[INFO] fetching crate json-ld 0.6.1...
[INFO] testing json-ld-0.6.1 against 1.59.0 for beta-1.60-1
[INFO] extracting crate json-ld 0.6.1 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate json-ld 0.6.1 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate json-ld 0.6.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate json-ld 0.6.1
[INFO] tweaked toml for crates.io crate json-ld 0.6.1 written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] crate crates.io crate json-ld 0.6.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3eacc0f7929d520064a60f3bdda43ffd1f82d23f913e929a7b4221c476a67e42
[INFO] running `Command { std: "docker" "start" "-a" "3eacc0f7929d520064a60f3bdda43ffd1f82d23f913e929a7b4221c476a67e42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3eacc0f7929d520064a60f3bdda43ffd1f82d23f913e929a7b4221c476a67e42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3eacc0f7929d520064a60f3bdda43ffd1f82d23f913e929a7b4221c476a67e42", kill_on_drop: false }`
[INFO] [stdout] 3eacc0f7929d520064a60f3bdda43ffd1f82d23f913e929a7b4221c476a67e42
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b2f7f3fafa19926ab61169aacb1b696f31e007dbe74a0e787070e027ff20170b
[INFO] running `Command { std: "docker" "start" "-a" "b2f7f3fafa19926ab61169aacb1b696f31e007dbe74a0e787070e027ff20170b", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.85
[INFO] [stderr]    Compiling futures-core v0.3.19
[INFO] [stderr]    Compiling futures-channel v0.3.19
[INFO] [stderr]    Compiling serde v1.0.133
[INFO] [stderr]    Compiling futures-task v0.3.19
[INFO] [stderr]    Compiling serde_json v1.0.74
[INFO] [stderr]    Compiling futures-sink v0.3.19
[INFO] [stderr]    Compiling futures-util v0.3.19
[INFO] [stderr]    Compiling futures-io v0.3.19
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling pct-str v1.1.0
[INFO] [stderr]    Compiling mown v0.2.1
[INFO] [stderr]    Compiling langtag v0.2.0
[INFO] [stderr]    Compiling value-bag v1.0.0-alpha.8
[INFO] [stderr]    Compiling quote v1.0.14
[INFO] [stderr]    Compiling iref v2.1.0
[INFO] [stderr]    Compiling futures-macro v0.3.19
[INFO] [stderr]    Compiling ctor v0.1.21
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling cc-traits v0.7.3
[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/cc-traits-0.7.3/src/lib.rs:104:1
[INFO] [stdout]     |
[INFO] [stdout] 104 | #![feature(generic_associated_types)]
[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 `cc-traits` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b2f7f3fafa19926ab61169aacb1b696f31e007dbe74a0e787070e027ff20170b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2f7f3fafa19926ab61169aacb1b696f31e007dbe74a0e787070e027ff20170b", kill_on_drop: false }`
[INFO] [stdout] b2f7f3fafa19926ab61169aacb1b696f31e007dbe74a0e787070e027ff20170b