[INFO] fetching crate ddcore-rs 0.2.4...
[INFO] testing ddcore-rs-0.2.4 against 1.59.0 for beta-1.60-1
[INFO] extracting crate ddcore-rs 0.2.4 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate ddcore-rs 0.2.4 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ddcore-rs 0.2.4
[INFO] finished tweaking crates.io crate ddcore-rs 0.2.4
[INFO] tweaked toml for crates.io crate ddcore-rs 0.2.4 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate ddcore-rs 0.2.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8822dca54db03a8924ceee9065f73aab6f37aa658a005b805f4fae66cca65a3f
[INFO] running `Command { std: "docker" "start" "-a" "8822dca54db03a8924ceee9065f73aab6f37aa658a005b805f4fae66cca65a3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8822dca54db03a8924ceee9065f73aab6f37aa658a005b805f4fae66cca65a3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8822dca54db03a8924ceee9065f73aab6f37aa658a005b805f4fae66cca65a3f", kill_on_drop: false }`
[INFO] [stdout] 8822dca54db03a8924ceee9065f73aab6f37aa658a005b805f4fae66cca65a3f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e4198c2bae01b255c0fcec83651742c53749bd5079cb8534ad5a8543480b05c
[INFO] running `Command { std: "docker" "start" "-a" "2e4198c2bae01b255c0fcec83651742c53749bd5079cb8534ad5a8543480b05c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling rle-decode-fast v1.0.1
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling anyhow v1.0.44
[INFO] [stderr]    Compiling adler32 v1.2.0
[INFO] [stderr]    Compiling md5 v0.7.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling bytestream v0.4.1
[INFO] [stderr]    Compiling libflate_lz77 v1.1.0
[INFO] [stderr]    Compiling libflate v1.1.1
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling ddcore-rs v0.2.4 (/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" "2e4198c2bae01b255c0fcec83651742c53749bd5079cb8534ad5a8543480b05c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e4198c2bae01b255c0fcec83651742c53749bd5079cb8534ad5a8543480b05c", kill_on_drop: false }`
[INFO] [stdout] 2e4198c2bae01b255c0fcec83651742c53749bd5079cb8534ad5a8543480b05c