[INFO] cloning repository https://github.com/kirillkh/xword_constructor
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kirillkh/xword_constructor" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkirillkh%2Fxword_constructor", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkirillkh%2Fxword_constructor'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a0c41e39d0fbe016dec80429df8b32fc39579fe5
[INFO] documenting kirillkh/xword_constructor 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%2Fkirillkh%2Fxword_constructor" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kirillkh/xword_constructor 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/kirillkh/xword_constructor
[INFO] finished tweaking git repo https://github.com/kirillkh/xword_constructor
[INFO] tweaked toml for git repo https://github.com/kirillkh/xword_constructor written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/kirillkh/xword_constructor 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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] d5c624a7d43c24fc86390e77c99d91773beb21098a199228c0681207ad682f07
[INFO] running `Command { std: "docker" "start" "-a" "d5c624a7d43c24fc86390e77c99d91773beb21098a199228c0681207ad682f07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5c624a7d43c24fc86390e77c99d91773beb21098a199228c0681207ad682f07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5c624a7d43c24fc86390e77c99d91773beb21098a199228c0681207ad682f07", kill_on_drop: false }`
[INFO] [stdout] d5c624a7d43c24fc86390e77c99d91773beb21098a199228c0681207ad682f07
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 4df546194845e942ed03adeba0ee40e8aa063a7c439fc06d2da366f627d0557f
[INFO] running `Command { std: "docker" "start" "-a" "4df546194845e942ed03adeba0ee40e8aa063a7c439fc06d2da366f627d0557f", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.8
[INFO] [stderr]     Checking either v1.0.1
[INFO] [stderr]    Compiling ndarray v0.6.8
[INFO] [stderr]     Checking num-traits v0.1.36
[INFO] [stderr]     Checking utf8-ranges v0.1.3
[INFO] [stderr]     Checking mempool v0.2.0
[INFO] [stderr]     Checking bit-vec v0.4.3
[INFO] [stderr]     Checking regex-syntax v0.3.1
[INFO] [stderr]     Checking itertools v0.5.5
[INFO] [stderr]     Checking matrixmultiply v0.1.11
[INFO] [stderr]     Checking getopts v0.2.14
[INFO] [stderr]     Checking bit-set v0.4.0
[INFO] [stderr]     Checking fnv v1.0.5
[INFO] [stderr]     Checking memchr v0.1.10
[INFO] [stderr]     Checking rand v0.3.14
[INFO] [stderr]     Checking aho-corasick v0.5.1
[INFO] [stderr] warning: failed to check lib in package `getopts` as a prerequisite for scraping examples from: bin "probgen", lib
[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/getopts-0.2.14/Cargo.toml
[INFO] [stderr] warning: `getopts` (lib) generated 1 warning
[INFO] [stderr]     Checking num-complex v0.1.35
[INFO] [stderr]     Checking regex v0.1.61
[INFO] [stderr]     Checking xword_constructor v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Scraping xword_constructor v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting xword_constructor v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(specialization)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]   = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.44s
[INFO] running `Command { std: "docker" "inspect" "4df546194845e942ed03adeba0ee40e8aa063a7c439fc06d2da366f627d0557f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4df546194845e942ed03adeba0ee40e8aa063a7c439fc06d2da366f627d0557f", kill_on_drop: false }`
[INFO] [stdout] 4df546194845e942ed03adeba0ee40e8aa063a7c439fc06d2da366f627d0557f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "DOCS_RS=1" "-e" "RUSTC_BOOTSTRAP=1" "-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" "rustdoc" "--lib" "-Zrustdoc-map" "-Z" "unstable-options" "--config" "build.rustdocflags=[\"-Z\", \"unstable-options\", \"--document-private-items\"]" "--frozen" "--message-format=json" "-Zrustdoc-scrape-examples", kill_on_drop: false }`
[INFO] [stdout] b4654c31b57604ccfedb306dffb75937bdedaf0809246c78a187a5165b416beb
[INFO] running `Command { std: "docker" "start" "-a" "b4654c31b57604ccfedb306dffb75937bdedaf0809246c78a187a5165b416beb", kill_on_drop: false }`
[INFO] [stderr]     Checking getopts v0.2.14
[INFO] [stderr] warning: failed to check lib in package `getopts` as a prerequisite for scraping examples from: lib
[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/getopts-0.2.14/Cargo.toml
[INFO] [stderr] warning: `getopts` (lib) generated 1 warning
[INFO] [stderr]     Scraping xword_constructor v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting xword_constructor v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(specialization)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]   = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.97s
[INFO] running `Command { std: "docker" "inspect" "b4654c31b57604ccfedb306dffb75937bdedaf0809246c78a187a5165b416beb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4654c31b57604ccfedb306dffb75937bdedaf0809246c78a187a5165b416beb", kill_on_drop: false }`
[INFO] [stdout] b4654c31b57604ccfedb306dffb75937bdedaf0809246c78a187a5165b416beb