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ICE: `None` in `compiler/rustc_mir_build/src/build/matches/mod.rs`

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A-closures A-impl-trait A-patterns C-bug fixed-by-next-solver I-ICE S-bug-has-test T-compiler T-types
Dominant language
Rust
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Description

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snippet:

fn enum_upvar() {
    type T = impl Copy;
    let foo: T = Some((1u32, 2u32));
    let x = move || {
        match foo {
            None => (),
            Some(yield) => (),
        }
    };
}

Version information

rustc 1.77.0-nightly (ae9d24de8 2024-01-09)
binary: rustc
commit-hash: ae9d24de80b00b4158d1a29a212a6b02aeda0e75
commit-date: 2024-01-09
host: x86_64-unknown-linux-gnu
release: 1.77.0-nightly
LLVM version: 17.0.6

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2021

Program output 

error: expected identifier, found reserved keyword `yield`
 --> /tmp/icemaker_global_tempdir.x6UZht6u4SjU/rustc_testrunner_tmpdir_reporting.JA7y372p2elJ/mvce.rs:7:18
  |
7 |             Some(yield) => (),
  |                  ^^^^^ expected identifier, found reserved keyword
  |
help: escape `yield` to use it as an identifier
  |
7 |             Some(r#yield) => (),
  |                  ++

error[E0658]: `impl Trait` in type aliases is unstable
 --> /tmp/icemaker_global_tempdir.x6UZht6u4SjU/rustc_testrunner_tmpdir_reporting.JA7y372p2elJ/mvce.rs:2:14
  |
2 |     type T = impl Copy;
  |              ^^^^^^^^^
  |
  = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
  = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable

error[E0601]: `main` function not found in crate `mvce`
  --> /tmp/icemaker_global_tempdir.x6UZht6u4SjU/rustc_testrunner_tmpdir_reporting.JA7y372p2elJ/mvce.rs:10:2
   |
10 | }
   |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.x6UZht6u4SjU/rustc_testrunner_tmpdir_reporting.JA7y372p2elJ/mvce.rs`

warning: unused variable: `x`
 --> /tmp/icemaker_global_tempdir.x6UZht6u4SjU/rustc_testrunner_tmpdir_reporting.JA7y372p2elJ/mvce.rs:4:9
  |
4 |     let x = move || {
  |         ^ help: if this is intentional, prefix it with an underscore: `_x`
  |
  = note: `#[warn(unused_variables)]` on by default

thread 'rustc' panicked at compiler/rustc_mir_build/src/build/expr/as_place.rs:253:31:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x7f3a2358c7e6 - std::backtrace_rs::backtrace::libunwind::trace::h5bb3bcbd9bf843dc
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f3a2358c7e6 - std::backtrace_rs::backtrace::trace_unsynchronized::h2be7c62a2fc2f0ae
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f3a2358c7e6 - std::sys_common::backtrace::_print_fmt::h0eb797837574729c
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f3a2358c7e6 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9cfb89fe3b10d684
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f3a235deed0 - core::fmt::rt::Argument::fmt::h05c1336e950869a8
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/core/src/fmt/rt.rs:142:9
   5:     0x7f3a235deed0 - core::fmt::write::hf9ed93bf0be8a0ba
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f3a2358014f - std::io::Write::write_fmt::h575af11d100da1a8
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/io/mod.rs:1810:15
   7:     0x7f3a2358c5c4 - std::sys_common::backtrace::_print::h4efb82e5b25d472e
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f3a2358c5c4 - std::sys_common::backtrace::print::h6788dd5df6617703
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f3a2358f357 - std::panicking::default_hook::{{closure}}::hfa58db406ef5c661
  10:     0x7f3a2358f0b9 - std::panicking::default_hook::h60a66ef279ae47ef
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/panicking.rs:292:9
  11:     0x7f3a2635c9bc - std[6b9fb5ba93d727e9]::panicking::update_hook::<alloc[30b92f95685fae2c]::boxed::Box<rustc_driver_impl[54e7dbd11c712533]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f3a2358faa6 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h37eedb2cb21c4dfc
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/alloc/src/boxed.rs:2030:9
  13:     0x7f3a2358faa6 - std::panicking::rust_panic_with_hook::hbea871998462fd45
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/panicking.rs:785:13
  14:     0x7f3a2358f7b9 - std::panicking::begin_panic_handler::{{closure}}::h45ad8d6a57ea4023
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/panicking.rs:651:13
  15:     0x7f3a2358cce6 - std::sys_common::backtrace::__rust_end_short_backtrace::h6e4a62ed56190aa9
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f3a2358f550 - rust_begin_unwind
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/panicking.rs:647:5
  17:     0x7f3a235db5d5 - core::panicking::panic_fmt::hfc52fd0216040145
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/core/src/panicking.rs:72:14
  18:     0x7f3a235db693 - core::panicking::panic::h37bd7f6a16f3c553
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/core/src/panicking.rs:144:5
  19:     0x7f3a2802fef5 - <rustc_mir_build[a392e445574d452]::build::Builder>::match_simplified_candidates
  20:     0x7f3a27b0f562 - <rustc_mir_build[a392e445574d452]::build::Builder>::lower_match_tree
  21:     0x7f3a27fbb5c1 - <rustc_mir_build[a392e445574d452]::build::Builder>::match_expr
  22:     0x7f3a27b06905 - <rustc_mir_build[a392e445574d452]::build::Builder>::expr_into_dest
  23:     0x7f3a27b06d05 - <rustc_mir_build[a392e445574d452]::build::Builder>::expr_into_dest
  24:     0x7f3a249a92dd - <rustc_mir_build[a392e445574d452]::build::Builder>::ast_block_stmts
  25:     0x7f3a27b05ca3 - <rustc_mir_build[a392e445574d452]::build::Builder>::expr_into_dest
  26:     0x7f3a27b06d05 - <rustc_mir_build[a392e445574d452]::build::Builder>::expr_into_dest
  27:     0x7f3a27dfe87e - rustc_mir_build[a392e445574d452]::build::mir_build::{closure#0}
  28:     0x7f3a27b019b0 - rustc_mir_build[a392e445574d452]::build::mir_built
  29:     0x7f3a27b01633 - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>
  30:     0x7f3a27affd39 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::VecCache<rustc_span[79961d1f3d44db5f]::def_id::LocalDefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  31:     0x7f3a27aff910 - rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7f3a27732b30 - rustc_mir_transform[a66e1bf0036969f9]::ffi_unwind_calls::has_ffi_unwind_calls
  33:     0x7f3a2773269d - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::has_ffi_unwind_calls::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 1usize]>>
  34:     0x7f3a27a51007 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::VecCache<rustc_span[79961d1f3d44db5f]::def_id::LocalDefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  35:     0x7f3a27a50c03 - rustc_query_impl[aafdc9ab48500bbf]::query_impl::has_ffi_unwind_calls::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f3a27a02c83 - rustc_mir_transform[a66e1bf0036969f9]::mir_const
  37:     0x7f3a27a02baf - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_const::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>
  38:     0x7f3a27affd39 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::VecCache<rustc_span[79961d1f3d44db5f]::def_id::LocalDefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  39:     0x7f3a27aff850 - rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_const::get_query_non_incr::__rust_end_short_backtrace
  40:     0x7f3a2587a5e2 - rustc_mir_transform[a66e1bf0036969f9]::mir_promoted
  41:     0x7f3a27b732e0 - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 16usize]>>
  42:     0x7f3a27b735aa - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::VecCache<rustc_span[79961d1f3d44db5f]::def_id::LocalDefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  43:     0x7f3a284e3853 - rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  44:     0x7f3a284e3970 - rustc_borrowck[df3a95fa1272e840]::mir_borrowck
  45:     0x7f3a284e3899 - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>
  46:     0x7f3a27affd39 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::VecCache<rustc_span[79961d1f3d44db5f]::def_id::LocalDefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  47:     0x7f3a27aff794 - rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  48:     0x7f3a281f3fc9 - <rustc_borrowck[df3a95fa1272e840]::type_check::TypeChecker>::prove_closure_bounds
  49:     0x7f3a284a10ae - <rustc_borrowck[df3a95fa1272e840]::type_check::TypeChecker>::typeck_mir
  50:     0x7f3a252e86d1 - rustc_borrowck[df3a95fa1272e840]::type_check::type_check
  51:     0x7f3a252ccc09 - rustc_borrowck[df3a95fa1272e840]::nll::compute_regions
  52:     0x7f3a284f3b97 - rustc_borrowck[df3a95fa1272e840]::do_mir_borrowck
  53:     0x7f3a284e3e51 - rustc_borrowck[df3a95fa1272e840]::mir_borrowck
  54:     0x7f3a284e3899 - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>
  55:     0x7f3a27affd39 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::VecCache<rustc_span[79961d1f3d44db5f]::def_id::LocalDefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  56:     0x7f3a27aff794 - rustc_query_impl[aafdc9ab48500bbf]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  57:     0x7f3a28ad1259 - rustc_middle[d060b801b30d0b16]::query::plumbing::query_get_at::<rustc_query_system[5609ae2ca0b8284d]::query::caches::VecCache<rustc_span[79961d1f3d44db5f]::def_id::LocalDefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>>.llvm.9191639156879714653.cold.0
  58:     0x7f3a2649dfbd - <rustc_hir_analysis[c481e10dc51c4446]::collect::type_of::opaque::TaitConstraintLocator>::check
  59:     0x7f3a2648bf20 - <rustc_hir_analysis[c481e10dc51c4446]::collect::type_of::opaque::TaitConstraintLocator as rustc_hir[a3b1848d05e218a2]::intravisit::Visitor>::visit_item
  60:     0x7f3a286098fc - rustc_hir_analysis[c481e10dc51c4446]::collect::type_of::type_of_opaque
  61:     0x7f3a28608e5b - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>
  62:     0x7f3a2765ef54 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::DefaultCache<rustc_span[79961d1f3d44db5f]::def_id::DefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  63:     0x7f3a2864321e - rustc_query_impl[aafdc9ab48500bbf]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
  64:     0x7f3a2765dbae - rustc_middle[d060b801b30d0b16]::query::plumbing::query_get_at::<rustc_query_system[5609ae2ca0b8284d]::query::caches::DefaultCache<rustc_span[79961d1f3d44db5f]::def_id::DefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>>
  65:     0x7f3a258a3678 - rustc_hir_analysis[c481e10dc51c4446]::collect::type_of::type_of
  66:     0x7f3a276600be - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>
  67:     0x7f3a2765ef54 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::DefaultCache<rustc_span[79961d1f3d44db5f]::def_id::DefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  68:     0x7f3a2765eb1d - rustc_query_impl[aafdc9ab48500bbf]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  69:     0x7f3a2765dbae - rustc_middle[d060b801b30d0b16]::query::plumbing::query_get_at::<rustc_query_system[5609ae2ca0b8284d]::query::caches::DefaultCache<rustc_span[79961d1f3d44db5f]::def_id::DefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 8usize]>>>
  70:     0x7f3a28144033 - rustc_hir_analysis[c481e10dc51c4446]::check::check::check_item_type
  71:     0x7f3a27d9d0d9 - rustc_hir_analysis[c481e10dc51c4446]::check::wfcheck::check_well_formed
  72:     0x7f3a27d9bf73 - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 1usize]>>
  73:     0x7f3a27d9b671 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::VecCache<rustc_hir[a3b1848d05e218a2]::hir_id::OwnerId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  74:     0x7f3a27d9b3db - rustc_query_impl[aafdc9ab48500bbf]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  75:     0x7f3a27d98d77 - rustc_hir_analysis[c481e10dc51c4446]::check::wfcheck::check_mod_type_wf
  76:     0x7f3a27d98cbb - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 1usize]>>
  77:     0x7f3a27d97e7b - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::DefaultCache<rustc_span[79961d1f3d44db5f]::def_id::LocalModDefId, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  78:     0x7f3a27d97c09 - rustc_query_impl[aafdc9ab48500bbf]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  79:     0x7f3a27d97b1a - <rustc_middle[d060b801b30d0b16]::hir::map::Map>::try_par_for_each_module::<rustc_hir_analysis[c481e10dc51c4446]::check_crate::{closure#4}::{closure#0}>::{closure#0}
  80:     0x7f3a27afd9dc - rustc_hir_analysis[c481e10dc51c4446]::check_crate
  81:     0x7f3a28037559 - rustc_interface[82b52b903971ad5b]::passes::analysis
  82:     0x7f3a2803719f - rustc_query_impl[aafdc9ab48500bbf]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[aafdc9ab48500bbf]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 1usize]>>
  83:     0x7f3a285c3824 - rustc_query_system[5609ae2ca0b8284d]::query::plumbing::try_execute_query::<rustc_query_impl[aafdc9ab48500bbf]::DynamicConfig<rustc_query_system[5609ae2ca0b8284d]::query::caches::SingleCache<rustc_middle[d060b801b30d0b16]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[aafdc9ab48500bbf]::plumbing::QueryCtxt, false>
  84:     0x7f3a285c3615 - rustc_query_impl[aafdc9ab48500bbf]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  85:     0x7f3a2835d708 - rustc_interface[82b52b903971ad5b]::interface::run_compiler::<core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>, rustc_driver_impl[54e7dbd11c712533]::run_compiler::{closure#0}>::{closure#0}
  86:     0x7f3a285e8fc6 - std[6b9fb5ba93d727e9]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[82b52b903971ad5b]::util::run_in_thread_with_globals<rustc_interface[82b52b903971ad5b]::util::run_in_thread_pool_with_globals<rustc_interface[82b52b903971ad5b]::interface::run_compiler<core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>, rustc_driver_impl[54e7dbd11c712533]::run_compiler::{closure#0}>::{closure#0}, core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>>::{closure#0}, core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>>
  87:     0x7f3a285e8df3 - <<std[6b9fb5ba93d727e9]::thread::Builder>::spawn_unchecked_<rustc_interface[82b52b903971ad5b]::util::run_in_thread_with_globals<rustc_interface[82b52b903971ad5b]::util::run_in_thread_pool_with_globals<rustc_interface[82b52b903971ad5b]::interface::run_compiler<core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>, rustc_driver_impl[54e7dbd11c712533]::run_compiler::{closure#0}>::{closure#0}, core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>>::{closure#0}, core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ea75208d289faa44]::result::Result<(), rustc_span[79961d1f3d44db5f]::ErrorGuaranteed>>::{closure#1} as core[ea75208d289faa44]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  88:     0x7f3a235999d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h646d8cfdd583ca20
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/alloc/src/boxed.rs:2016:9
  89:     0x7f3a235999d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h79a5366d4b935d3e
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/alloc/src/boxed.rs:2016:9
  90:     0x7f3a235999d5 - std::sys::unix::thread::Thread::new::thread_start::h1e5e13c4b7d7a988
                               at /rustc/ae9d24de80b00b4158d1a29a212a6b02aeda0e75/library/std/src/sys/unix/thread.rs:108:17
  91:     0x7f3a233859eb - <unknown>
  92:     0x7f3a234097cc - <unknown>
  93:                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 1.77.0-nightly (ae9d24de8 2024-01-09) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z dump-mir-dir=dir

query stack during panic:
#0 [mir_built] building MIR for `enum_upvar::{closure#0}`
#1 [has_ffi_unwind_calls] checking if `enum_upvar::{closure#0}` contains FFI-unwind calls
#2 [mir_const] preparing `enum_upvar::{closure#0}` for borrow checking
#3 [mir_promoted] promoting constants in MIR for `enum_upvar::{closure#0}`
#4 [mir_borrowck] borrow-checking `enum_upvar::{closure#0}`
#5 [mir_borrowck] borrow-checking `enum_upvar`
#6 [type_of_opaque] computing type of opaque `enum_upvar::T::{opaque#0}`
#7 [type_of] computing type of `enum_upvar::T::{opaque#0}`
#8 [check_well_formed] checking that `enum_upvar::T::{opaque#0}` is well-formed
#9 [check_mod_type_wf] checking that types are well-formed in top-level module
#10 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors; 1 warning emitted

Some errors have detailed explanations: E0601, E0658.
For more information about an error, try `rustc --explain E0601`.

Contributor guide

Open the contributing guide

First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the ICE with the supplied ice.rs snippet and rustc --edition=2021, then inspect compiler/rustc_mir_build/src/build/expr/as_place.rs around line 253 and the MIR match-building path shown in the backtrace. Done means this input no longer causes rustc to panic, with regression coverage for the case.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
42/100

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