[INFO] fetching crate ddcore-rs 0.3.0...
[INFO] testing ddcore-rs-0.3.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate ddcore-rs 0.3.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate ddcore-rs 0.3.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ddcore-rs 0.3.0
[INFO] finished tweaking crates.io crate ddcore-rs 0.3.0
[INFO] tweaked toml for crates.io crate ddcore-rs 0.3.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate ddcore-rs 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cbc v0.1.1
[INFO] [stderr]   Downloaded inout v0.1.2
[INFO] [stderr]   Downloaded aes v0.8.1
[INFO] [stderr]   Downloaded bytestream v0.4.1
[INFO] [stderr]   Downloaded block-padding v0.3.1
[INFO] [stderr]   Downloaded process-memory v0.4.0
[INFO] [stderr]   Downloaded sysinfo v0.23.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "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] a761af59a4bbab296828601443485f97e38734648e3635d0472e892de0c7e3c6
[INFO] running `Command { std: "docker" "start" "-a" "a761af59a4bbab296828601443485f97e38734648e3635d0472e892de0c7e3c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a761af59a4bbab296828601443485f97e38734648e3635d0472e892de0c7e3c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a761af59a4bbab296828601443485f97e38734648e3635d0472e892de0c7e3c6", kill_on_drop: false }`
[INFO] [stdout] a761af59a4bbab296828601443485f97e38734648e3635d0472e892de0c7e3c6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "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] 0a577e5fbfe0d5387e274ea105ab3ea924ffc9f5e409f8751e36aa8cb3fbd55b
[INFO] running `Command { std: "docker" "start" "-a" "0a577e5fbfe0d5387e274ea105ab3ea924ffc9f5e409f8751e36aa8cb3fbd55b", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling anyhow v1.0.55
[INFO] [stderr]    Compiling md5 v0.7.0
[INFO] [stderr]    Compiling bytestream v0.4.1
[INFO] [stderr]    Compiling libflate v1.1.2
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling ddcore-rs v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(io_safety)]
[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 `ddcore-rs` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "0a577e5fbfe0d5387e274ea105ab3ea924ffc9f5e409f8751e36aa8cb3fbd55b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a577e5fbfe0d5387e274ea105ab3ea924ffc9f5e409f8751e36aa8cb3fbd55b", kill_on_drop: false }`
[INFO] [stdout] 0a577e5fbfe0d5387e274ea105ab3ea924ffc9f5e409f8751e36aa8cb3fbd55b