[INFO] cloning repository https://github.com/mattj23/airfoil-inspection
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mattj23/airfoil-inspection" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmattj23%2Fairfoil-inspection", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmattj23%2Fairfoil-inspection'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 944272c6cbfceac26c5369a14970f4945e88699e
[INFO] documenting mattj23/airfoil-inspection against master#ef324565d071c6d7e2477a195648549e33d6a465 for pr-121659-bump-pulldown-cmark
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmattj23%2Fairfoil-inspection" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mattj23/airfoil-inspection on toolchain ef324565d071c6d7e2477a195648549e33d6a465
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ef324565d071c6d7e2477a195648549e33d6a465" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mattj23/airfoil-inspection
[INFO] finished tweaking git repo https://github.com/mattj23/airfoil-inspection
[INFO] tweaked toml for git repo https://github.com/mattj23/airfoil-inspection written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mattj23/airfoil-inspection already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ef324565d071c6d7e2477a195648549e33d6a465" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] documenting mattj23/airfoil-inspection against try#223112bf1ca31911a6475910c77b36bfa127d5f8 for pr-121659-bump-pulldown-cmark
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmattj23%2Fairfoil-inspection" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mattj23/airfoil-inspection on toolchain 223112bf1ca31911a6475910c77b36bfa127d5f8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+223112bf1ca31911a6475910c77b36bfa127d5f8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mattj23/airfoil-inspection
[INFO] finished tweaking git repo https://github.com/mattj23/airfoil-inspection
[INFO] tweaked toml for git repo https://github.com/mattj23/airfoil-inspection written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/mattj23/airfoil-inspection already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+223112bf1ca31911a6475910c77b36bfa127d5f8" "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 wide v0.7.6
[INFO] [stderr]   Downloaded ncollide2d v0.33.0
[INFO] [stderr]   Downloaded nalgebra v0.32.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+223112bf1ca31911a6475910c77b36bfa127d5f8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7b42926660e66d02363309bd3b02688c16c1ac37ada025ef5a5143f34ee65f58
[INFO] running `Command { std: "docker" "start" "-a" "7b42926660e66d02363309bd3b02688c16c1ac37ada025ef5a5143f34ee65f58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b42926660e66d02363309bd3b02688c16c1ac37ada025ef5a5143f34ee65f58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b42926660e66d02363309bd3b02688c16c1ac37ada025ef5a5143f34ee65f58", kill_on_drop: false }`
[INFO] [stdout] 7b42926660e66d02363309bd3b02688c16c1ac37ada025ef5a5143f34ee65f58
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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" "+223112bf1ca31911a6475910c77b36bfa127d5f8" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6eadb5fd5c054fea8d28e95124ae76f0fade2706af347609326dfa6ae7206f1f
[INFO] running `Command { std: "docker" "start" "-a" "6eadb5fd5c054fea8d28e95124ae76f0fade2706af347609326dfa6ae7206f1f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking bytemuck v1.13.0
[INFO] [stderr]    Compiling paste v1.0.11
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]    Compiling slotmap v1.0.6
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling serde_json v1.0.93
[INFO] [stderr]     Checking indexmap v1.9.2
[INFO] [stderr]     Checking fixedbitset v0.4.2
[INFO] [stderr]     Checking slab v0.4.7
[INFO] [stderr]     Checking downcast-rs v1.2.0
[INFO] [stderr]     Checking ryu v1.0.12
[INFO] [stderr]     Checking either v1.8.1
[INFO] [stderr]     Checking matrixmultiply v0.3.2
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.51/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking safe_arch v0.6.0
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "6eadb5fd5c054fea8d28e95124ae76f0fade2706af347609326dfa6ae7206f1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6eadb5fd5c054fea8d28e95124ae76f0fade2706af347609326dfa6ae7206f1f", kill_on_drop: false }`
[INFO] [stdout] 6eadb5fd5c054fea8d28e95124ae76f0fade2706af347609326dfa6ae7206f1f