[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 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcassaundra%2Flang-char-freq" "/workspace/builds/worker-36/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-36/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cassaundra/lang-char-freq on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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-36/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" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
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[INFO] [stderr]   Downloaded bzip2 v0.3.3
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[INFO] [stderr]   Downloaded zip v0.5.5
[INFO] [stderr]   Downloaded xattr v0.2.2
[INFO] [stderr]   Downloaded plotters v0.2.12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fea65c9cb34494df85209982f4369def688265180699200a8246cb54c10114c2
[INFO] running `Command { std: "docker" "start" "-a" "fea65c9cb34494df85209982f4369def688265180699200a8246cb54c10114c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fea65c9cb34494df85209982f4369def688265180699200a8246cb54c10114c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fea65c9cb34494df85209982f4369def688265180699200a8246cb54c10114c2", kill_on_drop: false }`
[INFO] [stdout] fea65c9cb34494df85209982f4369def688265180699200a8246cb54c10114c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4aa831375ff47579c9996ebb6a7d4bd94671b9a5c1b4eac47e3ae751ef72894c
[INFO] running `Command { std: "docker" "start" "-a" "4aa831375ff47579c9996ebb6a7d4bd94671b9a5c1b4eac47e3ae751ef72894c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
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[INFO] [stderr]    Compiling futures-macro v0.3.4
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[INFO] [stderr]    Compiling palette_derive v0.5.0
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[INFO] [stderr]     Checking hyper v0.13.4
[INFO] [stderr]     Checking serde_json v1.0.50
[INFO] [stderr]     Checking tracing-serde v0.1.1
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[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,artifacts,future-incompat --document-private-items -C metadata=a7e7c586c939af2e -L dependency=/opt/rustwide/target/debug/deps --extern bytes=/opt/rustwide/target/debug/deps/libbytes-d2f9b88178ca7b9a.rmeta --extern err_derive=/opt/rustwide/target/debug/deps/liberr_derive-ad4d92d7737d36da.so --extern flate2=/opt/rustwide/target/debug/deps/libflate2-e52f9a725aa0d813.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-8c0b8b62b5c70d3a.rmeta --extern plotters=/opt/rustwide/target/debug/deps/libplotters-fcc209fdf919c346.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-45e123576aae843d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-08552e528e50578c.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-a3edeb61e91d36bf.rmeta --extern tar=/opt/rustwide/target/debug/deps/libtar-e459bee6dd6805d0.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-2d2cf32f3573e39b.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-0fad446d43d324b9.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-4af5f9f9e2a9cdc9.rmeta --extern tracing_subscriber=/opt/rustwide/target/debug/deps/libtracing_subscriber-5788865305d7cd1c.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-61e7bbb96e22c0fa.rmeta --extern zip=/opt/rustwide/target/debug/deps/libzip-dd857f5019e5ba84.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "4aa831375ff47579c9996ebb6a7d4bd94671b9a5c1b4eac47e3ae751ef72894c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4aa831375ff47579c9996ebb6a7d4bd94671b9a5c1b4eac47e3ae751ef72894c", kill_on_drop: false }`
[INFO] [stdout] 4aa831375ff47579c9996ebb6a7d4bd94671b9a5c1b4eac47e3ae751ef72894c