[INFO] fetching crate galvanic-mock 0.1.3...
[INFO] documenting galvanic-mock-0.1.3 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate galvanic-mock 0.1.3 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate galvanic-mock 0.1.3 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate galvanic-mock 0.1.3
[INFO] finished tweaking crates.io crate galvanic-mock 0.1.3
[INFO] tweaked toml for crates.io crate galvanic-mock 0.1.3 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "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" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded galvanic-assert v0.8.7
[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" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 16203813dab8d71d70ab1d3fe0c8ff75b20f40328c9f1ac7c576d7b78984e9f9
[INFO] running `Command { std: "docker" "start" "-a" "16203813dab8d71d70ab1d3fe0c8ff75b20f40328c9f1ac7c576d7b78984e9f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "16203813dab8d71d70ab1d3fe0c8ff75b20f40328c9f1ac7c576d7b78984e9f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16203813dab8d71d70ab1d3fe0c8ff75b20f40328c9f1ac7c576d7b78984e9f9", kill_on_drop: false }`
[INFO] [stdout] 16203813dab8d71d70ab1d3fe0c8ff75b20f40328c9f1ac7c576d7b78984e9f9
[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" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69aaa7e30bbcc224428359f838ddd452e00de97084bfa8e10096d6da46c62986
[INFO] running `Command { std: "docker" "start" "-a" "69aaa7e30bbcc224428359f838ddd452e00de97084bfa8e10096d6da46c62986", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-xid v0.0.4
[INFO] [stderr]     Checking quote v0.3.15
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]     Checking synom v0.11.3
[INFO] [stderr]     Checking syn v0.11.11
[INFO] [stderr]  Documenting galvanic-mock v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(proc_macro)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `proc_macro` has been stable since `1.29.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `galvanic-mock`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.76.0-x86_64-unknown-linux-gnu/bin/rustdoc --crate-type proc-macro --crate-name galvanic_mock src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=e1c502e8326616c3 -L dependency=/opt/rustwide/target/debug/deps --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-717c7f0a215ff09f.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-f5f6af3d7977df83.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-7cf1e9ecd77ab06c.rmeta --extern synom=/opt/rustwide/target/debug/deps/libsynom-4580a4ea90790973.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.3` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "69aaa7e30bbcc224428359f838ddd452e00de97084bfa8e10096d6da46c62986", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69aaa7e30bbcc224428359f838ddd452e00de97084bfa8e10096d6da46c62986", kill_on_drop: false }`
[INFO] [stdout] 69aaa7e30bbcc224428359f838ddd452e00de97084bfa8e10096d6da46c62986
