[INFO] cloning repository https://github.com/utkarshkukreti/pipette
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/utkarshkukreti/pipette" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Futkarshkukreti%2Fpipette", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Futkarshkukreti%2Fpipette'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 868323ee9c6776157b798cd7582493020f963027
[INFO] documenting utkarshkukreti/pipette against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Futkarshkukreti%2Fpipette" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/utkarshkukreti/pipette on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/utkarshkukreti/pipette
[INFO] finished tweaking git repo https://github.com/utkarshkukreti/pipette
[INFO] tweaked toml for git repo https://github.com/utkarshkukreti/pipette written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/utkarshkukreti/pipette already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3bb7ad0be8a430b0b2d567e555823d6d87e5ed0166ad791a9bab8d6215b80420
[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" "3bb7ad0be8a430b0b2d567e555823d6d87e5ed0166ad791a9bab8d6215b80420", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3bb7ad0be8a430b0b2d567e555823d6d87e5ed0166ad791a9bab8d6215b80420", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bb7ad0be8a430b0b2d567e555823d6d87e5ed0166ad791a9bab8d6215b80420", kill_on_drop: false }`
[INFO] [stdout] 3bb7ad0be8a430b0b2d567e555823d6d87e5ed0166ad791a9bab8d6215b80420
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f81f8d74d3270cb9db855095129ee418b15273e3a98c8f2226c3d952b66bfd8e
[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" "f81f8d74d3270cb9db855095129ee418b15273e3a98c8f2226c3d952b66bfd8e", kill_on_drop: false }`
[INFO] [stderr]  Documenting pipette v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0412]: cannot find type `Chars` in module `io`
[INFO] [stdout]  --> src/reader.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |     inner: io::Chars<R>
[INFO] [stdout]   |                ^^^^^ not found in `io`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::str::Chars;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `CharsError` in module `io`
[INFO] [stdout]   --> src/reader.rs:28:54
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn read(&mut self) -> Option<Result<Key, io::CharsError>> {
[INFO] [stdout]    |                                                      ^^^^^^^^^^ not found in `io`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `pipette`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name pipette src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "f81f8d74d3270cb9db855095129ee418b15273e3a98c8f2226c3d952b66bfd8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f81f8d74d3270cb9db855095129ee418b15273e3a98c8f2226c3d952b66bfd8e", kill_on_drop: false }`
[INFO] [stdout] f81f8d74d3270cb9db855095129ee418b15273e3a98c8f2226c3d952b66bfd8e