[INFO] fetching crate ssb-client 0.3.1...
[INFO] testing ssb-client-0.3.1 against 1.60.0 for beta-1.61-1
[INFO] extracting crate ssb-client 0.3.1 into /workspace/builds/worker-21/source
[INFO] validating manifest of crates.io crate ssb-client 0.3.1 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ssb-client 0.3.1
[INFO] finished tweaking crates.io crate ssb-client 0.3.1
[INFO] tweaked toml for crates.io crate ssb-client 0.3.1 written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ssb-rpc v0.3.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] be1242c41da34bf5176b3e37f6ee9546eecd0f6d59ec5c90644f46b691902f77
[INFO] running `Command { std: "docker" "start" "-a" "be1242c41da34bf5176b3e37f6ee9546eecd0f6d59ec5c90644f46b691902f77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be1242c41da34bf5176b3e37f6ee9546eecd0f6d59ec5c90644f46b691902f77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be1242c41da34bf5176b3e37f6ee9546eecd0f6d59ec5c90644f46b691902f77", kill_on_drop: false }`
[INFO] [stdout] be1242c41da34bf5176b3e37f6ee9546eecd0f6d59ec5c90644f46b691902f77
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3afb17b2b0dcb4ad1b93e9eba3c855d2cb1ef56bb0ef82867119a8b5d6d9bfce
[INFO] running `Command { std: "docker" "start" "-a" "3afb17b2b0dcb4ad1b93e9eba3c855d2cb1ef56bb0ef82867119a8b5d6d9bfce", kill_on_drop: false }`
[INFO] [stderr]    Compiling ordermap v0.3.5
[INFO] [stderr]    Compiling libsodium-sys v0.0.16
[INFO] [stderr]    Compiling secret_handshake v4.0.0
[INFO] [stderr]    Compiling box_stream v0.4.0
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling quickcheck v0.5.0
[INFO] [stderr]    Compiling tokio-threadpool v0.1.18
[INFO] [stderr]    Compiling multi-consumer-stream v0.3.0
[INFO] [stderr]    Compiling multi-producer-sink v0.3.0
[INFO] [stderr]    Compiling tokio-io v0.1.13
[INFO] [stderr]    Compiling atm-async-utils v0.1.2
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling sodiumoxide v0.0.16
[INFO] [stderr]    Compiling atm-io-utils v0.1.0
[INFO] [stderr]    Compiling tokio-reactor v0.1.12
[INFO] [stderr]    Compiling tokio-codec v0.1.2
[INFO] [stderr]    Compiling tokio-fs v0.1.7
[INFO] [stderr]    Compiling packet-stream-codec v0.1.0
[INFO] [stderr]    Compiling packet-stream v0.5.0
[INFO] [stderr]    Compiling tokio-udp v0.1.6
[INFO] [stderr]    Compiling tokio-tcp v0.1.4
[INFO] [stderr]    Compiling tokio-uds v0.2.7
[INFO] [stderr]    Compiling muxrpc v0.2.0
[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/secret_handshake-4.0.0/src/lib.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(unique)]
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `unique`
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/secret_handshake-4.0.0/src/lib.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(unique)]
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `secret_handshake` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3afb17b2b0dcb4ad1b93e9eba3c855d2cb1ef56bb0ef82867119a8b5d6d9bfce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3afb17b2b0dcb4ad1b93e9eba3c855d2cb1ef56bb0ef82867119a8b5d6d9bfce", kill_on_drop: false }`
[INFO] [stdout] 3afb17b2b0dcb4ad1b93e9eba3c855d2cb1ef56bb0ef82867119a8b5d6d9bfce