[INFO] cloning repository https://github.com/Weltraumschaf/minivm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Weltraumschaf/minivm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWeltraumschaf%2Fminivm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWeltraumschaf%2Fminivm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6257253bbca9cc6ea5f83a3c6dca902dcd1d1f6
[INFO] testing Weltraumschaf/minivm against 1.47.0 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWeltraumschaf%2Fminivm" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Weltraumschaf/minivm on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Weltraumschaf/minivm
[INFO] finished tweaking git repo https://github.com/Weltraumschaf/minivm
[INFO] tweaked toml for git repo https://github.com/Weltraumschaf/minivm written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/Weltraumschaf/minivm already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4c0131aa1bcf1dc93215846dfa19ae370a49ffca223a6e67c250f54c8f0b36b1
[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" "4c0131aa1bcf1dc93215846dfa19ae370a49ffca223a6e67c250f54c8f0b36b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c0131aa1bcf1dc93215846dfa19ae370a49ffca223a6e67c250f54c8f0b36b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c0131aa1bcf1dc93215846dfa19ae370a49ffca223a6e67c250f54c8f0b36b1", kill_on_drop: false }`
[INFO] [stdout] 4c0131aa1bcf1dc93215846dfa19ae370a49ffca223a6e67c250f54c8f0b36b1
[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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--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] 80e09c97cf8b5354e29818544f8564f2ee8224fd4fff88cb1e7bf1ed3a163761
[INFO] running `Command { std: "docker" "start" "-a" "80e09c97cf8b5354e29818544f8564f2ee8224fd4fff88cb1e7bf1ed3a163761", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.36
[INFO] [stderr]    Compiling quick-error v1.2.1
[INFO] [stderr]    Compiling regex-syntax v0.4.2
[INFO] [stderr]    Compiling termcolor v0.3.5
[INFO] [stderr]    Compiling ansi_term v0.10.2
[INFO] [stderr]    Compiling textwrap v0.9.0
[INFO] [stderr]    Compiling thread_local v0.3.5
[INFO] [stderr]    Compiling humantime v1.1.0
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling atty v0.2.6
[INFO] [stderr]    Compiling clap v2.30.0
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling regex v0.2.6
[INFO] [stderr]    Compiling env_logger v0.5.4
[INFO] [stderr]    Compiling minivm v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_from)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/frontend/character_helper.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         (CharacterHelper::is_alphabetic(ch) || CharacterHelper::is_numeric(ch))
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `minivm`.
[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" "80e09c97cf8b5354e29818544f8564f2ee8224fd4fff88cb1e7bf1ed3a163761", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80e09c97cf8b5354e29818544f8564f2ee8224fd4fff88cb1e7bf1ed3a163761", kill_on_drop: false }`
[INFO] [stdout] 80e09c97cf8b5354e29818544f8564f2ee8224fd4fff88cb1e7bf1ed3a163761
