[INFO] fetching crate testing 0.10.1...
[INFO] documenting testing-0.10.1 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate testing 0.10.1 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate testing 0.10.1 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate testing 0.10.1
[INFO] finished tweaking crates.io crate testing 0.10.1
[INFO] tweaked toml for crates.io crate testing 0.10.1 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "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" "+1.47.0" "fetch" "--locked" "--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 swc_common v0.10.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24521ca2c00fb41716eac8c2cc89e9d4f8537c5a271ec2c65c728ff4a205e751
[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" "24521ca2c00fb41716eac8c2cc89e9d4f8537c5a271ec2c65c728ff4a205e751", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24521ca2c00fb41716eac8c2cc89e9d4f8537c5a271ec2c65c728ff4a205e751", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24521ca2c00fb41716eac8c2cc89e9d4f8537c5a271ec2c65c728ff4a205e751", kill_on_drop: false }`
[INFO] [stdout] 24521ca2c00fb41716eac8c2cc89e9d4f8537c5a271ec2c65c728ff4a205e751
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7b7f61fc0e3194f1a59bed9de939a24cbcb6939c22547b8391020bf7b9eb7bcc
[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" "7b7f61fc0e3194f1a59bed9de939a24cbcb6939c22547b8391020bf7b9eb7bcc", kill_on_drop: false }`
[INFO] [stderr]     Checking pretty_assertions v0.6.1
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling swc_macros_common v0.3.1
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling swc_visit_macros v0.2.0
[INFO] [stderr]    Compiling from_variant v0.1.2
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling ast_node v0.7.0
[INFO] [stderr]     Checking swc_visit v0.2.0
[INFO] [stderr]     Checking swc_common v0.10.4
[INFO] [stderr]  Documenting testing v0.10.1 (/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(test)]
[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 `testing`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name testing 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 ansi_term=/opt/rustwide/target/debug/deps/libansi_term-8bc814c299238115.rmeta --extern difference=/opt/rustwide/target/debug/deps/libdifference-2bcbe6d9a2feb0df.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-28537720aa606532.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-48fbfd5d624c4cb9.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-d926fdf7c10f1bde.rmeta --extern pretty_assertions=/opt/rustwide/target/debug/deps/libpretty_assertions-58e88c01f0539468.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-f7893ea89c3244ad.rmeta --extern swc_common=/opt/rustwide/target/debug/deps/libswc_common-499d2e33267e7c72.rmeta --cap-lints=warn --crate-version 0.10.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "7b7f61fc0e3194f1a59bed9de939a24cbcb6939c22547b8391020bf7b9eb7bcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b7f61fc0e3194f1a59bed9de939a24cbcb6939c22547b8391020bf7b9eb7bcc", kill_on_drop: false }`
[INFO] [stdout] 7b7f61fc0e3194f1a59bed9de939a24cbcb6939c22547b8391020bf7b9eb7bcc
