[ICE]: guard_patterns: local still has storage when returning from function
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C-bug
F-guard_patterns
I-ICE
S-bug-has-test
S-has-mcve
T-compiler
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- Rust
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Description
snippet:
//@compile-flags: -Zlint-mir
#![feature(guard_patterns)]
fn guard<T>(x: T) -> bool {
unimplemented!()
}
fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
fn main() {}
Version information
rustc 1.96.0-nightly (fff9e4432 2026-04-06)
binary: rustc
commit-hash: fff9e4432233df859e4fadb30ab7f0eda22580a6
commit-date: 2026-04-06
host: x86_64-unknown-linux-gnu
release: 1.96.0-nightly
LLVM version: 22.1.2
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zlint-mir
Program output
warning: the feature `guard_patterns` is incomplete and may not be safe to use and/or cause compiler crashes
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:1:12
|
1 | #![feature(guard_patterns)]
| ^^^^^^^^^^^^^^
|
= note: see issue #129967 <https://github.com/rust-lang/rust/issues/129967> for more information
= note: `#[warn(incomplete_features)]` on by default
warning: unused variable: `x`
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:3:13
|
3 | fn guard<T>(x: T) -> bool {
| ^ help: if this is intentional, prefix it with an underscore: `_x`
|
= note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
warning: unreachable pattern
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:29
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ------------------- ^^^^^^ no value can reach this
| |
| matches any value
|
= note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
warning: unused variable: `x`
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:33
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^ help: if this is intentional, prefix it with an underscore: `_x`
warning: function `guard` is never used
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:3:4
|
3 | fn guard<T>(x: T) -> bool {
| ^^^^^
|
= note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
warning: function `a` is never used
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:4
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
warning: 6 warnings emitted
note: no errors encountered even though delayed bugs were created
note: those delayed bugs will now be shown as internal compiler errors
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass CheckForceInline) at bb4[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_built
8: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
9: rustc_query_impl::query_impl::mir_built::execute_query_non_incr::__rust_end_short_backtrace
10: rustc_mir_build::check_unsafety::check_unsafety
11: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 0]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
12: rustc_query_impl::query_impl::check_unsafety::execute_query_non_incr::__rust_end_short_backtrace
13: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
14: rustc_interface::passes::analysis
15: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
16: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
18: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
19: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
20: <std::sys::thread::unix::Thread>::new::thread_start
21: <unknown>
22: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass CheckCallRecursion) at bb4[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_built
8: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
9: rustc_query_impl::query_impl::mir_built::execute_query_non_incr::__rust_end_short_backtrace
10: rustc_mir_build::check_unsafety::check_unsafety
11: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 0]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
12: rustc_query_impl::query_impl::check_unsafety::execute_query_non_incr::__rust_end_short_backtrace
13: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
14: rustc_interface::passes::analysis
15: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
16: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
18: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
19: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
20: <std::sys::thread::unix::Thread>::new::thread_start
21: <unknown>
22: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass CheckInlineAlwaysTargetFeature) at bb4[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_built
8: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
9: rustc_query_impl::query_impl::mir_built::execute_query_non_incr::__rust_end_short_backtrace
10: rustc_mir_build::check_unsafety::check_unsafety
11: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 0]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
12: rustc_query_impl::query_impl::check_unsafety::execute_query_non_incr::__rust_end_short_backtrace
13: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
14: rustc_interface::passes::analysis
15: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
16: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
18: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
19: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
20: <std::sys::thread::unix::Thread>::new::thread_start
21: <unknown>
22: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass CheckPackedRef) at bb4[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_built
8: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
9: rustc_query_impl::query_impl::mir_built::execute_query_non_incr::__rust_end_short_backtrace
10: rustc_mir_build::check_unsafety::check_unsafety
11: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 0]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
12: rustc_query_impl::query_impl::check_unsafety::execute_query_non_incr::__rust_end_short_backtrace
13: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
14: rustc_interface::passes::analysis
15: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
16: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
18: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
19: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
20: <std::sys::thread::unix::Thread>::new::thread_start
21: <unknown>
22: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass CheckConstItemMutation) at bb4[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_built
8: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
9: rustc_query_impl::query_impl::mir_built::execute_query_non_incr::__rust_end_short_backtrace
10: rustc_mir_build::check_unsafety::check_unsafety
11: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 0]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
12: rustc_query_impl::query_impl::check_unsafety::execute_query_non_incr::__rust_end_short_backtrace
13: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
14: rustc_interface::passes::analysis
15: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
16: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
18: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
19: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
20: <std::sys::thread::unix::Thread>::new::thread_start
21: <unknown>
22: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass FunctionItemReferences) at bb4[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_built
8: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
9: rustc_query_impl::query_impl::mir_built::execute_query_non_incr::__rust_end_short_backtrace
10: rustc_mir_build::check_unsafety::check_unsafety
11: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 0]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
12: rustc_query_impl::query_impl::check_unsafety::execute_query_non_incr::__rust_end_short_backtrace
13: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
14: rustc_interface::passes::analysis
15: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
16: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
18: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
19: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
20: <std::sys::thread::unix::Thread>::new::thread_start
21: <unknown>
22: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass SimplifyCfg-initial) at bb2[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_built
8: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
9: rustc_query_impl::query_impl::mir_built::execute_query_non_incr::__rust_end_short_backtrace
10: rustc_mir_build::check_unsafety::check_unsafety
11: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 0]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
12: rustc_query_impl::query_impl::check_unsafety::execute_query_non_incr::__rust_end_short_backtrace
13: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
14: rustc_interface::passes::analysis
15: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
16: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
18: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
19: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
20: <std::sys::thread::unix::Thread>::new::thread_start
21: <unknown>
22: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass SanityCheck) at bb2[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_built
8: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
9: rustc_query_impl::query_impl::mir_built::execute_query_non_incr::__rust_end_short_backtrace
10: rustc_mir_build::check_unsafety::check_unsafety
11: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 0]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
12: rustc_query_impl::query_impl::check_unsafety::execute_query_non_incr::__rust_end_short_backtrace
13: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
14: rustc_interface::passes::analysis
15: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
16: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
18: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
19: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
20: <std::sys::thread::unix::Thread>::new::thread_start
21: <unknown>
22: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass PromoteTemps) at bb2[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_promoted
8: rustc_query_impl::query_impl::mir_promoted::invoke_provider_fn::__rust_begin_short_backtrace
9: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 16]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
10: rustc_query_impl::query_impl::mir_promoted::execute_query_non_incr::__rust_end_short_backtrace
11: rustc_borrowck::mir_borrowck
12: rustc_query_impl::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
13: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
14: rustc_query_impl::query_impl::mir_borrowck::execute_query_non_incr::__rust_end_short_backtrace
15: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
16: rustc_interface::passes::analysis
17: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
18: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
19: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
20: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
21: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
22: <std::sys::thread::unix::Thread>::new::thread_start
23: <unknown>
24: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass SimplifyCfg-promote-consts) at bb2[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_promoted
8: rustc_query_impl::query_impl::mir_promoted::invoke_provider_fn::__rust_begin_short_backtrace
9: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 16]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
10: rustc_query_impl::query_impl::mir_promoted::execute_query_non_incr::__rust_end_short_backtrace
11: rustc_borrowck::mir_borrowck
12: rustc_query_impl::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
13: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
14: rustc_query_impl::query_impl::mir_borrowck::execute_query_non_incr::__rust_end_short_backtrace
15: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
16: rustc_interface::passes::analysis
17: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
18: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
19: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
20: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
21: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
22: <std::sys::thread::unix::Thread>::new::thread_start
23: <unknown>
24: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after phase change to analysis) at bb2[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::mir_promoted
8: rustc_query_impl::query_impl::mir_promoted::invoke_provider_fn::__rust_begin_short_backtrace
9: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 16]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
10: rustc_query_impl::query_impl::mir_promoted::execute_query_non_incr::__rust_end_short_backtrace
11: rustc_borrowck::mir_borrowck
12: rustc_query_impl::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
13: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
14: rustc_query_impl::query_impl::mir_borrowck::execute_query_non_incr::__rust_end_short_backtrace
15: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
16: rustc_interface::passes::analysis
17: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
18: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
19: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
20: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
21: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
22: <std::sys::thread::unix::Thread>::new::thread_start
23: <unknown>
24: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
error: internal compiler error: broken MIR in Item(DefId(0:5 ~ mvce[9c68]::a)) (after pass ImpossiblePredicates) at bb2[1]:
local _2 still has storage when returning from function
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
|
note: delayed at /rustc-dev/fff9e4432233df859e4fadb30ab7f0eda22580a6/compiler/rustc_mir_transform/src/lint.rs:137:34
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_mir_transform::lint::Lint>::fail::<alloc::string::String>
5: <rustc_mir_transform::lint::Lint as rustc_middle::mir::visit::Visitor>::visit_terminator
6: rustc_mir_transform::lint::lint_body
7: rustc_mir_transform::run_analysis_to_runtime_passes
8: rustc_mir_transform::mir_drops_elaborated_and_const_checked
9: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::invoke_provider_fn::__rust_begin_short_backtrace
10: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
11: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::execute_query_non_incr::__rust_end_short_backtrace
12: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
13: rustc_interface::passes::analysis
14: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::SingleCache<rustc_middle::query::erase::ErasedData<[u8; 0]>>, false>
15: rustc_query_impl::query_impl::analysis::execute_query_non_incr::__rust_end_short_backtrace
16: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
17: std::sys::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<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
18: <std::thread::lifecycle::spawn_unchecked<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
19: <std::sys::thread::unix::Thread>::new::thread_start
20: <unknown>
21: <unknown>
--> /tmp/icemaker_global_tempdir.gmqFyrERGYRw/rustc_testrunner_tmpdir_reporting.m0fw6nHOTPMw/mvce.rs:7:52
|
7 | fn a(((x if guard (x), _) | (_, x)): (i32, i32)) {}
| ^
note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: please make sure that you have updated to the latest nightly
note: rustc 1.96.0-nightly (fff9e4432 2026-04-06) 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
@rustbot label +F-guard_patterns
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the supplied guard_patterns example with rustc -Zlint-mir and inspect the broken MIR diagnostic, especially the lint path at compiler/rustc_mir_transform/src/lint.rs:137. Trace how the pattern is lowered and verify the example no longer reports that local storage remains at function return, adding a regression test if the surrounding test location is identified.
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
- 45/100