[INFO] fetching crate under 0.2.0...
[INFO] testing under-0.2.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate under 0.2.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate under 0.2.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate under 0.2.0
[INFO] finished tweaking crates.io crate under 0.2.0
[INFO] tweaked toml for crates.io crate under 0.2.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tower-layer v0.3.1
[INFO] [stderr]   Downloaded async-sse v5.1.0
[INFO] [stderr]   Downloaded tower v0.4.12
[INFO] [stderr]   Downloaded tower-http v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e706a9749d80b18723ae2640fd65b1ab47b08c8893d7c3d8a7884cd73139cf7b
[INFO] running `Command { std: "docker" "start" "-a" "e706a9749d80b18723ae2640fd65b1ab47b08c8893d7c3d8a7884cd73139cf7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e706a9749d80b18723ae2640fd65b1ab47b08c8893d7c3d8a7884cd73139cf7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e706a9749d80b18723ae2640fd65b1ab47b08c8893d7c3d8a7884cd73139cf7b", kill_on_drop: false }`
[INFO] [stdout] e706a9749d80b18723ae2640fd65b1ab47b08c8893d7c3d8a7884cd73139cf7b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e267dc446133fff22bf64c4a771ccefcae7a355cf24c501088d4dac9b6240f43
[INFO] running `Command { std: "docker" "start" "-a" "e267dc446133fff22bf64c4a771ccefcae7a355cf24c501088d4dac9b6240f43", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling anyhow v1.0.56
[INFO] [stderr]    Compiling http-types v2.12.0
[INFO] [stderr]    Compiling async-trait v0.1.53
[INFO] [stderr]    Compiling time-macros v0.2.4
[INFO] [stderr]    Compiling infer v0.2.3
[INFO] [stderr]    Compiling tower-layer v0.3.1
[INFO] [stderr]    Compiling num_threads v0.1.5
[INFO] [stderr]    Compiling tracing-core v0.1.25
[INFO] [stderr]    Compiling indexmap v1.8.1
[INFO] [stderr]    Compiling cookie v0.16.0
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling tokio v1.17.0
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling time v0.3.9
[INFO] [stderr]    Compiling tokio-util v0.6.9
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling tracing-attributes v0.1.20
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling pin-project-internal v1.0.10
[INFO] [stderr]    Compiling tracing v0.1.33
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling pin-project v1.0.10
[INFO] [stderr]    Compiling tokio-util v0.7.1
[INFO] [stderr]    Compiling tower v0.4.12
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling h2 v0.3.13
[INFO] [stderr]    Compiling futures v0.3.21
[INFO] [stderr]    Compiling tower-http v0.1.3
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling url v2.2.2
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling serde_qs v0.8.5
[INFO] [stderr]    Compiling hyper v0.14.18
[INFO] [stderr]    Compiling async-sse v5.1.0
[INFO] [stderr]    Compiling under 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:30:1
[INFO] [stdout]    |
[INFO] [stdout] 30 | #![feature(doc_cfg)]
[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 `under` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "e267dc446133fff22bf64c4a771ccefcae7a355cf24c501088d4dac9b6240f43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e267dc446133fff22bf64c4a771ccefcae7a355cf24c501088d4dac9b6240f43", kill_on_drop: false }`
[INFO] [stdout] e267dc446133fff22bf64c4a771ccefcae7a355cf24c501088d4dac9b6240f43