[INFO] fetching crate smt2 0.2.0...
[INFO] documenting smt2-0.2.0 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate smt2 0.2.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate smt2 0.2.0 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] started tweaking crates.io crate smt2 0.2.0
[INFO] finished tweaking crates.io crate smt2 0.2.0
[INFO] tweaked toml for crates.io crate smt2 0.2.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded utf8-decode v1.0.1
[INFO] [stderr]   Downloaded source-span v2.7.0
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 240bdc089e6d58821713d7faa4eb85b4adde8ebdaf3384c1043db1df0f172098
[INFO] running `Command { std: "docker" "start" "-a" "240bdc089e6d58821713d7faa4eb85b4adde8ebdaf3384c1043db1df0f172098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "240bdc089e6d58821713d7faa4eb85b4adde8ebdaf3384c1043db1df0f172098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "240bdc089e6d58821713d7faa4eb85b4adde8ebdaf3384c1043db1df0f172098", kill_on_drop: false }`
[INFO] [stdout] 240bdc089e6d58821713d7faa4eb85b4adde8ebdaf3384c1043db1df0f172098
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/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] c9ff2ffe669a01324e94f52a3c7472b366f90fa7f596b4b2e9b9989db924329b
[INFO] running `Command { std: "docker" "start" "-a" "c9ff2ffe669a01324e94f52a3c7472b366f90fa7f596b4b2e9b9989db924329b", kill_on_drop: false }`
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking utf8-decode v1.0.1
[INFO] [stderr]     Checking termion v1.5.6
[INFO] [stderr]     Checking source-span v2.7.0
[INFO] [stderr]  Documenting smt2 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(trait_alias)]
[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 `smt2`
[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 smt2 src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=29591376d2ca7821 -L dependency=/opt/rustwide/target/debug/deps --extern source_span=/opt/rustwide/target/debug/deps/libsource_span-a89678260db71ed2.rmeta --extern utf8_decode=/opt/rustwide/target/debug/deps/libutf8_decode-4e381c23ecda006e.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "c9ff2ffe669a01324e94f52a3c7472b366f90fa7f596b4b2e9b9989db924329b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9ff2ffe669a01324e94f52a3c7472b366f90fa7f596b4b2e9b9989db924329b", kill_on_drop: false }`
[INFO] [stdout] c9ff2ffe669a01324e94f52a3c7472b366f90fa7f596b4b2e9b9989db924329b
