[INFO] cloning repository https://github.com/DevHeap/karma_slap
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DevHeap/karma_slap" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDevHeap%2Fkarma_slap", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDevHeap%2Fkarma_slap'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bd661618b3552ad059ba1007ab4d01b3fdc6f1f2
[INFO] documenting DevHeap/karma_slap against 1.76.0 for beta-1.77-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDevHeap%2Fkarma_slap" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DevHeap/karma_slap on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/DevHeap/karma_slap
[INFO] finished tweaking git repo https://github.com/DevHeap/karma_slap
[INFO] tweaked toml for git repo https://github.com/DevHeap/karma_slap written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/DevHeap/karma_slap 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" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded app_dirs v1.1.1
[INFO] [stderr]   Downloaded ole32-sys v0.2.0
[INFO] [stderr]   Downloaded clap v2.29.2
[INFO] [stderr]   Downloaded serde_derive_internals v0.19.0
[INFO] [stderr]   Downloaded cc v1.0.4
[INFO] [stderr]   Downloaded libc v0.2.36
[INFO] [stderr]   Downloaded serde v1.0.27
[INFO] [stderr]   Downloaded serde_json v1.0.9
[INFO] [stderr]   Downloaded serde_derive v1.0.27
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 282aeeadebb00f7ab243a5a2f6fe30e29a1c808fac2c62f2cde3f4c9f36371e1
[INFO] running `Command { std: "docker" "start" "-a" "282aeeadebb00f7ab243a5a2f6fe30e29a1c808fac2c62f2cde3f4c9f36371e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "282aeeadebb00f7ab243a5a2f6fe30e29a1c808fac2c62f2cde3f4c9f36371e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "282aeeadebb00f7ab243a5a2f6fe30e29a1c808fac2c62f2cde3f4c9f36371e1", kill_on_drop: false }`
[INFO] [stdout] 282aeeadebb00f7ab243a5a2f6fe30e29a1c808fac2c62f2cde3f4c9f36371e1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dabf40b4f17dab2c551a97a5747245f94ece5878eadb2c28ef9f921a131be2e6
[INFO] running `Command { std: "docker" "start" "-a" "dabf40b4f17dab2c551a97a5747245f94ece5878eadb2c28ef9f921a131be2e6", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.36
[INFO] [stderr]    Compiling cc v1.0.4
[INFO] [stderr]     Checking num-traits v0.1.41
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]     Checking cfg-if v0.1.2
[INFO] [stderr]     Checking rustc-demangle v0.1.5
[INFO] [stderr]     Checking unicode-width v0.1.4
[INFO] [stderr]     Checking serde v1.0.27
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking textwrap v0.9.0
[INFO] [stderr]     Checking vec_map v0.8.0
[INFO] [stderr]     Checking xdg v2.1.0
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking bitflags v1.0.1
[INFO] [stderr]     Checking ansi_term v0.10.2
[INFO] [stderr]     Checking dtoa v0.4.2
[INFO] [stderr]     Checking itoa v0.3.4
[INFO] [stderr]     Checking time v0.1.39
[INFO] [stderr]     Checking num-integer v0.1.35
[INFO] [stderr]     Checking atty v0.2.6
[INFO] [stderr]     Checking strsim v0.6.0
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking app_dirs v1.1.1
[INFO] [stderr]     Checking num-iter v0.1.34
[INFO] [stderr]     Checking clap v2.29.2
[INFO] [stderr]     Checking num v0.1.41
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]    Compiling serde_derive_internals v0.19.0
[INFO] [stderr]    Compiling serde_derive v1.0.27
[INFO] [stderr]     Checking chrono v0.4.0
[INFO] [stderr]     Checking serde_json v1.0.9
[INFO] [stderr]     Checking backtrace v0.3.5
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]  Documenting karma_slap 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(conservative_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `conservative_impl_trait` has been stable since `1.26.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `karma_slap`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.76.0-x86_64-unknown-linux-gnu/bin/rustdoc --crate-type bin --crate-name karma_slap src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=83a2e23196f415d3 -L dependency=/opt/rustwide/target/debug/deps --extern app_dirs=/opt/rustwide/target/debug/deps/libapp_dirs-3291f9f5b9b3a197.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-5328389e38a36ed0.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-60370339a53bd3cb.rmeta --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-b4746f081f5343b4.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-0479188ee970a210.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-2cfe74187118451f.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-67006cfe91b66e40.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-235f8d49cf841263.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "dabf40b4f17dab2c551a97a5747245f94ece5878eadb2c28ef9f921a131be2e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dabf40b4f17dab2c551a97a5747245f94ece5878eadb2c28ef9f921a131be2e6", kill_on_drop: false }`
[INFO] [stdout] dabf40b4f17dab2c551a97a5747245f94ece5878eadb2c28ef9f921a131be2e6
