Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

ice: broken mir with never_patterns #120421

Closed
matthiaskrgr opened this issue Jan 27, 2024 · 3 comments
Closed

ice: broken mir with never_patterns #120421

matthiaskrgr opened this issue Jan 27, 2024 · 3 comments
Assignees
@Nadrieril
Labels
A-mir Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. F-never_patterns `#![feature(never_patterns)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

Comments

@matthiaskrgr
Copy link
Member

auto-reduced (treereduce-rust):

#![feature(never_patterns)]

enum Void {}

fn main() {
    let res_void: Result<bool, Void> = Ok(true);

    for (Ok(mut _x) | Err(!)) in [res_void] {}
}

original:

// revisions: normal exh_pats
//[normal] check-pass
#![feature(never_patterns)]
#![allow(incomplete_features)]
#![cfg_attr(exh_pats, feature(exhaustive_patterns))]
#![allow(dead_code, unreachable_code)]
#![cfg_attr(exh_pats, feature(exhaustive_patterns))]

#[derive(Copy, Clone)]
enum Void {}

fn main() {
    let res_void: Result<bool, Void> = Ok(true);

    match res_void {
        Ok(_x) => {}
        Err(!),
        //[exh_pats]~^ ERROR unreachable
    }
    let (Ok(_x) | Err(!)) = res_void;
    //[exh_pats]~^ ERROR unreachable
    if let Err(!) = res_void {}
    //[exh_pats]~^ ERROR unreachable
    if let (Ok(true) | Err(!)) = res_void {}
    //[exh_pats]~^ ERROR unreachable
    for (Ok(mut _x) | Err(!)) in [res_void] {}
    //[exh_pats]~^ ERROR unreachable
}

fn foo((Ok(_x) | Err(!)): Result<bool, Void>) {}
//[exh_pats]~^ ERROR unreachable

Version information

rustc 1.77.0-nightly (8b6a431b3 2024-01-27)
binary: rustc
commit-hash: 8b6a431b3d3066a54dffc7f16bf658cf5690efc9
commit-date: 2024-01-27
host: x86_64-unknown-linux-gnu
release: 1.77.0-nightly
LLVM version: 17.0.6

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zlint-mir

Program output 

warning: the feature `never_patterns` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:1:12
  |
1 | #![feature(never_patterns)]
  |            ^^^^^^^^^^^^^^
  |
  = note: see issue #118155 <https://github.com/rust-lang/rust/issues/118155> for more information
  = note: `#[warn(incomplete_features)]` on by default

warning: unnecessary parentheses around pattern
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:8:9
  |
8 |     for (Ok(mut _x) | Err(!)) in [res_void] {}
  |         ^                   ^
  |
  = note: `#[warn(unused_parens)]` on by default
help: remove these parentheses
  |
8 -     for (Ok(mut _x) | Err(!)) in [res_void] {}
8 +     for Ok(mut _x) | Err(!) in [res_void] {}
  |

note: no errors encountered even though `span_delayed_bug` issued

note: those delayed bugs will now be shown as internal compiler errors

error: internal compiler error: broken MIR in Item(DefId(0:4 ~ mvce[fcbc]::main)) (after pass CheckPackedRef) at bb14[0]:
                                StorageLive(_14) which already has storage here
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:8:13
  |
8 |     for (Ok(mut _x) | Err(!)) in [res_void] {}
  |             ^^^^^^
  |
note: delayed at compiler/rustc_mir_transform/src/lint.rs:97:26
         0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
         1: <rustc_errors::DiagCtxt>::emit_diagnostic
         2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
         3: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
         4: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_statement
         5: rustc_mir_transform::lint::lint_body
         6: rustc_mir_transform::mir_const
         7: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_const::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
         8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         9: rustc_query_impl::query_impl::mir_const::get_query_non_incr::__rust_end_short_backtrace
        10: rustc_mir_transform::mir_promoted
        11: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>>
        12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        13: rustc_query_impl::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
        14: rustc_borrowck::mir_borrowck
        15: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
        16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        17: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
        18: rustc_interface::passes::analysis
        19: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        20: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        21: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        22: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
        23: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        24: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        25: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        26: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        27: std::sys::pal::unix::thread::Thread::new::thread_start
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/std/src/sys/pal/unix/thread.rs:108:17
        28: <unknown>
        29: <unknown>
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:8:13
  |
8 |     for (Ok(mut _x) | Err(!)) in [res_void] {}
  |             ^^^^^^

error: internal compiler error: broken MIR in Item(DefId(0:4 ~ mvce[fcbc]::main)) (after pass CheckPackedRef) at bb19[2]:
                                local _14 still has storage when returning from function
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:9:2
  |
9 | }
  |  ^
  |
note: delayed at compiler/rustc_mir_transform/src/lint.rs:116:34
         0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
         1: <rustc_errors::DiagCtxt>::emit_diagnostic
         2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
         3: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
         4: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
         5: rustc_mir_transform::lint::lint_body
         6: rustc_mir_transform::mir_const
         7: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_const::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
         8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         9: rustc_query_impl::query_impl::mir_const::get_query_non_incr::__rust_end_short_backtrace
        10: rustc_mir_transform::mir_promoted
        11: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>>
        12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        13: rustc_query_impl::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
        14: rustc_borrowck::mir_borrowck
        15: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
        16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        17: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
        18: rustc_interface::passes::analysis
        19: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        20: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        21: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        22: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
        23: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        24: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        25: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        26: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        27: std::sys::pal::unix::thread::Thread::new::thread_start
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/std/src/sys/pal/unix/thread.rs:108:17
        28: <unknown>
        29: <unknown>
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:9:2
  |
9 | }
  |  ^

error: internal compiler error: broken MIR in Item(DefId(0:4 ~ mvce[fcbc]::main)) (after pass CheckConstItemMutation) at bb14[0]:
                                StorageLive(_14) which already has storage here
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:8:13
  |
8 |     for (Ok(mut _x) | Err(!)) in [res_void] {}
  |             ^^^^^^
  |
note: delayed at compiler/rustc_mir_transform/src/lint.rs:97:26
         0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
         1: <rustc_errors::DiagCtxt>::emit_diagnostic
         2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
         3: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
         4: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_statement
         5: rustc_mir_transform::lint::lint_body
         6: rustc_mir_transform::mir_const
         7: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_const::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
         8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         9: rustc_query_impl::query_impl::mir_const::get_query_non_incr::__rust_end_short_backtrace
        10: rustc_mir_transform::mir_promoted
        11: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>>
        12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        13: rustc_query_impl::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
        14: rustc_borrowck::mir_borrowck
        15: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
        16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        17: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
        18: rustc_interface::passes::analysis
        19: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        20: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        21: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        22: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
        23: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        24: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        25: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        26: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        27: std::sys::pal::unix::thread::Thread::new::thread_start
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/std/src/sys/pal/unix/thread.rs:108:17
        28: <unknown>
        29: <unknown>
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:8:13
  |
8 |     for (Ok(mut _x) | Err(!)) in [res_void] {}
  |             ^^^^^^

error: internal compiler error: broken MIR in Item(DefId(0:4 ~ mvce[fcbc]::main)) (after pass CheckConstItemMutation) at bb19[2]:
                                local _14 still has storage when returning from function
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:9:2
  |
9 | }
  |  ^
  |
note: delayed at compiler/rustc_mir_transform/src/lint.rs:116:34
         0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
         1: <rustc_errors::DiagCtxt>::emit_diagnostic
         2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
         3: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
         4: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
         5: rustc_mir_transform::lint::lint_body
         6: rustc_mir_transform::mir_const
         7: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_const::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
         8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         9: rustc_query_impl::query_impl::mir_const::get_query_non_incr::__rust_end_short_backtrace
        10: rustc_mir_transform::mir_promoted
        11: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>>
        12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        13: rustc_query_impl::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
        14: rustc_borrowck::mir_borrowck
        15: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
        16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        17: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
        18: rustc_interface::passes::analysis
        19: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        20: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        21: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        22: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
        23: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        24: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        25: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        26: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        27: std::sys::pal::unix::thread::Thread::new::thread_start
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/std/src/sys/pal/unix/thread.rs:108:17
        28: <unknown>
        29: <unknown>
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:9:2
  |
9 | }
  |  ^

error: internal compiler error: broken MIR in Item(DefId(0:4 ~ mvce[fcbc]::main)) (after pass FunctionItemReferences) at bb14[0]:
                                StorageLive(_14) which already has storage here
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:8:13
  |
8 |     for (Ok(mut _x) | Err(!)) in [res_void] {}
  |             ^^^^^^
  |
note: delayed at compiler/rustc_mir_transform/src/lint.rs:97:26
         0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
         1: <rustc_errors::DiagCtxt>::emit_diagnostic
         2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
         3: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
         4: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_statement
         5: rustc_mir_transform::lint::lint_body
         6: rustc_mir_transform::mir_const
         7: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_const::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
         8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         9: rustc_query_impl::query_impl::mir_const::get_query_non_incr::__rust_end_short_backtrace
        10: rustc_mir_transform::mir_promoted
        11: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>>
        12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        13: rustc_query_impl::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
        14: rustc_borrowck::mir_borrowck
        15: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
        16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        17: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
        18: rustc_interface::passes::analysis
        19: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        20: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        21: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        22: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
        23: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        24: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        25: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        26: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/alloc/src/boxed.rs:2015:9
        27: std::sys::pal::unix::thread::Thread::new::thread_start
                   at /rustc/8b6a431b3d3066a54dffc7f16bf658cf5690efc9/library/std/src/sys/pal/unix/thread.rs:108:17
        28: <unknown>
        29: <unknown>
 --> /tmp/icemaker_global_tempdir.DcgwEtL6OYqo/rustc_testrunner_tmpdir_reporting.TtsI0a2Vt7Zf/mvce.rs:8:13
  |
8 |     for (Ok(mut _x) | Err(!)) in [res_void] {}
  |             ^^^^^^

<snip>

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 (8b6a431b3 2024-01-27) running on x86_64-unknown-linux-gnu

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

query stack during panic:
end of query stack
error: aborting due to 54 previous errors; 2 warnings emitted

@matthiaskrgr matthiaskrgr added I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. F-never_patterns `#![feature(never_patterns)]` labels Jan 27, 2024
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Jan 27, 2024
@matthiaskrgr
Copy link
Member Author

#119610 cc @Nadrieril

@Nadrieril
Copy link
Member

Nadrieril commented Jan 27, 2024 •
edited

Ah yeah, I think it's because I lower ! like a wildcard, so _x doesn't get bound in the Err branch. Something along these lines. Unfortunate that it ICEs with the feature off (EDIT: misread)

@Nadrieril Nadrieril self-assigned this Jan 27, 2024
@tmiasko tmiasko added A-mir Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html and removed needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. labels Jan 27, 2024
@Naserume Naserume mentioned this issue Mar 22, 2024
Open
@matthiaskrgr matthiaskrgr added the S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. label Apr 18, 2024
@Nadrieril
Copy link
Member

Fixed in #123332

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees

@Nadrieril Nadrieril

Labels
A-mir Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. F-never_patterns `#![feature(never_patterns)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
4 participants
@matthiaskrgr @Nadrieril @rustbot @tmiasko