rustc panic when trying to unwrap DistinctSources

[software-opal]

When trying to compile the tests for my code I get this error:

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: DistinctSources(DistinctSources { begin: (Real("tests/macros.rs"), BytePos(2369)), end: (Macros("::archivelib::support::debug::check_rust_against_sys_decompress"), BytePos(8771655)) })', src/libcore/result.rs:999:5
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 1.37.0 (eae3437df 2019-08-13) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental -C link-arg=-fuse-ld=gold -C opt-level=0

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

error: Could not compile `archivelib`.

`RUST_BACKTRACE=full cargo test`

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: DistinctSources(DistinctSources { begin: (Real("tests/macros.rs"), BytePos(2369)), end: (Macros("::archivelib::support::debug::check_rust_against_sys_decompress"), BytePos(8771655)) })', src/libcore/result.rs:999:5
stack backtrace:
   0:     0x7f2a2283636b - backtrace::backtrace::libunwind::trace::hfe5db90796807973                                                                                                                                                                                                                           at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
   1:     0x7f2a2283636b - backtrace::backtrace::trace_unsynchronized::h34b865a835594335
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
   2:     0x7f2a2283636b - std::sys_common::backtrace::_print::h527254ae44989167
                               at src/libstd/sys_common/backtrace.rs:47
   3:     0x7f2a2283636b - std::sys_common::backtrace::print::he85dd5ddddf46503
                               at src/libstd/sys_common/backtrace.rs:36
   4:     0x7f2a2283636b - std::panicking::default_hook::{{closure}}::h847a2eb38b396f14
                               at src/libstd/panicking.rs:200
   5:     0x7f2a22836047 - std::panicking::default_hook::h2ca0f9a30a0e206b
                               at src/libstd/panicking.rs:214
   6:     0x7f2a1fd83211 - rustc::util::common::panic_hook::hd4598aac709d8bd1
   7:     0x7f2a22836bc9 - std::panicking::rust_panic_with_hook::hffcefc09751839d1
                               at src/libstd/panicking.rs:481
   8:     0x7f2a22836662 - std::panicking::continue_panic_fmt::hc0f142c930c846fc
                               at src/libstd/panicking.rs:384
   9:     0x7f2a22836546 - rust_begin_unwind
                               at src/libstd/panicking.rs:311
  10:     0x7f2a22863dcd - core::panicking::panic_fmt::h2daf88b2616ca2b2
                               at src/libcore/panicking.rs:85
  11:     0x7f2a2139a5de - core::result::unwrap_failed::h6fc0053c9f46fa1a
  12:     0x7f2a2114a6d9 - rustc_mir::borrow_check::move_errors::<impl rustc_mir::borrow_check::MirBorrowckCtxt>::report::hf8f36da850a20b7c
  13:     0x7f2a21154cd8 - rustc_mir::borrow_check::do_mir_borrowck::hb7a693a299dea277
  14:     0x7f2a20ff89dd - rustc::ty::context::GlobalCtxt::enter_local::h07eff323eb978daa
  15:     0x7f2a2115332a - rustc_mir::borrow_check::mir_borrowck::h284fb7de9a37bcfa
  16:     0x7f2a21a772c7 - rustc::ty::query::__query_compute::mir_borrowck::hff15ac0e1f9f6137
  17:     0x7f2a21a87e35 - rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::mir_borrowck>::compute::hee288ed314d409e6
  18:     0x7f2a21abcb60 - rustc::dep_graph::graph::DepGraph::with_task_impl::hf31f0af6331d7b71
  19:     0x7f2a21aa4f7a - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::hee29daf6559cca17
  20:     0x7f2a21a87cb3 - rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners::hcfdff9dc5dadc257
  21:     0x7f2a21a4548e - rustc::util::common::time::hac94dadf7399ba87
  22:     0x7f2a21a001d2 - rustc_interface::passes::analysis::h39d33eb2a40812a3
  23:     0x7f2a22afa246 - rustc::ty::query::__query_compute::analysis::hf896d9719452bef1
  24:     0x7f2a22af9f99 - rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::analysis>::compute::h314df7d2740153f0
  25:     0x7f2a22b8f138 - rustc::dep_graph::graph::DepGraph::with_task_impl::h5bfe7e398dba7700
  26:     0x7f2a22aff3be - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::hf803a152be45b4ee
  27:     0x7f2a22b00da6 - rustc::ty::context::tls::enter_global::h7f57e6c49574182e
  28:     0x7f2a22b052f7 - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::h04fd22292950fbf4
  29:     0x7f2a21a4843a - rustc_interface::passes::create_global_ctxt::{{closure}}::h70f679c0b82043da
  30:     0x7f2a22b065f8 - rustc_interface::interface::run_compiler_in_existing_thread_pool::h1ee6f3bf0ba37faf
  31:     0x7f2a22b28d42 - std::thread::local::LocalKey<T>::with::h83b0a2026f4a2c6e
  32:     0x7f2a22b3c891 - scoped_tls::ScopedKey<T>::set::h47171c9859321621
  33:     0x7f2a22b548b4 - syntax::with_globals::h7dd1a1171ce8a4bf
  34:     0x7f2a22b7fb1d - std::sys_common::backtrace::__rust_begin_short_backtrace::h1ed9f0eaa05c0996
  35:     0x7f2a2284748a - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:82
  36:     0x7f2a22b08cc9 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h3b9a37e8ad92df6e
  37:     0x7f2a22819e0f - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h42806b83647d4c79
                               at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/liballoc/boxed.rs:746
  38:     0x7f2a22846170 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h83c921c8e826dd1d
                               at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/liballoc/boxed.rs:746
  39:     0x7f2a22846170 - std::sys_common::thread::start_thread::h2613204ce513782e
                               at src/libstd/sys_common/thread.rs:13
  40:     0x7f2a22846170 - std::sys::unix::thread::Thread::new::thread_start::h4570080769500bcd
                               at src/libstd/sys/unix/thread.rs:79
  41:     0x7f2a225a76db - start_thread
  42:     0x7f2a21ea188f - __clone
  43:                0x0 - <unknown>
query stack during panic:
#0 [mir_borrowck] processing `short_sample::test_decompress_level_0`                                                                                                                                                                                                            #1 [analysis] running analysis passes on this crate                                                                                                                                                                                                                             end of query stack
                                                                                                                                                                                                                                                                                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 1.37.0 (eae3437df 2019-08-13) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental -C link-arg=-fuse-ld=gold -C opt-level=0

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

error: Could not compile `archivelib`.                      

My understanding is that the compiler was trying to tell me about a borrow checker error; but I have no idea where to start minimizing this error(sorry).

[hellow554]

I have managed to get it down to two files:

lib.rs:

#[macro_use]
mod ext;

struct A;

macro_rules! sss {
    () => {
        #[test]
        fn fff() {
            static D: A = A;
            aaa!(D);
        }
    };
}

sss!();

ext.rs

macro_rules! aaa {
    ($c:ident) => {{
        let a = $c;
    }}
}

It doesn't work with a mod in the lib.rs, it has to be a different file. cargo test is then needed to trigger the ICE.

[hellow554]

@rustbot modify labels: I-ICE A-macros C-Bug T-compiler

[Centril]

cc @matthewjasper

[hellow554]

Seems to be related to 2018 edition? If I use the nightly-2018-10-01 and execute rustc src/lib.rs --test --edition=2015 it doesn't ICE, but with rustc src/lib.rs --test --edition=2018 it does ICE. well...

[Centril]

Most likely related to the fact that NLL is active in Rust 2018 then.

[hellow554]

Bisecting: Somewhere in d767ee1...b202882

[hellow554]

Most likely related to the fact that NLL is active in Rust 2018 then.

Confirmed. #![feature(nll)] gave me the ICE on 2015 as well (forgot that in the good ol' days nll was not a thing)
Also confirmed, that edition 2015 does ICE with feature(nll) on b202882 and not on d767ee1 (like edition 2018 did above).

[hellow554]

Also ICE with -Z polonius

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: DistinctSources(DistinctSources { begin: (Real("src/lib.rs"), BytePos(0)), end: (Real("src/ext.rs"), BytePos(179)) })', src/libcore/result.rs:1084:5
stack backtrace:
   0:     0x7fd5a7664742 - backtrace::backtrace::libunwind::trace::h5b672ea0408452ed
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.35/src/backtrace/libunwind.rs:88
   1:     0x7fd5a7664742 - backtrace::backtrace::trace_unsynchronized::h15bbd54ccd30253c
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.35/src/backtrace/mod.rs:66
   2:     0x7fd5a7664742 - std::sys_common::backtrace::_print::hbf32a02f9894e727
                               at src/libstd/sys_common/backtrace.rs:47
   3:     0x7fd5a7664742 - std::sys_common::backtrace::print::h127d55b04a8ca638
                               at src/libstd/sys_common/backtrace.rs:36
   4:     0x7fd5a7664742 - std::panicking::default_hook::{{closure}}::h41569aa1cabd15f2
                               at src/libstd/panicking.rs:200
   5:     0x7fd5a7664426 - std::panicking::default_hook::h2471d95c3baf1435
                               at src/libstd/panicking.rs:214
   6:     0x7fd5a9520331 - rustc::util::common::panic_hook::h2022bda27bb76336
   7:     0x7fd5a7664f7c - std::panicking::rust_panic_with_hook::hdb74b1d76abfd8b2
                               at src/libstd/panicking.rs:481
   8:     0x7fd5a7664a32 - std::panicking::continue_panic_fmt::h7aad477695105344
                               at src/libstd/panicking.rs:384
   9:     0x7fd5a7664926 - rust_begin_unwind
                               at src/libstd/panicking.rs:311
  10:     0x7fd5a76917ba - core::panicking::panic_fmt::h2a7634fba4671b05
                               at src/libcore/panicking.rs:85
  11:     0x7fd5a76919f7 - core::result::unwrap_failed::h395c34a928fec133
                               at src/libcore/result.rs:1084
  12:     0x7fd5a84e91b5 - rustc_mir::borrow_check::move_errors::<impl rustc_mir::borrow_check::MirBorrowckCtxt>::report::h25a9cf486d5266a9
  13:     0x7fd5a84f1b4b - rustc_mir::borrow_check::do_mir_borrowck::hda4dab5518004986
  14:     0x7fd5a85ab923 - rustc::ty::context::GlobalCtxt::enter_local::h7429ee56447ea8af
  15:     0x7fd5a84f00de - rustc_mir::borrow_check::mir_borrowck::h85ba4c70317d3291
  16:     0x7fd5a7c04ac2 - rustc::ty::query::__query_compute::mir_borrowck::h98fb41102a77b5f0
  17:     0x7fd5a7cd1c3c - rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::mir_borrowck>::compute::h9802436be570eac8
  18:     0x7fd5a7cffcc4 - rustc::dep_graph::graph::DepGraph::with_task_impl::h72798b490d7dda9f
  19:     0x7fd5a7ce2b53 - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::h923529f6824dea4f
  20:     0x7fd5a7cd1b1d - rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners::h61fa4efa258d8006
  21:     0x7fd5a7ca152c - rustc::util::common::time::h3cf71e821181dc48
  22:     0x7fd5a7c486da - rustc_interface::passes::analysis::h9f50cf021540f6a4
  23:     0x7fd5a7b29291 - rustc::ty::query::__query_compute::analysis::he59e8eea93928c08
  24:     0x7fd5a7b39d1d - rustc::dep_graph::graph::DepGraph::with_task_impl::h6dea995610f354d4
  25:     0x7fd5a7b460de - rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query::h68b2231d3424095f
  26:     0x7fd5a7b652a5 - rustc::ty::context::tls::enter_global::he96502a63341a2b8
  27:     0x7fd5a7b4c487 - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::h9e5505cac0dd4781
  28:     0x7fd5a7ca650a - rustc_interface::passes::create_global_ctxt::{{closure}}::h63fdbd27f3ec6fd7
  29:     0x7fd5a7b4e68e - rustc_interface::interface::run_compiler_in_existing_thread_pool::h9e1e785d8bd30ef2
  30:     0x7fd5a7b87412 - std::thread::local::LocalKey<T>::with::hd628004bbe9136f1
  31:     0x7fd5a7b8ef3e - scoped_tls::ScopedKey<T>::set::hb63f3a057333c317
  32:     0x7fd5a7bc07f2 - syntax::with_globals::he4a92d8220bc2e1b
  33:     0x7fd5a7b1ec52 - std::sys_common::backtrace::__rust_begin_short_backtrace::hd1bf2fb1e8e27b88
  34:     0x7fd5a767583a - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:80
  35:     0x7fd5a7b50209 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h2a4f847e90febcd1
  36:     0x7fd5a764840f - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h63427f5093f1aac0
                               at /rustc/e44fdf97929d1315add3b76208adf99e8299252d/src/liballoc/boxed.rs:922
  37:     0x7fd5a76744c0 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h398cbfcb305a969f
                               at /rustc/e44fdf97929d1315add3b76208adf99e8299252d/src/liballoc/boxed.rs:922
  38:     0x7fd5a76744c0 - std::sys_common::thread::start_thread::h55519c3a5f7d36e1
                               at src/libstd/sys_common/thread.rs:13
  39:     0x7fd5a76744c0 - std::sys::unix::thread::Thread::new::thread_start::hace5e416996b8e04
                               at src/libstd/sys/unix/thread.rs:79
  40:     0x7fd5a75b375a - start_thread
  41:     0x7fd5a74ca9f3 - __clone
  42:                0x0 - <unknown>
query stack during panic:
#0 [mir_borrowck] processing `fff`
#1 [analysis] running analysis passes on this crate
end of query stack

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 1.39.0-nightly (e44fdf979 2019-08-21) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z polonius