ICE on rustc 1.41.0-nightly (25d8a9494 2019-11-29) running on x86_64-apple-darwin

[maghoff]

I encounter an ICE:

• with rustc 1.41.0-nightly (25d8a94 2019-11-29) running on x86_64-apple-darwin
• when compiling https://github.com/maghoff/pixu.rs/tree/ice-2019-11-29

The same code does not ICE when using nightly-2019-11-27-x86_64-apple-darwin

Sorry, I haven't taken the time to make a minimal reproduction example.

[jonas-schievink]

Can you post the ICE message and backtrace?

[maghoff]

Certainly! Although it is not the best stacktrace I have ever seen.

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', /rustc/25d8a9494ca6d77361e47c1505ecf640b168819e/src/libcore/macros/mod.rs:15:40
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.41.0-nightly (25d8a9494 2019-11-29) running on x86_64-apple-darwin

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

error: could not compile `pixurs`.

To learn more, run the command again with --verbose.

Backtrace:

    Checking pixurs v0.1.0 (/Users/mag/prog/pixu.rs)
thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', /rustc/25d8a9494ca6d77361e47c1505ecf640b168819e/src/libcore/macros/mod.rs:15:40
stack backtrace:
   0:        0x111291e65 - <unknown>
   1:        0x1112c8ba0 - <unknown>
   2:        0x1112856eb - <unknown>
   3:        0x111296273 - <unknown>
   4:        0x111295f7a - <unknown>
   5:        0x10e6f2bc2 - <unknown>
   6:        0x111296a8c - <unknown>
   7:        0x111296519 - <unknown>
   8:        0x111296419 - <unknown>
   9:        0x1112c224c - <unknown>
  10:        0x1112c21a4 - <unknown>
  11:        0x10efb7eb1 - <unknown>
  12:        0x10efd2b29 - <unknown>
  13:        0x10efd2336 - <unknown>
  14:        0x10efcc64d - <unknown>
  15:        0x10efc93c6 - <unknown>
  16:        0x10f283291 - <unknown>
  17:        0x10efc7620 - <unknown>
  18:        0x10ef52f83 - <unknown>
  19:        0x10f2723da - <unknown>
  20:        0x10f359b05 - <unknown>
  21:        0x10f35e3c0 - <unknown>
  22:        0x10f3515da - <unknown>
  23:        0x10f2c5281 - <unknown>
  24:        0x10efc7fc6 - <unknown>
  25:        0x10f283291 - <unknown>
  26:        0x10efc7620 - <unknown>
  27:        0x10e80ee53 - <unknown>
  28:        0x10e7e558f - <unknown>
  29:        0x10e7a5a72 - <unknown>
  30:        0x10e801489 - <unknown>
  31:        0x10e7e511e - <unknown>
  32:        0x10e818e13 - <unknown>
  33:        0x10e6aaa7f - <unknown>
  34:        0x10e6c812b - <unknown>
  35:        0x10e6fd67a - <unknown>
  36:        0x10e6bfd1c - <unknown>
  37:        0x10e76d54b - <unknown>
  38:        0x10e6bfb3b - <unknown>
  39:        0x10e6f62b7 - <unknown>
  40:        0x10e6ade34 - <unknown>
  41:        0x10e6a7712 - <unknown>
  42:        0x10e6c9455 - <unknown>
  43:        0x10e6a853c - <unknown>
  44:        0x1112a61ff - <unknown>
  45:        0x10e6c1057 - <unknown>
  46:        0x111277cae - <unknown>
  47:        0x1112a4f3e - <unknown>
  48:     0x7fff59cbd2eb - <unknown>
  49:     0x7fff59cc0249 - <unknown>

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.41.0-nightly (25d8a9494 2019-11-29) running on x86_64-apple-darwin

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [mir_borrowck] processing `site::auth::initiate_auth::InitiateAuth::<S>::try_post::{{closure}}#0`
#1 [mir_borrowck] processing `site::auth::initiate_auth::InitiateAuth::<S>::try_post`
#2 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `pixurs`.

To learn more, run the command again with --verbose.

[hellow554]

Backtrace:

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', /rustc/fdc0011561c6365c596dfd8fa1ef388162bc89c7/src/libcore/macros/mod.rs:15:40
stack backtrace:
   0:     0x7f6c56fc45d4 - backtrace::backtrace::libunwind::trace::hc586f95f659e6084
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
   1:     0x7f6c56fc45d4 - backtrace::backtrace::trace_unsynchronized::ha9827fdb593fd967
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
   2:     0x7f6c56fc45d4 - std::sys_common::backtrace::_print_fmt::h00c888c95e07165a
                               at src/libstd/sys_common/backtrace.rs:84
   3:     0x7f6c56fc45d4 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8407ffb2d059bc74
                               at src/libstd/sys_common/backtrace.rs:61
   4:     0x7f6c56ffccec - core::fmt::write::h4165a12a3856465f
                               at src/libcore/fmt/mod.rs:1024
   5:     0x7f6c56fb8937 - std::io::Write::write_fmt::h499a0566ceaa0048
                               at src/libstd/io/mod.rs:1428
   6:     0x7f6c56fc8a7e - std::sys_common::backtrace::_print::h05fbb11587298e2b
                               at src/libstd/sys_common/backtrace.rs:65
   7:     0x7f6c56fc8a7e - std::sys_common::backtrace::print::h8021a3ed2b5ff07e
                               at src/libstd/sys_common/backtrace.rs:50
   8:     0x7f6c56fc8a7e - std::panicking::default_hook::{{closure}}::hd3a6326f5c6c149f
                               at src/libstd/panicking.rs:193
   9:     0x7f6c56fc8771 - std::panicking::default_hook::h7088fb00a0cb1faf
                               at src/libstd/panicking.rs:210
  10:     0x7f6c5750e833 - rustc_driver::report_ice::h7d5c1d6a7c4e3fb5
  11:     0x7f6c49f8c918 - <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call::hd4fe407a7a08ec81
                               at /rustc/fdc0011561c6365c596dfd8fa1ef388162bc89c7/src/liballoc/boxed.rs:983
  12:     0x7f6c49f6a814 - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}::hb9b2f3bc1e19f0f3
                               at /rustc/fdc0011561c6365c596dfd8fa1ef388162bc89c7/src/libproc_macro/bridge/client.rs:305
  13:     0x7f6c56fc9230 - std::panicking::rust_panic_with_hook::h6b223bff7721d4c1
                               at src/libstd/panicking.rs:475
  14:     0x7f6c56fc8d0e - rust_begin_unwind
                               at src/libstd/panicking.rs:375
  15:     0x7f6c56ff678e - core::panicking::panic_fmt::hed15e18c2b62a00c
                               at src/libcore/panicking.rs:82
  16:     0x7f6c56ff66da - core::panicking::panic::h676e2cfc7b84ffe6
                               at src/libcore/panicking.rs:49
  17:     0x7f6c57ec3df6 - rustc_mir::borrow_check::conflict_errors::<impl rustc_mir::borrow_check::MirBorrowckCtxt>::report_use_of_moved_or_uninitialized::hee7349248e2bcffb
  18:     0x7f6c57ede704 - rustc_mir::borrow_check::MirBorrowckCtxt::check_if_path_or_subpath_is_moved::he52872991422c41b
  19:     0x7f6c57eddf47 - rustc_mir::borrow_check::MirBorrowckCtxt::consume_operand::h9209f248792f8178
  20:     0x7f6c57ed83d7 - <rustc_mir::borrow_check::MirBorrowckCtxt as rustc_mir::dataflow::DataflowResultsConsumer>::visit_statement_entry::h3716ddc9fad46cc7
  21:     0x7f6c57ed4e89 - rustc_mir::borrow_check::do_mir_borrowck::h820ef35edc5ac038
  22:     0x7f6c581c205a - rustc::ty::context::GlobalCtxt::enter_local::h1ed6b75232f132b5
  23:     0x7f6c57ed2cfa - rustc_mir::borrow_check::mir_borrowck::h45f028e130853501
  24:     0x7f6c57e70b23 - rustc::ty::query::__query_compute::mir_borrowck::h25976ba17001de12
  25:     0x7f6c58195b58 - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::hc4244918c0627345
  26:     0x7f6c582d4f07 - rustc_mir::borrow_check::nll::type_check::TypeChecker::check_rvalue::h2bf06f16cb29ad88
  27:     0x7f6c582d9607 - rustc_mir::borrow_check::nll::type_check::TypeChecker::typeck_mir::hb499a59c8246eb57
  28:     0x7f6c582ccfda - rustc_mir::borrow_check::nll::type_check::type_check::ha16b660f3db7b1f1
  29:     0x7f6c582105e5 - rustc_mir::borrow_check::nll::compute_regions::h0260c515d4faa652
  30:     0x7f6c57ed380b - rustc_mir::borrow_check::do_mir_borrowck::h820ef35edc5ac038
  31:     0x7f6c581c205a - rustc::ty::context::GlobalCtxt::enter_local::h1ed6b75232f132b5
  32:     0x7f6c57ed2cfa - rustc_mir::borrow_check::mir_borrowck::h45f028e130853501
  33:     0x7f6c57657523 - rustc::ty::query::__query_compute::mir_borrowck::h4ee3c16667cb0a75
  34:     0x7f6c5761d5fc - rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::mir_borrowck>::compute::hf9e1e7d649716be5
  35:     0x7f6c575d9cf1 - rustc::dep_graph::graph::DepGraph::with_task_impl::h95e619e376fed8f1
  36:     0x7f6c576392d0 - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::hb2c0f4fa5a8fab0b
  37:     0x7f6c5761d1b8 - rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners::hb5ec544f452a4999
  38:     0x7f6c576637c3 - rustc_interface::passes::analysis::h11e465c53db707c6
  39:     0x7f6c574a1fc2 - rustc::ty::query::__query_compute::analysis::h8209330e6c35c935
  40:     0x7f6c574f1049 - rustc::dep_graph::graph::DepGraph::with_task_impl::hc0ff0e0262a656d9
  41:     0x7f6c57517658 - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::h364920cc587f967c
  42:     0x7f6c574bf755 - rustc::ty::context::tls::enter_global::h6be5e193e6b6506c
  43:     0x7f6c574d550f - rustc_interface::interface::run_compiler_in_existing_thread_pool::h450b3e47e99b2a02
  44:     0x7f6c574a5b72 - std::thread::local::LocalKey<T>::with::hc064f9c463ba87b1
  45:     0x7f6c5749f68e - scoped_tls::ScopedKey<T>::set::he618e0867346e071
  46:     0x7f6c575199a4 - syntax::with_globals::h05656a832d1edc4c
  47:     0x7f6c5751bb00 - std::sys_common::backtrace::__rust_begin_short_backtrace::hb45a6b809630e3e0
  48:     0x7f6c56fd9d0a - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:78
  49:     0x7f6c574b6469 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h0091d3870173b469
  50:     0x7f6c56faa88f - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h9ef9eb6ec2ee6be0
                               at /rustc/fdc0011561c6365c596dfd8fa1ef388162bc89c7/src/liballoc/boxed.rs:969
  51:     0x7f6c56fd8730 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::hc0fc46e9a64f076e
                               at /rustc/fdc0011561c6365c596dfd8fa1ef388162bc89c7/src/liballoc/boxed.rs:969
  52:     0x7f6c56fd8730 - std::sys_common::thread::start_thread::h4eee21a391e25c99
                               at src/libstd/sys_common/thread.rs:13
  53:     0x7f6c56fd8730 - std::sys::unix::thread::Thread::new::thread_start::h673f7c20aae94594
                               at src/libstd/sys/unix/thread.rs:80
  54:     0x7f6c56f17669 - start_thread
  55:     0x7f6c56e2c323 - clone
  56:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.41.0-nightly (fdc001156 2019-12-02) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [mir_borrowck] processing `site::auth::initiate_auth::InitiateAuth::<S>::try_post::{{closure}}#0`
#1 [mir_borrowck] processing `site::auth::initiate_auth::InitiateAuth::<S>::try_post`
#2 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `pixurs`.

[hellow554]

@rustbot modify labels: A-mir

[hellow554]

I think I have a clue here:
First the code:

struct Ia<S>(u32, S); 

impl<S> Ia<S> {
    fn partial(_: S) {}
    fn full(self) {}

    async fn crash(self) {
        Self::partial(self.1);
        Self::full(self);
    }
}

fn main() {}

The problem seems to be a partial move of self together with async together with a generic type S (if we replace S by String for example, rust will complain as well and no ICE).

If we remove the async rust will complain:

error[E0382]: use of moved value: `self`
 --> src/main.rs:9:20
  |
8 |         Self::partial(self.1);
  |                       ------ value moved here
9 |         Self::full(self);
  |                    ^^^^ value used here after partial move
  |
  = note: move occurs because `self.1` has type `S`, which does not implement the `Copy` trait

@rustbot modify labels: +A-async-await -E-needs-mcve +E-needs-bisection