Closed
Description
Code
#![crate_type = "lib"]
fn _y() {
vec![42].iter().map(drop);
}Meta
rustc --version --verbose:
rustc 1.70.0-nightly (22f247c6f 2023-03-13)
binary: rustc
commit-hash: 22f247c6f3ed388cb702d01c2ff27da658a8b353
commit-date: 2023-03-13
host: x86_64-unknown-linux-gnu
release: 1.70.0-nightly
LLVM version: 15.0.7
Error output
<output>
Backtrace
warning: unused `Map` that must be used
--> treereduce.out:3:5
|
3 | vec![42].iter().map(drop);
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: iterators are lazy and do nothing unless consumed
= note: `#[warn(unused_must_use)]` on by default
thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: "core"', compiler/rustc_lint/src/map_unit_fn.rs:67:78
stack backtrace:
0: 0x7f010976651a - std::backtrace_rs::backtrace::libunwind::trace::h1ac6254167c780d9
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x7f010976651a - std::backtrace_rs::backtrace::trace_unsynchronized::hec2af85915e24f36
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f010976651a - std::sys_common::backtrace::_print_fmt::h58a4e3535fcce206
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:65:5
3: 0x7f010976651a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5107e13758b8321c
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7f01097c9c5e - core::fmt::write::h2e851dc027730d81
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/core/src/fmt/mod.rs:1232:17
5: 0x7f0109759375 - std::io::Write::write_fmt::hca00074de9f85084
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/io/mod.rs:1684:15
6: 0x7f01097662e5 - std::sys_common::backtrace::_print::h870053c845cddf24
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:47:5
7: 0x7f01097662e5 - std::sys_common::backtrace::print::hb56add862f96c5fd
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:34:9
8: 0x7f010976905f - std::panicking::default_hook::{{closure}}::h636d4ba3ff8fdc46
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:271:22
9: 0x7f0109768d9b - std::panicking::default_hook::hf29b58145ee6e43c
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:290:9
10: 0x7f010ca580c5 - <rustc_driver_impl[74350ec99973fded]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[2011dc7817943e09]::ops::function::FnOnce<(&core[2011dc7817943e09]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
11: 0x7f010976989d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7342d57f33f6634f
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/alloc/src/boxed.rs:2002:9
12: 0x7f010976989d - std::panicking::rust_panic_with_hook::hbf9ef936d990c16f
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:696:13
13: 0x7f0109769619 - std::panicking::begin_panic_handler::{{closure}}::h6be6433dcb901f4b
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:583:13
14: 0x7f0109766986 - std::sys_common::backtrace::__rust_end_short_backtrace::h802b6104a4d80829
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys_common/backtrace.rs:150:18
15: 0x7f0109769322 - rust_begin_unwind
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/panicking.rs:579:5
16: 0x7f01097c5fb3 - core::panicking::panic_fmt::hf7a8a88b9669732e
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/core/src/panicking.rs:64:14
17: 0x7f01097c6543 - core::result::unwrap_failed::hcd86a721526c2121
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/core/src/result.rs:1750:5
18: 0x7f010b3b6c44 - <rustc_lint[c11cb6a8cfa5f7c9]::late::LateContextAndPass<rustc_lint[c11cb6a8cfa5f7c9]::BuiltinCombinedModuleLateLintPass> as rustc_hir[ca07edd3831bb6e2]::intravisit::Visitor>::visit_stmt
19: 0x7f010b3abe5e - <rustc_lint[c11cb6a8cfa5f7c9]::late::LateContextAndPass<rustc_lint[c11cb6a8cfa5f7c9]::BuiltinCombinedModuleLateLintPass> as rustc_hir[ca07edd3831bb6e2]::intravisit::Visitor>::visit_expr
20: 0x7f010b8b79ab - rustc_hir[ca07edd3831bb6e2]::intravisit::walk_fn::<rustc_lint[c11cb6a8cfa5f7c9]::late::LateContextAndPass<rustc_lint[c11cb6a8cfa5f7c9]::BuiltinCombinedModuleLateLintPass>>
21: 0x7f010b8afe63 - rustc_hir[ca07edd3831bb6e2]::intravisit::walk_item::<rustc_lint[c11cb6a8cfa5f7c9]::late::LateContextAndPass<rustc_lint[c11cb6a8cfa5f7c9]::BuiltinCombinedModuleLateLintPass>>
22: 0x7f010b8af599 - rustc_hir[ca07edd3831bb6e2]::intravisit::walk_mod::<rustc_lint[c11cb6a8cfa5f7c9]::late::LateContextAndPass<rustc_lint[c11cb6a8cfa5f7c9]::BuiltinCombinedModuleLateLintPass>>
23: 0x7f010b8aef13 - rustc_lint[c11cb6a8cfa5f7c9]::late::late_lint_mod::<rustc_lint[c11cb6a8cfa5f7c9]::BuiltinCombinedModuleLateLintPass>
24: 0x7f010b8aed0c - rustc_lint[c11cb6a8cfa5f7c9]::lint_mod
25: 0x7f010c0988ce - rustc_query_system[f881c7f40ee7dcf0]::query::plumbing::try_execute_query::<rustc_query_impl[eb95ff51c492efdd]::queries::lint_mod, rustc_query_impl[eb95ff51c492efdd]::plumbing::QueryCtxt>
26: 0x7f010c098453 - <rustc_query_impl[eb95ff51c492efdd]::Queries as rustc_middle[eaae5d2a0b8f0144]::ty::query::QueryEngine>::lint_mod
27: 0x7f010ae3dfe8 - rustc_data_structures[75b47a18491287a9]::sync::par_for_each_in::<&[rustc_hir[ca07edd3831bb6e2]::hir_id::OwnerId], <rustc_middle[eaae5d2a0b8f0144]::hir::map::Map>::par_for_each_module<rustc_lint[c11cb6a8cfa5f7c9]::late::check_crate<rustc_lint[c11cb6a8cfa5f7c9]::BuiltinCombinedLateLintPass, rustc_interface[ceda1fd77ec39e1b]::passes::analysis::{closure#6}::{closure#1}::{closure#2}::{closure#0}::{closure#0}>::{closure#1}::{closure#0}::{closure#0}>::{closure#0}>
28: 0x7f010ae3dd6e - <rustc_session[a360c2d099171c08]::session::Session>::time::<(), rustc_lint[c11cb6a8cfa5f7c9]::late::check_crate<rustc_lint[c11cb6a8cfa5f7c9]::BuiltinCombinedLateLintPass, rustc_interface[ceda1fd77ec39e1b]::passes::analysis::{closure#6}::{closure#1}::{closure#2}::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>
29: 0x7f010ae3d79f - <rustc_session[a360c2d099171c08]::session::Session>::time::<(), rustc_interface[ceda1fd77ec39e1b]::passes::analysis::{closure#6}::{closure#1}::{closure#2}::{closure#0}>
30: 0x7f010ae3d418 - <core[2011dc7817943e09]::panic::unwind_safe::AssertUnwindSafe<rustc_interface[ceda1fd77ec39e1b]::passes::analysis::{closure#6}::{closure#1}> as core[2011dc7817943e09]::ops::function::FnOnce<()>>::call_once
31: 0x7f010ae3ce53 - <rustc_session[a360c2d099171c08]::session::Session>::time::<(), rustc_interface[ceda1fd77ec39e1b]::passes::analysis::{closure#6}>
32: 0x7f010ae3b27a - rustc_interface[ceda1fd77ec39e1b]::passes::analysis
33: 0x7f010c276a4c - rustc_query_system[f881c7f40ee7dcf0]::query::plumbing::try_execute_query::<rustc_query_impl[eb95ff51c492efdd]::queries::analysis, rustc_query_impl[eb95ff51c492efdd]::plumbing::QueryCtxt>
34: 0x7f010c276740 - <rustc_query_impl[eb95ff51c492efdd]::Queries as rustc_middle[eaae5d2a0b8f0144]::ty::query::QueryEngine>::analysis
35: 0x7f010c09f789 - <rustc_middle[eaae5d2a0b8f0144]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[74350ec99973fded]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>
36: 0x7f010bc8ef08 - rustc_span[18b84908941c7cdf]::with_source_map::<core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>, rustc_interface[ceda1fd77ec39e1b]::interface::run_compiler<core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>, rustc_driver_impl[74350ec99973fded]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
37: 0x7f010bc8616c - std[1337fb43929788f1]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ceda1fd77ec39e1b]::util::run_in_thread_pool_with_globals<rustc_interface[ceda1fd77ec39e1b]::interface::run_compiler<core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>, rustc_driver_impl[74350ec99973fded]::run_compiler::{closure#1}>::{closure#0}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>
38: 0x7f010bc85b9a - <<std[1337fb43929788f1]::thread::Builder>::spawn_unchecked_<rustc_interface[ceda1fd77ec39e1b]::util::run_in_thread_pool_with_globals<rustc_interface[ceda1fd77ec39e1b]::interface::run_compiler<core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>, rustc_driver_impl[74350ec99973fded]::run_compiler::{closure#1}>::{closure#0}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2011dc7817943e09]::result::Result<(), rustc_span[18b84908941c7cdf]::ErrorGuaranteed>>::{closure#1} as core[2011dc7817943e09]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
39: 0x7f0109773793 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7e0474dd3b8659fa
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/alloc/src/boxed.rs:1988:9
40: 0x7f0109773793 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::heb8c41cf543a5c11
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/alloc/src/boxed.rs:1988:9
41: 0x7f0109773793 - std::sys::unix::thread::Thread::new::thread_start::hc791abe67253fe06
at /rustc/22f247c6f3ed388cb702d01c2ff27da658a8b353/library/std/src/sys/unix/thread.rs:108:17
42: 0x7f0109505bb5 - <unknown>
43: 0x7f0109587d90 - <unknown>
44: 0x0 - <unknown>
error: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: rustc 1.70.0-nightly (22f247c6f 2023-03-13) running on x86_64-unknown-linux-gnu
query stack during panic:
#0 [lint_mod] linting top-level module
#1 [analysis] running analysis passes on this crate
end of query stack
warning: 1 warning emitted