[INFO] fetching crate flv-api-sc 1.2.0...
[INFO] checking flv-api-sc-1.2.0 against master#cfbc6d4cf1acbac5c025acf8ed68929caa551df3 for pr-75494-beta
[INFO] extracting crate flv-api-sc 1.2.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate flv-api-sc 1.2.0 on toolchain cfbc6d4cf1acbac5c025acf8ed68929caa551df3
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flv-api-sc 1.2.0
[INFO] finished tweaking crates.io crate flv-api-sc 1.2.0
[INFO] tweaked toml for crates.io crate flv-api-sc 1.2.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9c1b10e711388af87a5b8d48ad96198151d993a16ba2d8d81ea7207a3ed85c4c
[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" "9c1b10e711388af87a5b8d48ad96198151d993a16ba2d8d81ea7207a3ed85c4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c1b10e711388af87a5b8d48ad96198151d993a16ba2d8d81ea7207a3ed85c4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c1b10e711388af87a5b8d48ad96198151d993a16ba2d8d81ea7207a3ed85c4c", kill_on_drop: false }`
[INFO] [stdout] 9c1b10e711388af87a5b8d48ad96198151d993a16ba2d8d81ea7207a3ed85c4c
[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" "RUSTFLAGS=--cap-lints=forbid" "-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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fd86d29b06445d450030647ef4cb7ec7c96a49c017f99fa3c4a297bcd82ab39b
[INFO] running `Command { std: "docker" "start" "-a" "fd86d29b06445d450030647ef4cb7ec7c96a49c017f99fa3c4a297bcd82ab39b", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.67
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling bumpalo v3.4.0
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling wasm-bindgen v0.2.67
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking termcolor v1.1.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling nix v0.17.0
[INFO] [stderr]    Compiling crc32c v0.4.0
[INFO] [stderr]     Checking scoped-tls v1.0.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking futures-timer v2.0.2
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking async-channel v1.4.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking polling v0.1.5
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking error-chain v0.12.4
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]     Checking futures-lite v0.1.11
[INFO] [stderr]     Checking content_inspector v0.2.4
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking flv-types v0.1.0
[INFO] [stderr]     Checking flv-types v0.2.2
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]     Checking async-io v0.1.11
[INFO] [stderr]     Checking blocking v0.5.2
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking async-executor v0.1.2
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]     Checking flv-util v0.2.1
[INFO] [stderr]     Checking flv-util v0.1.1
[INFO] [stderr]    Compiling kf-protocol-derive v0.1.1
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.67
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.67
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling async-trait v0.1.38
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.67
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking js-sys v0.3.44
[INFO] [stderr]     Checking serde v1.0.115
[INFO] [stderr]     Checking web-sys v0.3.44
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking gloo-timers v0.2.1
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking async-std v1.6.3
[INFO] [stderr]     Checking serde_qs v0.4.6
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking kf-protocol-core v0.1.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/kf-protocol-core-0.1.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[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: could not compile `kf-protocol-core`.
[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" "fd86d29b06445d450030647ef4cb7ec7c96a49c017f99fa3c4a297bcd82ab39b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd86d29b06445d450030647ef4cb7ec7c96a49c017f99fa3c4a297bcd82ab39b", kill_on_drop: false }`
[INFO] [stdout] fd86d29b06445d450030647ef4cb7ec7c96a49c017f99fa3c4a297bcd82ab39b
