[INFO] cloning repository https://github.com/federicomenaquintero/saiba-parser
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/federicomenaquintero/saiba-parser" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffedericomenaquintero%2Fsaiba-parser", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffedericomenaquintero%2Fsaiba-parser'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7a39a889fe06ee0b61d768f7f7d625247b91e292
[INFO] documenting federicomenaquintero/saiba-parser 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%2Ffedericomenaquintero%2Fsaiba-parser" "/workspace/builds/worker-26/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-26/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/federicomenaquintero/saiba-parser 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/federicomenaquintero/saiba-parser
[INFO] finished tweaking git repo https://github.com/federicomenaquintero/saiba-parser
[INFO] tweaked toml for git repo https://github.com/federicomenaquintero/saiba-parser written to /workspace/builds/worker-26/source/Cargo.toml
[INFO] crate git repo https://github.com/federicomenaquintero/saiba-parser 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]  Downloading crates ...
[INFO] [stderr]   Downloaded backtrace v0.3.2
[INFO] [stderr]   Downloaded backtrace-sys v0.1.11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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] [stdout] 1f2eb27ab0c8390f58d0067f3d99857f7340ea966790709a2d952311ff9276fd
[INFO] running `Command { std: "docker" "start" "-a" "1f2eb27ab0c8390f58d0067f3d99857f7340ea966790709a2d952311ff9276fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1f2eb27ab0c8390f58d0067f3d99857f7340ea966790709a2d952311ff9276fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f2eb27ab0c8390f58d0067f3d99857f7340ea966790709a2d952311ff9276fd", kill_on_drop: false }`
[INFO] [stdout] 1f2eb27ab0c8390f58d0067f3d99857f7340ea966790709a2d952311ff9276fd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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] 41ac6ea3e017d20c9ba3465e463201bc6f45ddd8b4a049832cb064e90e45eeec
[INFO] running `Command { std: "docker" "start" "-a" "41ac6ea3e017d20c9ba3465e463201bc6f45ddd8b4a049832cb064e90e45eeec", kill_on_drop: false }`
[INFO] [stderr]    Compiling gcc v0.3.51
[INFO] [stderr]     Checking libc v0.2.26
[INFO] [stderr]     Checking rustc-demangle v0.1.4
[INFO] [stderr]     Checking cfg-if v0.1.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.11
[INFO] [stderr]     Checking backtrace v0.3.2
[INFO] [stderr]     Checking error-chain v0.10.0
[INFO] [stderr]  Documenting saiba-parser 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(str_checked_slicing)]
[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 `saiba-parser`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name saiba_parser src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=63f0f96f1722e799 -L dependency=/opt/rustwide/target/debug/deps --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-91ebe19680e8bb31.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "41ac6ea3e017d20c9ba3465e463201bc6f45ddd8b4a049832cb064e90e45eeec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41ac6ea3e017d20c9ba3465e463201bc6f45ddd8b4a049832cb064e90e45eeec", kill_on_drop: false }`
[INFO] [stdout] 41ac6ea3e017d20c9ba3465e463201bc6f45ddd8b4a049832cb064e90e45eeec