[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#39e1293fce4b650061e85dda88aa428f726a8444 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvroland%2Fmfnf-export" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vroland/mfnf-export on toolchain 39e1293fce4b650061e85dda88aa428f726a8444
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-6/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" "+39e1293fce4b650061e85dda88aa428f726a8444" "fetch" "--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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "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] 6f53c85016b7dddeca222299a495f594b363f0055482e760c85e381d5cad0faa
[INFO] running `Command { std: "docker" "start" "-a" "6f53c85016b7dddeca222299a495f594b363f0055482e760c85e381d5cad0faa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6f53c85016b7dddeca222299a495f594b363f0055482e760c85e381d5cad0faa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f53c85016b7dddeca222299a495f594b363f0055482e760c85e381d5cad0faa", kill_on_drop: false }`
[INFO] [stdout] 6f53c85016b7dddeca222299a495f594b363f0055482e760c85e381d5cad0faa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 15d2467827c69f45933f141036d49a595835599f3b209a5ff46d54873fbb503b
[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" "15d2467827c69f45933f141036d49a595835599f3b209a5ff46d54873fbb503b", 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]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking bitflags v1.0.4
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]     Checking colored v1.7.0
[INFO] [stderr]     Checking textwrap v0.10.0
[INFO] [stderr]     Checking yaml-rust v0.4.2
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]    Compiling serde_derive v1.0.85
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[INFO] [stderr]     Checking serde_yaml v0.8.8
[INFO] [stderr]     Checking serde_json v1.0.37
[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-67cda159d6db359e/build-script-build` (exit status: 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', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/linked-hash-map-0.5.1/src/lib.rs:174:52
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55c63234c090 - std::backtrace_rs::backtrace::libunwind::trace::h0197874f43e7190f
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stderr]      1:     0x55c63234c090 - std::backtrace_rs::backtrace::trace_unsynchronized::hfdfd566bbbda6f2d
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x55c63234c090 - std::sys_common::backtrace::_print_fmt::hb3b4707c15b032a1
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]      3:     0x55c63234c090 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::had1dceac8b072f88
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stderr]      4:     0x55c63236bbdc - core::fmt::write::h9a6d9c74526a6c1b
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/core/src/fmt/mod.rs:1117:17
[INFO] [stderr]      5:     0x55c632349d25 - std::io::Write::write_fmt::h05c3bb2bc83b8ed0
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/io/mod.rs:1667:15
[INFO] [stderr]      6:     0x55c63234d84b - std::sys_common::backtrace::_print::h10f0826b2a586b58
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stderr]      7:     0x55c63234d84b - std::sys_common::backtrace::print::h0d4242fbd1ac3eb6
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stderr]      8:     0x55c63234d84b - std::panicking::default_hook::{{closure}}::h275ead39fe8b8e2a
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:210:50
[INFO] [stderr]      9:     0x55c63234d3c0 - std::panicking::default_hook::h5505d4d90f5984d9
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:227:9
[INFO] [stderr]     10:     0x55c63234df14 - std::panicking::rust_panic_with_hook::h2f8980d1d9fd4ca0
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:624:17
[INFO] [stderr]     11:     0x55c63234d9c2 - std::panicking::begin_panic_handler::{{closure}}::hd87853ef7e40ae97
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:519:13
[INFO] [stderr]     12:     0x55c63234c594 - std::sys_common::backtrace::__rust_end_short_backtrace::hcab167aa940694a2
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stderr]     13:     0x55c63234d959 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:517:5
[INFO] [stderr]     14:     0x55c6321e2091 - core::panicking::panic_fmt::hcf5f6d96e1dd7099
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/core/src/panicking.rs:93:14
[INFO] [stderr]     15:     0x55c6321e1fdd - core::panicking::panic::hd695e3b1d0dd4ef4
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/core/src/panicking.rs:50:5
[INFO] [stderr]     16:     0x55c6322b096d - core::mem::uninitialized::h810197b8fa2a0796
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/core/src/mem/mod.rs:665:9
[INFO] [stderr]     17:     0x55c6322b096d - linked_hash_map::LinkedHashMap<K,V,S>::ensure_guard_node::hed1b7791890ed31f
[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:     0x55c6322b0b89 - linked_hash_map::LinkedHashMap<K,V,S>::insert::hdaee3ea3bf355d5e
[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:     0x55c6322834b5 - <serde_yaml::ser::SerializeStruct as serde::ser::SerializeStruct>::serialize_field::hb02c403a2c9ce373
[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:     0x55c63227e979 - <serde::private::ser::TaggedSerializer<S> as serde::ser::Serializer>::serialize_struct::h6c01fdad3a07c492
[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:     0x55c632208281 - build_script_build::ast::_IMPL_SERIALIZE_FOR_Document::<impl serde::ser::Serialize for build_script_build::ast::Document>::serialize::hfc3875523f94ff43
[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:     0x55c63227d9a8 - serde::private::ser::serialize_tagged_newtype::h46249169bbe8ed26
[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:     0x55c6322094e7 - build_script_build::ast::_IMPL_SERIALIZE_FOR_Element::<impl serde::ser::Serialize for build_script_build::ast::Element>::serialize::h24d3b0d5a2c1d791
[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:     0x55c6321e6bb8 - serde::ser::impls::<impl serde::ser::Serialize for &T>::serialize::hb52e274506dd833b
[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:     0x55c63227ec6b - serde_yaml::ser::to_yaml::h33b1367fd8a2ec9a
[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:     0x55c63227f249 - serde_yaml::ser::to_writer::hcdd5cd8dd6d52ca0
[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:     0x55c63227eb09 - serde_yaml::ser::to_vec::h215894be72042c93
[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:     0x55c63227f085 - serde_yaml::ser::to_string::h58fb56885db198aa
[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:     0x55c632277578 - build_script_build::Test::write_code::h32c62b5383ea405e
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:68:13
[INFO] [stderr]     30:     0x55c632277f1c - build_script_build::generate_tests::h60ef14007742690e
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:102:9
[INFO] [stderr]     31:     0x55c632277ff7 - build_script_build::main::h6ec8c00c0b15e565
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:108:5
[INFO] [stderr]     32:     0x55c63222d8ab - core::ops::function::FnOnce::call_once::h0cd17e0261e81035
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/core/src/ops/function.rs:227:5
[INFO] [stderr]     33:     0x55c63223912e - std::sys_common::backtrace::__rust_begin_short_backtrace::hb280bc1320a4967a
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stderr]     34:     0x55c632239a91 - std::rt::lang_start::{{closure}}::he11d731a1301a728
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/rt.rs:63:18
[INFO] [stderr]     35:     0x55c63234e41a - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h5e3bbb97afe2bb03
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/core/src/ops/function.rs:259:13
[INFO] [stderr]     36:     0x55c63234e41a - std::panicking::try::do_call::h48c2d717cec4bdcb
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:403:40
[INFO] [stderr]     37:     0x55c63234e41a - std::panicking::try::h2a49bc215893bc14
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:367:19
[INFO] [stderr]     38:     0x55c63234e41a - std::panic::catch_unwind::h6d23b7c99550c7ff
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panic.rs:129:14
[INFO] [stderr]     39:     0x55c63234e41a - std::rt::lang_start_internal::{{closure}}::h251a0c0729f15896
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/rt.rs:45:48
[INFO] [stderr]     40:     0x55c63234e41a - std::panicking::try::do_call::h4830e784a9b9d1ad
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:403:40
[INFO] [stderr]     41:     0x55c63234e41a - std::panicking::try::h0427859d2ad3b3b9
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panicking.rs:367:19
[INFO] [stderr]     42:     0x55c63234e41a - std::panic::catch_unwind::h4079bfb63395be0f
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/panic.rs:129:14
[INFO] [stderr]     43:     0x55c63234e41a - std::rt::lang_start_internal::h408e9d26a25a1f08
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/rt.rs:45:20
[INFO] [stderr]     44:     0x55c632239a60 - std::rt::lang_start::he3dc22e359fe1e94
[INFO] [stderr]                                  at /rustc/39e1293fce4b650061e85dda88aa428f726a8444/library/std/src/rt.rs:62:5
[INFO] [stderr]     45:     0x55c63227957c - main
[INFO] [stderr]     46:     0x7f2373ba60b3 - __libc_start_main
[INFO] [stderr]     47:     0x55c6321e284e - _start
[INFO] [stderr]     48:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "15d2467827c69f45933f141036d49a595835599f3b209a5ff46d54873fbb503b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15d2467827c69f45933f141036d49a595835599f3b209a5ff46d54873fbb503b", kill_on_drop: false }`
[INFO] [stdout] 15d2467827c69f45933f141036d49a595835599f3b209a5ff46d54873fbb503b