[INFO] cloning repository https://github.com/ChristopherBiscardi/digital-garden
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ChristopherBiscardi/digital-garden" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChristopherBiscardi%2Fdigital-garden", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChristopherBiscardi%2Fdigital-garden'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 95d2d82364305ce39150bc2e8301bf6adece1696
[INFO] checking ChristopherBiscardi/digital-garden against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChristopherBiscardi%2Fdigital-garden" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ChristopherBiscardi/digital-garden on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ChristopherBiscardi/digital-garden
[INFO] finished tweaking git repo https://github.com/ChristopherBiscardi/digital-garden
[INFO] tweaked toml for git repo https://github.com/ChristopherBiscardi/digital-garden written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/ChristopherBiscardi/digital-garden already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f27ada5ae3297baf7324644395c8dff706be473442c78149edc2e683556fb059
[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" "f27ada5ae3297baf7324644395c8dff706be473442c78149edc2e683556fb059", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f27ada5ae3297baf7324644395c8dff706be473442c78149edc2e683556fb059", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f27ada5ae3297baf7324644395c8dff706be473442c78149edc2e683556fb059", kill_on_drop: false }`
[INFO] [stdout] f27ada5ae3297baf7324644395c8dff706be473442c78149edc2e683556fb059
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 35a07cc7584da500b0a4c2d8d1418f80ee7ae1bd4eeda8ec282d52ffacedcdfd
[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" "35a07cc7584da500b0a4c2d8d1418f80ee7ae1bd4eeda8ec282d52ffacedcdfd", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.79
[INFO] [stderr]    Compiling syn v1.0.55
[INFO] [stderr]     Checking regex-syntax v0.6.19
[INFO] [stderr]     Checking pin-project-lite v0.1.10
[INFO] [stderr]    Compiling eyre v0.6.1
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]    Compiling pulldown-cmark v0.8.0
[INFO] [stderr]     Checking rustc-demangle v0.1.17
[INFO] [stderr]     Checking zeroize v0.9.3
[INFO] [stderr]     Checking rprompt v1.0.5
[INFO] [stderr]     Checking sharded-slab v0.0.9
[INFO] [stderr]    Compiling escargot v0.5.0
[INFO] [stderr]     Checking num-integer v0.1.44
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking tracing-subscriber v0.2.13
[INFO] [stderr]     Checking getrandom v0.1.15
[INFO] [stderr]     Checking parking_lot_core v0.8.2
[INFO] [stderr]     Checking mio v0.7.6
[INFO] [stderr]     Checking signal-hook-registry v1.2.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking terminal_size v0.1.15
[INFO] [stderr]     Checking which v3.1.1
[INFO] [stderr]     Checking flate2 v1.0.19
[INFO] [stderr]     Checking backtrace v0.3.52
[INFO] [stderr]     Checking dirs-sys v0.3.5
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking directories v3.0.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking crossterm v0.18.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking regex v1.4.0
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking edit v0.1.2
[INFO] [stderr]     Checking console v0.13.0
[INFO] [stderr]     Checking globset v0.4.5
[INFO] [stderr]     Checking predicates v1.0.5
[INFO] [stderr]     Checking ignore v0.4.16
[INFO] [stderr]     Checking dialoguer v0.7.1
[INFO] [stderr]     Checking assert_cmd v1.0.1
[INFO] [stderr]     Checking globwalk v0.7.3
[INFO] [stderr]     Checking assert_fs v1.0.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling serde_derive v1.0.116
[INFO] [stderr]    Compiling tracing-attributes v0.1.11
[INFO] [stderr]    Compiling thiserror-impl v1.0.22
[INFO] [stderr]    Compiling structopt-derive v0.4.12
[INFO] [stderr]     Checking tracing v0.1.21
[INFO] [stderr]     Checking thiserror v1.0.22
[INFO] [stderr]     Checking tracing-error v0.1.2
[INFO] [stderr]     Checking minus v2.1.0
[INFO] [stderr]     Checking structopt v0.3.19
[INFO] [stderr]     Checking color-spantrace v0.1.4
[INFO] [stderr]     Checking color-eyre v0.5.6
[INFO] [stderr]     Checking serde v1.0.116
[INFO] [stderr]     Checking serde_json v1.0.58
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking plist v1.0.0
[INFO] [stderr]     Checking syntect v4.5.0
[INFO] [stderr]     Checking digital-garden v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(bool_to_option)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(bool_to_option)]
[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 `digital-garden` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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" "35a07cc7584da500b0a4c2d8d1418f80ee7ae1bd4eeda8ec282d52ffacedcdfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35a07cc7584da500b0a4c2d8d1418f80ee7ae1bd4eeda8ec282d52ffacedcdfd", kill_on_drop: false }`
[INFO] [stdout] 35a07cc7584da500b0a4c2d8d1418f80ee7ae1bd4eeda8ec282d52ffacedcdfd