[INFO] cloning repository https://github.com/MOZGIII/async-std-issue-274
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MOZGIII/async-std-issue-274" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMOZGIII%2Fasync-std-issue-274", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMOZGIII%2Fasync-std-issue-274'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 933713d2756931c58d53b0e58b8556431494c2ac
[INFO] documenting MOZGIII/async-std-issue-274 against try#6ee483316d2e4581572121d60a955affb2032eb3+cargoflags=-Zrustdoc-scrape-examples for scrape-examples
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMOZGIII%2Fasync-std-issue-274" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MOZGIII/async-std-issue-274 on toolchain 6ee483316d2e4581572121d60a955affb2032eb3
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6ee483316d2e4581572121d60a955affb2032eb3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MOZGIII/async-std-issue-274
[INFO] finished tweaking git repo https://github.com/MOZGIII/async-std-issue-274
[INFO] tweaked toml for git repo https://github.com/MOZGIII/async-std-issue-274 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/MOZGIII/async-std-issue-274 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6ee483316d2e4581572121d60a955affb2032eb3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:bb5b0feb4f87116a4ea905b7ff5bf5b85913db05e9f0fbc1abdd3168928d9075" "/opt/rustwide/cargo-home/bin/cargo" "+6ee483316d2e4581572121d60a955affb2032eb3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2ff4ca3c61bbdafd9faaed528930b41a91f574169bd39656165d2ab6318bdfa2
[INFO] running `Command { std: "docker" "start" "-a" "2ff4ca3c61bbdafd9faaed528930b41a91f574169bd39656165d2ab6318bdfa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2ff4ca3c61bbdafd9faaed528930b41a91f574169bd39656165d2ab6318bdfa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ff4ca3c61bbdafd9faaed528930b41a91f574169bd39656165d2ab6318bdfa2", kill_on_drop: false }`
[INFO] [stdout] 2ff4ca3c61bbdafd9faaed528930b41a91f574169bd39656165d2ab6318bdfa2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:bb5b0feb4f87116a4ea905b7ff5bf5b85913db05e9f0fbc1abdd3168928d9075" "/opt/rustwide/cargo-home/bin/cargo" "+6ee483316d2e4581572121d60a955affb2032eb3" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json" "-Zrustdoc-scrape-examples", kill_on_drop: false }`
[INFO] [stdout] 4f77af684fb2ef84bf5a3c77f9a0fbc112e3747826466ba9b9b7cbb11cf187bb
[INFO] running `Command { std: "docker" "start" "-a" "4f77af684fb2ef84bf5a3c77f9a0fbc112e3747826466ba9b9b7cbb11cf187bb", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking async-task v1.0.0
[INFO] [stderr]     Checking kv-log-macro v1.0.4
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr]     Checking async-macros v1.0.0
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking mio v0.6.19
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking futures-timer v0.4.0
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking async-std v0.99.7
[INFO] [stderr] warning: failed to check lib in package `async-std` as a prerequisite for scraping examples from: bin "async-std-issue-274"
[INFO] [stderr]     Try running with `--verbose` to see the error message.
[INFO] [stderr]     If an example or library should not be scanned, then consider adding `doc-scrape-examples = false` to its `[[example]]` or `[lib]` definition in /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/async-std-0.99.7/Cargo.toml
[INFO] [stderr] warning: `async-std` (lib) generated 1 warning
[INFO] [stderr]     Scraping async-std-issue-274 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting async-std-issue-274 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.30s
[INFO] running `Command { std: "docker" "inspect" "4f77af684fb2ef84bf5a3c77f9a0fbc112e3747826466ba9b9b7cbb11cf187bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f77af684fb2ef84bf5a3c77f9a0fbc112e3747826466ba9b9b7cbb11cf187bb", kill_on_drop: false }`
[INFO] [stdout] 4f77af684fb2ef84bf5a3c77f9a0fbc112e3747826466ba9b9b7cbb11cf187bb