[INFO] cloning repository https://github.com/benesch/rust-play
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/benesch/rust-play" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbenesch%2Frust-play", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbenesch%2Frust-play'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6149e7277905e77e2bd2b9fc4670cae48ec197c3
[INFO] checking benesch/rust-play against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbenesch%2Frust-play" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/benesch/rust-play on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/benesch/rust-play
[INFO] finished tweaking git repo https://github.com/benesch/rust-play
[INFO] tweaked toml for git repo https://github.com/benesch/rust-play written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/benesch/rust-play already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/benesch/timely-dataflow.git`
[INFO] [stderr]     Updating git repository `https://github.com/TimelyDataflow/differential-dataflow.git`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 4 packages
[INFO] [stderr]       Adding timely v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]       Adding timely_bytes v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]       Adding timely_communication v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]       Adding timely_logging v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded abomonation_derive v0.4.0
[INFO] [stderr]   Downloaded timely_sort v0.1.6
[INFO] [stderr]   Downloaded abomonation_derive v0.3.0
[INFO] [stderr]   Downloaded abomonation v0.7.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ecaf3a3061390525c9234484a815677a7dbb219235a2778427f6a1f1b07a8786
[INFO] running `Command { std: "docker" "start" "-a" "ecaf3a3061390525c9234484a815677a7dbb219235a2778427f6a1f1b07a8786", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ecaf3a3061390525c9234484a815677a7dbb219235a2778427f6a1f1b07a8786", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ecaf3a3061390525c9234484a815677a7dbb219235a2778427f6a1f1b07a8786", kill_on_drop: false }`
[INFO] [stdout] ecaf3a3061390525c9234484a815677a7dbb219235a2778427f6a1f1b07a8786
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b2da04f6c371dbd0fe3ccd16546536573000c9962d9377efb94019f69f66b67b
[INFO] running `Command { std: "docker" "start" "-a" "b2da04f6c371dbd0fe3ccd16546536573000c9962d9377efb94019f69f66b67b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.1
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling syn v1.0.3
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking timely_bytes v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking abomonation v0.7.3
[INFO] [stderr]     Checking timely_logging v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking timely_sort v0.1.6
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]    Compiling abomonation_derive v0.3.0
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]    Compiling abomonation_derive v0.4.0
[INFO] [stderr]     Checking timely_communication v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking timely v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking differential-dataflow v0.10.0 (https://github.com/TimelyDataflow/differential-dataflow.git#c78b860a)
[INFO] [stderr]     Checking rust-play v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 17.18s
[INFO] running `Command { std: "docker" "inspect" "b2da04f6c371dbd0fe3ccd16546536573000c9962d9377efb94019f69f66b67b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2da04f6c371dbd0fe3ccd16546536573000c9962d9377efb94019f69f66b67b", kill_on_drop: false }`
[INFO] [stdout] b2da04f6c371dbd0fe3ccd16546536573000c9962d9377efb94019f69f66b67b
[INFO] checking benesch/rust-play against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbenesch%2Frust-play" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/benesch/rust-play on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/benesch/rust-play
[INFO] finished tweaking git repo https://github.com/benesch/rust-play
[INFO] tweaked toml for git repo https://github.com/benesch/rust-play written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/benesch/rust-play already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/benesch/timely-dataflow.git`
[INFO] [stderr]      Locking 4 packages
[INFO] [stderr]       Adding timely v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]       Adding timely_bytes v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]       Adding timely_communication v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]       Adding timely_logging v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 02d4ca8afff760bdbb306472e078716e042dd0c7d4baaa6d84a38ea39629f38d
[INFO] running `Command { std: "docker" "start" "-a" "02d4ca8afff760bdbb306472e078716e042dd0c7d4baaa6d84a38ea39629f38d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "02d4ca8afff760bdbb306472e078716e042dd0c7d4baaa6d84a38ea39629f38d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "02d4ca8afff760bdbb306472e078716e042dd0c7d4baaa6d84a38ea39629f38d", kill_on_drop: false }`
[INFO] [stdout] 02d4ca8afff760bdbb306472e078716e042dd0c7d4baaa6d84a38ea39629f38d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f2f816ed5626ea7df865bfdca68c2ff60485a91e7518f14a7a087481a5cd9c86
[INFO] running `Command { std: "docker" "start" "-a" "f2f816ed5626ea7df865bfdca68c2ff60485a91e7518f14a7a087481a5cd9c86", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling proc-macro2 v1.0.1
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling syn v1.0.3
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking abomonation v0.7.3
[INFO] [stderr]     Checking timely_logging v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking timely_bytes v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking timely_sort v0.1.6
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling abomonation_derive v0.3.0
[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling abomonation_derive v0.4.0
[INFO] [stderr]     Checking timely_communication v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking timely v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking differential-dataflow v0.10.0 (https://github.com/TimelyDataflow/differential-dataflow.git#c78b860a)
[INFO] [stderr]     Checking rust-play v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.68s
[INFO] running `Command { std: "docker" "inspect" "f2f816ed5626ea7df865bfdca68c2ff60485a91e7518f14a7a087481a5cd9c86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2f816ed5626ea7df865bfdca68c2ff60485a91e7518f14a7a087481a5cd9c86", kill_on_drop: false }`
[INFO] [stdout] f2f816ed5626ea7df865bfdca68c2ff60485a91e7518f14a7a087481a5cd9c86