[INFO] fetching crate r3_port_riscv 0.1.1...
[INFO] testing r3_port_riscv-0.1.1 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate r3_port_riscv 0.1.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate r3_port_riscv 0.1.1 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate r3_port_riscv 0.1.1
[INFO] finished tweaking crates.io crate r3_port_riscv 0.1.1
[INFO] tweaked toml for crates.io crate r3_port_riscv 0.1.1 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded riscv v0.6.0
[INFO] [stderr]   Downloaded r0 v1.0.0
[INFO] [stderr]   Downloaded riscv-rt v0.8.0
[INFO] [stderr]   Downloaded riscv-target v0.1.2
[INFO] [stderr]   Downloaded riscv-rt-macros v0.1.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2ddd7507387db7303c18a0ef6ccfc40eea6eb587f83e7cccd138545d8ed02214
[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" "2ddd7507387db7303c18a0ef6ccfc40eea6eb587f83e7cccd138545d8ed02214", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2ddd7507387db7303c18a0ef6ccfc40eea6eb587f83e7cccd138545d8ed02214", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ddd7507387db7303c18a0ef6ccfc40eea6eb587f83e7cccd138545d8ed02214", kill_on_drop: false }`
[INFO] [stdout] 2ddd7507387db7303c18a0ef6ccfc40eea6eb587f83e7cccd138545d8ed02214
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6e69a52a1f130c89ebf1efba7d18c3272fae4e4eebba4a759efeeb3c4cbe747
[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" "c6e69a52a1f130c89ebf1efba7d18c3272fae4e4eebba4a759efeeb3c4cbe747", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling staticvec v0.10.5
[INFO] [stderr]    Compiling r0 v1.0.0
[INFO] [stderr]    Compiling tock-registers v0.5.0
[INFO] [stderr]    Compiling svgbob v0.4.1
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling riscv-target 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/tock-registers-0.5.0/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(const_fn)]
[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`
[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] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/staticvec-0.10.5/src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | / #![feature(
[INFO] [stdout] 32 | |   const_fn,
[INFO] [stdout] 33 | |   const_fn_union,
[INFO] [stdout] 34 | |   const_generics,
[INFO] [stdout] ...  |
[INFO] [stdout] 51 | |   untagged_unions
[INFO] [stdout] 52 | | )]
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "c6e69a52a1f130c89ebf1efba7d18c3272fae4e4eebba4a759efeeb3c4cbe747", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6e69a52a1f130c89ebf1efba7d18c3272fae4e4eebba4a759efeeb3c4cbe747", kill_on_drop: false }`
[INFO] [stdout] c6e69a52a1f130c89ebf1efba7d18c3272fae4e4eebba4a759efeeb3c4cbe747