs:269:22
   9:     0x7f90bd29d6a5 - std::panicking::default_hook::hb57aa318320cb549
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/panicking.rs:288:9
  10:     0x7f90bc084795 - rustc_driver_impl[5ba0129e8085a63c]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f90bd29e0f4 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h3b37cd4b5b400fd5
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/alloc/src/boxed.rs:1990:9
  12:     0x7f90bd29e0f4 - std::panicking::rust_panic_with_hook::h9f9047c578e712fa
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/panicking.rs:694:13
  13:     0x7f90bd29de69 - std::panicking::begin_panic_handler::{{closure}}::h65c68fe10fd36269
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/panicking.rs:581:13
  14:     0x7f90bd29b2f6 - std::sys_common::backtrace::__rust_end_short_backtrace::h01858bd16434bb8d
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/sys_common/backtrace.rs:150:18
  15:     0x7f90bd29dbc2 - rust_begin_unwind
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/panicking.rs:577:5
  16:     0x7f90bd2fb273 - core::panicking::panic_fmt::h63711dd7e9b0b59a
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/core/src/panicking.rs:67:14
  17:     0x7f90bd2fb3e2 - core::panicking::panic_bounds_check::h75e67454168bf3b9
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/core/src/panicking.rs:162:5
  18:     0x7f90bc5f56a9 - rustc_middle[a72f0da90161fe4d]::ty::closure::place_to_string_for_capture
  19:     0x7f90bb4c696b - <rustc_hir_typeck[80b0682908fd489]::fn_ctxt::FnCtxt>::analyze_closure
  20:     0x7f90ba128ceb - <rustc_hir_typeck[80b0682908fd489]::upvar::InferBorrowKindVisitor as rustc_hir[769709ae1002f61b]::intravisit::Visitor>::visit_expr
  21:     0x7f90ba128692 - <rustc_hir_typeck[80b0682908fd489]::upvar::InferBorrowKindVisitor as rustc_hir[769709ae1002f61b]::intravisit::Visitor>::visit_expr
  22:     0x7f90ba128aeb - <rustc_hir_typeck[80b0682908fd489]::upvar::InferBorrowKindVisitor as rustc_hir[769709ae1002f61b]::intravisit::Visitor>::visit_expr
  23:     0x7f90baf6be1b - rustc_hir_typeck[80b0682908fd489]::typeck
  24:     0x7f90ba1b7113 - rustc_query_system[c2820fdbf5c6d6ca]::query::plumbing::try_execute_query::<rustc_query_impl[9d23c39401f72dce]::queries::typeck, rustc_query_impl[9d23c39401f72dce]::plumbing::QueryCtxt>
  25:     0x7f90bb7d166b - rustc_data_structures[2fae5ecf9dd28fbb]::sync::par_for_each_in::<&[rustc_span[fd4f398dc0172457]::def_id::LocalDefId], <rustc_middle[a72f0da90161fe4d]::hir::map::Map>::par_body_owners<rustc_hir_typeck[80b0682908fd489]::typeck_item_bodies::{closure#0}>::{closure#0}>
  26:     0x7f90bb7d143f - rustc_hir_typeck[80b0682908fd489]::typeck_item_bodies
  27:     0x7f90bb83cab7 - rustc_query_system[c2820fdbf5c6d6ca]::query::plumbing::try_execute_query::<rustc_query_impl[9d23c39401f72dce]::queries::typeck_item_bodies, rustc_query_impl[9d23c39401f72dce]::plumbing::QueryCtxt>
  28:     0x7f90bb83c7cc - <rustc_query_impl[9d23c39401f72dce]::Queries as rustc_middle[a72f0da90161fe4d]::ty::query::QueryEngine>::typeck_item_bodies
  29:     0x7f90bb4e197f - <rustc_session[173a7fb0306a5cb1]::session::Session>::time::<(), rustc_hir_analysis[d7ef42721b387ff3]::check_crate::{closure#7}>
  30:     0x7f90bb4de3f7 - rustc_hir_analysis[d7ef42721b387ff3]::check_crate
  31:     0x7f90bb4d8241 - rustc_interface[415d18af8a4706e7]::passes::analysis
  32:     0x7f90bb83bb82 - rustc_query_system[c2820fdbf5c6d6ca]::query::plumbing::try_execute_query::<rustc_query_impl[9d23c39401f72dce]::queries::analysis, rustc_query_impl[9d23c39401f72dce]::plumbing::QueryCtxt>
  33:     0x7f90bb83b880 - <rustc_query_impl[9d23c39401f72dce]::Queries as rustc_middle[a72f0da90161fe4d]::ty::query::QueryEngine>::analysis
  34:     0x7f90bb1ff79e - <rustc_interface[415d18af8a4706e7]::queries::QueryResult<&rustc_middle[a72f0da90161fe4d]::ty::context::GlobalCtxt>>::enter::<core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>, rustc_driver_impl[5ba0129e8085a63c]::run_compiler::{closure#1}::{closure#2}::{closure#4}>
  35:     0x7f90bb1fe33e - <rustc_interface[415d18af8a4706e7]::interface::Compiler>::enter::<rustc_driver_impl[5ba0129e8085a63c]::run_compiler::{closure#1}::{closure#2}, core[ad7470cf32ab1c97]::result::Result<core[ad7470cf32ab1c97]::option::Option<rustc_interface[415d18af8a4706e7]::queries::Linker>, rustc_span[fd4f398dc0172457]::ErrorGuaranteed>>
  36:     0x7f90bb1fc4f1 - rustc_span[fd4f398dc0172457]::with_source_map::<core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>, rustc_interface[415d18af8a4706e7]::interface::run_compiler<core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>, rustc_driver_impl[5ba0129e8085a63c]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  37:     0x7f90bb1fba9f - std[30ef443cf2df054a]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[415d18af8a4706e7]::util::run_in_thread_pool_with_globals<rustc_interface[415d18af8a4706e7]::interface::run_compiler<core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>, rustc_driver_impl[5ba0129e8085a63c]::run_compiler::{closure#1}>::{closure#0}, core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>>
  38:     0x7f90bb91934e - <<std[30ef443cf2df054a]::thread::Builder>::spawn_unchecked_<rustc_interface[415d18af8a4706e7]::util::run_in_thread_pool_with_globals<rustc_interface[415d18af8a4706e7]::interface::run_compiler<core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>, rustc_driver_impl[5ba0129e8085a63c]::run_compiler::{closure#1}>::{closure#0}, core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ad7470cf32ab1c97]::result::Result<(), rustc_span[fd4f398dc0172457]::ErrorGuaranteed>>::{closure#1} as core[ad7470cf32ab1c97]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  39:     0x7f90bd2a81d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6e08d5234042fb15
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/alloc/src/boxed.rs:1976:9
  40:     0x7f90bd2a81d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2c5056bcb5d46eb1
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/alloc/src/boxed.rs:1976:9
  41:     0x7f90bd2a81d5 - std::sys::unix::thread::Thread::new::thread_start::hbc95b3c4a4c1dd3a
                               at /rustc/ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b/library/std/src/sys/unix/thread.rs:108:17
  42:     0x7f90b8c66bb5 - <unknown>
  43:     0x7f90b8ce8d90 - <unknown>
  44:                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: rustc 1.70.0-nightly (ec2f40c6b 2023-03-30) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck] type-checking `move_into_fnmut`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0308, E0425, E0601.
For more information about an error, try `rustc --explain E0308`.

[matthiaskrgr]

searched toolchains nightly-2021-07-01 through nightly-2023-03-31

---

Regression in nightly-2021-07-12

---