[INFO] cloning repository https://github.com/tcrustifarians/rust-rack
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tcrustifarians/rust-rack" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftcrustifarians%2Frust-rack", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftcrustifarians%2Frust-rack'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fd13a10000dbdc674ed943f531f98f8ebdc3a210
[INFO] testing tcrustifarians/rust-rack against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftcrustifarians%2Frust-rack" "/workspace/builds/worker-28/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-28/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tcrustifarians/rust-rack on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tcrustifarians/rust-rack
[INFO] finished tweaking git repo https://github.com/tcrustifarians/rust-rack
[INFO] tweaked toml for git repo https://github.com/tcrustifarians/rust-rack written to /workspace/builds/worker-28/source/Cargo.toml
[INFO] crate git repo https://github.com/tcrustifarians/rust-rack already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 88665be298113191e55c8d87c2197931468feb7c2e4e4a7b4937623ecd364b8a
[INFO] running `Command { std: "docker" "start" "-a" "88665be298113191e55c8d87c2197931468feb7c2e4e4a7b4937623ecd364b8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88665be298113191e55c8d87c2197931468feb7c2e4e4a7b4937623ecd364b8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88665be298113191e55c8d87c2197931468feb7c2e4e4a7b4937623ecd364b8a", kill_on_drop: false }`
[INFO] [stdout] 88665be298113191e55c8d87c2197931468feb7c2e4e4a7b4937623ecd364b8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5feb63c89e2b0890f69120d4aa91c9e86fe15a34ab4279588a8b0cc7c7397cf8
[INFO] running `Command { std: "docker" "start" "-a" "5feb63c89e2b0890f69120d4aa91c9e86fe15a34ab4279588a8b0cc7c7397cf8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.1.10
[INFO] [stderr]    Compiling rack v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(cstr_to_str)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `cstr_to_str` has been stable since 1.4.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(cstr_to_str)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` 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 `rack` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "5feb63c89e2b0890f69120d4aa91c9e86fe15a34ab4279588a8b0cc7c7397cf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5feb63c89e2b0890f69120d4aa91c9e86fe15a34ab4279588a8b0cc7c7397cf8", kill_on_drop: false }`
[INFO] [stdout] 5feb63c89e2b0890f69120d4aa91c9e86fe15a34ab4279588a8b0cc7c7397cf8