[INFO] fetching crate ringboard 0.16.0...
[INFO] checking ringboard-0.16.0 against 1.95.0 for pr-155915
[INFO] extracting crate ringboard 0.16.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate ringboard 0.16.0
[INFO] finished tweaking crates.io crate ringboard 0.16.0
[INFO] tweaked toml for crates.io crate ringboard 0.16.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ringboard 0.16.0 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate ringboard 0.16.0 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded normpath v1.5.0
[INFO] [stderr]   Downloaded base64-serde v0.8.0
[INFO] [stderr]   Downloaded clap-num v1.2.0
[INFO] [stderr]   Downloaded rand_xoshiro v0.8.0
[INFO] [stderr]   Downloaded ask-cli v0.3.1
[INFO] [stderr]   Downloaded supercilex-tests v0.4.21
[INFO] [stderr]   Downloaded fuc_engine v3.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8b6dbf5fe4a1e8188d2cdad56649ff7c8308c573a926f2de15704b3b10f24978
[INFO] running `Command { std: "docker" "start" "-a" "8b6dbf5fe4a1e8188d2cdad56649ff7c8308c573a926f2de15704b3b10f24978", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b6dbf5fe4a1e8188d2cdad56649ff7c8308c573a926f2de15704b3b10f24978", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b6dbf5fe4a1e8188d2cdad56649ff7c8308c573a926f2de15704b3b10f24978", kill_on_drop: false }`
[INFO] [stdout] 8b6dbf5fe4a1e8188d2cdad56649ff7c8308c573a926f2de15704b3b10f24978
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5d3b5f9cdb1acf55c22acc77ab7750a3e749535531fcb65b48eb2246066ce380
[INFO] running `Command { std: "docker" "start" "-a" "5d3b5f9cdb1acf55c22acc77ab7750a3e749535531fcb65b48eb2246066ce380", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling rustix v1.1.4
[INFO] [stderr]     Checking linux-raw-sys v0.12.1
[INFO] [stderr]    Compiling error-stack v0.7.0
[INFO] [stderr]    Compiling unicase v2.9.0
[INFO] [stderr]     Checking toml_parser v1.1.2+spec-1.1.0
[INFO] [stderr]     Checking toml_datetime v1.1.1+spec-1.1.0
[INFO] [stderr]     Checking serde_spanned v1.1.1
[INFO] [stderr]    Compiling mime_guess v2.0.5
[INFO] [stderr]     Checking toml_writer v1.1.1+spec-1.1.0
[INFO] [stderr]     Checking rand v0.10.1
[INFO] [stderr]     Checking smallvec v2.0.0-alpha.12
[INFO] [stderr]     Checking toml v1.1.2+spec-1.1.0
[INFO] [stderr]     Checking expect-test v1.5.1
[INFO] [stderr]     Checking clap-num v1.2.0
[INFO] [stderr]     Checking rand_xoshiro v0.8.0
[INFO] [stderr]     Checking ask-cli v0.3.1
[INFO] [stderr]     Checking base64-serde v0.8.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/ask-cli-0.3.1/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(read_buf)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ask-cli` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "5d3b5f9cdb1acf55c22acc77ab7750a3e749535531fcb65b48eb2246066ce380", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d3b5f9cdb1acf55c22acc77ab7750a3e749535531fcb65b48eb2246066ce380", kill_on_drop: false }`
[INFO] [stdout] 5d3b5f9cdb1acf55c22acc77ab7750a3e749535531fcb65b48eb2246066ce380