[INFO] fetching crate nanobox 0.1.0...
[INFO] testing nanobox-0.1.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate nanobox 0.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate nanobox 0.1.0
[INFO] finished tweaking crates.io crate nanobox 0.1.0
[INFO] tweaked toml for crates.io crate nanobox 0.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate nanobox 0.1.0 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "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" "+1.91.0" "generate-lockfile" "--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]      Locking 62 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.5.1 (available: v0.7.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dda5b86a2c2c0cd0fb93c0f1c05b54350e45bdcb07611615a2e8f2e0aa76538a
[INFO] running `Command { std: "docker" "start" "-a" "dda5b86a2c2c0cd0fb93c0f1c05b54350e45bdcb07611615a2e8f2e0aa76538a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dda5b86a2c2c0cd0fb93c0f1c05b54350e45bdcb07611615a2e8f2e0aa76538a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dda5b86a2c2c0cd0fb93c0f1c05b54350e45bdcb07611615a2e8f2e0aa76538a", kill_on_drop: false }`
[INFO] [stdout] dda5b86a2c2c0cd0fb93c0f1c05b54350e45bdcb07611615a2e8f2e0aa76538a
[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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0ff179ad4914dcaaa488648ff7ed012b3773a7229fa2b0b0a721b3d748e78b1c
[INFO] running `Command { std: "docker" "start" "-a" "0ff179ad4914dcaaa488648ff7ed012b3773a7229fa2b0b0a721b3d748e78b1c", kill_on_drop: false }`
[INFO] [stderr]    Compiling nanobox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(unsize, coerce_unsized)]
[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 `nanobox` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "0ff179ad4914dcaaa488648ff7ed012b3773a7229fa2b0b0a721b3d748e78b1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ff179ad4914dcaaa488648ff7ed012b3773a7229fa2b0b0a721b3d748e78b1c", kill_on_drop: false }`
[INFO] [stdout] 0ff179ad4914dcaaa488648ff7ed012b3773a7229fa2b0b0a721b3d748e78b1c
