[INFO] fetching crate intercom-utils 0.2.0...
[INFO] documenting intercom-utils-0.2.0 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate intercom-utils 0.2.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate intercom-utils 0.2.0 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 intercom-utils 0.2.0
[INFO] finished tweaking crates.io crate intercom-utils 0.2.0
[INFO] tweaked toml for crates.io crate intercom-utils 0.2.0 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 if_chain v0.1.3
[INFO] [stderr]   Downloaded sha1 v0.3.0
[INFO] [stderr]   Downloaded intercom-common v0.2.0
[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] 005518cafe90338edab936959d3e13b3b568831a572260b73db1bd55a33002b2
[INFO] running `Command { std: "docker" "start" "-a" "005518cafe90338edab936959d3e13b3b568831a572260b73db1bd55a33002b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "005518cafe90338edab936959d3e13b3b568831a572260b73db1bd55a33002b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "005518cafe90338edab936959d3e13b3b568831a572260b73db1bd55a33002b2", kill_on_drop: false }`
[INFO] [stdout] 005518cafe90338edab936959d3e13b3b568831a572260b73db1bd55a33002b2
[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] 8d5b9db202dbd04eca6730e26179852d6edf2a9531551296767641b54a7c7f0b
[INFO] running `Command { std: "docker" "start" "-a" "8d5b9db202dbd04eca6730e26179852d6edf2a9531551296767641b54a7c7f0b", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-xid v0.0.4
[INFO] [stderr]     Checking quote v0.3.15
[INFO] [stderr]     Checking sha1 v0.3.0
[INFO] [stderr]     Checking if_chain v0.1.3
[INFO] [stderr]     Checking glob v0.2.11
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking synom v0.11.3
[INFO] [stderr]     Checking syn v0.11.11
[INFO] [stderr]     Checking intercom-common v0.2.0
[INFO] [stderr]  Documenting intercom-utils v0.2.0 (/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(try_trait)]
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `try_trait`
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `intercom-utils`
[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 bin --crate-name intercom_utils src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=fd0e6ab10c4c2244 -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-a064f8bde056cbbe.rmeta --extern glob=/opt/rustwide/target/debug/deps/libglob-8227003c7e4761ce.rmeta --extern if_chain=/opt/rustwide/target/debug/deps/libif_chain-47aca2bd6aeba78e.rmeta --extern intercom_common=/opt/rustwide/target/debug/deps/libintercom_common-2c4f560823a77f91.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-c2e5214e08d8f4bc.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-82f2e21b1269ecb7.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8d5b9db202dbd04eca6730e26179852d6edf2a9531551296767641b54a7c7f0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d5b9db202dbd04eca6730e26179852d6edf2a9531551296767641b54a7c7f0b", kill_on_drop: false }`
[INFO] [stdout] 8d5b9db202dbd04eca6730e26179852d6edf2a9531551296767641b54a7c7f0b
