[INFO] fetching crate prty 0.1.1...
[INFO] checking prty-0.1.1 against master#9503ea19edbf01b9435e80e17d60ce1b88390116 for pr-81782
[INFO] extracting crate prty 0.1.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate prty 0.1.1 on toolchain 9503ea19edbf01b9435e80e17d60ce1b88390116
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate prty 0.1.1
[INFO] finished tweaking crates.io crate prty 0.1.1
[INFO] tweaked toml for crates.io crate prty 0.1.1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "fetch" "--locked" "--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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7af0ac951259cbb1126287a3247beddff57801b8ff0575251e10f2f9e85422f7
[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" "7af0ac951259cbb1126287a3247beddff57801b8ff0575251e10f2f9e85422f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7af0ac951259cbb1126287a3247beddff57801b8ff0575251e10f2f9e85422f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7af0ac951259cbb1126287a3247beddff57801b8ff0575251e10f2f9e85422f7", kill_on_drop: false }`
[INFO] [stdout] 7af0ac951259cbb1126287a3247beddff57801b8ff0575251e10f2f9e85422f7
[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" "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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 06a8a2a7bc446889e990368ce3a5222a6d3e23183c3893cca7844f70bdf43aca
[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" "06a8a2a7bc446889e990368ce3a5222a6d3e23183c3893cca7844f70bdf43aca", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.67
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling matches v0.1.8
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]    Compiling bitflags v0.1.1
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling scopeguard v0.2.0
[INFO] [stderr]    Compiling quick-error v0.1.4
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]     Checking prty_fmtmodifier v0.1.1
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking bit-vec v0.4.4
[INFO] [stderr]     Checking compare v0.1.0
[INFO] [stderr]    Compiling tinyvec v1.1.1
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling map_in_place v0.1.0
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking prty_bitgraph v0.1.1
[INFO] [stderr]    Compiling peg v0.5.7
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking bit-set v0.4.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking measure_time v0.6.0
[INFO] [stdout] error[E0635]: unknown feature `vec_remove_item`
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/prty_bitgraph-0.1.1/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(vec_remove_item)]
[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 E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `prty_bitgraph`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "06a8a2a7bc446889e990368ce3a5222a6d3e23183c3893cca7844f70bdf43aca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06a8a2a7bc446889e990368ce3a5222a6d3e23183c3893cca7844f70bdf43aca", kill_on_drop: false }`
[INFO] [stdout] 06a8a2a7bc446889e990368ce3a5222a6d3e23183c3893cca7844f70bdf43aca