[INFO] fetching crate cmd_lib_macros 0.1.0...
[INFO] documenting cmd_lib_macros-0.1.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate cmd_lib_macros 0.1.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate cmd_lib_macros 0.1.0 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 cmd_lib_macros 0.1.0
[INFO] finished tweaking crates.io crate cmd_lib_macros 0.1.0
[INFO] tweaked toml for crates.io crate cmd_lib_macros 0.1.0 written to /workspace/builds/worker-12/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 996f5c7fa1b120992794a966c962c1c44b95e0c69bc62258651bf45bd9435ff8
[INFO] running `Command { std: "docker" "start" "-a" "996f5c7fa1b120992794a966c962c1c44b95e0c69bc62258651bf45bd9435ff8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "996f5c7fa1b120992794a966c962c1c44b95e0c69bc62258651bf45bd9435ff8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "996f5c7fa1b120992794a966c962c1c44b95e0c69bc62258651bf45bd9435ff8", kill_on_drop: false }`
[INFO] [stdout] 996f5c7fa1b120992794a966c962c1c44b95e0c69bc62258651bf45bd9435ff8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 1bdd821125e430bab3444339a55b225c453dd8d36876c4c6db50d3f0c71dd9db
[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" "1bdd821125e430bab3444339a55b225c453dd8d36876c4c6db50d3f0c71dd9db", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]     Checking cmd_lib_core v0.1.0
[INFO] [stderr]     Checking quote v1.0.7
[INFO] [stderr]  Documenting cmd_lib_macros 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_span)]
[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 `cmd_lib_macros`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name cmd_lib_macros 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 cmd_lib_core=/opt/rustwide/target/debug/deps/libcmd_lib_core-85e09e6ac21f664f.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-0a3adf75784854f5.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-69b775f743911a8b.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "1bdd821125e430bab3444339a55b225c453dd8d36876c4c6db50d3f0c71dd9db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bdd821125e430bab3444339a55b225c453dd8d36876c4c6db50d3f0c71dd9db", kill_on_drop: false }`
[INFO] [stdout] 1bdd821125e430bab3444339a55b225c453dd8d36876c4c6db50d3f0c71dd9db
