Closed
Description
auto-reduced (treereduce-rust):
#![feature(lifetime_capture_rules_2024)]
struct FileSystem;
impl FileSystem {
fn build<'a>(&mut self, commands: impl Iterator + 'a) -> Option<impl Iterator + 'a> {
let further_commands = self.build(commands);
self.build(further_commands?)
}
}
original:
struct FileSystem;
impl FileSystem {
fn build<'a>(
&mut self,
commands: impl Iterator<Item = &'a str> + 'a,
) -> Option<impl Iterator<Item = &'a str> + 'a> {
let further_commands = self.build(commands);
self.build(further_commands?)
}
}
fn main() {}Version information
rustc 1.79.0-nightly (a128516cf 2024-03-20)
binary: rustc
commit-hash: a128516cf9de352ae1f9d430ed730363c7ca3c0c
commit-date: 2024-03-20
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.2
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zcrate-attr=feature(lifetime_capture_rules_2024)
Program output
error[E0601]: `main` function not found in crate `mvce`
--> /tmp/icemaker_global_tempdir.5DyaYG8WNdcy/rustc_testrunner_tmpdir_reporting.vVpwcwBvw9uo/mvce.rs:8:2
|
8 | }
| ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.5DyaYG8WNdcy/rustc_testrunner_tmpdir_reporting.vVpwcwBvw9uo/mvce.rs`
warning: function cannot return without recursing
--> /tmp/icemaker_global_tempdir.5DyaYG8WNdcy/rustc_testrunner_tmpdir_reporting.vVpwcwBvw9uo/mvce.rs:4:5
|
4 | fn build<'a>(&mut self, commands: impl Iterator + 'a) -> Option<impl Iterator + 'a> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
5 | let further_commands = self.build(commands);
| -------------------- recursive call site
|
= help: a `loop` may express intention better if this is on purpose
= note: `#[warn(unconditional_recursion)]` on by default
thread 'rustc' panicked at compiler/rustc_borrowck/src/region_infer/opaque_types.rs:73:54:
called `Option::unwrap()` on a `None` value
stack backtrace:
0: 0x753296040fa5 - std::backtrace_rs::backtrace::libunwind::trace::hb238178a600e7640
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
1: 0x753296040fa5 - std::backtrace_rs::backtrace::trace_unsynchronized::h18a64faf849956d4
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x753296040fa5 - std::sys_common::backtrace::_print_fmt::hdae976156d449368
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/sys_common/backtrace.rs:68:5
3: 0x753296040fa5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hdb9b5e3e983ce460
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/sys_common/backtrace.rs:44:22
4: 0x753296091feb - core::fmt::rt::Argument::fmt::h5ad447117290599a
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/core/src/fmt/rt.rs:142:9
5: 0x753296091feb - core::fmt::write::hcec2d8528418f27e
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/core/src/fmt/mod.rs:1153:17
6: 0x753296035cbf - std::io::Write::write_fmt::haa636139e96e53ba
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/io/mod.rs:1843:15
7: 0x753296040d7e - std::sys_common::backtrace::_print::hdbf81feba9c817a4
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/sys_common/backtrace.rs:47:5
8: 0x753296040d7e - std::sys_common::backtrace::print::h112b76c74c4834e6
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/sys_common/backtrace.rs:34:9
9: 0x7532960439f9 - std::panicking::default_hook::{{closure}}::hc5e53ea3fc429948
10: 0x753296043763 - std::panicking::default_hook::hf72e5bd4be2b44da
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/panicking.rs:292:9
11: 0x753292bbd84e - std[a5db6e0d1910bc78]::panicking::update_hook::<alloc[18bd171651bd487c]::boxed::Box<rustc_driver_impl[97baef311a2c4da5]::install_ice_hook::{closure#0}>>::{closure#0}
12: 0x753296044150 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h3f12fab570b3bdb9
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/alloc/src/boxed.rs:2029:9
13: 0x753296044150 - std::panicking::rust_panic_with_hook::h87df935cb16f0257
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/panicking.rs:783:13
14: 0x753296043e6d - std::panicking::begin_panic_handler::{{closure}}::h8437e08ccc24881f
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/panicking.rs:649:13
15: 0x753296041469 - std::sys_common::backtrace::__rust_end_short_backtrace::h3ca2dfcfb7935be2
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/sys_common/backtrace.rs:171:18
16: 0x753296043bd7 - rust_begin_unwind
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/panicking.rs:645:5
17: 0x75329608e486 - core::panicking::panic_fmt::hb044fd902962ba9f
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/core/src/panicking.rs:72:14
18: 0x75329608e52f - core::panicking::panic::h81980bd19ca17c53
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/core/src/panicking.rs:141:5
19: 0x75329608e229 - core::option::unwrap_failed::h058372a1f2d8fc7f
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/core/src/option.rs:1985:5
20: 0x75329173df12 - rustc_borrowck[aed012f9190e468d]::nll::compute_regions
21: 0x753294dcd306 - rustc_borrowck[aed012f9190e468d]::do_mir_borrowck
22: 0x753294107ce8 - rustc_borrowck[aed012f9190e468d]::mir_borrowck
23: 0x7532941077d7 - rustc_query_impl[d6f091b6e43d27d5]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d6f091b6e43d27d5]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>
24: 0x7532941097ee - rustc_query_system[b807d52738406a3e]::query::plumbing::try_execute_query::<rustc_query_impl[d6f091b6e43d27d5]::DynamicConfig<rustc_query_system[b807d52738406a3e]::query::caches::VecCache<rustc_span[124ba900a2a510f4]::def_id::LocalDefId, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d6f091b6e43d27d5]::plumbing::QueryCtxt, false>
25: 0x75329410930c - rustc_query_impl[d6f091b6e43d27d5]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
26: 0x75329487c1cb - rustc_middle[798b1e6edaf341c7]::query::plumbing::query_get_at::<rustc_query_system[b807d52738406a3e]::query::caches::VecCache<rustc_span[124ba900a2a510f4]::def_id::LocalDefId, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>>
27: 0x7532948740ad - rustc_hir_analysis[423f0ab376009544]::collect::type_of::type_of_opaque
28: 0x753294873f37 - rustc_query_impl[d6f091b6e43d27d5]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d6f091b6e43d27d5]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>
29: 0x753293ef5b59 - rustc_query_system[b807d52738406a3e]::query::plumbing::try_execute_query::<rustc_query_impl[d6f091b6e43d27d5]::DynamicConfig<rustc_query_system[b807d52738406a3e]::query::caches::DefIdCache<rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d6f091b6e43d27d5]::plumbing::QueryCtxt, false>
30: 0x753294da71de - rustc_query_impl[d6f091b6e43d27d5]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
31: 0x7532944eb696 - rustc_middle[798b1e6edaf341c7]::query::plumbing::query_get_at::<rustc_query_system[b807d52738406a3e]::query::caches::DefIdCache<rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>>
32: 0x753291c5ce3a - rustc_hir_analysis[423f0ab376009544]::collect::type_of::type_of
33: 0x753293ef6f22 - rustc_query_impl[d6f091b6e43d27d5]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d6f091b6e43d27d5]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>
34: 0x753293ef5b59 - rustc_query_system[b807d52738406a3e]::query::plumbing::try_execute_query::<rustc_query_impl[d6f091b6e43d27d5]::DynamicConfig<rustc_query_system[b807d52738406a3e]::query::caches::DefIdCache<rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d6f091b6e43d27d5]::plumbing::QueryCtxt, false>
35: 0x753293ef565b - rustc_query_impl[d6f091b6e43d27d5]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
36: 0x7532944eb696 - rustc_middle[798b1e6edaf341c7]::query::plumbing::query_get_at::<rustc_query_system[b807d52738406a3e]::query::caches::DefIdCache<rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 8usize]>>>
37: 0x7532944f1873 - rustc_hir_analysis[423f0ab376009544]::check::check::check_item_type
38: 0x753294517bd2 - rustc_hir_analysis[423f0ab376009544]::check::wfcheck::check_well_formed
39: 0x7532945166b5 - rustc_query_impl[d6f091b6e43d27d5]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d6f091b6e43d27d5]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 1usize]>>
40: 0x753294515e40 - rustc_query_system[b807d52738406a3e]::query::plumbing::try_execute_query::<rustc_query_impl[d6f091b6e43d27d5]::DynamicConfig<rustc_query_system[b807d52738406a3e]::query::caches::VecCache<rustc_hir[37495ea4fccba01b]::hir_id::OwnerId, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[d6f091b6e43d27d5]::plumbing::QueryCtxt, false>
41: 0x753294515bbf - rustc_query_impl[d6f091b6e43d27d5]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
42: 0x753294513afa - rustc_hir_analysis[423f0ab376009544]::check::wfcheck::check_mod_type_wf
43: 0x753294513921 - rustc_query_impl[d6f091b6e43d27d5]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d6f091b6e43d27d5]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 1usize]>>
44: 0x7532948e7c70 - rustc_query_system[b807d52738406a3e]::query::plumbing::try_execute_query::<rustc_query_impl[d6f091b6e43d27d5]::DynamicConfig<rustc_query_system[b807d52738406a3e]::query::caches::DefaultCache<rustc_span[124ba900a2a510f4]::def_id::LocalModDefId, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[d6f091b6e43d27d5]::plumbing::QueryCtxt, false>
45: 0x7532948e7a1b - rustc_query_impl[d6f091b6e43d27d5]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
46: 0x753294104f0b - rustc_hir_analysis[423f0ab376009544]::check_crate
47: 0x7532942a226a - rustc_interface[b2729804a80bd186]::passes::analysis
48: 0x7532942a1dd9 - rustc_query_impl[d6f091b6e43d27d5]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d6f091b6e43d27d5]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 1usize]>>
49: 0x753294c3c8c3 - rustc_query_system[b807d52738406a3e]::query::plumbing::try_execute_query::<rustc_query_impl[d6f091b6e43d27d5]::DynamicConfig<rustc_query_system[b807d52738406a3e]::query::caches::SingleCache<rustc_middle[798b1e6edaf341c7]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[d6f091b6e43d27d5]::plumbing::QueryCtxt, false>
50: 0x753294c3c63f - rustc_query_impl[d6f091b6e43d27d5]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
51: 0x753294a8d684 - rustc_interface[b2729804a80bd186]::interface::run_compiler::<core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>, rustc_driver_impl[97baef311a2c4da5]::run_compiler::{closure#0}>::{closure#0}
52: 0x753294b97a05 - std[a5db6e0d1910bc78]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[b2729804a80bd186]::util::run_in_thread_with_globals<rustc_interface[b2729804a80bd186]::util::run_in_thread_pool_with_globals<rustc_interface[b2729804a80bd186]::interface::run_compiler<core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>, rustc_driver_impl[97baef311a2c4da5]::run_compiler::{closure#0}>::{closure#0}, core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>>::{closure#0}, core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>>
53: 0x753294b97832 - <<std[a5db6e0d1910bc78]::thread::Builder>::spawn_unchecked_<rustc_interface[b2729804a80bd186]::util::run_in_thread_with_globals<rustc_interface[b2729804a80bd186]::util::run_in_thread_pool_with_globals<rustc_interface[b2729804a80bd186]::interface::run_compiler<core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>, rustc_driver_impl[97baef311a2c4da5]::run_compiler::{closure#0}>::{closure#0}, core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>>::{closure#0}, core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[980ed62ddb44d8e4]::result::Result<(), rustc_span[124ba900a2a510f4]::ErrorGuaranteed>>::{closure#1} as core[980ed62ddb44d8e4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
54: 0x75329604d919 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hce41d8367d913790
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/alloc/src/boxed.rs:2015:9
55: 0x75329604d919 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2459e445e1bb3b38
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/alloc/src/boxed.rs:2015:9
56: 0x75329604d919 - std::sys::pal::unix::thread::Thread::new::thread_start::h51f8e470692041f5
at /rustc/a128516cf9de352ae1f9d430ed730363c7ca3c0c/library/std/src/sys/pal/unix/thread.rs:108:17
57: 0x75328faa955a - <unknown>
58: 0x75328fb26a3c - <unknown>
59: 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 1.79.0-nightly (a128516cf 2024-03-20) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z crate-attr=feature(lifetime_capture_rules_2024) -Z dump-mir-dir=dir
query stack during panic:
#0 [mir_borrowck] borrow-checking `<impl at /tmp/icemaker_global_tempdir.5DyaYG8WNdcy/rustc_testrunner_tmpdir_reporting.vVpwcwBvw9uo/mvce.rs:3:1: 3:16>::build`
#1 [type_of_opaque] computing type of opaque `<impl at /tmp/icemaker_global_tempdir.5DyaYG8WNdcy/rustc_testrunner_tmpdir_reporting.vVpwcwBvw9uo/mvce.rs:3:1: 3:16>::build::{opaque#0}`
#2 [type_of] computing type of `<impl at /tmp/icemaker_global_tempdir.5DyaYG8WNdcy/rustc_testrunner_tmpdir_reporting.vVpwcwBvw9uo/mvce.rs:3:1: 3:16>::build::{opaque#0}`
#3 [check_well_formed] checking that `<impl at /tmp/icemaker_global_tempdir.5DyaYG8WNdcy/rustc_testrunner_tmpdir_reporting.vVpwcwBvw9uo/mvce.rs:3:1: 3:16>::build::{opaque#0}` is well-formed
#4 [check_mod_type_wf] checking that types are well-formed in top-level module
#5 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 1 previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0601`.