[INFO] cloning repository https://github.com/cassaundra/lang-char-freq
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cassaundra/lang-char-freq" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcassaundra%2Flang-char-freq", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcassaundra%2Flang-char-freq'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e55f803615c4665e2d95e6b06e986931c7499ac
[INFO] documenting cassaundra/lang-char-freq against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcassaundra%2Flang-char-freq" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cassaundra/lang-char-freq on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cassaundra/lang-char-freq
[INFO] finished tweaking git repo https://github.com/cassaundra/lang-char-freq
[INFO] tweaked toml for git repo https://github.com/cassaundra/lang-char-freq written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/cassaundra/lang-char-freq already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
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[INFO] [stderr]   Downloaded core-text v13.3.2
[INFO] [stderr]   Downloaded bzip2-sys v0.1.8+1.0.8
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5888a6a0756f5fc979343f6fae2751f8ff1db281c2cd41d1f870477c24e39d1b
[INFO] running `Command { std: "docker" "start" "-a" "5888a6a0756f5fc979343f6fae2751f8ff1db281c2cd41d1f870477c24e39d1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5888a6a0756f5fc979343f6fae2751f8ff1db281c2cd41d1f870477c24e39d1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5888a6a0756f5fc979343f6fae2751f8ff1db281c2cd41d1f870477c24e39d1b", kill_on_drop: false }`
[INFO] [stdout] 5888a6a0756f5fc979343f6fae2751f8ff1db281c2cd41d1f870477c24e39d1b
[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" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 71d025ff656f2482b0cd3dabeaf8b73ba3c56efa95935c08b31768936f5ffb0c
[INFO] running `Command { std: "docker" "start" "-a" "71d025ff656f2482b0cd3dabeaf8b73ba3c56efa95935c08b31768936f5ffb0c", kill_on_drop: false }`
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[INFO] [stderr]    Compiling futures-macro v0.3.4
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[INFO] [stderr]     Checking plotters v0.2.12
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[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking tokio-util v0.3.1
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[INFO] [stderr]     Checking toml v0.5.6
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[INFO] [stderr]     Checking hyper-tls v0.4.1
[INFO] [stderr]     Checking reqwest v0.10.4
[INFO] [stderr]  Documenting lang-char-freq v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: 1 positional argument in format string, but no arguments were given
[INFO] [stdout]  --> src/error.rs:7:35
[INFO] [stdout]   |
[INFO] [stdout] 7 |     #[error(display = "I/O error: {}")]
[INFO] [stdout]   |                                   ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: 1 positional argument in format string, but no arguments were given
[INFO] [stdout]  --> src/error.rs:9:43
[INFO] [stdout]   |
[INFO] [stdout] 9 |     #[error(display = "HTTP client error: {}")]
[INFO] [stdout]   |                                           ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: 1 positional argument in format string, but no arguments were given
[INFO] [stdout]   --> src/error.rs:11:52
[INFO] [stdout]    |
[INFO] [stdout] 11 |     #[error(display = "TOML deserialization error: {}")]
[INFO] [stdout]    |                                                    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `lang-char-freq`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name lang_char_freq src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bytes=/opt/rustwide/target/debug/deps/libbytes-be6cb9a7be86933c.rmeta --extern err_derive=/opt/rustwide/target/debug/deps/liberr_derive-2e33fffd3d722f09.so --extern flate2=/opt/rustwide/target/debug/deps/libflate2-a106c7541808ad0f.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-524b2ae3971229d1.rmeta --extern plotters=/opt/rustwide/target/debug/deps/libplotters-f43ebc9f20c67f17.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-8bb6b9ad8b307d5c.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-9ac88af066c43285.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-9e0783ebf3017558.rmeta --extern tar=/opt/rustwide/target/debug/deps/libtar-d65aef347d4e1708.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-51f33319dcc59a25.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-693b1ce2c35de585.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-4f7359035bd68b0b.rmeta --extern tracing_subscriber=/opt/rustwide/target/debug/deps/libtracing_subscriber-d809bee736cf5b6c.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-13b8c5703ff5c619.rmeta --extern zip=/opt/rustwide/target/debug/deps/libzip-507590a0e7919326.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "71d025ff656f2482b0cd3dabeaf8b73ba3c56efa95935c08b31768936f5ffb0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71d025ff656f2482b0cd3dabeaf8b73ba3c56efa95935c08b31768936f5ffb0c", kill_on_drop: false }`
[INFO] [stdout] 71d025ff656f2482b0cd3dabeaf8b73ba3c56efa95935c08b31768936f5ffb0c
