[INFO] fetching crate sth 0.1.1...
[INFO] documenting sth-0.1.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate sth 0.1.1 into /workspace/builds/worker-39/source
[INFO] validating manifest of crates.io crate sth 0.1.1 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate sth 0.1.1
[INFO] finished tweaking crates.io crate sth 0.1.1
[INFO] tweaked toml for crates.io crate sth 0.1.1 written to /workspace/builds/worker-39/source/Cargo.toml
[INFO] crate crates.io crate sth 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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 is-macro v0.2.0
[INFO] [stderr]   Downloaded nothing v0.1.11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1e464754befeca1295a72192f75a536dbff4874d5ad453970466ce0dcc7fb311
[INFO] running `Command { std: "docker" "start" "-a" "1e464754befeca1295a72192f75a536dbff4874d5ad453970466ce0dcc7fb311", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e464754befeca1295a72192f75a536dbff4874d5ad453970466ce0dcc7fb311", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e464754befeca1295a72192f75a536dbff4874d5ad453970466ce0dcc7fb311", kill_on_drop: false }`
[INFO] [stdout] 1e464754befeca1295a72192f75a536dbff4874d5ad453970466ce0dcc7fb311
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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" "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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3afeee2513b2b94ff21203681e64e2599894cab33b29e8b2087194f833219213
[INFO] running `Command { std: "docker" "start" "-a" "3afeee2513b2b94ff21203681e64e2599894cab33b29e8b2087194f833219213", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.37
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling pmutil v0.5.3
[INFO] [stderr]    Compiling is-macro v0.2.0
[INFO] [stderr]     Checking nothing v0.1.11
[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/nothing-0.1.11/lib.rs:42:1
[INFO] [stdout]    |
[INFO] [stdout] 42 | #![feature(derive_default_enum)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/nothing-0.1.11/lib.rs:43:1
[INFO] [stdout]    |
[INFO] [stdout] 43 | #![feature(try_trait_v2)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/nothing-0.1.11/lib.rs:43:12
[INFO] [stdout]    |
[INFO] [stdout] 43 | #![feature(try_trait_v2)]
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nothing` due to 4 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3afeee2513b2b94ff21203681e64e2599894cab33b29e8b2087194f833219213", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3afeee2513b2b94ff21203681e64e2599894cab33b29e8b2087194f833219213", kill_on_drop: false }`
[INFO] [stdout] 3afeee2513b2b94ff21203681e64e2599894cab33b29e8b2087194f833219213