[INFO] cloning repository https://github.com/orlovskiyandrey/super-duper-parakeet
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/orlovskiyandrey/super-duper-parakeet" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Forlovskiyandrey%2Fsuper-duper-parakeet", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Forlovskiyandrey%2Fsuper-duper-parakeet'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5192cef020714fe1b77db49889ebf9caedf9b2b3
[INFO] documenting orlovskiyandrey/super-duper-parakeet 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%2Forlovskiyandrey%2Fsuper-duper-parakeet" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/orlovskiyandrey/super-duper-parakeet 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] removed /workspace/builds/worker-3/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/orlovskiyandrey/super-duper-parakeet
[INFO] finished tweaking git repo https://github.com/orlovskiyandrey/super-duper-parakeet
[INFO] tweaked toml for git repo https://github.com/orlovskiyandrey/super-duper-parakeet written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/orlovskiyandrey/super-duper-parakeet 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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 4eedabe5a9f84a797a040e95cd14d15fd21904eaaf1ddb549d999b0428afd715
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4eedabe5a9f84a797a040e95cd14d15fd21904eaaf1ddb549d999b0428afd715", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4eedabe5a9f84a797a040e95cd14d15fd21904eaaf1ddb549d999b0428afd715", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4eedabe5a9f84a797a040e95cd14d15fd21904eaaf1ddb549d999b0428afd715", kill_on_drop: false }`
[INFO] [stdout] 4eedabe5a9f84a797a040e95cd14d15fd21904eaaf1ddb549d999b0428afd715
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 87cb502e4336e50e996c28e7d5be957f0da2ca3b63383c7b86bdb91ca37f3a2a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "87cb502e4336e50e996c28e7d5be957f0da2ca3b63383c7b86bdb91ca37f3a2a", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.5
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[INFO] [stderr]  Documenting serializer_tests v0.1.0 (/opt/rustwide/workdir/language/vm/serializer_tests)
[INFO] [stderr]  Documenting failure_macros v0.1.0 (/opt/rustwide/workdir/common/failure_ext/failure_macros)
[INFO] [stderr]  Documenting testsuite v0.1.0 (/opt/rustwide/workdir/testsuite)
[INFO] [stderr]  Documenting bytecode_verifier_tests v0.1.0 (/opt/rustwide/workdir/language/bytecode_verifier/bytecode_verifier_tests)
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[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling proptest-derive v0.1.2
[INFO] [stderr]    Compiling rental-impl v0.5.4
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]    Compiling strum_macros v0.15.0
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[INFO] [stderr]    Compiling sha2 v0.8.0
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[INFO] [stderr]    Compiling cmake v0.1.42
[INFO] [stderr]     Checking parking_lot_core v0.4.0
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[INFO] [stderr]     Checking tools v0.1.0 (/opt/rustwide/workdir/common/tools)
[INFO] [stderr]     Checking backoff v0.1.5
[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]  Documenting tools v0.1.0 (/opt/rustwide/workdir/common/tools)
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking rand v0.7.0
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[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling clear_on_drop v0.2.3
[INFO] [stderr]    Compiling ring v0.14.6
[INFO] [stderr]    Compiling lz4-sys v1.8.0 (https://github.com/busyjay/lz4-rs.git?branch=adjust-build#41509fea)
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling bzip2-sys v0.1.7 (https://github.com/alexcrichton/bzip2-rs.git#02096d6f)
[INFO] [stderr]    Compiling zstd-sys v1.4.13+zstd.1.4.3 (https://github.com/gyscos/zstd-rs.git#7f77d098)
[INFO] [stderr]    Compiling jemalloc-sys v0.3.2
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
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[INFO] [stderr]     Checking protobuf-codegen v2.7.0
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking unsigned-varint v0.2.2
[INFO] [stderr]    Compiling grpcio-sys v0.4.4
[INFO] [stderr]    Compiling snappy-sys v0.1.0 (https://github.com/busyjay/rust-snappy.git?branch=static-link#8c12738b)
[INFO] [stderr]    Compiling libtitan_sys v0.0.1 (https://github.com/pingcap/rust-rocksdb.git?rev=ea24c53b8f2e1f8a1d22f739cb5db4681d2d21ff#ea24c53b)
[INFO] [stderr]    Compiling librocksdb_sys v0.1.0 (https://github.com/pingcap/rust-rocksdb.git?rev=ea24c53b8f2e1f8a1d22f739cb5db4681d2d21ff#ea24c53b)
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]    Compiling string_cache_codegen v0.4.2
[INFO] [stderr]     Checking vm_cache_map v0.1.0 (/opt/rustwide/workdir/language/vm/vm_runtime/vm_cache_map)
[INFO] [stderr]  Documenting vm_cache_map v0.1.0 (/opt/rustwide/workdir/language/vm/vm_runtime/vm_cache_map)
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]  Documenting proto_conv_derive v0.1.0 (/opt/rustwide/workdir/common/proto_conv/proto_conv_derive)
[INFO] [stderr]  Documenting crypto_derive v0.1.0 (/opt/rustwide/workdir/crypto/crypto_derive)
[INFO] [stderr]     Checking tempfile v3.1.0
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[INFO] [stderr]     Checking num v0.2.0
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[INFO] [stderr]     Checking rusty-fork v0.2.2
[INFO] [stderr]    Compiling string_cache v0.7.3
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[INFO] [stderr]     Checking crossbeam v0.7.2
[INFO] [stderr]     Checking rayon-core v1.6.0
[INFO] [stderr]     Checking tokio-udp v0.1.5
[INFO] [stderr]     Checking tokio-uds v0.2.5
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio-signal v0.2.7
[INFO] [stderr]     Checking proptest v0.9.4
[INFO] [stderr]     Checking slog-stdlog v4.0.0
[INFO] [stderr]    Compiling protoc-rust v2.7.0
[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]    Compiling derive-new v0.5.8
[INFO] [stderr]    Compiling proto_conv_derive v0.1.0 (/opt/rustwide/workdir/common/proto_conv/proto_conv_derive)
[INFO] [stderr]    Compiling crypto_derive v0.1.0 (/opt/rustwide/workdir/crypto/crypto_derive)
[INFO] [stderr]    Compiling proc-macro-hack v0.5.9
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking rayon v1.2.0
[INFO] [stderr]     Checking tokio-process v0.2.4
[INFO] [stderr]     Checking webpki v0.19.1
[INFO] [stderr]     Checking sct v0.5.0
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]    Compiling grpcio-compiler v0.5.0-alpha.2
[INFO] [stderr]     Checking ct-logs v0.5.1
[INFO] [stderr]     Checking proptest_helpers v0.1.0 (/opt/rustwide/workdir/common/proptest_helpers)
[INFO] [stderr]  Documenting proptest_helpers v0.1.0 (/opt/rustwide/workdir/common/proptest_helpers)
[INFO] [stderr]     Checking rustls v0.15.2
[INFO] [stderr]     Checking webpki-roots v0.16.0
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.17
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/futures-util-preview-0.3.0-alpha.17/src/lib.rs:4:38
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature = "async-await", feature(async_await))]
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tokio-rustls v0.9.3
[INFO] [stderr]     Checking hyper-rustls v0.16.1
[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: could not compile `futures-util-preview`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "87cb502e4336e50e996c28e7d5be957f0da2ca3b63383c7b86bdb91ca37f3a2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87cb502e4336e50e996c28e7d5be957f0da2ca3b63383c7b86bdb91ca37f3a2a", kill_on_drop: false }`
[INFO] [stdout] 87cb502e4336e50e996c28e7d5be957f0da2ca3b63383c7b86bdb91ca37f3a2a
