[INFO] cloning repository https://github.com/PewPewPewcoding/rengi-torvus
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PewPewPewcoding/rengi-torvus" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPewPewPewcoding%2Frengi-torvus", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPewPewPewcoding%2Frengi-torvus'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9a9692e8afc57167bf2f2d6745aa62ccefd52947
[INFO] testing PewPewPewcoding/rengi-torvus against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPewPewPewcoding%2Frengi-torvus" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PewPewPewcoding/rengi-torvus on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/PewPewPewcoding/rengi-torvus
[INFO] finished tweaking git repo https://github.com/PewPewPewcoding/rengi-torvus
[INFO] tweaked toml for git repo https://github.com/PewPewPewcoding/rengi-torvus written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/PewPewPewcoding/rengi-torvus already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hibitset v0.5.4
[INFO] [stderr]   Downloaded shred v0.7.2
[INFO] [stderr]   Downloaded nonzero_signed v1.0.3
[INFO] [stderr]   Downloaded shrev v1.1.1
[INFO] [stderr]   Downloaded sum_type v0.1.1
[INFO] [stderr]   Downloaded dot_vox v4.0.0
[INFO] [stderr]   Downloaded specs v0.14.3
[INFO] [stderr]   Downloaded vek v0.9.7
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", 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] d514163f3c6dac7eed5d8b7d3e804d1a1bf8acd595817b366fac77666ba954d4
[INFO] running `Command { std: "docker" "start" "-a" "d514163f3c6dac7eed5d8b7d3e804d1a1bf8acd595817b366fac77666ba954d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d514163f3c6dac7eed5d8b7d3e804d1a1bf8acd595817b366fac77666ba954d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d514163f3c6dac7eed5d8b7d3e804d1a1bf8acd595817b366fac77666ba954d4", kill_on_drop: false }`
[INFO] [stdout] d514163f3c6dac7eed5d8b7d3e804d1a1bf8acd595817b366fac77666ba954d4
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b7dcb3a88e572f15895294559b2843d3827110f75011ee9a6a01c86cfc96480f
[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" "b7dcb3a88e572f15895294559b2843d3827110f75011ee9a6a01c86cfc96480f", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling cfg-if v0.1.9
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling rayon-core v1.5.0
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling serde v1.0.94
[INFO] [stderr]    Compiling nonzero_signed v1.0.3
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]    Compiling atom v0.3.5
[INFO] [stderr]    Compiling mopa v0.2.2
[INFO] [stderr]    Compiling tuple_utils v0.2.0
[INFO] [stderr]    Compiling shrev v1.1.1
[INFO] [stderr]    Compiling static_assertions v0.2.5
[INFO] [stderr]    Compiling approx v0.1.1
[INFO] [stderr]    Compiling lazycell v1.2.1
[INFO] [stderr]    Compiling byteorder v0.5.3
[INFO] [stderr]    Compiling sum_type v0.1.1
[INFO] [stderr]    Compiling owning_ref v0.4.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling crossbeam-utils v0.6.5
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling inflate v0.4.5
[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/sum_type-0.1.1/src/lib.rs:181:35
[INFO] [stdout]     |
[INFO] [stdout] 181 | #![cfg_attr(feature = "try_from", feature(try_from))]
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand_core v0.3.1
[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 `sum_type`
[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" "b7dcb3a88e572f15895294559b2843d3827110f75011ee9a6a01c86cfc96480f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7dcb3a88e572f15895294559b2843d3827110f75011ee9a6a01c86cfc96480f", kill_on_drop: false }`
[INFO] [stdout] b7dcb3a88e572f15895294559b2843d3827110f75011ee9a6a01c86cfc96480f