[INFO] fetching crate grades 0.1.1...
[INFO] testing grades-0.1.1 against beta-2023-04-20 for beta-1.70-1
[INFO] extracting crate grades 0.1.1 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate grades 0.1.1 on toolchain beta-2023-04-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate grades 0.1.1
[INFO] finished tweaking crates.io crate grades 0.1.1
[INFO] tweaked toml for crates.io crate grades 0.1.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate grades 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fraction v0.13.1
[INFO] [stderr]   Downloaded unsafe-libyaml v0.2.7
[INFO] [stderr]   Downloaded serde_derive v1.0.154
[INFO] [stderr]   Downloaded serde v1.0.154
[INFO] [stderr]   Downloaded serde_yaml v0.9.19
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8011b86b6ca7f3f8c5f6722a953ecdcf150946c4fef3bb5b1d51cd2932fc20b2
[INFO] running `Command { std: "docker" "start" "-a" "8011b86b6ca7f3f8c5f6722a953ecdcf150946c4fef3bb5b1d51cd2932fc20b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8011b86b6ca7f3f8c5f6722a953ecdcf150946c4fef3bb5b1d51cd2932fc20b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8011b86b6ca7f3f8c5f6722a953ecdcf150946c4fef3bb5b1d51cd2932fc20b2", kill_on_drop: false }`
[INFO] [stdout] 8011b86b6ca7f3f8c5f6722a953ecdcf150946c4fef3bb5b1d51cd2932fc20b2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] af937a1a843692ce63197273d60c7a589f4406bc6bd5e6276dcc7237ed928478
[INFO] running `Command { std: "docker" "start" "-a" "af937a1a843692ce63197273d60c7a589f4406bc6bd5e6276dcc7237ed928478", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling serde_derive v1.0.154
[INFO] [stderr]    Compiling io-lifetimes v1.0.6
[INFO] [stderr]    Compiling rustix v0.36.9
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling serde v1.0.154
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]    Compiling linux-raw-sys v0.1.4
[INFO] [stderr]    Compiling os_str_bytes v6.4.1
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]    Compiling hashbrown v0.12.3
[INFO] [stderr]    Compiling dirs-sys v0.3.7
[INFO] [stderr]    Compiling clap_lex v0.3.2
[INFO] [stderr]    Compiling termcolor v1.2.0
[INFO] [stderr]    Compiling num-complex v0.4.3
[INFO] [stderr]    Compiling dirs v4.0.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling base64 v0.13.1
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling yansi v0.5.1
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling ryu v1.0.13
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling unsafe-libyaml v0.2.7
[INFO] [stderr]    Compiling is-terminal v0.4.4
[INFO] [stderr]    Compiling diff v0.1.13
[INFO] [stderr]    Compiling xdg v2.4.1
[INFO] [stderr]    Compiling pretty_assertions v1.3.0
[INFO] [stderr]    Compiling num v0.4.0
[INFO] [stderr]    Compiling fraction v0.13.1
[INFO] [stderr]    Compiling clap_derive v4.1.8
[INFO] [stderr]    Compiling clap v4.1.8
[INFO] [stderr]    Compiling ron v0.8.0
[INFO] [stderr]    Compiling serde_yaml v0.9.19
[INFO] [stderr]    Compiling grades v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_group_by)]
[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 `grades` (bin "grades") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "af937a1a843692ce63197273d60c7a589f4406bc6bd5e6276dcc7237ed928478", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af937a1a843692ce63197273d60c7a589f4406bc6bd5e6276dcc7237ed928478", kill_on_drop: false }`
[INFO] [stdout] af937a1a843692ce63197273d60c7a589f4406bc6bd5e6276dcc7237ed928478
