Compiler panic while building alga

[rocurley]

I tried this code:

git clone git@github.com:sebcrozet/alga.git
cd alga
export RUST_BACKTRACE=full
cargo build --verbose

I expected to see this happen: Alga builds successfully, or fails to build with compile errors.

Instead, this happened: The compiler panicked.

Meta

rustc --version --verbose:

rustc 1.26.0-nightly (322d7f7b9 2018-02-25)
binary: rustc
commit-hash: 322d7f7b97f1672bade31e1c43d5753e0e45a1a8
commit-date: 2018-02-25
host: x86_64-unknown-linux-gnu
release: 1.26.0-nightly
LLVM version: 6.0

Backtrace:

       Fresh unicode-xid v0.0.4
       Fresh num-traits v0.2.0
       Fresh cfg-if v0.1.2
       Fresh utf8-ranges v0.1.3
       Fresh approx v0.1.1
       Fresh regex-syntax v0.3.9
       Fresh rustc-serialize v0.3.24
       Fresh winapi v0.2.8
       Fresh libc v0.2.36
       Fresh winapi-build v0.1.1
       Fresh quote v0.3.15
       Fresh edit-distance v1.0.0
       Fresh synom v0.11.3
       Fresh num-traits v0.1.43
       Fresh log v0.4.1
       Fresh num-complex v0.1.42
       Fresh memchr v0.1.11
       Fresh rand v0.4.2
       Fresh syn v0.11.11
   Compiling log v0.3.9
   Compiling alga v0.5.3 (file:///home/roger/alga/alga)
     Running `rustc --crate-name alga alga/src/lib.rs --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=7d8a4bc96630a5c1 -C extra-filename=-7d8a4bc96630a5c1 --out-dir /home/roger/alga/target/debug/deps -C incremental=/home/roger/alga/target/debug/incremental -L dependency=/home/roger/alga/target/debug/deps --extern num_complex=/home/roger/alga/target/debug/deps/libnum_complex-070709ff52c451f1.rlib --extern approx=/home/roger/alga/target/debug/deps/libapprox-c539f28333436395.rlib --extern num_traits=/home/roger/alga/target/debug/deps/libnum_traits-40976005af172ca0.rlib`
     Running `rustc --crate-name log /home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/log-0.3.9/src/lib.rs --crate-type lib --emit=dep-info,link -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="log"' --cfg 'feature="use_std"' -C metadata=744c229531176343 -C extra-filename=-744c229531176343 --out-dir /home/roger/alga/target/debug/deps -L dependency=/home/roger/alga/target/debug/deps --extern log=/home/roger/alga/target/debug/deps/liblog-5e7b6585e95ec20d.rlib --cap-lints allow`
warning: unused macro definition
   --> alga/src/macros.rs:143:1
    |
143 | / macro_rules! impl_approx_eq {
144 | |     ($V:expr; $($T:ty),* $(,)*) => {
145 | |         $(impl ApproxEq for $T {
146 | |             type Eps = $T;
...   |
158 | |     }
159 | | }
    | |_^
    |
    = note: #[warn(unused_macros)] on by default

warning: unused macro definition
  --> alga/src/general/one_operator.rs:84:1
   |
84 | / macro_rules! impl_quasigroup(
85 | |     (<$M:ty> for $($T:tt)+) => {
86 | |         impl_marker!($crate::general::AbstractQuasigroup<$M>; $($T)+);
87 | |     }
88 | | );
   | |__^

warning: unused macro definition
   --> alga/src/general/one_operator.rs:182:1
    |
182 | / macro_rules! impl_loop(
183 | |     (<$M:ty> for $($T:tt)+) => {
184 | |         impl_quasigroup!(<$M> for $($T)+);
185 | |         impl_marker!($crate::general::AbstractLoop<$M>; $($T)+);
186 | |     }
187 | | );
    | |__^

thread 'rustc' panicked at 'assertion failed: `(left != right)`
  left: `ParamEnv(Binder(ProjectionPredicate(ProjectionTy { substs: Slice([<Self as linear::vector::EuclideanSpace>::Coordinates, <Self as linear::vector::EuclideanSpace>::Real]), item_def_id: DefId(2/0:893 ~ core[ffe9]::ops[0]::arith[0]::Mul[0]::Output[0]) }, <Self as linear::vector::EuclideanSpace>::Coordinates)))`,
 right: `ParamEnv(Binder(ProjectionPredicate(ProjectionTy { substs: Slice([<Self as linear::vector::EuclideanSpace>::Coordinates, <Self as linear::vector::EuclideanSpace>::Real]), item_def_id: DefId(2/0:893 ~ core[ffe9]::ops[0]::arith[0]::Mul[0]::Output[0]) }, <Self as linear::vector::EuclideanSpace>::Coordinates)))`', librustc/traits/project.rs:146:17
stack backtrace:
       Fresh aho-corasick v0.5.3
   Compiling rand v0.3.22
     Running `rustc --crate-name rand /home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/rand-0.3.22/src/lib.rs --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=cdfe1b40051a65c0 -C extra-filename=-cdfe1b40051a65c0 --out-dir /home/roger/alga/target/debug/deps -L dependency=/home/roger/alga/target/debug/deps --extern libc=/home/roger/alga/target/debug/deps/liblibc-82c069f3a2b79d60.rlib --extern rand=/home/roger/alga/target/debug/deps/librand-b4a86ac63f7e2602.rlib --cap-lints allow`
   0:     0x7f1be23fc083 - std::sys::unix::backtrace::tracing::imp::unwind_backtrace::hc40e1d8049414718
                               at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1:     0x7f1be23f35c4 - std::sys_common::backtrace::_print::hf0e087caed6cb7b0
                               at libstd/sys_common/backtrace.rs:71
   2:     0x7f1be23f8d0d - std::panicking::default_hook::{{closure}}::h51b503c8121f2e1c
                               at libstd/sys_common/backtrace.rs:59
                               at libstd/panicking.rs:206
   3:     0x7f1be23f8a09 - std::panicking::default_hook::h92f8d7a75f029a40
                               at libstd/panicking.rs:222
   4:     0x7f1bdee728dd - core::ops::function::Fn::call::h6f1946f7b82ebda6
   5:     0x7f1be23f91a9 - std::panicking::rust_panic_with_hook::hd9e2db57fe6c41ab
                               at libstd/panicking.rs:401
   6:     0x7f1be23f8f92 - std::panicking::begin_panic_fmt::he73ce2d8bf11fd27
                               at libstd/panicking.rs:347
   7:     0x7f1bdf1847e2 - rustc::traits::project::ProjectionTyCandidateSet::push_candidate::ha024fea861181222
   8:     0x7f1bdf188dd2 - rustc::traits::project::opt_normalize_projection_type::h02002e97c58b49f0
   9:     0x7f1bdf187d43 - rustc::traits::project::normalize_projection_type::h5e7902796a371a8d
  10:     0x7f1bdf18762c - <rustc::traits::project::AssociatedTypeNormalizer<'a, 'b, 'gcx, 'tcx> as rustc::ty::fold::TypeFolder<'gcx, 'tcx>>::fold_ty::he381d91bc09bdb67
  11:     0x7f1bdf20e43a - rustc::ty::subst::<impl rustc::ty::fold::TypeFoldable<'tcx> for &'tcx rustc::ty::Slice<rustc::ty::subst::Kind<'tcx>>>::super_fold_with::ha71b815487303d31
  12:     0x7f1bdf235bae - rustc::ty::structural_impls::<impl rustc::ty::fold::TypeFoldable<'tcx> for rustc::ty::Predicate<'tcx>>::super_fold_with::hea4902f777d2175b
  13:     0x7f1bdf1b429c - rustc::traits::structural_impls::<impl rustc::ty::fold::TypeFoldable<'tcx> for rustc::traits::Obligation<'tcx, O>>::super_fold_with::h1ba5b2b2fe1621e4
  14:     0x7f1bdf186a22 - rustc::traits::project::normalize_with_depth::hf81b47cb9116b1c3
  15:     0x7f1bdf211c42 - rustc::ty::wf::WfPredicates::normalize::{{closure}}::h71ad22c86f3c0522
  16:     0x7f1bdefd6999 - <core::iter::FlattenCompat<I, U> as core::iter::iterator::Iterator>::next::h94fe5fc1c26c92de
  17:     0x7f1bdee603d7 - <alloc::vec::Vec<T>>::extend_desugared::h8b4f0c1acfe220ed
  18:     0x7f1bdefccbd2 - <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter::h6837c8edade6e005
  19:     0x7f1bdf211a34 - rustc::ty::wf::predicate_obligations::h9c1277faf834c873
  20:     0x7f1be10945b3 - rustc_typeck::check::wfcheck::CheckTypeWellFormedVisitor::check_where_clauses::h1041071718cea538
  21:     0x7f1be108c8d3 - rustc_typeck::check::wfcheck::CheckTypeWellFormedVisitor::check_item_well_formed::hf288ce8ced63b0b9
  22:     0x7f1be10957a8 - <rustc_typeck::check::wfcheck::CheckTypeWellFormedVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'v>>::visit_item::h1c404553f56c4f6d
  23:     0x7f1be10fda88 - rustc_typeck::check_crate::{{closure}}::he4ecaea81fbca6c0
  24:     0x7f1be10f979c - rustc_typeck::check_crate::ha126f305510d32a8
  25:     0x7f1be27454c9 - rustc::ty::context::TyCtxt::create_and_enter::hd9afe302f04a8060
  26:     0x7f1be27a652e - rustc_driver::driver::compile_input::hf08ee19e2779d9bb
  27:     0x7f1be27c2c5a - rustc_driver::run_compiler::hb8a2a908a67aef0b
  28:     0x7f1be26ee6ea - std::sys_common::backtrace::__rust_begin_short_backtrace::hf2003ffe9c7c219d
  29:     0x7f1be2411c6e - __rust_maybe_catch_panic
                               at libpanic_unwind/lib.rs:102
  30:     0x7f1be2727936 - <F as alloc::boxed::FnBox<A>>::call_box::h6eec575c3921fe72
  31:     0x7f1be240902b - std::sys::unix::thread::Thread::new::thread_start::h2d04eaf7b6bb3a88
                               at /checkout/src/liballoc/boxed.rs:793
                               at libstd/sys_common/thread.rs:24
                               at libstd/sys/unix/thread.rs:90
  32:     0x7f1bdd2f76b9 - start_thread
  33:     0x7f1be20ca3dc - clone
  34:                0x0 - <unknown>
   Compiling compiletest_rs v0.2.10
     Running `rustc --crate-name compiletest_rs /home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.2.10/src/lib.rs --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=afc0fa449a30a718 -C extra-filename=-afc0fa449a30a718 --out-dir /home/roger/alga/target/debug/deps -L dependency=/home/roger/alga/target/debug/deps --extern rustc_serialize=/home/roger/alga/target/debug/deps/librustc_serialize-b181cb2d64ae0c9e.rlib --extern log=/home/roger/alga/target/debug/deps/liblog-744c229531176343.rlib --cap-lints allow`

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 1.26.0-nightly (322d7f7b9 2018-02-25) running on x86_64-unknown-linux-gnu

error: Could not compile `alga`.

Caused by:
  process didn't exit successfully: `rustc --crate-name alga alga/src/lib.rs --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=7d8a4bc96630a5c1 -C extra-filename=-7d8a4bc96630a5c1 --out-dir /home/roger/alga/target/debug/deps -C incremental=/home/roger/alga/target/debug/incremental -L dependency=/home/roger/alga/target/debug/deps --extern num_complex=/home/roger/alga/target/debug/deps/libnum_complex-070709ff52c451f1.rlib --extern approx=/home/roger/alga/target/debug/deps/libapprox-c539f28333436395.rlib --extern num_traits=/home/roger/alga/target/debug/deps/libnum_traits-40976005af172ca0.rlib` (exit code: 101)
warning: build failed, waiting for other jobs to finish...
error[E0432]: unresolved import `test::TestPaths`
  --> /home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.2.10/src/lib.rs:34:5
   |
34 | use test::TestPaths;
   |     ^^^^^^^^^^^^^^^ no `TestPaths` in the root. Did you mean to use `TestOpts`?

error[E0432]: unresolved import `test::TestPaths`
  --> /home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.2.10/src/runtest.rs:20:5
   |
20 | use test::TestPaths;
   |     ^^^^^^^^^^^^^^^ no `TestPaths` in the root. Did you mean to use `TestOpts`?

error[E0560]: struct `test::TestOpts` has no field named `quiet`
   --> /home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.2.10/src/lib.rs:100:9
    |
100 |         quiet: config.quiet,
    |         ^^^^^^ `test::TestOpts` does not have this field
    |
    = note: available fields are: `list`, `filter`, `filter_exact`, `run_ignored`, `run_tests` ... and 8 others

error[E0593]: closure is expected to take 0 arguments, but it takes a single 0-tuple as argument
   --> /home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.2.10/src/lib.rs:263:21
    |
263 |       test::DynTestFn(Box::new(move |()| {
    |                       ^        --------- takes a single 0-tuple as argument
    |  _____________________|
    | |
264 | |         runtest::run(config, &testpaths)
265 | |     }))
    | |______^ expected closure that takes 0 arguments
    |
    = note: required because of the requirements on the impl of `std::boxed::FnBox<()>` for `[closure@/home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.2.10/src/lib.rs:263:30: 265:6 config:_, testpaths:_]`
    = note: required for the cast to the object type `std::boxed::FnBox<(), Output=()> + std::marker::Send`
help: change the closure to take multiple arguments instead of a single tuple
    |
263 |     test::DynTestFn(Box::new(|| {
    |                              ^^

error: aborting due to 4 previous errors

error: Could not compile `compiletest_rs`.

Caused by:
  process didn't exit successfully: `rustc --crate-name compiletest_rs /home/roger/.cargo/registry/src/github.com-1ecc6299db9ec823/compiletest_rs-0.2.10/src/lib.rs --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=afc0fa449a30a718 -C extra-filename=-afc0fa449a30a718 --out-dir /home/roger/alga/target/debug/deps -L dependency=/home/roger/alga/target/debug/deps --extern rustc_serialize=/home/roger/alga/target/debug/deps/librustc_serialize-b181cb2d64ae0c9e.rlib --extern log=/home/roger/alga/target/debug/deps/liblog-744c229531176343.rlib --cap-lints allow` (exit code: 101)

[Antti]

I have the same issue. I think it might be related to #48296

rustc 1.26.0-nightly (322d7f7b9 2018-02-25)
binary: rustc
commit-hash: 322d7f7b97f1672bade31e1c43d5753e0e45a1a8
commit-date: 2018-02-25
host: x86_64-apple-darwin
release: 1.26.0-nightly
LLVM version: 6.0

[ishitatsuyuki]

Duplicate of #48551, I'm currently investigating.