[INFO] fetching crate myelin-engine 0.14.1...
[INFO] checking myelin-engine-0.14.1 against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] extracting crate myelin-engine 0.14.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate myelin-engine 0.14.1 on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1/source/rust-toolchain
[INFO] started tweaking crates.io crate myelin-engine 0.14.1
[INFO] finished tweaking crates.io crate myelin-engine 0.14.1
[INFO] tweaked toml for crates.io crate myelin-engine 0.14.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 57b356460979f9997f0a249c409e91a74c75bd3fe8b53623ece9e19fef68a2ac
[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" "57b356460979f9997f0a249c409e91a74c75bd3fe8b53623ece9e19fef68a2ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57b356460979f9997f0a249c409e91a74c75bd3fe8b53623ece9e19fef68a2ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57b356460979f9997f0a249c409e91a74c75bd3fe8b53623ece9e19fef68a2ac", kill_on_drop: false }`
[INFO] [stdout] 57b356460979f9997f0a249c409e91a74c75bd3fe8b53623ece9e19fef68a2ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "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] 252be4e59246401bbcb716ff9f9e060a6b37945a77e70f7c2e9f2d4cdc005a59
[INFO] running `Command { std: "docker" "start" "-a" "252be4e59246401bbcb716ff9f9e060a6b37945a77e70f7c2e9f2d4cdc005a59", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]     Checking downcast-rs v1.2.0
[INFO] [stderr]     Checking slotmap v0.3.1
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]     Checking nameof v1.2.1
[INFO] [stderr]     Checking nearly_eq v0.2.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking generational-arena v0.2.8
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]    Compiling mockiato-codegen v0.9.5
[INFO] [stderr]    Compiling mockiato v0.9.5
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking alga v0.9.3
[INFO] [stderr]     Checking nalgebra v0.18.1
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mockiato-0.9.5/src/lib.rs:110:48
[INFO] [stdout]     |
[INFO] [stdout] 110 | #![cfg_attr(rustc_is_nightly, feature(doc_cfg, external_doc, specialization))]
[INFO] [stdout]     |                                                ^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]     |
[INFO] [stdout]     = note: use #[doc = include_str!("filename")] instead, which handles macro invocations
[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 E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mockiato`
[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" "252be4e59246401bbcb716ff9f9e060a6b37945a77e70f7c2e9f2d4cdc005a59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "252be4e59246401bbcb716ff9f9e060a6b37945a77e70f7c2e9f2d4cdc005a59", kill_on_drop: false }`
[INFO] [stdout] 252be4e59246401bbcb716ff9f9e060a6b37945a77e70f7c2e9f2d4cdc005a59