[INFO] cloning repository https://github.com/jkcclemens/mod_mail
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jkcclemens/mod_mail" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjkcclemens%2Fmod_mail", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjkcclemens%2Fmod_mail'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9c6937f775b652505d4f7ce816261a11e0036d14
[INFO] documenting jkcclemens/mod_mail against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjkcclemens%2Fmod_mail" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jkcclemens/mod_mail on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jkcclemens/mod_mail
[INFO] finished tweaking git repo https://github.com/jkcclemens/mod_mail
[INFO] tweaked toml for git repo https://github.com/jkcclemens/mod_mail written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/jkcclemens/mod_mail already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f06429c0cf56f22738fdf94f34bc6b8d93a231b3ec2acfc6fe69f0c76b2cc3d3
[INFO] running `Command { std: "docker" "start" "-a" "f06429c0cf56f22738fdf94f34bc6b8d93a231b3ec2acfc6fe69f0c76b2cc3d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f06429c0cf56f22738fdf94f34bc6b8d93a231b3ec2acfc6fe69f0c76b2cc3d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f06429c0cf56f22738fdf94f34bc6b8d93a231b3ec2acfc6fe69f0c76b2cc3d3", kill_on_drop: false }`
[INFO] [stdout] f06429c0cf56f22738fdf94f34bc6b8d93a231b3ec2acfc6fe69f0c76b2cc3d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f3fdfe9aae5140efc4aad5ea885e5c32a87bbe1d4063d6c0f5c70678ba1aed68
[INFO] running `Command { std: "docker" "start" "-a" "f3fdfe9aae5140efc4aad5ea885e5c32a87bbe1d4063d6c0f5c70678ba1aed68", kill_on_drop: false }`
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[INFO] [stderr]    Compiling libc v0.2.60
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[INFO] [stderr]    Compiling synstructure v0.10.2
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[INFO] [stderr]    Compiling serde_derive v1.0.98
[INFO] [stderr]    Compiling diesel_derives v1.4.0
[INFO] [stderr]    Compiling command_attr v0.1.4
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[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking serde_urlencoded v0.5.5
[INFO] [stderr]     Checking chrono v0.4.7
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[INFO] [stderr]     Checking reqwest v0.9.19
[INFO] [stderr]     Checking r2d2-diesel v1.0.0
[INFO] [stderr]  Documenting mod_mail v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `mod_mail`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name mod_mail 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 chrono=/opt/rustwide/target/debug/deps/libchrono-93e7a9ba13a76c85.rmeta --extern diesel=/opt/rustwide/target/debug/deps/libdiesel-44d89128856771df.rmeta --extern dotenv=/opt/rustwide/target/debug/deps/libdotenv-4e3d97c889c5a8ea.rmeta --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-eb2beda27f591511.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-607d7aa781c98244.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-081eb5e631e35c3b.rmeta --extern postgres=/opt/rustwide/target/debug/deps/libpostgres-57f9cfece29f315f.rmeta --extern r2d2=/opt/rustwide/target/debug/deps/libr2d2-c67cc1a84443d7ef.rmeta --extern r2d2_diesel=/opt/rustwide/target/debug/deps/libr2d2_diesel-5324ba5f2c98cf9f.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-17865fa00bfe6352.rmeta --extern serenity=/opt/rustwide/target/debug/deps/libserenity-1d81de727c2f4a3a.rmeta --extern strsim=/opt/rustwide/target/debug/deps/libstrsim-adf7026207ecec23.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "f3fdfe9aae5140efc4aad5ea885e5c32a87bbe1d4063d6c0f5c70678ba1aed68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3fdfe9aae5140efc4aad5ea885e5c32a87bbe1d4063d6c0f5c70678ba1aed68", kill_on_drop: false }`
[INFO] [stdout] f3fdfe9aae5140efc4aad5ea885e5c32a87bbe1d4063d6c0f5c70678ba1aed68
