[INFO] fetching crate ndless-async 0.1.2...
[INFO] testing ndless-async-0.1.2 against 1.59.0 for beta-1.60-1
[INFO] extracting crate ndless-async 0.1.2 into /workspace/builds/worker-24/source
[INFO] validating manifest of crates.io crate ndless-async 0.1.2 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 ndless-async 0.1.2
[INFO] finished tweaking crates.io crate ndless-async 0.1.2
[INFO] tweaked toml for crates.io crate ndless-async 0.1.2 written to /workspace/builds/worker-24/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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] 720b4ffad7fe03f3a3529c55b3c16d6e64ae813939b33e47f7f577eba8599252
[INFO] running `Command { std: "docker" "start" "-a" "720b4ffad7fe03f3a3529c55b3c16d6e64ae813939b33e47f7f577eba8599252", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "720b4ffad7fe03f3a3529c55b3c16d6e64ae813939b33e47f7f577eba8599252", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "720b4ffad7fe03f3a3529c55b3c16d6e64ae813939b33e47f7f577eba8599252", kill_on_drop: false }`
[INFO] [stdout] 720b4ffad7fe03f3a3529c55b3c16d6e64ae813939b33e47f7f577eba8599252
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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] e1b8da4f1252c0d2f8c6dfa85ce370bc2364e1d634b573107f5da7b3d087bff1
[INFO] running `Command { std: "docker" "start" "-a" "e1b8da4f1252c0d2f8c6dfa85ce370bc2364e1d634b573107f5da7b3d087bff1", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling cty v0.2.2
[INFO] [stderr]    Compiling cty v0.1.5
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling ignore-result v0.2.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling ndless-static-vars v2.1.0
[INFO] [stderr]    Compiling ndless-sys v0.2.0
[INFO] [stderr]    Compiling cstr_core v0.1.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/cstr_core-0.1.2/src/lib.rs:12:40
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![cfg_attr(feature = "alloc", feature(alloc))]
[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 `cstr_core` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e1b8da4f1252c0d2f8c6dfa85ce370bc2364e1d634b573107f5da7b3d087bff1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1b8da4f1252c0d2f8c6dfa85ce370bc2364e1d634b573107f5da7b3d087bff1", kill_on_drop: false }`
[INFO] [stdout] e1b8da4f1252c0d2f8c6dfa85ce370bc2364e1d634b573107f5da7b3d087bff1