[INFO] fetching crate derive-collect-docs 0.1.0...
[INFO] checking derive-collect-docs-0.1.0 against master#7b3a7819371cef92a187e9bac8f7810ccde15216 for pr-74846
[INFO] extracting crate derive-collect-docs 0.1.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate derive-collect-docs 0.1.0 on toolchain 7b3a7819371cef92a187e9bac8f7810ccde15216
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate derive-collect-docs 0.1.0
[INFO] finished tweaking crates.io crate derive-collect-docs 0.1.0
[INFO] tweaked toml for crates.io crate derive-collect-docs 0.1.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate derive-collect-docs 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "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] 9e984559c09f31fd5c4f9a2494c4b4446827e05a1802a192da813065f07f5d9f
[INFO] running `Command { std: "docker" "start" "-a" "9e984559c09f31fd5c4f9a2494c4b4446827e05a1802a192da813065f07f5d9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e984559c09f31fd5c4f9a2494c4b4446827e05a1802a192da813065f07f5d9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e984559c09f31fd5c4f9a2494c4b4446827e05a1802a192da813065f07f5d9f", kill_on_drop: false }`
[INFO] [stdout] 9e984559c09f31fd5c4f9a2494c4b4446827e05a1802a192da813065f07f5d9f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2dbac41ae8861073515ae00fcd10d47a88934e46333e814601c3dd0bbb591844
[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" "2dbac41ae8861073515ae00fcd10d47a88934e46333e814601c3dd0bbb591844", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking linked-hash-map v0.5.2
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking unindent v0.1.5
[INFO] [stderr]     Checking once_cell v1.3.1
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking yaml-rust v0.4.3
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]     Checking quote v1.0.3
[INFO] [stderr]     Checking syn v1.0.17
[INFO] [stderr]     Checking regex v1.3.6
[INFO] [stderr]     Checking derive-collect-docs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling serde_derive v1.0.105
[INFO] [stderr]     Checking serde v1.0.105
[INFO] [stderr]     Checking serde_yaml v0.8.11
[INFO] [stdout] error: proc-macro derive panicked
[INFO] [stdout]   --> examples/foo.rs:13:37
[INFO] [stdout]    |
[INFO] [stdout] 13 | #[derive(Debug, serde::Deserialize, CollectDocs)]
[INFO] [stdout]    |                                     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: message: could not create directory ./docs/generated: Os { code: 30, kind: Other, message: "Read-only file system" }
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `derive-collect-docs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "2dbac41ae8861073515ae00fcd10d47a88934e46333e814601c3dd0bbb591844", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2dbac41ae8861073515ae00fcd10d47a88934e46333e814601c3dd0bbb591844", kill_on_drop: false }`
[INFO] [stdout] 2dbac41ae8861073515ae00fcd10d47a88934e46333e814601c3dd0bbb591844