ICE: error was constructed but not emitted

[matthiaskrgr]

Code

#![feature(cfg_target_has_atomic, no_core, intrinsics, lang_items)]
#![crate_type="rlib"]
#![no_core]

extern "rust-intrinsic" {
    fn atomic_xadd<T>(dst: *mut T, src: T) -> T;
}

#[lang = "sized"]
trait Sized {}
#[lang = "copy"]
trait Copy {}

#[cfg(target_has_atomic = "8")]
pub unsafe fn atomic_u8(x: *mut u8) {
    atomic_xadd(x, 1);
    atomic_xadd(x, 1);
}

rustc 1.67.0-nightly (70f8737b2 2022-11-23) :

error[E0382]: use of moved value: `x`
  --> 023f2218b87ae7e7afaf853e5d953b53363da95e.rs:27:17
   |
25 | pub unsafe fn atomic_u8(x: *mut u8) {
   |                         - move occurs because `x` has type `*mut u8`, which does not implement the `Copy` trait
26 |     atomic_xadd(x, 1);
   |                 - value moved here
27 |     atomic_xadd(x, 1);
   |                 ^ value used here after move

error: aborting due to previous error

For more information about this error, try `rustc --explain E0382`.

rustc 1.67.0-nightly (5dfb4b0af 2022-11-24):

Backtrace

thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs:742:17
stack backtrace:
   0:     0x7f7a4d3662aa - std::backtrace_rs::backtrace::libunwind::trace::hb323b1c60fddca93
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f7a4d3662aa - std::backtrace_rs::backtrace::trace_unsynchronized::hc84e7bf61bca2c6e
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f7a4d3662aa - std::sys_common::backtrace::_print_fmt::h6d347369517c3499
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f7a4d3662aa - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha8becfe32371a83b
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f7a4d3c8bae - core::fmt::write::h49d04e24a4a0f5b0
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f7a4d3566e5 - std::io::Write::write_fmt::h51e3e9a867946d92
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/io/mod.rs:1682:15
   6:     0x7f7a4d366075 - std::sys_common::backtrace::_print::hdca39b4597f42be8
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f7a4d366075 - std::sys_common::backtrace::print::h90a45fec0894e48c
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f7a4d368d9f - std::panicking::default_hook::{{closure}}::h33ff658e7827f9cc
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:267:22
   9:     0x7f7a4d368adb - std::panicking::default_hook::h7b258e9d452b029f
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:286:9
  10:     0x7f7a4d3695bc - std::panicking::rust_panic_with_hook::hf8e2608dfe7b3876
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:688:13
  11:     0x7f7a4d369312 - std::panicking::begin_panic_handler::{{closure}}::hf08f8046f55d20d0
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:577:13
  12:     0x7f7a4d36675c - std::sys_common::backtrace::__rust_end_short_backtrace::h156042f7f0b912a5
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x7f7a4d369062 - rust_begin_unwind
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:575:5
  14:     0x7f7a4d3c55c3 - core::panicking::panic_fmt::h65ed150133999c5f
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/core/src/panicking.rs:65:14
  15:     0x7f7a4d3c569d - core::panicking::panic::h49fb44491f39587d
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/core/src/panicking.rs:114:5
  16:     0x7f7a504105e2 - <rustc_borrowck[294c6deda030de41]::MirBorrowckCtxt>::suggest_cloning
  17:     0x7f7a5040f389 - <rustc_borrowck[294c6deda030de41]::MirBorrowckCtxt>::report_use_of_moved_or_uninitialized
  18:     0x7f7a4ec6e3ea - <rustc_borrowck[294c6deda030de41]::MirBorrowckCtxt as rustc_mir_dataflow[ca8e193615b72aa8]::framework::visitor::ResultsVisitor>::visit_statement_before_primary_effect
  19:     0x7f7a4f753463 - rustc_mir_dataflow[ca8e193615b72aa8]::framework::visitor::visit_results::<rustc_borrowck[294c6deda030de41]::dataflow::BorrowckAnalyses<rustc_index[348215daae5de83b]::bit_set::BitSet<rustc_borrowck[294c6deda030de41]::dataflow::BorrowIndex>, rustc_index[348215daae5de83b]::bit_set::ChunkedBitSet<rustc_mir_dataflow[ca8e193615b72aa8]::move_paths::MovePathIndex>, rustc_index[348215daae5de83b]::bit_set::ChunkedBitSet<rustc_mir_dataflow[ca8e193615b72aa8]::move_paths::InitIndex>>, rustc_borrowck[294c6deda030de41]::dataflow::BorrowckAnalyses<rustc_mir_dataflow[ca8e193615b72aa8]::framework::engine::Results<rustc_borrowck[294c6deda030de41]::dataflow::Borrows>, rustc_mir_dataflow[ca8e193615b72aa8]::framework::engine::Results<rustc_mir_dataflow[ca8e193615b72aa8]::impls::MaybeUninitializedPlaces>, rustc_mir_dataflow[ca8e193615b72aa8]::framework::engine::Results<rustc_mir_dataflow[ca8e193615b72aa8]::impls::EverInitializedPlaces>>, core[81c431c77b3227e5]::iter::adapters::map::Map<rustc_middle[4086bdcecfc20d80]::mir::traversal::ReversePostorderIter, rustc_borrowck[294c6deda030de41]::do_mir_borrowck::{closure#2}>, rustc_borrowck[294c6deda030de41]::MirBorrowckCtxt>
  20:     0x7f7a4f72c0e7 - rustc_borrowck[294c6deda030de41]::do_mir_borrowck
  21:     0x7f7a4f71677a - rustc_borrowck[294c6deda030de41]::mir_borrowck
  22:     0x7f7a4f6aa6d9 - rustc_query_system[1ad976e1215f3964]::query::plumbing::try_execute_query::<rustc_query_impl[dee4b94ff49e365e]::plumbing::QueryCtxt, rustc_query_system[1ad976e1215f3964]::query::caches::VecCache<rustc_span[9fb21a881f0bdab2]::def_id::LocalDefId, &rustc_middle[4086bdcecfc20d80]::mir::query::BorrowCheckResult>>
  23:     0x7f7a4eb4ab82 - rustc_data_structures[ac380a40d754c2da]::sync::par_for_each_in::<&[rustc_span[9fb21a881f0bdab2]::def_id::LocalDefId], <rustc_middle[4086bdcecfc20d80]::hir::map::Map>::par_body_owners<rustc_interface[5a01d4b645e062e2]::passes::analysis::{closure#2}::{closure#0}>::{closure#0}>
  24:     0x7f7a4eb495b3 - <rustc_session[3662fe595b759729]::session::Session>::time::<(), rustc_interface[5a01d4b645e062e2]::passes::analysis::{closure#2}>
  25:     0x7f7a4eb47857 - rustc_interface[5a01d4b645e062e2]::passes::analysis
  26:     0x7f7a4fded45c - rustc_query_system[1ad976e1215f3964]::query::plumbing::try_execute_query::<rustc_query_impl[dee4b94ff49e365e]::plumbing::QueryCtxt, rustc_query_system[1ad976e1215f3964]::query::caches::DefaultCache<(), core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>>
  27:     0x7f7a4fded14b - rustc_query_system[1ad976e1215f3964]::query::plumbing::get_query::<rustc_query_impl[dee4b94ff49e365e]::queries::analysis, rustc_query_impl[dee4b94ff49e365e]::plumbing::QueryCtxt>
  28:     0x7f7a4f926f0b - <rustc_interface[5a01d4b645e062e2]::passes::QueryContext>::enter::<rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}::{closure#2}::{closure#2}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  29:     0x7f7a4f91f5bf - <rustc_interface[5a01d4b645e062e2]::interface::Compiler>::enter::<rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}::{closure#2}, core[81c431c77b3227e5]::result::Result<core[81c431c77b3227e5]::option::Option<rustc_interface[5a01d4b645e062e2]::queries::Linker>, rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  30:     0x7f7a4f91a5d8 - rustc_span[9fb21a881f0bdab2]::with_source_map::<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_interface[5a01d4b645e062e2]::interface::run_compiler<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  31:     0x7f7a4f91a0c5 - <scoped_tls[1cce71beeef11336]::ScopedKey<rustc_span[9fb21a881f0bdab2]::SessionGlobals>>::set::<rustc_interface[5a01d4b645e062e2]::interface::run_compiler<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}>::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  32:     0x7f7a4f9196b2 - std[9f362533f84673f0]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5a01d4b645e062e2]::util::run_in_thread_pool_with_globals<rustc_interface[5a01d4b645e062e2]::interface::run_compiler<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}>::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  33:     0x7f7a4f9193c8 - <<std[9f362533f84673f0]::thread::Builder>::spawn_unchecked_<rustc_interface[5a01d4b645e062e2]::util::run_in_thread_pool_with_globals<rustc_interface[5a01d4b645e062e2]::interface::run_compiler<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}>::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>::{closure#1} as core[81c431c77b3227e5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7f7a5144ad93 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9b61d15b0ee557ed
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/alloc/src/boxed.rs:2000:9
  35:     0x7f7a5144ad93 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::haff1f709ebbd1677
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/alloc/src/boxed.rs:2000:9
  36:     0x7f7a5144ad93 - std::sys::unix::thread::Thread::new::thread_start::h98e69f1908d18751
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys/unix/thread.rs:108:17
  37:     0x7f7a4d1078fd - <unknown>
  38:     0x7f7a4d189a60 - <unknown>
  39:                0x0 - <unknown>
error: internal compiler error: the following error was constructed but not emitted

error[E0382]: use of moved value: `x`
  --> 023f2218b87ae7e7afaf853e5d953b53363da95e.rs:27:17
   |
27 |     atomic_xadd(x, 1);
   |                 ^

thread '<unnamed>' panicked at 'error was constructed but not emitted', compiler/rustc_errors/src/diagnostic_builder.rs:675:21
stack backtrace:
   0:     0x7f7a4d3662aa - std::backtrace_rs::backtrace::libunwind::trace::hb323b1c60fddca93
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f7a4d3662aa - std::backtrace_rs::backtrace::trace_unsynchronized::hc84e7bf61bca2c6e
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f7a4d3662aa - std::sys_common::backtrace::_print_fmt::h6d347369517c3499
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f7a4d3662aa - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha8becfe32371a83b
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f7a4d3c8bae - core::fmt::write::h49d04e24a4a0f5b0
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f7a4d3566e5 - std::io::Write::write_fmt::h51e3e9a867946d92
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/io/mod.rs:1682:15
   6:     0x7f7a4d366075 - std::sys_common::backtrace::_print::hdca39b4597f42be8
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f7a4d366075 - std::sys_common::backtrace::print::h90a45fec0894e48c
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f7a4d368d9f - std::panicking::default_hook::{{closure}}::h33ff658e7827f9cc
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:267:22
   9:     0x7f7a4d368adb - std::panicking::default_hook::h7b258e9d452b029f
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:286:9
  10:     0x7f7a4d3695bc - std::panicking::rust_panic_with_hook::hf8e2608dfe7b3876
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:688:13
  11:     0x7f7a4d369312 - std::panicking::begin_panic_handler::{{closure}}::hf08f8046f55d20d0
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:577:13
  12:     0x7f7a4d36675c - std::sys_common::backtrace::__rust_end_short_backtrace::h156042f7f0b912a5
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x7f7a4d369062 - rust_begin_unwind
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/panicking.rs:575:5
  14:     0x7f7a4d3c55c3 - core::panicking::panic_fmt::h65ed150133999c5f
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/core/src/panicking.rs:65:14
  15:     0x7f7a4f4075fd - <rustc_errors[fa90e1d5d2ab9e2c]::diagnostic_builder::DiagnosticBuilderInner as core[81c431c77b3227e5]::ops::drop::Drop>::drop
  16:     0x7f7a5040566d - core[81c431c77b3227e5]::ptr::drop_in_place::<rustc_errors[fa90e1d5d2ab9e2c]::diagnostic_builder::DiagnosticBuilder<rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  17:     0x7f7a50410209 - <rustc_borrowck[294c6deda030de41]::MirBorrowckCtxt>::report_use_of_moved_or_uninitialized
  18:     0x7f7a4ec6e3ea - <rustc_borrowck[294c6deda030de41]::MirBorrowckCtxt as rustc_mir_dataflow[ca8e193615b72aa8]::framework::visitor::ResultsVisitor>::visit_statement_before_primary_effect
  19:     0x7f7a4f753463 - rustc_mir_dataflow[ca8e193615b72aa8]::framework::visitor::visit_results::<rustc_borrowck[294c6deda030de41]::dataflow::BorrowckAnalyses<rustc_index[348215daae5de83b]::bit_set::BitSet<rustc_borrowck[294c6deda030de41]::dataflow::BorrowIndex>, rustc_index[348215daae5de83b]::bit_set::ChunkedBitSet<rustc_mir_dataflow[ca8e193615b72aa8]::move_paths::MovePathIndex>, rustc_index[348215daae5de83b]::bit_set::ChunkedBitSet<rustc_mir_dataflow[ca8e193615b72aa8]::move_paths::InitIndex>>, rustc_borrowck[294c6deda030de41]::dataflow::BorrowckAnalyses<rustc_mir_dataflow[ca8e193615b72aa8]::framework::engine::Results<rustc_borrowck[294c6deda030de41]::dataflow::Borrows>, rustc_mir_dataflow[ca8e193615b72aa8]::framework::engine::Results<rustc_mir_dataflow[ca8e193615b72aa8]::impls::MaybeUninitializedPlaces>, rustc_mir_dataflow[ca8e193615b72aa8]::framework::engine::Results<rustc_mir_dataflow[ca8e193615b72aa8]::impls::EverInitializedPlaces>>, core[81c431c77b3227e5]::iter::adapters::map::Map<rustc_middle[4086bdcecfc20d80]::mir::traversal::ReversePostorderIter, rustc_borrowck[294c6deda030de41]::do_mir_borrowck::{closure#2}>, rustc_borrowck[294c6deda030de41]::MirBorrowckCtxt>
  20:     0x7f7a4f72c0e7 - rustc_borrowck[294c6deda030de41]::do_mir_borrowck
  21:     0x7f7a4f71677a - rustc_borrowck[294c6deda030de41]::mir_borrowck
  22:     0x7f7a4f6aa6d9 - rustc_query_system[1ad976e1215f3964]::query::plumbing::try_execute_query::<rustc_query_impl[dee4b94ff49e365e]::plumbing::QueryCtxt, rustc_query_system[1ad976e1215f3964]::query::caches::VecCache<rustc_span[9fb21a881f0bdab2]::def_id::LocalDefId, &rustc_middle[4086bdcecfc20d80]::mir::query::BorrowCheckResult>>
  23:     0x7f7a4eb4ab82 - rustc_data_structures[ac380a40d754c2da]::sync::par_for_each_in::<&[rustc_span[9fb21a881f0bdab2]::def_id::LocalDefId], <rustc_middle[4086bdcecfc20d80]::hir::map::Map>::par_body_owners<rustc_interface[5a01d4b645e062e2]::passes::analysis::{closure#2}::{closure#0}>::{closure#0}>
  24:     0x7f7a4eb495b3 - <rustc_session[3662fe595b759729]::session::Session>::time::<(), rustc_interface[5a01d4b645e062e2]::passes::analysis::{closure#2}>
  25:     0x7f7a4eb47857 - rustc_interface[5a01d4b645e062e2]::passes::analysis
  26:     0x7f7a4fded45c - rustc_query_system[1ad976e1215f3964]::query::plumbing::try_execute_query::<rustc_query_impl[dee4b94ff49e365e]::plumbing::QueryCtxt, rustc_query_system[1ad976e1215f3964]::query::caches::DefaultCache<(), core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>>
  27:     0x7f7a4fded14b - rustc_query_system[1ad976e1215f3964]::query::plumbing::get_query::<rustc_query_impl[dee4b94ff49e365e]::queries::analysis, rustc_query_impl[dee4b94ff49e365e]::plumbing::QueryCtxt>
  28:     0x7f7a4f926f0b - <rustc_interface[5a01d4b645e062e2]::passes::QueryContext>::enter::<rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}::{closure#2}::{closure#2}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  29:     0x7f7a4f91f5bf - <rustc_interface[5a01d4b645e062e2]::interface::Compiler>::enter::<rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}::{closure#2}, core[81c431c77b3227e5]::result::Result<core[81c431c77b3227e5]::option::Option<rustc_interface[5a01d4b645e062e2]::queries::Linker>, rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  30:     0x7f7a4f91a5d8 - rustc_span[9fb21a881f0bdab2]::with_source_map::<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_interface[5a01d4b645e062e2]::interface::run_compiler<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  31:     0x7f7a4f91a0c5 - <scoped_tls[1cce71beeef11336]::ScopedKey<rustc_span[9fb21a881f0bdab2]::SessionGlobals>>::set::<rustc_interface[5a01d4b645e062e2]::interface::run_compiler<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}>::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  32:     0x7f7a4f9196b2 - std[9f362533f84673f0]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5a01d4b645e062e2]::util::run_in_thread_pool_with_globals<rustc_interface[5a01d4b645e062e2]::interface::run_compiler<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}>::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>
  33:     0x7f7a4f9193c8 - <<std[9f362533f84673f0]::thread::Builder>::spawn_unchecked_<rustc_interface[5a01d4b645e062e2]::util::run_in_thread_pool_with_globals<rustc_interface[5a01d4b645e062e2]::interface::run_compiler<core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>, rustc_driver[49d0649a537a4dce]::run_compiler::{closure#1}>::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[81c431c77b3227e5]::result::Result<(), rustc_errors[fa90e1d5d2ab9e2c]::ErrorGuaranteed>>::{closure#1} as core[81c431c77b3227e5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7f7a5144ad93 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9b61d15b0ee557ed
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/alloc/src/boxed.rs:2000:9
  35:     0x7f7a5144ad93 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::haff1f709ebbd1677
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/alloc/src/boxed.rs:2000:9
  36:     0x7f7a5144ad93 - std::sys::unix::thread::Thread::new::thread_start::h98e69f1908d18751
                               at /rustc/5dfb4b0afaf6acace0845d00e85a934fb4289d83/library/std/src/sys/unix/thread.rs:108:17
  37:     0x7f7a4d1078fd - <unknown>
  38:     0x7f7a4d189a60 - <unknown>
  39:                0x0 - <unknown>
thread panicked while panicking. aborting.

[compiler-errors]

The real error isn't the unemitted diagnostic, it's the unwrap. The unemitted diagnostic only happens bc this unwrap occurs during diagnostics code, I think.

[matthiaskrgr]

cc @estebank I think this might be #103908 and we try to suggest .clone() which is not available for the type though?

[mucinoab]

If you add

#[lang = "clone"]
trait Clone {}

... to the example you no longer ICE and just hit the normal error[E0382]: use of moved value: 'x'

[mucinoab]

@rustbot claim

[compiler-errors]

Please use this minimized repro:

#![feature(no_core, lang_items)]
#![no_core]

#[lang = "sized"]
trait Sized {}

#[lang = "copy"]
trait Copy {}

fn g<T>(x: T) {}

fn f(x: *mut u8) {
    g(x);
    g(x);
}

[matthiaskrgr]

[estebank]

Every time I think "surely this unwrap will be fine", it bites me in the read as sure as the sun coming up.

[JakobDegen]

Are we fixing #![feature(no_core)] ICEs? Not so sure we should bother...