[INFO] fetching crate mdbook-skill-tree 3.0.0...
[INFO] checking mdbook-skill-tree-3.0.0 against try#506dff8de9f54f528028a7e4497ea925a4f3e19e for pr-94295
[INFO] extracting crate mdbook-skill-tree 3.0.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate mdbook-skill-tree 3.0.0 on toolchain 506dff8de9f54f528028a7e4497ea925a4f3e19e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+506dff8de9f54f528028a7e4497ea925a4f3e19e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mdbook-skill-tree 3.0.0
[INFO] finished tweaking crates.io crate mdbook-skill-tree 3.0.0
[INFO] tweaked toml for crates.io crate mdbook-skill-tree 3.0.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate mdbook-skill-tree 3.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+506dff8de9f54f528028a7e4497ea925a4f3e19e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.8
[INFO] [stderr]   Downloaded pulldown-cmark-to-cmark v4.0.2
[INFO] [stderr]   Downloaded toml_edit v0.1.5
[INFO] [stderr]   Downloaded unreachable v1.0.0
[INFO] [stderr]   Downloaded combine v3.8.1
[INFO] [stderr]   Downloaded proc-macro-error v1.0.2
[INFO] [stderr]   Downloaded proc-macro-error-attr v1.0.2
[INFO] [stderr]   Downloaded serde_json v1.0.55
[INFO] [stderr]   Downloaded serde_derive v1.0.111
[INFO] [stderr]   Downloaded filetime v0.2.10
[INFO] [stderr]   Downloaded structopt v0.3.14
[INFO] [stderr]   Downloaded hermit-abi v0.1.13
[INFO] [stderr]   Downloaded ascii v0.9.3
[INFO] [stderr]   Downloaded anyhow v1.0.31
[INFO] [stderr]   Downloaded htmlescape v0.3.1
[INFO] [stderr]   Downloaded serde v1.0.111
[INFO] [stderr]   Downloaded structopt-derive v0.4.7
[INFO] [stderr]   Downloaded handlebars v3.1.0
[INFO] [stderr]   Downloaded skill-tree v3.0.0
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+506dff8de9f54f528028a7e4497ea925a4f3e19e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6c2a5dcef3c9f357a480e28cfc9052d65530f151ecf98e0ab3d93230003a3d09
[INFO] running `Command { std: "docker" "start" "-a" "6c2a5dcef3c9f357a480e28cfc9052d65530f151ecf98e0ab3d93230003a3d09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6c2a5dcef3c9f357a480e28cfc9052d65530f151ecf98e0ab3d93230003a3d09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c2a5dcef3c9f357a480e28cfc9052d65530f151ecf98e0ab3d93230003a3d09", kill_on_drop: false }`
[INFO] [stdout] 6c2a5dcef3c9f357a480e28cfc9052d65530f151ecf98e0ab3d93230003a3d09
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+506dff8de9f54f528028a7e4497ea925a4f3e19e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ed385794c0ad23452b5cc59b050048737dbe1245be1b86c20e77e7eb06fe87ca
[INFO] running `Command { std: "docker" "start" "-a" "ed385794c0ad23452b5cc59b050048737dbe1245be1b86c20e77e7eb06fe87ca", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling serde_json v1.0.55
[INFO] [stderr]    Compiling ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling siphasher v0.3.3
[INFO] [stderr]    Compiling futures-core v0.3.15
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking utf-8 v0.7.5
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking smallvec v1.4.0
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]    Compiling futures-task v0.3.15
[INFO] [stderr]     Checking futures-sink v0.3.15
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]     Checking pin-project-lite v0.1.12
[INFO] [stderr]    Compiling pin-project-internal v0.4.28
[INFO] [stderr]    Compiling futures-channel v0.3.15
[INFO] [stderr]     Checking cpufeatures v0.1.4
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling anyhow v1.0.31
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]    Compiling pulldown-cmark v0.7.1
[INFO] [stderr]     Checking futures-io v0.3.15
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking lazycell v1.2.1
[INFO] [stderr]     Checking dtoa v0.4.8
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]     Checking scoped-tls v1.0.0
[INFO] [stderr]     Checking urlencoding v1.3.3
[INFO] [stderr]     Checking ascii v0.9.3
[INFO] [stderr]     Checking maplit v1.0.2
[INFO] [stderr]     Checking strum v0.18.0
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking svg v0.5.12
[INFO] [stderr]     Checking htmlescape v0.3.1
[INFO] [stderr]     Checking open v1.4.0
[INFO] [stderr]     Checking shlex v1.0.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]     Checking futf v0.1.4
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]     Checking tracing-core v0.1.18
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]     Checking input_buffer v0.3.1
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking pest v2.1.3
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking gitignore v1.0.6
[INFO] [stderr]    Compiling serde v1.0.111
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]    Compiling futures-macro v0.3.15
[INFO] [stderr]    Compiling futures-util v0.3.15
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]    Compiling phf_shared v0.8.0
[INFO] [stderr]     Checking unicode-normalization v0.1.12
[INFO] [stderr]     Checking tendril v0.4.1
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking http v0.2.4
[INFO] [stderr]     Checking phf v0.8.0
[INFO] [stderr]     Checking string_cache v0.8.0
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking headers-core v0.2.0
[INFO] [stderr]     Checking tracing v0.1.26
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking net2 v0.2.37
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking inotify-sys v0.1.3
[INFO] [stderr]     Checking socket2 v0.3.19
[INFO] [stderr]     Checking filetime v0.2.10
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking pulldown-cmark-to-cmark v4.0.2
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]     Checking inotify v0.7.1
[INFO] [stderr]     Checking sha-1 v0.9.6
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking headers v0.3.4
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking notify v4.0.15
[INFO] [stderr]    Compiling phf_generator v0.8.0
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling phf_codegen v0.8.0
[INFO] [stderr]    Compiling string_cache_codegen v0.5.1
[INFO] [stderr]     Checking tungstenite v0.11.1
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling pin-project-internal v1.0.7
[INFO] [stderr]    Compiling html5ever v0.25.1
[INFO] [stderr]    Compiling fehler-macros v1.0.0
[INFO] [stderr]    Compiling strum_macros v0.18.0
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking toml_edit v0.1.5
[INFO] [stderr]     Checking handlebars v3.1.0
[INFO] [stderr]     Checking tokio v0.2.25
[INFO] [stderr]    Compiling structopt-derive v0.4.7
[INFO] [stderr]     Checking pin-project v1.0.7
[INFO] [stderr] error: could not compile `tokio`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name tokio --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.25/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="blocking"' --cfg 'feature="default"' --cfg 'feature="fnv"' --cfg 'feature="fs"' --cfg 'feature="futures-core"' --cfg 'feature="io-driver"' --cfg 'feature="io-util"' --cfg 'feature="iovec"' --cfg 'feature="lazy_static"' --cfg 'feature="macros"' --cfg 'feature="memchr"' --cfg 'feature="mio"' --cfg 'feature="rt-core"' --cfg 'feature="slab"' --cfg 'feature="stream"' --cfg 'feature="sync"' --cfg 'feature="tcp"' --cfg 'feature="time"' --cfg 'feature="tokio-macros"' -C metadata=304f104881e63470 -C extra-filename=-304f104881e63470 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern bytes=/opt/rustwide/target/debug/deps/libbytes-1351b578c83586bb.rmeta --extern fnv=/opt/rustwide/target/debug/deps/libfnv-05b588ffc45292c6.rmeta --extern futures_core=/opt/rustwide/target/debug/deps/libfutures_core-57e0c705585be06f.rmeta --extern iovec=/opt/rustwide/target/debug/deps/libiovec-5106050796e5d694.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-3ab14ef94a1f89cf.rmeta --extern memchr=/opt/rustwide/target/debug/deps/libmemchr-eb1f78cbbfbec8a9.rmeta --extern mio=/opt/rustwide/target/debug/deps/libmio-8931f91ac031be31.rmeta --extern pin_project_lite=/opt/rustwide/target/debug/deps/libpin_project_lite-fbff80c024aea495.rmeta --extern slab=/opt/rustwide/target/debug/deps/libslab-4b997cf9064f0eb5.rmeta --extern tokio_macros=/opt/rustwide/target/debug/deps/libtokio_macros-2227e2f4f1566d75.so --cap-lints allow --cap-lints=forbid` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ed385794c0ad23452b5cc59b050048737dbe1245be1b86c20e77e7eb06fe87ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed385794c0ad23452b5cc59b050048737dbe1245be1b86c20e77e7eb06fe87ca", kill_on_drop: false }`
[INFO] [stdout] ed385794c0ad23452b5cc59b050048737dbe1245be1b86c20e77e7eb06fe87ca