[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 master#7f5a42b073dc2bee2aa625052eb066ee07072048 for pr-78991 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperlindgren%2Farray_list" "/workspace/builds/worker-4/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/perlindgren/array_list on toolchain 7f5a42b073dc2bee2aa625052eb066ee07072048 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "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-4/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" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 69cb287933008966e521fcfdb499040c087c8e1bb8fbe0e6b94b061d08a435cd [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" "69cb287933008966e521fcfdb499040c087c8e1bb8fbe0e6b94b061d08a435cd", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "69cb287933008966e521fcfdb499040c087c8e1bb8fbe0e6b94b061d08a435cd", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "69cb287933008966e521fcfdb499040c087c8e1bb8fbe0e6b94b061d08a435cd", kill_on_drop: false }` [INFO] [stdout] 69cb287933008966e521fcfdb499040c087c8e1bb8fbe0e6b94b061d08a435cd [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] e5c878ef3c5a19354ae2eb58393b65dcaa1447a8d5775580eabe4b075f3629ff [INFO] running `Command { std: "docker" "start" "-a" "e5c878ef3c5a19354ae2eb58393b65dcaa1447a8d5775580eabe4b075f3629ff", kill_on_drop: false }` [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: 0x7fb09ee00e20 - std::backtrace_rs::backtrace::libunwind::trace::h448c56741b6011d3 [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/../../backtrace/src/backtrace/libunwind.rs:100:5 [INFO] [stderr] 1: 0x7fb09ee00e20 - std::backtrace_rs::backtrace::trace_unsynchronized::h2d26397c5720fdbb [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 [INFO] [stderr] 2: 0x7fb09ee00e20 - std::sys_common::backtrace::_print_fmt::h720a2f61f75b9f58 [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/sys_common/backtrace.rs:67:5 [INFO] [stderr] 3: 0x7fb09ee00e20 - ::fmt::h8d62bbfda6d5c836 [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/sys_common/backtrace.rs:46:22 [INFO] [stderr] 4: 0x7fb09ee7131c - core::fmt::write::h1857a60b204f1b6a [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/core/src/fmt/mod.rs:1078:17 [INFO] [stderr] 5: 0x7fb09edf2a82 - std::io::Write::write_fmt::h16a9fe7680ac245c [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/io/mod.rs:1518:15 [INFO] [stderr] 6: 0x7fb09ee05e85 - std::sys_common::backtrace::_print::h9ba51a6db618de7d [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/sys_common/backtrace.rs:49:5 [INFO] [stderr] 7: 0x7fb09ee05e85 - std::sys_common::backtrace::print::h5f20e41c85e91716 [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/sys_common/backtrace.rs:36:9 [INFO] [stderr] 8: 0x7fb09ee05e85 - std::panicking::default_hook::{{closure}}::h5b7294ca19e8edab [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/panicking.rs:208:50 [INFO] [stderr] 9: 0x7fb09ee05b28 - std::panicking::default_hook::hb3948d1f74b6ff4c [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/panicking.rs:227:9 [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: 0x7fb09f6e1264 - rustc_driver::report_ice::h7d9ce14184308134 [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] [stderr] 11: 0x7fb09ee06786 - std::panicking::rust_panic_with_hook::h55d23fef0ad751bc [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] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/panicking.rs:597:17 [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] 12: 0x7fb0a0f84674 - std::panicking::begin_panic::{{closure}}::hbf44e1ee28b770a7 [INFO] [stderr] 13: 0x7fb0a0f845bc - std::sys_common::backtrace::__rust_end_short_backtrace::hac528b2762bcb2fe [INFO] [stderr] 14: 0x7fb0a0ed5afc - std::panicking::begin_panic::hf84a3f6998c603fc [INFO] [stderr] 15: 0x7fb0a0befeca - rustc_mir::transform::check_consts::qualifs::in_operand::h3a52401e9ebd20ea [INFO] [stderr] 16: 0x7fb0a0a11809 - rustc_mir::transform::promote_consts::Validator::qualif_local::he52c62efbd1bcb6f [INFO] [stderr] 17: 0x7fb0a0a1261a - rustc_mir::transform::promote_consts::Validator::validate_local::hd20015d0b79ccbd3 [INFO] [stderr] 18: 0x7fb0a0a125ff - rustc_mir::transform::promote_consts::Validator::validate_local::hd20015d0b79ccbd3 [INFO] [stderr] 19: 0x7fb0a0a122d6 - rustc_mir::transform::promote_consts::Validator::validate_local::hd20015d0b79ccbd3 [INFO] [stderr] 20: 0x7fb0a0a17985 - rustc_mir::transform::promote_consts::should_suggest_const_in_array_repeat_expressions_attribute::h4a73ac0b68cabd94 [INFO] [stderr] 21: 0x7fb0a0ab6263 - rustc_mir::borrow_check::type_check::TypeChecker::check_rvalue::h40675d7d5306d4e4 [INFO] [stderr] 22: 0x7fb0a0ab9cfd - rustc_mir::borrow_check::type_check::TypeChecker::typeck_mir::hc5ba18cbf7ef4b9b [INFO] [stderr] 23: 0x7fb0a0aac441 - rustc_mir::borrow_check::type_check::type_check::h3515adac7fe94af1 [INFO] [stderr] 24: 0x7fb0a0dba88f - rustc_mir::borrow_check::nll::compute_regions::h53f6d6f2a71d7ff0 [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] 25: 0x7fb0a0f13609 - rustc_mir::borrow_check::do_mir_borrowck::h2374f2abdf7739dd [INFO] [stderr] 26: 0x7fb0a09c3786 - rustc_infer::infer::InferCtxtBuilder::enter::h553b4d997f0359c0 [INFO] [stderr] 27: 0x7fb0a0f129c9 - rustc_mir::borrow_check::mir_borrowck::h664a399d59d570cd [INFO] [stderr] 28: 0x7fb0a0ed9d65 - core::ops::function::FnOnce::call_once::ha25e72f7a69f3853 [INFO] [stderr] 29: 0x7fb09f8f828e - rustc_middle::ty::query:: for rustc_middle::ty::query::queries::mir_borrowck>::compute::h6c841798cf6d37f9 [INFO] [stderr] 30: 0x7fb09f89b917 - rustc_query_system::dep_graph::graph::DepGraph::with_task_impl::hc3513552b73a6ffb [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] 31: 0x7fb09f8cfd21 - rustc_data_structures::stack::ensure_sufficient_stack::hb756b6eef86b811f [INFO] [stderr] 32: 0x7fb09f874c73 - rustc_query_system::query::plumbing::get_query_impl::h458ef350c0942635 [INFO] [stderr] 33: 0x7fb09f88f3f9 - rustc_query_system::query::plumbing::ensure_query_impl::h1219e32559e0f8ef [INFO] [stderr] 34: 0x7fb09f8cd5c9 - rustc_session::utils::::time::h99321822b0322bd6 [INFO] [stderr] 35: 0x7fb09f91bae2 - rustc_interface::passes::analysis::h0297dc70c5f42ca2 [INFO] [stderr] 36: 0x7fb09f719c42 - rustc_middle::ty::query:: for rustc_middle::ty::query::queries::analysis>::compute::h483a2b5cb9981507 [INFO] [stderr] 37: 0x7fb09f6f8f67 - rustc_query_system::dep_graph::graph::DepGraph::with_task_impl::h5dab9677a1869822 [INFO] [stderr] 38: 0x7fb09f6fc3a0 - rustc_data_structures::stack::ensure_sufficient_stack::hef1bfd0aeb694af5 [INFO] [stderr] 39: 0x7fb09f68b430 - rustc_query_system::query::plumbing::get_query_impl::hc8aa257a6f276f4a [INFO] [stderr] 40: 0x7fb09f71d13f - rustc_interface::passes::QueryContext::enter::hf64e301c55abd329 [INFO] [stderr] 41: 0x7fb09f6f5cde - rustc_interface::queries::::enter::ha4de22cb0dda795a [INFO] [stderr] 42: 0x7fb09f6e381e - rustc_span::with_source_map::h29633e90c8bdca16 [INFO] [stderr] 43: 0x7fb09f6f7122 - rustc_interface::interface::create_compiler_and_run::h646ae36fd2c94a87 [INFO] [stderr] 44: 0x7fb09f6e4aca - rustc_span::with_session_globals::hda575f9d899f5c60 [INFO] [stderr] 45: 0x7fb09f6fc99f - std::sys_common::backtrace::__rust_begin_short_backtrace::hc0d91feb93491fb8 [INFO] [stderr] 46: 0x7fb09f664368 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h425334629854e612 [INFO] [stderr] 47: 0x7fb09ee1586a - as core::ops::function::FnOnce>::call_once::h9e7afb7a0a438236 [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/alloc/src/boxed.rs:1307:9 [INFO] [stderr] 48: 0x7fb09ee1586a - as core::ops::function::FnOnce>::call_once::h70c646c4271337a1 [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/alloc/src/boxed.rs:1307:9 [INFO] [stderr] 49: 0x7fb09ee1586a - std::sys::unix::thread::Thread::new::thread_start::h35d2b8d36f210d02 [INFO] [stderr] at /rustc/7f5a42b073dc2bee2aa625052eb066ee07072048/library/std/src/sys/unix/thread.rs:71:17 [INFO] [stderr] 50: 0x7fb09ed31609 - start_thread [INFO] [stderr] 51: 0x7fb09ec45293 - clone [INFO] [stderr] 52: 0x0 - [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 1.49.0-nightly (7f5a42b07 2020-11-12) 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] running `Command { std: "docker" "inspect" "e5c878ef3c5a19354ae2eb58393b65dcaa1447a8d5775580eabe4b075f3629ff", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e5c878ef3c5a19354ae2eb58393b65dcaa1447a8d5775580eabe4b075f3629ff", kill_on_drop: false }` [INFO] [stdout] e5c878ef3c5a19354ae2eb58393b65dcaa1447a8d5775580eabe4b075f3629ff