[INFO] cloning repository https://github.com/ZangaiFamily/matching
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ZangaiFamily/matching" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FZangaiFamily%2Fmatching", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FZangaiFamily%2Fmatching'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3a29e668dd3a058a482cf0193b1156ea6f6c2787
[INFO] documenting ZangaiFamily/matching against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FZangaiFamily%2Fmatching" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ZangaiFamily/matching 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 git repo https://github.com/ZangaiFamily/matching
[INFO] finished tweaking git repo https://github.com/ZangaiFamily/matching
[INFO] tweaked toml for git repo https://github.com/ZangaiFamily/matching written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/ZangaiFamily/matching 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]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_json v1.0.26
[INFO] [stderr]   Downloaded ryu v0.2.5
[INFO] [stderr]   Downloaded rust_decimal v0.10.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9c96118aa478e639a2a395f6b22e73f8d6c09399b7e7136dee686268802151d3
[INFO] running `Command { std: "docker" "start" "-a" "9c96118aa478e639a2a395f6b22e73f8d6c09399b7e7136dee686268802151d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c96118aa478e639a2a395f6b22e73f8d6c09399b7e7136dee686268802151d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c96118aa478e639a2a395f6b22e73f8d6c09399b7e7136dee686268802151d3", kill_on_drop: false }`
[INFO] [stdout] 9c96118aa478e639a2a395f6b22e73f8d6c09399b7e7136dee686268802151d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bf4317cf06ab7d63dd6a08c123a51edfe43924216b0cabf1466583fe4c3fbd24
[INFO] running `Command { std: "docker" "start" "-a" "bf4317cf06ab7d63dd6a08c123a51edfe43924216b0cabf1466583fe4c3fbd24", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.5
[INFO] [stderr]    Compiling num-bigint v0.2.0
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num-complex v0.2.0
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling serde v1.0.71
[INFO] [stderr]    Compiling ryu v0.2.5
[INFO] [stderr]     Checking byteorder v1.2.4
[INFO] [stderr]     Checking itoa v0.4.2
[INFO] [stderr]     Checking num-integer v0.1.39
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking rust_decimal v0.10.1
[INFO] [stderr]     Checking serde_json v1.0.26
[INFO] [stderr]  Documenting matching v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 document `matching`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name matching src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=198f810efb408842 -L dependency=/opt/rustwide/target/debug/deps --extern rust_decimal=/opt/rustwide/target/debug/deps/librust_decimal-a41d1efb871c168a.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-7c64b7293200f2b1.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "bf4317cf06ab7d63dd6a08c123a51edfe43924216b0cabf1466583fe4c3fbd24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf4317cf06ab7d63dd6a08c123a51edfe43924216b0cabf1466583fe4c3fbd24", kill_on_drop: false }`
[INFO] [stdout] bf4317cf06ab7d63dd6a08c123a51edfe43924216b0cabf1466583fe4c3fbd24