[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#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvroland%2Fmfnf-export" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vroland/mfnf-export on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "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-2/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b2c52643fd20233e75f83dcca2cf90c4bcfcbf6cd6780a2dab604690810f50cf
[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" "b2c52643fd20233e75f83dcca2cf90c4bcfcbf6cd6780a2dab604690810f50cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2c52643fd20233e75f83dcca2cf90c4bcfcbf6cd6780a2dab604690810f50cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2c52643fd20233e75f83dcca2cf90c4bcfcbf6cd6780a2dab604690810f50cf", kill_on_drop: false }`
[INFO] [stdout] b2c52643fd20233e75f83dcca2cf90c4bcfcbf6cd6780a2dab604690810f50cf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 035996f84ff93554e59750b997a75e698a134bc720d6b033934a4e4eddc28431
[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" "035996f84ff93554e59750b997a75e698a134bc720d6b033934a4e4eddc28431", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.26
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling linked-hash-map v0.5.1
[INFO] [stderr]    Compiling dtoa v0.4.3
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking bitflags v1.0.4
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking itoa v0.4.3
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]    Compiling serde v1.0.85
[INFO] [stderr]     Checking colored v1.7.0
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking serde_json v1.0.37
[INFO] [stderr]     Checking serde_yaml v0.8.8
[INFO] [stderr]    Compiling yaml-rust v0.4.2
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]    Compiling peg v0.5.7
[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]    Compiling serde_yaml v0.7.5
[INFO] [stderr]    Compiling serde_derive v1.0.85
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[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-5745d4ed96126936/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', /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/core/src/mem/mod.rs:660:9
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55f06033ea10 - std::backtrace_rs::backtrace::libunwind::trace::h706b838f5bbd876b
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stderr]      1:     0x55f06033ea10 - std::backtrace_rs::backtrace::trace_unsynchronized::hc15f29ae7822b7b8
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x55f06033ea10 - std::sys_common::backtrace::_print_fmt::h7c580c971f91926c
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]      3:     0x55f06033ea10 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2a772198c4032452
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stderr]      4:     0x55f06035ebec - core::fmt::write::h9a6d9c74526a6c1b
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/core/src/fmt/mod.rs:1115:17
[INFO] [stderr]      5:     0x55f06033c665 - std::io::Write::write_fmt::h00f38d9eb2c32e02
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/io/mod.rs:1663:15
[INFO] [stderr]      6:     0x55f06034068b - std::sys_common::backtrace::_print::h5b3c171e6f864ae4
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stderr]      7:     0x55f06034068b - std::sys_common::backtrace::print::h93b9e9ed2a98e611
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stderr]      8:     0x55f06034068b - std::panicking::default_hook::{{closure}}::hd8da92bb68d520c5
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:208:50
[INFO] [stderr]      9:     0x55f060340161 - std::panicking::default_hook::hdbc8b2951c5afbab
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:225:9
[INFO] [stderr]     10:     0x55f060340d54 - std::panicking::rust_panic_with_hook::h8a4c841655926f4e
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:622:17
[INFO] [stderr]     11:     0x55f060340807 - std::panicking::begin_panic_handler::{{closure}}::h471b6bc74904b7b0
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:517:13
[INFO] [stderr]     12:     0x55f06033ef0c - std::sys_common::backtrace::__rust_end_short_backtrace::h309f5c707f29932f
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stderr]     13:     0x55f060340799 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:515:5
[INFO] [stderr]     14:     0x55f0601cf0d1 - core::panicking::panic_fmt::hcf5f6d96e1dd7099
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/core/src/panicking.rs:92:14
[INFO] [stderr]     15:     0x55f0601cf01d - core::panicking::panic::hd695e3b1d0dd4ef4
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/core/src/panicking.rs:50:5
[INFO] [stderr]     16:     0x55f0602a059a - core::mem::uninitialized::h7b5e1ff96573927d
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/core/src/mem/mod.rs:660:9
[INFO] [stderr]     17:     0x55f0602a059a - linked_hash_map::LinkedHashMap<K,V,S>::ensure_guard_node::h75f58bb44d4362d1
[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:     0x55f0602a07bc - linked_hash_map::LinkedHashMap<K,V,S>::insert::h6d98e19c5d5c9f0d
[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:     0x55f060271b36 - <serde_yaml::ser::SerializeStruct as serde::ser::SerializeStruct>::serialize_field::hd02bf6ab3516ce5f
[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:     0x55f06026c95a - <serde::private::ser::TaggedSerializer<S> as serde::ser::Serializer>::serialize_struct::h2ed7874a60d0e401
[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:     0x55f0601f5791 - build_script_build::ast::_IMPL_SERIALIZE_FOR_Document::<impl serde::ser::Serialize for build_script_build::ast::Document>::serialize::hb87e149a1bb14177
[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:     0x55f06026c238 - serde::private::ser::serialize_tagged_newtype::he52b72fc848bf8ad
[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:     0x55f0601f6a07 - build_script_build::ast::_IMPL_SERIALIZE_FOR_Element::<impl serde::ser::Serialize for build_script_build::ast::Element>::serialize::h6932a46f046bdd85
[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:     0x55f0601d3ce8 - serde::ser::impls::<impl serde::ser::Serialize for &T>::serialize::h57e87d4796854967
[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:     0x55f06026ce6b - serde_yaml::ser::to_yaml::h89ca50a8fe7f302c
[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:     0x55f06026d269 - serde_yaml::ser::to_writer::hde4248070adbeebd
[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:     0x55f06026cb19 - serde_yaml::ser::to_vec::h0855ac2a46b7219e
[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:     0x55f06026d0a5 - serde_yaml::ser::to_string::h4d3fa99d7e5c98a5
[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:     0x55f060265a9a - build_script_build::Test::write_code::h08ae6a0a88379ad1
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:68:13
[INFO] [stderr]     30:     0x55f0602664ad - build_script_build::generate_tests::h23e7c767b8269c14
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:102:9
[INFO] [stderr]     31:     0x55f060266597 - build_script_build::main::h5ed8a06af3688d25
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mediawiki_parser-0.4.2/build.rs:108:5
[INFO] [stderr]     32:     0x55f06021d16b - core::ops::function::FnOnce::call_once::h6dd494a656515e69
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/core/src/ops/function.rs:227:5
[INFO] [stderr]     33:     0x55f06022d47e - std::sys_common::backtrace::__rust_begin_short_backtrace::hc21ac296e40430de
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stderr]     34:     0x55f060227271 - std::rt::lang_start::{{closure}}::hd239a2683f63cb0f
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/rt.rs:63:18
[INFO] [stderr]     35:     0x55f06034125a - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hcbe5785d54a49ce2
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/core/src/ops/function.rs:259:13
[INFO] [stderr]     36:     0x55f06034125a - std::panicking::try::do_call::h1c15e7ee8563c29d
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:401:40
[INFO] [stderr]     37:     0x55f06034125a - std::panicking::try::hb8b07cef009cb4fc
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:365:19
[INFO] [stderr]     38:     0x55f06034125a - std::panic::catch_unwind::h65a8efbe596bcbb1
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panic.rs:434:14
[INFO] [stderr]     39:     0x55f06034125a - std::rt::lang_start_internal::{{closure}}::h66ded7ab0f18e9fb
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/rt.rs:45:48
[INFO] [stderr]     40:     0x55f06034125a - std::panicking::try::do_call::h29cafa65efb3f3f3
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:401:40
[INFO] [stderr]     41:     0x55f06034125a - std::panicking::try::h412fc5378b4dbfc4
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panicking.rs:365:19
[INFO] [stderr]     42:     0x55f06034125a - std::panic::catch_unwind::h555def6aac5bf192
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/panic.rs:434:14
[INFO] [stderr]     43:     0x55f06034125a - std::rt::lang_start_internal::hfff48202d7fee6e3
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/rt.rs:45:20
[INFO] [stderr]     44:     0x55f060227240 - std::rt::lang_start::h73c462d12f4d4457
[INFO] [stderr]                                  at /rustc/ddfd70ee3c3748e597b32f416b0d15a4f6e37685/library/std/src/rt.rs:62:5
[INFO] [stderr]     45:     0x55f060267b2c - main
[INFO] [stderr]     46:     0x7ffa6ef420b3 - __libc_start_main
[INFO] [stderr]     47:     0x55f0601cf88e - _start
[INFO] [stderr]     48:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "035996f84ff93554e59750b997a75e698a134bc720d6b033934a4e4eddc28431", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "035996f84ff93554e59750b997a75e698a134bc720d6b033934a4e4eddc28431", kill_on_drop: false }`
[INFO] [stdout] 035996f84ff93554e59750b997a75e698a134bc720d6b033934a4e4eddc28431