[INFO] cloning repository https://github.com/hcsch/crsp
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hcsch/crsp" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhcsch%2Fcrsp", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhcsch%2Fcrsp'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a43eb93dc8a9785f3cb1a72328735c7b6ace24bf
[INFO] documenting hcsch/crsp 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%2Fhcsch%2Fcrsp" "/workspace/builds/worker-56/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-56/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hcsch/crsp 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/hcsch/crsp
[INFO] finished tweaking git repo https://github.com/hcsch/crsp
[INFO] tweaked toml for git repo https://github.com/hcsch/crsp written to /workspace/builds/worker-56/source/Cargo.toml
[INFO] crate git repo https://github.com/hcsch/crsp 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 }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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] 73872e7b2c1fc9cab28da9219812a88cbef0faeeaf02bd7fbc882ffb8816bc92
[INFO] running `Command { std: "docker" "start" "-a" "73872e7b2c1fc9cab28da9219812a88cbef0faeeaf02bd7fbc882ffb8816bc92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "73872e7b2c1fc9cab28da9219812a88cbef0faeeaf02bd7fbc882ffb8816bc92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73872e7b2c1fc9cab28da9219812a88cbef0faeeaf02bd7fbc882ffb8816bc92", kill_on_drop: false }`
[INFO] [stdout] 73872e7b2c1fc9cab28da9219812a88cbef0faeeaf02bd7fbc882ffb8816bc92
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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] 92d0ff368dfc9024e2c8832f9c3f79e2d24e2580a748fd3ef8542f1c83d45feb
[INFO] running `Command { std: "docker" "start" "-a" "92d0ff368dfc9024e2c8832f9c3f79e2d24e2580a748fd3ef8542f1c83d45feb", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.97
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[INFO] [stderr]     Checking parking_lot v0.11.1
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[INFO] [stderr]    Compiling toml v0.5.8
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[INFO] [stderr]    Compiling proc-macro-crate v0.1.5
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[INFO] [stderr]    Compiling thiserror-impl v1.0.25
[INFO] [stderr]    Compiling pin-project-internal v1.0.7
[INFO] [stderr]    Compiling tracing-attributes v0.1.15
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling num_enum_derive v0.5.1
[INFO] [stderr]    Compiling derive_more v0.99.14
[INFO] [stderr]    Compiling clap_derive v3.0.0-beta.2
[INFO] [stderr]     Checking wayland-cursor v0.28.6
[INFO] [stderr]     Checking thiserror v1.0.25
[INFO] [stderr]     Checking clap v3.0.0-beta.2
[INFO] [stderr]     Checking naga v0.4.2
[INFO] [stderr]     Checking minimp3 v0.5.1
[INFO] [stderr]     Checking num_enum v0.5.1
[INFO] [stderr]     Checking tracing v0.1.26
[INFO] [stderr]     Checking pin-project v1.0.7
[INFO] [stderr]     Checking flume v0.10.7
[INFO] [stderr]     Checking tracing-subscriber v0.2.19
[INFO] [stderr]     Checking rodio v0.14.0
[INFO] [stderr]     Checking crsp-base v0.2.0 (/opt/rustwide/workdir/crsp-base)
[INFO] [stderr]  Documenting crsp-base v0.2.0 (/opt/rustwide/workdir/crsp-base)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> crsp-base/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(variant_count, step_trait)]
[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 `crsp-base`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name crsp_base crsp-base/src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-b288e99e16252378.so --extern flume=/opt/rustwide/target/debug/deps/libflume-a54ca2813c84b28d.rmeta --extern num_enum=/opt/rustwide/target/debug/deps/libnum_enum-f471c059e92ff3f9.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-07ec062367e25670.rmeta --extern spin_sleep=/opt/rustwide/target/debug/deps/libspin_sleep-ca8744a04e0c3b8e.rmeta --extern static_assertions=/opt/rustwide/target/debug/deps/libstatic_assertions-140fe15ab40ccc28.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-62f4012c2f1553b4.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-d6e125755d5e2572.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> crsp-base/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(variant_count, step_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "92d0ff368dfc9024e2c8832f9c3f79e2d24e2580a748fd3ef8542f1c83d45feb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92d0ff368dfc9024e2c8832f9c3f79e2d24e2580a748fd3ef8542f1c83d45feb", kill_on_drop: false }`
[INFO] [stdout] 92d0ff368dfc9024e2c8832f9c3f79e2d24e2580a748fd3ef8542f1c83d45feb
