[INFO] fetching crate r3_port_riscv 0.1.3...
[INFO] testing r3_port_riscv-0.1.3 against 1.59.0 for beta-1.60-1
[INFO] extracting crate r3_port_riscv 0.1.3 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate r3_port_riscv 0.1.3 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 r3_port_riscv 0.1.3
[INFO] finished tweaking crates.io crate r3_port_riscv 0.1.3
[INFO] tweaked toml for crates.io crate r3_port_riscv 0.1.3 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 33659f5fa3d67a14642d1123b88b7e5fafe39868f66ae8c6ca41cd6ca48bf3a4
[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" "33659f5fa3d67a14642d1123b88b7e5fafe39868f66ae8c6ca41cd6ca48bf3a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33659f5fa3d67a14642d1123b88b7e5fafe39868f66ae8c6ca41cd6ca48bf3a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33659f5fa3d67a14642d1123b88b7e5fafe39868f66ae8c6ca41cd6ca48bf3a4", kill_on_drop: false }`
[INFO] [stdout] 33659f5fa3d67a14642d1123b88b7e5fafe39868f66ae8c6ca41cd6ca48bf3a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] b253e36fa56450e4e57d82c43b59e58cc5c9ca3f1bafb0b7c4b758b772131268
[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" "b253e36fa56450e4e57d82c43b59e58cc5c9ca3f1bafb0b7c4b758b772131268", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling bare-metal v1.0.0
[INFO] [stderr]    Compiling r0 v1.0.0
[INFO] [stderr]    Compiling tock-registers v0.7.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling riscv-target v0.1.2
[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/tock-registers-0.7.0/src/lib.rs:56:1
[INFO] [stdout]    |
[INFO] [stdout] 56 | #![feature(const_fn_trait_bound)]
[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 `tock-registers` 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" "b253e36fa56450e4e57d82c43b59e58cc5c9ca3f1bafb0b7c4b758b772131268", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b253e36fa56450e4e57d82c43b59e58cc5c9ca3f1bafb0b7c4b758b772131268", kill_on_drop: false }`
[INFO] [stdout] b253e36fa56450e4e57d82c43b59e58cc5c9ca3f1bafb0b7c4b758b772131268