[INFO] fetching crate mdbook-epub 0.4.15-beta...
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] crate mdbook-epub 0.4.15-beta is already in cache
[INFO] checking mdbook-epub-0.4.15-beta against master#1673f1450eeaf4a5452e086db0fe2ae274a0144f for pr-99413
[INFO] extracting crate mdbook-epub 0.4.15-beta into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate mdbook-epub 0.4.15-beta on toolchain 1673f1450eeaf4a5452e086db0fe2ae274a0144f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1673f1450eeaf4a5452e086db0fe2ae274a0144f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mdbook-epub 0.4.15-beta
[INFO] finished tweaking crates.io crate mdbook-epub 0.4.15-beta
[INFO] tweaked toml for crates.io crate mdbook-epub 0.4.15-beta written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate mdbook-epub 0.4.15-beta already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1673f1450eeaf4a5452e086db0fe2ae274a0144f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustc-demangle v0.1.17
[INFO] [stderr]   Downloaded backtrace v0.3.53
[INFO] [stderr]   Downloaded structopt v0.3.20
[INFO] [stderr]   Downloaded object v0.21.1
[INFO] [stderr]   Downloaded syn v1.0.45
[INFO] [stderr]   Downloaded smallvec v1.5.0
[INFO] [stderr]   Downloaded open v1.4.0
[INFO] [stderr]   Downloaded mustache v0.9.0
[INFO] [stderr]   Downloaded zip v0.5.8
[INFO] [stderr]   Downloaded quick-error v2.0.0
[INFO] [stderr]   Downloaded html-escape v0.2.6
[INFO] [stderr]   Downloaded handlebars v3.5.0
[INFO] [stderr]   Downloaded bzip2 v0.3.3
[INFO] [stderr]   Downloaded aho-corasick v0.7.14
[INFO] [stderr]   Downloaded pulldown-cmark v0.7.2
[INFO] [stderr]   Downloaded structopt-derive v0.4.13
[INFO] [stderr]   Downloaded pulldown-cmark v0.9.0
[INFO] [stderr]   Downloaded serial_test_derive v0.5.0
[INFO] [stderr]   Downloaded serial_test v0.5.0
[INFO] [stderr]   Downloaded html_parser v0.6.2
[INFO] [stderr]   Downloaded epub-builder v0.5.0
[INFO] [stderr]   Downloaded bzip2-sys v0.1.9+1.0.8
[INFO] [stderr]   Downloaded mdbook v0.4.4
[INFO] [stderr]   Downloaded epub v1.2.2
[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:ecb52c4cf6672b83cc996368a05b4a059042425f2b6ba9cd23a06cdead5d8d70" "/opt/rustwide/cargo-home/bin/cargo" "+1673f1450eeaf4a5452e086db0fe2ae274a0144f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a860951bc7337bdfbc965d506e89085c2587fc7c7682c6d3ceec7e871328b56f
[INFO] running `Command { std: "docker" "start" "-a" "a860951bc7337bdfbc965d506e89085c2587fc7c7682c6d3ceec7e871328b56f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a860951bc7337bdfbc965d506e89085c2587fc7c7682c6d3ceec7e871328b56f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a860951bc7337bdfbc965d506e89085c2587fc7c7682c6d3ceec7e871328b56f", kill_on_drop: false }`
[INFO] [stdout] a860951bc7337bdfbc965d506e89085c2587fc7c7682c6d3ceec7e871328b56f
[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" "RUSTDOCFLAGS=--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:ecb52c4cf6672b83cc996368a05b4a059042425f2b6ba9cd23a06cdead5d8d70" "/opt/rustwide/cargo-home/bin/cargo" "+1673f1450eeaf4a5452e086db0fe2ae274a0144f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6f54d6389c121beebcbfa65f057a4f08409ad4ccc545816c7137942f8986c9c
[INFO] running `Command { std: "docker" "start" "-a" "c6f54d6389c121beebcbfa65f057a4f08409ad4ccc545816c7137942f8986c9c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.79
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[INFO] [stderr]    Compiling unicode-xid v0.2.1
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[INFO] [stderr]    Compiling version_check v0.9.2
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[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling bitflags v1.2.1
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[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking strsim v0.8.0
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[INFO] [stderr]    Compiling pulldown-cmark v0.7.2
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[INFO] [stderr]     Checking humantime v2.1.0
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[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking html-escape v0.2.6
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[INFO] [stderr]    Compiling bzip2-sys v0.1.9+1.0.8
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[INFO] [stderr]    Compiling pest_meta v2.1.3
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[INFO] [stderr]     Checking tempdir v0.3.7
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[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.21
[INFO] [stderr]    Compiling structopt-derive v0.4.13
[INFO] [stderr]    Compiling serial_test_derive v0.5.0
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking serial_test v0.5.0
[INFO] [stderr]     Checking failure v0.1.8
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[INFO] [stderr]     Checking zip v0.5.8
[INFO] [stderr]     Checking epub v1.2.2
[INFO] [stderr]     Checking structopt v0.3.20
[INFO] [stderr]     Checking toml v0.5.7
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[INFO] [stderr]     Checking epub-builder v0.5.0
[INFO] [stderr]     Checking handlebars v3.5.0
[INFO] [stderr]     Checking html_parser v0.6.2
[INFO] [stderr]     Checking handlebars v4.2.1
[INFO] [stderr]     Checking mdbook v0.4.4
[INFO] [stderr]     Checking mdbook-epub v0.4.15-beta (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.53s
[INFO] running `Command { std: "docker" "inspect" "c6f54d6389c121beebcbfa65f057a4f08409ad4ccc545816c7137942f8986c9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6f54d6389c121beebcbfa65f057a4f08409ad4ccc545816c7137942f8986c9c", kill_on_drop: false }`
[INFO] [stdout] c6f54d6389c121beebcbfa65f057a4f08409ad4ccc545816c7137942f8986c9c