[INFO] cloning repository rust-lang-nursery/mdBook
[INFO] running `"git" "clone" "--bare" "git://github.com/rust-lang-nursery/mdBook.git" "work/cache/sources/gh/rust-lang-nursery/mdBook"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/rust-lang-nursery/mdBook'...
[INFO] running `"git" "clone" "work/cache/sources/gh/rust-lang-nursery/mdBook" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/rust-lang-nursery/mdBook"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/rust-lang-nursery/mdBook'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rust-lang-nursery/mdBook" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/rust-lang-nursery/mdBook"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/rust-lang-nursery/mdBook'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a655d5d2419d314003c12047c41685f5de5d68ff
[INFO] sha for GitHub repo rust-lang-nursery/mdBook: a655d5d2419d314003c12047c41685f5de5d68ff
[INFO] validating manifest of rust-lang-nursery/mdBook on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rust-lang-nursery/mdBook on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rust-lang-nursery/mdBook
[INFO] finished frobbing rust-lang-nursery/mdBook
[INFO] frobbed toml for rust-lang-nursery/mdBook written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/rust-lang-nursery/mdBook/Cargo.toml
[INFO] started frobbing rust-lang-nursery/mdBook
[INFO] finished frobbing rust-lang-nursery/mdBook
[INFO] frobbed toml for rust-lang-nursery/mdBook written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/rust-lang-nursery/mdBook/Cargo.toml
[INFO] crate rust-lang-nursery/mdBook already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded toml-query v0.9.0
[INFO] [stderr]   Downloaded ws v0.8.1
[INFO] [stderr]   Downloaded ammonia v2.1.1
[INFO] [stderr]   Downloaded toml-query_derive v0.9.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rust-lang-nursery/mdBook against try#e212b7d492c96d3837691ba29d32d5f468933fb8 for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-2/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/rust-lang-nursery/mdBook:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "build" "--frozen"`
[INFO] [stdout] 93ed9111a398e5114b241ec1635cf20986aa60bc14744ec87f09d6abadffea02
[INFO] running `"docker" "start" "-a" "93ed9111a398e5114b241ec1635cf20986aa60bc14744ec87f09d6abadffea02"`
[INFO] [stderr]    Compiling pulldown-cmark v0.1.2
[INFO] [stderr]    Compiling strum v0.11.0
[INFO] [stderr]    Compiling is-match v0.1.0
[INFO] [stderr]    Compiling shlex v0.1.1
[INFO] [stderr]    Compiling open v1.2.2
[INFO] [stderr]    Compiling hyper v0.10.16
[INFO] [stderr]    Compiling mio-extras v2.0.5
[INFO] [stderr]    Compiling tempfile v3.0.8
[INFO] [stderr]    Compiling darling_core v0.8.6
[INFO] [stderr]    Compiling html5ever v0.23.0
[INFO] [stderr]    Compiling pest_generator v2.1.0
[INFO] [stderr]    Compiling strum_macros v0.11.0
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling sha-1 v0.8.1
[INFO] [stderr]    Compiling string_cache_codegen v0.4.2
[INFO] [stderr]    Compiling notify v4.0.12
[INFO] [stderr]    Compiling ws v0.8.1
[INFO] [stderr]    Compiling mime_guess v1.8.7
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]    Compiling markup5ever v0.8.1
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling elasticlunr-rs v2.3.4
[INFO] [stderr]    Compiling handlebars v1.1.0
[INFO] [stderr]    Compiling iron v0.6.0
[INFO] [stderr]    Compiling mount v0.4.0
[INFO] [stderr]    Compiling darling_macro v0.8.6
[INFO] [stderr]    Compiling staticfile v0.5.0
[INFO] [stderr]    Compiling darling v0.8.6
[INFO] [stderr]    Compiling toml-query_derive v0.9.0
[INFO] [stderr]    Compiling toml-query v0.9.0
[INFO] [stderr]    Compiling ammonia v2.1.1
[INFO] [stderr]    Compiling mdbook v0.2.4-alpha.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 26s
[INFO] running `"docker" "inspect" "93ed9111a398e5114b241ec1635cf20986aa60bc14744ec87f09d6abadffea02"`
[INFO] running `"docker" "rm" "-f" "93ed9111a398e5114b241ec1635cf20986aa60bc14744ec87f09d6abadffea02"`
[INFO] [stdout] 93ed9111a398e5114b241ec1635cf20986aa60bc14744ec87f09d6abadffea02
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-2/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/rust-lang-nursery/mdBook:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] c7a39931a98486d5255b8a462ef682a8912fb08f72ea5c1d690ec83075b9dc81
[INFO] running `"docker" "start" "-a" "c7a39931a98486d5255b8a462ef682a8912fb08f72ea5c1d690ec83075b9dc81"`
[INFO] [stderr]    Compiling pretty_assertions v0.6.1
[INFO] [stderr]    Compiling tendril v0.3.1
[INFO] [stderr]    Compiling html5ever v0.18.0
[INFO] [stderr]    Compiling pulldown-cmark-to-cmark v1.1.0
[INFO] [stderr]    Compiling string_cache v0.6.2
[INFO] [stderr]    Compiling markup5ever v0.3.2
[INFO] [stderr]    Compiling select v0.4.2
[INFO] [stderr]    Compiling mdbook v0.2.4-alpha.0 (/opt/crater/workdir)
[INFO] [stderr] error: linking with `cc` failed: exit code: 1
[INFO] [stderr]   |
[INFO] [stderr]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.0.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.1.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.10.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.11.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.12.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.13.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.14.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.15.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.2.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.3.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.4.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.5.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.6.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.7.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.8.rcgu.o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.init.ni5px3mn-cgu.9.rcgu.o" "-o" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5" "/opt/crater/target/debug/deps/init-c629b5433c76a6f5.4d872ycaqavn3l65.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/crater/target/debug/deps" "-L" "/opt/crater/target/debug/build/backtrace-sys-d638ae3455df95ba/out" "-L" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-663ecae12a465161.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libterm-acba595a0b25d09b.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-b618c2997fe9241e.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-4755c7b1004b2bec.rlib" "/opt/crater/target/debug/deps/libmdbook-0fe2ea939cb449e9.rlib" "/opt/crater/target/debug/deps/libammonia-b35461bb315982a4.rlib" "/opt/crater/target/debug/deps/liburl-18f39c3b1c2a1eae.rlib" "/opt/crater/target/debug/deps/libpercent_encoding-4058df92f77a8a44.rlib" "/opt/crater/target/debug/deps/libidna-3f1da9a8506cdfde.rlib" "/opt/crater/target/debug/deps/libunicode_normalization-646335b7da41506e.rlib" "/opt/crater/target/debug/deps/libsmallvec-49641c10b9b692fe.rlib" "/opt/crater/target/debug/deps/libunicode_bidi-1c3f7d9023c2eeee.rlib" "/opt/crater/target/debug/deps/libmatches-9fea24fa9cf53929.rlib" "/opt/crater/target/debug/deps/libmaplit-71cc3d8666405f78.rlib" "/opt/crater/target/debug/deps/libhtml5ever-1947942d0e15d795.rlib" "/opt/crater/target/debug/deps/libmarkup5ever-803e623404e8a206.rlib" "/opt/crater/target/debug/deps/libtendril-caeb8f4f9ce12573.rlib" "/opt/crater/target/debug/deps/libutf8-6662c566c793371a.rlib" "/opt/crater/target/debug/deps/libfutf-9ec390da10a54c60.rlib" "/opt/crater/target/debug/deps/libmac-986959b7cdb88cc2.rlib" "/opt/crater/target/debug/deps/libstring_cache-2f7413e50612bda8.rlib" "/opt/crater/target/debug/deps/libstring_cache_shared-41ed4c23d5aa81d8.rlib" "/opt/crater/target/debug/deps/libprecomputed_hash-6d25ce067e53d031.rlib" "/opt/crater/target/debug/deps/libdebug_unreachable-2ed62958189764b4.rlib" "/opt/crater/target/debug/deps/libphf-e156913d480c9fef.rlib" "/opt/crater/target/debug/deps/libphf_shared-3dbe4044b0deba5e.rlib" "/opt/crater/target/debug/deps/libunicase-a9b6b07a4a6d6be2.rlib" "/opt/crater/target/debug/deps/libsiphasher-56dfe666fdf22024.rlib" "/opt/crater/target/debug/deps/libitertools-0595d73188b5097e.rlib" "/opt/crater/target/debug/deps/libeither-861e652eef6ddf73.rlib" "/opt/crater/target/debug/deps/libelasticlunr-7660eed0b38b42b7.rlib" "/opt/crater/target/debug/deps/libstrum-dd26133a110d76a8.rlib" "/opt/crater/target/debug/deps/libhandlebars-c6311c989ca3aed7.rlib" "/opt/crater/target/debug/deps/libquick_error-d7ca1427a8163e25.rlib" "/opt/crater/target/debug/deps/libpest-43bdde5d79001e7f.rlib" "/opt/crater/target/debug/deps/libucd_trie-be4ddc44089f9e29.rlib" "/opt/crater/target/debug/deps/libshlex-5861068f4eb36fb2.rlib" "/opt/crater/target/debug/deps/libtoml_query-aa86752bf9ec2947.rlib" "/opt/crater/target/debug/deps/libregex-edd9ba6d8515b90f.rlib" "/opt/crater/target/debug/deps/libutf8_ranges-16f0d1a595ddf2bb.rlib" "/opt/crater/target/debug/deps/libregex_syntax-7909838c5595b284.rlib" "/opt/crater/target/debug/deps/libucd_util-dcd2d3cc31ba1999.rlib" "/opt/crater/target/debug/deps/libthread_local-2c757ab00e5f0fed.rlib" "/opt/crater/target/debug/deps/libaho_corasick-31154fcc224683ec.rlib" "/opt/crater/target/debug/deps/libfailure-d1500b2bb8a4e4cd.rlib" "/opt/crater/target/debug/deps/libis_match-310425fa62c1ea6d.rlib" "/opt/crater/target/debug/deps/libtoml-8d82f25d57e33a60.rlib" "/opt/crater/target/debug/deps/libtempfile-080ba85eba6e2991.rlib" "/opt/crater/target/debug/deps/libremove_dir_all-7762fc4290229646.rlib" "/opt/crater/target/debug/deps/librand-23d6b7752b83ba16.rlib" "/opt/crater/target/debug/deps/librand_xorshift-e3f911b54e25ff3b.rlib" "/opt/crater/target/debug/deps/librand_pcg-cebebf8d29fcd910.rlib" "/opt/crater/target/debug/deps/librand_hc-d24e8b637969bd0e.rlib" "/opt/crater/target/debug/deps/librand_chacha-bc2f20f84511d658.rlib" "/opt/crater/target/debug/deps/librand_isaac-d7bbe276c7b2d57a.rlib" "/opt/crater/target/debug/deps/librand_core-6fa9f5d43a50161b.rlib" "/opt/crater/target/debug/deps/librand_os-87d033d8ab2b0798.rlib" "/opt/crater/target/debug/deps/librand_jitter-9b6606ddf582036e.rlib" "/opt/crater/target/debug/deps/librand_core-2f3dd869820ff822.rlib" "/opt/crater/target/debug/deps/libpulldown_cmark-ea77e3669ee1939c.rlib" "/opt/crater/target/debug/deps/libbitflags-b2e1f3393de7b35b.rlib" "/opt/crater/target/debug/deps/libmemchr-461860405d325ee2.rlib" "/opt/crater/target/debug/deps/libserde_json-24b3e0fe74d35562.rlib" "/opt/crater/target/debug/deps/libryu-a0e568301c6b07fe.rlib" "/opt/crater/target/debug/deps/libitoa-fd3b91a6e39605ba.rlib" "/opt/crater/target/debug/deps/libserde-bc8ec1b7bcb417b9.rlib" "/opt/crater/target/debug/deps/liblog-2a4f7f7ec2655497.rlib" "/opt/crater/target/debug/deps/liblazy_static-e5ded5d8dfa94ec6.rlib" "/opt/crater/target/debug/deps/liberror_chain-c740d8af18695ad2.rlib" "/opt/crater/target/debug/deps/libbacktrace-b2a6363812cf2c97.rlib" "/opt/crater/target/debug/deps/libbacktrace_sys-1ea7831c1217af4d.rlib" "/opt/crater/target/debug/deps/librustc_demangle-2effa61dc0190dff.rlib" "/opt/crater/target/debug/deps/libcfg_if-dcbbde79dd2a51e5.rlib" "/opt/crater/target/debug/deps/liblibc-90f8cd9c1de733b2.rlib" "-Wl,--start-group" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-196d0eff8e603c0a.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-1c597f5941591e04.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-a20af2d3380aa511.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-f989f9e071798586.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-52fb60b932b5ef90.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-90a3fdc679697856.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-06d10270cfa51644.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-8abb913fca550f79.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-31fd2baab47b156c.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-0862cc65189bd4af.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-8010b8629f5aa3e5.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-2d032fe7d4e1e163.rlib" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-622fdce0dc084cba.rlib" "-Wl,--end-group" "/opt/crater/rustup-home/toolchains/e212b7d492c96d3837691ba29d32d5f468933fb8-alt/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-a17fdd0a687135a8.rlib" "-Wl,-Bdynamic" "-lutil" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil"
[INFO] [stderr]   = note: collect2: error: ld returned 1 exit status
[INFO] [stderr]           
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `mdbook`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: Could not compile `mdbook`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --edition=2018 --crate-name mdbook src/lib.rs --color never --emit=dep-info,metadata,link -C debuginfo=2 --test --cfg 'feature="ammonia"' --cfg 'feature="default"' --cfg 'feature="elasticlunr-rs"' --cfg 'feature="iron"' --cfg 'feature="notify"' --cfg 'feature="output"' --cfg 'feature="search"' --cfg 'feature="serve"' --cfg 'feature="staticfile"' --cfg 'feature="watch"' --cfg 'feature="ws"' -C metadata=39c55fcc6cfb651a -C extra-filename=-39c55fcc6cfb651a --out-dir /opt/crater/target/debug/deps -L dependency=/opt/crater/target/debug/deps --extern ammonia=/opt/crater/target/debug/deps/libammonia-b35461bb315982a4.rlib --extern chrono=/opt/crater/target/debug/deps/libchrono-f6e8aaaf2dcceac8.rlib --extern clap=/opt/crater/target/debug/deps/libclap-62b3c9dcd7e3a49f.rlib --extern elasticlunr=/opt/crater/target/debug/deps/libelasticlunr-7660eed0b38b42b7.rlib --extern env_logger=/opt/crater/target/debug/deps/libenv_logger-a7b904428ef604d0.rlib --extern error_chain=/opt/crater/target/debug/deps/liberror_chain-c740d8af18695ad2.rlib --extern handlebars=/opt/crater/target/debug/deps/libhandlebars-c6311c989ca3aed7.rlib --extern iron=/opt/crater/target/debug/deps/libiron-d49b744f26dad487.rlib --extern itertools=/opt/crater/target/debug/deps/libitertools-0595d73188b5097e.rlib --extern lazy_static=/opt/crater/target/debug/deps/liblazy_static-e5ded5d8dfa94ec6.rlib --extern log=/opt/crater/target/debug/deps/liblog-2a4f7f7ec2655497.rlib --extern memchr=/opt/crater/target/debug/deps/libmemchr-461860405d325ee2.rlib --extern notify=/opt/crater/target/debug/deps/libnotify-4139db56e48380a6.rlib --extern open=/opt/crater/target/debug/deps/libopen-a50d6e0f978c78a2.rlib --extern pretty_assertions=/opt/crater/target/debug/deps/libpretty_assertions-61c9358493bb4395.rlib --extern pulldown_cmark=/opt/crater/target/debug/deps/libpulldown_cmark-ea77e3669ee1939c.rlib --extern pulldown_cmark_to_cmark=/opt/crater/target/debug/deps/libpulldown_cmark_to_cmark-6d9fbb8c9104c2b7.rlib --extern regex=/opt/crater/target/debug/deps/libregex-edd9ba6d8515b90f.rlib --extern select=/opt/crater/target/debug/deps/libselect-3b0f42057a1adb56.rlib --extern serde=/opt/crater/target/debug/deps/libserde-bc8ec1b7bcb417b9.rlib --extern serde_derive=/opt/crater/target/debug/deps/libserde_derive-32afdf56e88d5872.so --extern serde_json=/opt/crater/target/debug/deps/libserde_json-24b3e0fe74d35562.rlib --extern shlex=/opt/crater/target/debug/deps/libshlex-5861068f4eb36fb2.rlib --extern staticfile=/opt/crater/target/debug/deps/libstaticfile-03c63e511bc1dcd1.rlib --extern tempfile=/opt/crater/target/debug/deps/libtempfile-080ba85eba6e2991.rlib --extern toml=/opt/crater/target/debug/deps/libtoml-8d82f25d57e33a60.rlib --extern toml_query=/opt/crater/target/debug/deps/libtoml_query-aa86752bf9ec2947.rlib --extern walkdir=/opt/crater/target/debug/deps/libwalkdir-c201473e3b7f8924.rlib --extern ws=/opt/crater/target/debug/deps/libws-9a2cd496001dbf64.rlib --cap-lints=forbid -L native=/opt/crater/target/debug/build/backtrace-sys-d638ae3455df95ba/out` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "c7a39931a98486d5255b8a462ef682a8912fb08f72ea5c1d690ec83075b9dc81"`
[INFO] running `"docker" "rm" "-f" "c7a39931a98486d5255b8a462ef682a8912fb08f72ea5c1d690ec83075b9dc81"`
[INFO] [stdout] c7a39931a98486d5255b8a462ef682a8912fb08f72ea5c1d690ec83075b9dc81