[INFO] cloning repository https://github.com/vroland/mfnf-export
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vroland/mfnf-export" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvroland%2Fmfnf-export", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvroland%2Fmfnf-export'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9cb12bb9efddb477c78c8de74c67555525bf15d4
[INFO] checking vroland/mfnf-export against try#81275a1445c7502a974118e0c69b795ab60be991 for pr-80243
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvroland%2Fmfnf-export" "/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/vroland/mfnf-export on toolchain 81275a1445c7502a974118e0c69b795ab60be991
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vroland/mfnf-export
[INFO] finished tweaking git repo https://github.com/vroland/mfnf-export
[INFO] tweaked toml for git repo https://github.com/vroland/mfnf-export written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/vroland/mfnf-export already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/serlo/mfnf-sitemap-parser`
[INFO] [stderr]     Updating git repository `https://github.com/serlo/mfnf-template-spec`
[INFO] [stderr]     Updating git repository `https://github.com/serlo/mediawiki-parser-utils`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mediawiki_parser v0.4.2
[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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "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] 5e608bca61254a42f96f2287ae03667c922e37eb45bad8a7b630b664e3ec3d6c
[INFO] running `Command { std: "docker" "start" "-a" "5e608bca61254a42f96f2287ae03667c922e37eb45bad8a7b630b664e3ec3d6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5e608bca61254a42f96f2287ae03667c922e37eb45bad8a7b630b664e3ec3d6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e608bca61254a42f96f2287ae03667c922e37eb45bad8a7b630b664e3ec3d6c", kill_on_drop: false }`
[INFO] [stdout] 5e608bca61254a42f96f2287ae03667c922e37eb45bad8a7b630b664e3ec3d6c
[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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 14ae5bfec8852133fad5255b2be2f8fbea6d206600bfc2843857af8bb8acda86
[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" "14ae5bfec8852133fad5255b2be2f8fbea6d206600bfc2843857af8bb8acda86", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.26
[INFO] [stderr]    Compiling serde v1.0.85
[INFO] [stderr]    Compiling linked-hash-map v0.5.1
[INFO] [stderr]    Compiling dtoa v0.4.3
[INFO] [stderr]    Compiling libc v0.2.48
[INFO] [stderr]     Checking strsim v0.7.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking lazy_static v1.2.0
[INFO] [stderr]     Checking itoa v0.4.3
[INFO] [stderr]    Compiling peg v0.5.7
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking textwrap v0.10.0
[INFO] [stderr]     Checking yaml-rust v0.4.2
[INFO] [stderr]     Checking ryu v0.2.7
[INFO] [stderr]     Checking colored v1.7.0
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking serde_yaml v0.8.8
[INFO] [stderr]     Checking serde_json v1.0.37
[INFO] [stderr]    Compiling serde_derive v1.0.85
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[INFO] [stderr]    Compiling serde_yaml v0.7.5
[INFO] [stderr]     Checking structopt v0.2.14
[INFO] [stderr]    Compiling mediawiki_parser v0.4.2
[INFO] [stderr]    Compiling mwparser_utils_derive v0.1.0 (https://github.com/vroland/mediawiki-parser-utils#67c63573)
[INFO] [stderr]    Compiling mwparser_utils_derive v0.1.0 (https://github.com/serlo/mediawiki-parser-utils#67c63573)
[INFO] [stderr] error: failed to run custom build command for `mediawiki_parser v0.4.2`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/mediawiki_parser-b12cc2131afd8156/build-script-build` (exit code: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:rerun-if-changed=src/grammar.rustpeg
[INFO] [stderr]   cargo:rerun-if-changed=doc/docs.yml
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'attempted to leave type `linked_hash_map::Node<yaml::Yaml, yaml::Yaml>` uninitialized, which is invalid', /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/core/src/mem/mod.rs:659:9
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55fcd4d01287 - std::backtrace_rs::backtrace::libunwind::trace::h746c3e9529d524bc
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stderr]      1:     0x55fcd4d01287 - std::backtrace_rs::backtrace::trace_unsynchronized::h84373278bfb39e0c
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x55fcd4d01287 - std::sys_common::backtrace::_print_fmt::h517324efde750597
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]      3:     0x55fcd4d01287 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf594ab77fac89284
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stderr]      4:     0x55fcd4d1e9ac - core::fmt::write::h3868db8542c90941
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/core/src/fmt/mod.rs:1078:17
[INFO] [stderr]      5:     0x55fcd4cfe3c2 - std::io::Write::write_fmt::h3f6656f045fa877f
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/io/mod.rs:1519:15
[INFO] [stderr]      6:     0x55fcd4d03015 - std::sys_common::backtrace::_print::hda7655c057c24dcc
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stderr]      7:     0x55fcd4d03015 - std::sys_common::backtrace::print::h546a6c8431d46287
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stderr]      8:     0x55fcd4d03015 - std::panicking::default_hook::{{closure}}::h006dd083853faf51
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/panicking.rs:208:50
[INFO] [stderr]      9:     0x55fcd4d02b6a - std::panicking::default_hook::hf0f9afb1017317fc
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/panicking.rs:225:9
[INFO] [stderr]     10:     0x55fcd4d037b1 - std::panicking::rust_panic_with_hook::hb7a19826c029b1d6
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/panicking.rs:591:17
[INFO] [stderr]     11:     0x55fcd4d032c7 - std::panicking::begin_panic_handler::{{closure}}::hde71edcd925d0c5e
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/panicking.rs:495:13
[INFO] [stderr]     12:     0x55fcd4d0174c - std::sys_common::backtrace::__rust_end_short_backtrace::h8a3c7d6cea578919
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stderr]     13:     0x55fcd4d03259 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/panicking.rs:493:5
[INFO] [stderr]     14:     0x55fcd4d1d361 - core::panicking::panic_fmt::h20225113c4a2f8fd
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/core/src/panicking.rs:92:14
[INFO] [stderr]     15:     0x55fcd4d1d2ad - core::panicking::panic::h35b77276aa4b0c12
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/core/src/panicking.rs:50:5
[INFO] [stderr]     16:     0x55fcd4c59413 - core::mem::uninitialized::h8dfaeb81094e7fa1
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/core/src/mem/mod.rs:659:9
[INFO] [stderr]     17:     0x55fcd4c59413 - linked_hash_map::LinkedHashMap<K,V,S>::ensure_guard_node::h151c8858b604c549
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/linked-hash-map-0.5.1/src/lib.rs:174:52
[INFO] [stderr]     18:     0x55fcd4c59667 - linked_hash_map::LinkedHashMap<K,V,S>::insert::h17ec4c644e93f7e6
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/linked-hash-map-0.5.1/src/lib.rs:304:9
[INFO] [stderr]     19:     0x55fcd4bdd25f - <serde_yaml::ser::SerializeStruct as serde::ser::SerializeStruct>::serialize_field::hb4be0d65ab374a92
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_yaml-0.8.8/src/ser.rs:371:9
[INFO] [stderr]     20:     0x55fcd4c1a0af - <serde::private::ser::TaggedSerializer<S> as serde::ser::Serializer>::serialize_struct::h2e53028f9b08a3fe
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde-1.0.85/src/private/ser.rs:294:14
[INFO] [stderr]     21:     0x55fcd4b9f4c7 - build_script_build::ast::_IMPL_SERIALIZE_FOR_Document::<impl serde::ser::Serialize for build_script_build::ast::Document>::serialize::h9cd10cee4d004a57
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/src/ast.rs:37:17
[INFO] [stderr]     22:     0x55fcd4c19818 - serde::private::ser::serialize_tagged_newtype::ha5d4df43bc26dcbe
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde-1.0.85/src/private/ser.rs:29:5
[INFO] [stderr]     23:     0x55fcd4ba2c82 - build_script_build::ast::_IMPL_SERIALIZE_FOR_Element::<impl serde::ser::Serialize for build_script_build::ast::Element>::serialize::h1eec910ec19749ce
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/src/ast.rs:13:17
[INFO] [stderr]     24:     0x55fcd4b7b388 - serde::ser::impls::<impl serde::ser::Serialize for &T>::serialize::h2f7030d0ff3bff03
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde-1.0.85/src/ser/impls.rs:365:17
[INFO] [stderr]     25:     0x55fcd4bda0aa - serde_yaml::ser::to_yaml::h9d89de2d2b71cde8
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_yaml-0.8.8/src/ser.rs:460:5
[INFO] [stderr]     26:     0x55fcd4bda3ec - serde_yaml::ser::to_writer::h52a8ea9b53f60a58
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_yaml-0.8.8/src/ser.rs:406:15
[INFO] [stderr]     27:     0x55fcd4bd9d12 - serde_yaml::ser::to_vec::hf7d43470fe92acc6
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_yaml-0.8.8/src/ser.rs:423:5
[INFO] [stderr]     28:     0x55fcd4bda1fc - serde_yaml::ser::to_string::h0877cc0b9857bb6c
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_yaml-0.8.8/src/ser.rs:435:26
[INFO] [stderr]     29:     0x55fcd4c1a3f3 - build_script_build::Test::write_code::h35b61aa1b45b803b
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:68:13
[INFO] [stderr]     30:     0x55fcd4c1ace6 - build_script_build::generate_tests::h4cd5354ca04cad71
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:102:9
[INFO] [stderr]     31:     0x55fcd4c1aeaa - build_script_build::main::h3d157233fb76410e
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:108:5
[INFO] [stderr]     32:     0x55fcd4bd3ddb - core::ops::function::FnOnce::call_once::h3df86c51456e2f1a
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/core/src/ops/function.rs:227:5
[INFO] [stderr]     33:     0x55fcd4c0b49e - std::sys_common::backtrace::__rust_begin_short_backtrace::h5afba639eb0c07ea
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stderr]     34:     0x55fcd4bddc91 - std::rt::lang_start::{{closure}}::h8639c13916b491ff
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/rt.rs:66:18
[INFO] [stderr]     35:     0x55fcd4d03bd7 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h54c39b9b8451875a
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/core/src/ops/function.rs:259:13
[INFO] [stderr]     36:     0x55fcd4d03bd7 - std::panicking::try::do_call::hcdfba51a06e21b42
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/panicking.rs:379:40
[INFO] [stderr]     37:     0x55fcd4d03bd7 - std::panicking::try::h77386c66889b2066
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/panicking.rs:343:19
[INFO] [stderr]     38:     0x55fcd4d03bd7 - std::panic::catch_unwind::hc55a0d8aadca44f0
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/panic.rs:396:14
[INFO] [stderr]     39:     0x55fcd4d03bd7 - std::rt::lang_start_internal::h97dca9624db2aa85
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/rt.rs:51:25
[INFO] [stderr]     40:     0x55fcd4bddc67 - std::rt::lang_start::hb9ebf8c8696c5acd
[INFO] [stderr]                                  at /rustc/81275a1445c7502a974118e0c69b795ab60be991/library/std/src/rt.rs:65:5
[INFO] [stderr]     41:     0x55fcd4c1c6ba - main
[INFO] [stderr]     42:     0x7f60396290b3 - __libc_start_main
[INFO] [stderr]     43:     0x55fcd4b770ae - _start
[INFO] [stderr]     44:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "14ae5bfec8852133fad5255b2be2f8fbea6d206600bfc2843857af8bb8acda86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14ae5bfec8852133fad5255b2be2f8fbea6d206600bfc2843857af8bb8acda86", kill_on_drop: false }`
[INFO] [stdout] 14ae5bfec8852133fad5255b2be2f8fbea6d206600bfc2843857af8bb8acda86