[INFO] cloning repository https://github.com/Fallen4Eyes/sentences2svg
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Fallen4Eyes/sentences2svg" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFallen4Eyes%2Fsentences2svg", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFallen4Eyes%2Fsentences2svg'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 43eba870200a985651f18e6e4ab3fabde7574b31
[INFO] documenting Fallen4Eyes/sentences2svg against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFallen4Eyes%2Fsentences2svg" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Fallen4Eyes/sentences2svg on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Fallen4Eyes/sentences2svg
[INFO] finished tweaking git repo https://github.com/Fallen4Eyes/sentences2svg
[INFO] tweaked toml for git repo https://github.com/Fallen4Eyes/sentences2svg written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/Fallen4Eyes/sentences2svg already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded siphasher v0.3.7
[INFO] [stderr]   Downloaded xmlwriter v0.1.0
[INFO] [stderr]   Downloaded svgtypes v0.8.0
[INFO] [stderr]   Downloaded ttf-parser v0.13.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] d8c608074b742951b6b17b73fba53499f95250ad7d425956a7f1d27ddf105f9c
[INFO] running `Command { std: "docker" "start" "-a" "d8c608074b742951b6b17b73fba53499f95250ad7d425956a7f1d27ddf105f9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d8c608074b742951b6b17b73fba53499f95250ad7d425956a7f1d27ddf105f9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d8c608074b742951b6b17b73fba53499f95250ad7d425956a7f1d27ddf105f9c", kill_on_drop: false }`
[INFO] [stdout] d8c608074b742951b6b17b73fba53499f95250ad7d425956a7f1d27ddf105f9c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bcf332e4c1996127024ddc57d2c96f30640c344f3d9f26193f80189f853bfa2a
[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" "bcf332e4c1996127024ddc57d2c96f30640c344f3d9f26193f80189f853bfa2a", kill_on_drop: false }`
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking xmlwriter v0.1.0
[INFO] [stderr]     Checking pico-args v0.4.2
[INFO] [stderr]     Checking ttf-parser v0.13.4
[INFO] [stderr]    Compiling nom v7.1.0
[INFO] [stderr]     Checking svgtypes v0.8.0
[INFO] [stderr]     Checking libc v0.2.112
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]  Documenting sentences2svg v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(path_try_exists)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `sentences2svg`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name sentences2svg src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=1abaf790c8d25cb2 -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-6acff3152a12ecf8.rmeta --extern base64=/opt/rustwide/target/debug/deps/libbase64-8bcb81a96746c276.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-bcc4b0414de46f2b.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-9187a01774246dd5.rmeta --extern pico_args=/opt/rustwide/target/debug/deps/libpico_args-35e635e9e47d257d.rmeta --extern svgtypes=/opt/rustwide/target/debug/deps/libsvgtypes-8eb44c568395433e.rmeta --extern ttf_parser=/opt/rustwide/target/debug/deps/libttf_parser-41a43290d6e5ca98.rmeta --extern xmlwriter=/opt/rustwide/target/debug/deps/libxmlwriter-0429d8a70307eeea.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "bcf332e4c1996127024ddc57d2c96f30640c344f3d9f26193f80189f853bfa2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bcf332e4c1996127024ddc57d2c96f30640c344f3d9f26193f80189f853bfa2a", kill_on_drop: false }`
[INFO] [stdout] bcf332e4c1996127024ddc57d2c96f30640c344f3d9f26193f80189f853bfa2a