[INFO] fetching crate serde_cef 0.1.0...
[INFO] documenting serde_cef-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate serde_cef 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate serde_cef 0.1.0 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serde_cef 0.1.0
[INFO] finished tweaking crates.io crate serde_cef 0.1.0
[INFO] tweaked toml for crates.io crate serde_cef 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b0abab76821047d2e7e29cf13603a90e181a404f8e64ecb53d9d2bb70c65a67b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b0abab76821047d2e7e29cf13603a90e181a404f8e64ecb53d9d2bb70c65a67b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b0abab76821047d2e7e29cf13603a90e181a404f8e64ecb53d9d2bb70c65a67b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0abab76821047d2e7e29cf13603a90e181a404f8e64ecb53d9d2bb70c65a67b", kill_on_drop: false }`
[INFO] [stdout] b0abab76821047d2e7e29cf13603a90e181a404f8e64ecb53d9d2bb70c65a67b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e7de37dce0d7ee4689af5409abc86123cfa3e62bcda7b4cf8a6147d634aa61d0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e7de37dce0d7ee4689af5409abc86123cfa3e62bcda7b4cf8a6147d634aa61d0", kill_on_drop: false }`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]     Checking ordered-float v1.1.0
[INFO] [stderr]     Checking num-integer v0.1.43
[INFO] [stderr]     Checking serde-value v0.6.0
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking serde-value-flatten v0.1.0
[INFO] [stderr]  Documenting serde_cef v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:93:1
[INFO] [stdout]    |
[INFO] [stdout] 93 | #![feature(try_trait)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[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 `serde_cef`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name serde_cef 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 chrono=/opt/rustwide/target/debug/deps/libchrono-da5bd00722192949.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-5103ea9f59ed634c.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5429dd6d097468fb.rmeta --extern serde_value=/opt/rustwide/target/debug/deps/libserde_value-5e5f8e44770512d2.rmeta --extern serde_value_flatten=/opt/rustwide/target/debug/deps/libserde_value_flatten-d24897ddca11f1ff.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-9657277a275bd2e8.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-dbda8714378e19d3.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e7de37dce0d7ee4689af5409abc86123cfa3e62bcda7b4cf8a6147d634aa61d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7de37dce0d7ee4689af5409abc86123cfa3e62bcda7b4cf8a6147d634aa61d0", kill_on_drop: false }`
[INFO] [stdout] e7de37dce0d7ee4689af5409abc86123cfa3e62bcda7b4cf8a6147d634aa61d0