[INFO] fetching crate exif 0.0.1...
[INFO] documenting exif-0.0.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate exif 0.0.1 into /workspace/builds/worker-67/source
[INFO] validating manifest of crates.io crate exif 0.0.1 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exif 0.0.1
[INFO] finished tweaking crates.io crate exif 0.0.1
[INFO] tweaked toml for crates.io crate exif 0.0.1 written to /workspace/builds/worker-67/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded exif-sys v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 96d6377e71f6caab80488b3fc8e05e97f9290e1d4fa43d83bba7c2fb4b403af8
[INFO] running `Command { std: "docker" "start" "-a" "96d6377e71f6caab80488b3fc8e05e97f9290e1d4fa43d83bba7c2fb4b403af8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "96d6377e71f6caab80488b3fc8e05e97f9290e1d4fa43d83bba7c2fb4b403af8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96d6377e71f6caab80488b3fc8e05e97f9290e1d4fa43d83bba7c2fb4b403af8", kill_on_drop: false }`
[INFO] [stdout] 96d6377e71f6caab80488b3fc8e05e97f9290e1d4fa43d83bba7c2fb4b403af8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eca2cb0e4177e6388d4da05fd0cf17eb1b25b8b40e6452a8f1b0b29181f7ed44
[INFO] running `Command { std: "docker" "start" "-a" "eca2cb0e4177e6388d4da05fd0cf17eb1b25b8b40e6452a8f1b0b29181f7ed44", kill_on_drop: false }`
[INFO] [stderr]    Compiling exif-sys v0.1.0
[INFO] [stderr]  Documenting exif v0.0.1 (/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(pub_restricted,conservative_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `pub_restricted` has been stable since 1.18.0 and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `exif`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name exif src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern exif_sys=/opt/rustwide/target/debug/deps/libexif_sys-f83ff5e9b68245a0.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-d38c567ce4ccc50e.rmeta --cap-lints=warn --crate-version 0.0.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "eca2cb0e4177e6388d4da05fd0cf17eb1b25b8b40e6452a8f1b0b29181f7ed44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eca2cb0e4177e6388d4da05fd0cf17eb1b25b8b40e6452a8f1b0b29181f7ed44", kill_on_drop: false }`
[INFO] [stdout] eca2cb0e4177e6388d4da05fd0cf17eb1b25b8b40e6452a8f1b0b29181f7ed44
