[INFO] cloning repository https://github.com/WorldSEnder/rust-specialization-blog
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/WorldSEnder/rust-specialization-blog" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWorldSEnder%2Frust-specialization-blog", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWorldSEnder%2Frust-specialization-blog'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a8b5c1516a62d2f2c24c84d8d01318ca5025d95d
[INFO] documenting WorldSEnder/rust-specialization-blog against 1.75.0 for beta-1.76-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWorldSEnder%2Frust-specialization-blog" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/WorldSEnder/rust-specialization-blog on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-3-tc1/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/WorldSEnder/rust-specialization-blog
[INFO] finished tweaking git repo https://github.com/WorldSEnder/rust-specialization-blog
[INFO] tweaked toml for git repo https://github.com/WorldSEnder/rust-specialization-blog written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/WorldSEnder/rust-specialization-blog already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c9dd2809df2c7f99ea785b658175f5a05485d6fbf3c661c3ed14e000b5a192c2
[INFO] running `Command { std: "docker" "start" "-a" "c9dd2809df2c7f99ea785b658175f5a05485d6fbf3c661c3ed14e000b5a192c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c9dd2809df2c7f99ea785b658175f5a05485d6fbf3c661c3ed14e000b5a192c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9dd2809df2c7f99ea785b658175f5a05485d6fbf3c661c3ed14e000b5a192c2", kill_on_drop: false }`
[INFO] [stdout] c9dd2809df2c7f99ea785b658175f5a05485d6fbf3c661c3ed14e000b5a192c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d5101c3485e09c711d2dac51e408988146f3f5c106f37e89c6e6c0314e46dee4
[INFO] running `Command { std: "docker" "start" "-a" "d5101c3485e09c711d2dac51e408988146f3f5c106f37e89c6e6c0314e46dee4", kill_on_drop: false }`
[INFO] [stderr]     Checking trait_host v0.1.0 (/opt/rustwide/workdir/trait-host)
[INFO] [stderr]     Checking trait_impl v0.1.0 (/opt/rustwide/workdir/trait-impl)
[INFO] [stderr]  Documenting trait_host v0.1.0 (/opt/rustwide/workdir/trait-host)
[INFO] [stderr]  Documenting trait_impl v0.1.0 (/opt/rustwide/workdir/trait-impl)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> trait-host/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(min_specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> trait-host/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(min_specialization)]
[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] [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 `trait_host`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type lib --crate-name trait_host trait-host/src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=1aab9c033899eeac -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `trait_host` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "d5101c3485e09c711d2dac51e408988146f3f5c106f37e89c6e6c0314e46dee4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5101c3485e09c711d2dac51e408988146f3f5c106f37e89c6e6c0314e46dee4", kill_on_drop: false }`
[INFO] [stdout] d5101c3485e09c711d2dac51e408988146f3f5c106f37e89c6e6c0314e46dee4
