[INFO] cloning repository https://github.com/foldu/iv
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/foldu/iv" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffoldu%2Fiv", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffoldu%2Fiv'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5fcd836130bcdd268765f5080755b576a7d6908f
[INFO] documenting foldu/iv 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%2Ffoldu%2Fiv" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/foldu/iv 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/foldu/iv
[INFO] finished tweaking git repo https://github.com/foldu/iv
[INFO] tweaked toml for git repo https://github.com/foldu/iv written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/foldu/iv 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 951a6fc50bb586725b763539fdf295ae14df0e09588de792ebf046df5149efbc
[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" "951a6fc50bb586725b763539fdf295ae14df0e09588de792ebf046df5149efbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "951a6fc50bb586725b763539fdf295ae14df0e09588de792ebf046df5149efbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "951a6fc50bb586725b763539fdf295ae14df0e09588de792ebf046df5149efbc", kill_on_drop: false }`
[INFO] [stdout] 951a6fc50bb586725b763539fdf295ae14df0e09588de792ebf046df5149efbc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] b83671255874a69c12ab0a9c9be7bd4bf56759f0eaf163fd925888538213c25a
[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" "b83671255874a69c12ab0a9c9be7bd4bf56759f0eaf163fd925888538213c25a", kill_on_drop: false }`
[INFO] [stderr]    Compiling pkg-config v0.3.15
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]    Compiling cc v1.0.40
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]    Compiling getrandom v0.1.9
[INFO] [stderr]    Compiling gio v0.7.0
[INFO] [stderr]    Compiling gdk-pixbuf v0.7.0
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling cairo-rs v0.7.1
[INFO] [stderr]    Compiling pango v0.7.0
[INFO] [stderr]     Checking fragile v0.3.0
[INFO] [stderr]    Compiling rayon-core v1.5.0
[INFO] [stderr]    Compiling atk v0.7.0
[INFO] [stderr]     Checking adler32 v1.0.3
[INFO] [stderr]    Compiling gdk v0.11.0
[INFO] [stderr]    Compiling serde v1.0.98
[INFO] [stderr]    Compiling magic-sys v0.2.0
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling gtk v0.7.0
[INFO] [stderr]     Checking same-file v1.0.5
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling unicase v2.4.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking miniz_oxide v0.3.2
[INFO] [stderr]     Checking walkdir v2.2.9
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking magic v0.12.2
[INFO] [stderr]     Checking directories v2.0.2
[INFO] [stderr]    Compiling glib-sys v0.9.0
[INFO] [stderr]    Compiling gobject-sys v0.9.0
[INFO] [stderr]    Compiling gio-sys v0.9.0
[INFO] [stderr]    Compiling gdk-pixbuf-sys v0.9.0
[INFO] [stderr]    Compiling cairo-sys-rs v0.9.0
[INFO] [stderr]    Compiling pango-sys v0.9.0
[INFO] [stderr]    Compiling gdk-sys v0.9.0
[INFO] [stderr]    Compiling atk-sys v0.9.0
[INFO] [stderr]    Compiling gtk-sys v0.9.0
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking mime v0.3.13
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking crossbeam-deque v0.6.3
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]    Compiling bzip2-sys v0.1.7
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]     Checking rayon v1.1.0
[INFO] [stderr]     Checking flate2 v1.0.11
[INFO] [stderr]     Checking noisy_float v0.1.11
[INFO] [stderr]     Checking bzip2 v0.3.3
[INFO] [stderr]     Checking backtrace v0.3.34
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking glib v0.8.1
[INFO] [stderr]     Checking zip v0.5.3
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling serde_derive v1.0.98
[INFO] [stderr]     Checking toml v0.5.3
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]  Documenting iv v0.3.2 (/opt/rustwide/workdir)
[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(try_from)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `iv`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name iv 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 --extern directories=/opt/rustwide/target/debug/deps/libdirectories-5bcd6e60b7e28489.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-d2b8065a053b8fcc.rmeta --extern gdk=/opt/rustwide/target/debug/deps/libgdk-31dfff703d71c5ef.rmeta --extern gdk_pixbuf=/opt/rustwide/target/debug/deps/libgdk_pixbuf-502f768329d65370.rmeta --extern gio=/opt/rustwide/target/debug/deps/libgio-f3b9714242568a10.rmeta --extern glib=/opt/rustwide/target/debug/deps/libglib-050f77a6b197ac54.rmeta --extern gtk=/opt/rustwide/target/debug/deps/libgtk-f4b6df8e527c1927.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-77e2ef5fdd5178d7.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-09be1e3f269d05b8.rmeta --extern magic=/opt/rustwide/target/debug/deps/libmagic-e6a650fc95ba25ff.rmeta --extern mime=/opt/rustwide/target/debug/deps/libmime-8cac062a16e402ba.rmeta --extern noisy_float=/opt/rustwide/target/debug/deps/libnoisy_float-90472c7bfa19df1f.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-6912ee462d26fa58.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-ac2c380fe7a7ff9a.rmeta --extern pango=/opt/rustwide/target/debug/deps/libpango-0fa468ebac058650.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-e64aba2e6fd88c45.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-8572575a072ad6b9.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-254eaf83689dfa6f.so --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-01dad061f2cfbbd4.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-7eb403b0a6365e6a.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-a0d7af5857aa8cfb.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-70ab86e5cab5ba98.rmeta --extern zip=/opt/rustwide/target/debug/deps/libzip-92e947629decaa60.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "b83671255874a69c12ab0a9c9be7bd4bf56759f0eaf163fd925888538213c25a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b83671255874a69c12ab0a9c9be7bd4bf56759f0eaf163fd925888538213c25a", kill_on_drop: false }`
[INFO] [stdout] b83671255874a69c12ab0a9c9be7bd4bf56759f0eaf163fd925888538213c25a