[INFO] fetching crate mdbook-epub 0.4.51...
[INFO] building mdbook-epub-0.4.51 against try#58b1b3c5342a414c161338871f8004258ccef2a7 for pr-149937
[INFO] extracting crate mdbook-epub 0.4.51 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate mdbook-epub 0.4.51
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate mdbook-epub 0.4.51
[INFO] tweaked toml for crates.io crate mdbook-epub 0.4.51 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mdbook-epub 0.4.51 on toolchain 58b1b3c5342a414c161338871f8004258ccef2a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+58b1b3c5342a414c161338871f8004258ccef2a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mdbook-epub 0.4.51 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+58b1b3c5342a414c161338871f8004258ccef2a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+58b1b3c5342a414c161338871f8004258ccef2a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] df39c1c44e5799a508321c439135ab2e255625adec86cd5c708e476b11b33b2a
[INFO] running `Command { std: "docker" "start" "-a" "df39c1c44e5799a508321c439135ab2e255625adec86cd5c708e476b11b33b2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "df39c1c44e5799a508321c439135ab2e255625adec86cd5c708e476b11b33b2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df39c1c44e5799a508321c439135ab2e255625adec86cd5c708e476b11b33b2a", kill_on_drop: false }`
[INFO] [stdout] df39c1c44e5799a508321c439135ab2e255625adec86cd5c708e476b11b33b2a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+58b1b3c5342a414c161338871f8004258ccef2a7" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 46595f53ee4595db190596fcdbab01708312e7aa16f8bbd43fdd01fc8dd5a2b2
[INFO] running `Command { std: "docker" "start" "-a" "46595f53ee4595db190596fcdbab01708312e7aa16f8bbd43fdd01fc8dd5a2b2", kill_on_drop: false }`
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[INFO] [stderr]    Compiling mdbook v0.4.52
[INFO] [stderr]    Compiling mdbook-epub v0.4.51 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 42s
[INFO] running `Command { std: "docker" "inspect" "46595f53ee4595db190596fcdbab01708312e7aa16f8bbd43fdd01fc8dd5a2b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46595f53ee4595db190596fcdbab01708312e7aa16f8bbd43fdd01fc8dd5a2b2", kill_on_drop: false }`
[INFO] [stdout] 46595f53ee4595db190596fcdbab01708312e7aa16f8bbd43fdd01fc8dd5a2b2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+58b1b3c5342a414c161338871f8004258ccef2a7" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b734bf847a9221999e9f4fb7e8e22a2b631c4bf1d7b8c547ef4b257b3a0f3cc0
[INFO] running `Command { std: "docker" "start" "-a" "b734bf847a9221999e9f4fb7e8e22a2b631c4bf1d7b8c547ef4b257b3a0f3cc0", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-channel v0.3.31
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[INFO] [stderr]    Compiling mdbook v0.4.52
[INFO] [stderr]    Compiling mdbook-epub v0.4.51 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 31.60s
[INFO] running `Command { std: "docker" "inspect" "b734bf847a9221999e9f4fb7e8e22a2b631c4bf1d7b8c547ef4b257b3a0f3cc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b734bf847a9221999e9f4fb7e8e22a2b631c4bf1d7b8c547ef4b257b3a0f3cc0", kill_on_drop: false }`
[INFO] [stdout] b734bf847a9221999e9f4fb7e8e22a2b631c4bf1d7b8c547ef4b257b3a0f3cc0