[INFO] fetching crate holodeque 0.2.0...
[INFO] checking holodeque-0.2.0 against 1.95.0 for pr-155915
[INFO] extracting crate holodeque 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate holodeque 0.2.0
[INFO] finished tweaking crates.io crate holodeque 0.2.0
[INFO] tweaked toml for crates.io crate holodeque 0.2.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate holodeque 0.2.0 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 87 packages to latest compatible versions
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] ea722ada5cc3dcf7e3528d60811e84f7203dc4ce6ff25ab26338d845d085a7f2
[INFO] running `Command { std: "docker" "start" "-a" "ea722ada5cc3dcf7e3528d60811e84f7203dc4ce6ff25ab26338d845d085a7f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ea722ada5cc3dcf7e3528d60811e84f7203dc4ce6ff25ab26338d845d085a7f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea722ada5cc3dcf7e3528d60811e84f7203dc4ce6ff25ab26338d845d085a7f2", kill_on_drop: false }`
[INFO] [stdout] ea722ada5cc3dcf7e3528d60811e84f7203dc4ce6ff25ab26338d845d085a7f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] ccb3676ce4c67b484e36d004607bda8862de1cea8e512185085924cb17178d01
[INFO] running `Command { std: "docker" "start" "-a" "ccb3676ce4c67b484e36d004607bda8862de1cea8e512185085924cb17178d01", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling libc v0.2.186
[INFO] [stderr]     Checking smallvec v1.15.1
[INFO] [stderr]     Checking unicode-ident v1.0.24
[INFO] [stderr]    Compiling getrandom v0.4.2
[INFO] [stderr]     Checking percent-encoding v2.3.2
[INFO] [stderr]     Checking winnow v0.5.40
[INFO] [stderr]    Compiling pulldown-cmark v0.9.6
[INFO] [stderr]     Checking form_urlencoded v1.2.2
[INFO] [stderr]     Checking env_logger v0.11.10
[INFO] [stderr]     Checking semver v1.0.28
[INFO] [stderr]     Checking holodeque v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:87:1
[INFO] [stdout]    |
[INFO] [stdout] 87 | #![feature(array_map)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `array_map` has been stable since 1.55.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/lib.rs:87:12
[INFO] [stdout]    |
[INFO] [stdout] 87 | #![feature(array_map)]
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `holodeque` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ccb3676ce4c67b484e36d004607bda8862de1cea8e512185085924cb17178d01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccb3676ce4c67b484e36d004607bda8862de1cea8e512185085924cb17178d01", kill_on_drop: false }`
[INFO] [stdout] ccb3676ce4c67b484e36d004607bda8862de1cea8e512185085924cb17178d01
