[INFO] cloning repository https://github.com/perlindgren/array_list
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/perlindgren/array_list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperlindgren%2Farray_list", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperlindgren%2Farray_list'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 968b3d2e58566fdad8e28f94f8565f2495200922
[INFO] checking perlindgren/array_list against try#72f88fc4e9458f89516a0b8b0868f3718aec5b47 for pr-74989
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperlindgren%2Farray_list" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/perlindgren/array_list on toolchain 72f88fc4e9458f89516a0b8b0868f3718aec5b47
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/perlindgren/array_list
[INFO] finished tweaking git repo https://github.com/perlindgren/array_list
[INFO] tweaked toml for git repo https://github.com/perlindgren/array_list written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/perlindgren/array_list already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c3cc70234f1b569eb9598fe610e7fca73aa7890fa0912b11805254dd236d3298
[INFO] running `Command { std: "docker" "start" "-a" "c3cc70234f1b569eb9598fe610e7fca73aa7890fa0912b11805254dd236d3298", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c3cc70234f1b569eb9598fe610e7fca73aa7890fa0912b11805254dd236d3298", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3cc70234f1b569eb9598fe610e7fca73aa7890fa0912b11805254dd236d3298", kill_on_drop: false }`
[INFO] [stdout] c3cc70234f1b569eb9598fe610e7fca73aa7890fa0912b11805254dd236d3298
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 845765e0bee0bf161c39d9bda489c0bccbe881ab539775de5d408a44dddea3fc
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "845765e0bee0bf161c39d9bda489c0bccbe881ab539775de5d408a44dddea3fc", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking array_list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] thread 'rustc' panicked at 'assertion failed: promoted.is_none()', compiler/rustc_mir/src/transform/check_consts/qualifs.rs:248:9
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x7fa3331cc4b0 - std::backtrace_rs::backtrace::libunwind::trace::h452faf99f32e7c93
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stderr]    1:     0x7fa3331cc4b0 - std::backtrace_rs::backtrace::trace_unsynchronized::he40edc71437667a1
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/../../backtrace/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x7fa3331cc4b0 - std::sys_common::backtrace::_print_fmt::h6c51d6ade71f46bf
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:79
[INFO] [stderr]    3:     0x7fa3331cc4b0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3cd15d7003dec37a
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:58
[INFO] [stderr]    4:     0x7fa33323ae4c - core::fmt::write::h1857a60b204f1b6a
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/core/src/fmt/mod.rs:1080
[INFO] [stderr]    5:     0x7fa3331be887 - std::io::Write::write_fmt::hac61caff894c35ae
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/io/mod.rs:1517
[INFO] [stderr]    6:     0x7fa3331d1190 - std::sys_common::backtrace::_print::haa2f390fb7957e3e
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:61
[INFO] [stderr]    7:     0x7fa3331d1190 - std::sys_common::backtrace::print::h48c7cbbad9013bb1
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:48
[INFO] [stderr]    8:     0x7fa3331d1190 - std::panicking::default_hook::{{closure}}::h8b7ff05a31e71d55
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:208
[INFO] [stderr]    9:     0x7fa3331d0edc - std::panicking::default_hook::h2f00c78800d98e4c
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:227
[INFO] [stdout] warning: associated function is never used: `free`
[INFO] [stdout]   --> src/main.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn free(&mut self, i: u8) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/main.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 |     fn push(&mut self, v: T) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/main.rs:92:8
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn pop(&mut self) -> T {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free`
[INFO] [stdout]   --> src/main.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn free(&mut self, i: u8) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/main.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 |     fn push(&mut self, v: T) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/main.rs:92:8
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn pop(&mut self) -> T {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   10:     0x7fa333a4df58 - rustc_driver::report_ice::hd736bea9ad59b02a
[INFO] [stderr]   11:     0x7fa3331d1938 - std::panicking::rust_panic_with_hook::h4eaa635e4694aef3
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:581
[INFO] [stderr]   12:     0x7fa335358f54 - std::panicking::begin_panic::{{closure}}::he6bb1ff5f9839a96
[INFO] [stderr]   13:     0x7fa335358e5c - std::sys_common::backtrace::__rust_end_short_backtrace::h15199a379c5cb7cb
[INFO] [stderr]   14:     0x7fa3351550dc - std::panicking::begin_panic::hec09ada98abe8d29
[INFO] [stderr]   15:     0x7fa334ecc7f3 - rustc_mir::transform::check_consts::qualifs::in_operand::h48d1b4d47afd686c
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |         write!(f, "List :");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   16:     0x7fa334feb989 - rustc_mir::transform::promote_consts::Validator::qualif_local::hfcf70eb809fe0ce9
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:118:13
[INFO] [stdout]     |
[INFO] [stdout] 118 |             write!(f, "{:?}, ", self.nodes[i as usize].data);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   17:     0x7fa334fec823 - rustc_mir::transform::promote_consts::Validator::validate_local::h0d7755eaa9a090e2
[INFO] [stderr]   18:     0x7fa334fec808 - rustc_mir::transform::promote_consts::Validator::validate_local::h0d7755eaa9a090e2
[INFO] [stderr]   19:     0x7fa334fec50c - rustc_mir::transform::promote_consts::Validator::validate_local::h0d7755eaa9a090e2
[INFO] [stderr]   20:     0x7fa334ff01e5 - rustc_mir::transform::promote_consts::should_suggest_const_in_array_repeat_expressions_attribute::h2f5d7143f73e24f6
[INFO] [stderr]   21:     0x7fa33538c0aa - rustc_mir::borrow_check::type_check::TypeChecker::check_rvalue::ha10edd1d651442c5
[INFO] [stderr]   22:     0x7fa33538fba1 - rustc_mir::borrow_check::type_check::TypeChecker::typeck_mir::hc49600b870ef6b43
[INFO] [stderr]   23:     0x7fa335382980 - rustc_mir::borrow_check::type_check::type_check::h8f1e1e3dd69c33e3
[INFO] [stderr]   24:     0x7fa3350b6afa - rustc_mir::borrow_check::nll::compute_regions::hf5adb3dcf28cbef9
[INFO] [stderr]   25:     0x7fa3352a544c - rustc_mir::borrow_check::do_mir_borrowck::hddbefddba5d20fbd
[INFO] [stderr]   26:     0x7fa334fff281 - rustc_infer::infer::InferCtxtBuilder::enter::h2e7bcae2d2295dd6
[INFO] [stderr]   27:     0x7fa3352a46cf - rustc_mir::borrow_check::mir_borrowck::h01e0785917d3dcc8
[INFO] [stderr]   28:     0x7fa33526fcbc - core::ops::function::FnOnce::call_once::hbd37f563c14c44d4
[INFO] [stderr]   29:     0x7fa333d88395 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_borrowck>::compute::ha777b9a6e1cf551d
[INFO] [stderr]   30:     0x7fa333d2af17 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h53c9ae21c978d25c
[INFO] [stderr]   31:     0x7fa333d89293 - rustc_data_structures::stack::ensure_sufficient_stack::h366dbe732a0bb3e5
[INFO] [stderr]   32:     0x7fa333cf2f83 - rustc_query_system::query::plumbing::get_query_impl::hcfd88185567c1182
[INFO] [stderr]   33:     0x7fa333cf7599 - rustc_query_system::query::plumbing::ensure_query_impl::hcf2240abf23cf45e
[INFO] [stderr]   34:     0x7fa333d7c2b3 - rustc_interface::passes::analysis::h7affe31f0fab905a
[INFO] [stderr]   35:     0x7fa333a6ce2b - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute::h0646113220fc8337
[INFO] [stderr]   36:     0x7fa333a53737 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::ha94607b8d815d30b
[INFO] [stderr]   37:     0x7fa333a5f283 - rustc_data_structures::stack::ensure_sufficient_stack::h23a4c058b4f14bb2
[INFO] [stderr]   38:     0x7fa3339f2c5e - rustc_query_system::query::plumbing::get_query_impl::h84cc805d949a9399
[INFO] [stderr]   39:     0x7fa333a70bdf - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h90754b37c2a5c90c
[INFO] [stderr]   40:     0x7fa333a030e7 - rustc_span::with_source_map::he52d2e0c6177f287
[INFO] [stderr]   41:     0x7fa333a72848 - rustc_interface::interface::create_compiler_and_run::h80874578e642ac73
[INFO] [stderr]   42:     0x7fa333a513ca - scoped_tls::ScopedKey<T>::set::h7e0a01d39c8551cf
[INFO] [stderr]   43:     0x7fa333a60e97 - std::sys_common::backtrace::__rust_begin_short_backtrace::hd515bf0a4768efd9
[INFO] [stderr]   44:     0x7fa3339ed1ee - core::ops::function::FnOnce::call_once{{vtable.shim}}::hc776a06d7e45ba64
[INFO] [stderr]   45:     0x7fa3331e0eda - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h12eb11286d55ef7c
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/alloc/src/boxed.rs:1042
[INFO] [stderr]   46:     0x7fa3331e0eda - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h7a8834e2603fbb01
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/alloc/src/boxed.rs:1042
[INFO] [stderr]   47:     0x7fa3331e0eda - std::sys::unix::thread::Thread::new::thread_start::h0afd1709a500dd5c
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys/unix/thread.rs:87
[INFO] [stderr]   48:     0x7fa3330fe609 - start_thread
[INFO] [stderr]   49:     0x7fa333012103 - clone
[INFO] [stderr]   50:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] [stderr] error: internal compiler error: unexpected panic
[INFO] [stderr] 
[INFO] [stderr] note: the compiler unexpectedly panicked. this is a bug.
[INFO] [stderr] 
[INFO] [stderr] 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
[INFO] [stderr] 
[INFO] [stderr] note: rustc 1.48.0-nightly (72f88fc4e 2020-09-04) running on x86_64-unknown-linux-gnu
[INFO] [stderr] 
[INFO] [stderr] note: compiler flags: -C embed-bitcode=no -C debuginfo=2 --crate-type bin
[INFO] [stderr] 
[INFO] [stderr] note: some of the compiler flags provided by cargo are hidden
[INFO] [stderr] 
[INFO] [stderr] query stack during panic:
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |         write!(f, "List :");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:118:13
[INFO] [stdout]     |
[INFO] [stdout] 118 |             write!(f, "{:?}, ", self.nodes[i as usize].data);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] #0 [mir_borrowck] borrow-checking `A`
[INFO] [stderr] #1 [analysis] running analysis passes on this crate
[INFO] [stderr] end of query stack
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `array_list`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "845765e0bee0bf161c39d9bda489c0bccbe881ab539775de5d408a44dddea3fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "845765e0bee0bf161c39d9bda489c0bccbe881ab539775de5d408a44dddea3fc", kill_on_drop: false }`
[INFO] [stdout] 845765e0bee0bf161c39d9bda489c0bccbe881ab539775de5d408a44dddea3fc
