[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#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbenesch%2Frust-play" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/benesch/rust-play on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "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-2-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "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]      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 v0.7.3
[INFO] [stderr]   Downloaded abomonation_derive v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fb6b76629b3322f627df74e7a26d38b2bfe58920ad3b63aeaa2541c4edb10d5d
[INFO] running `Command { std: "docker" "start" "-a" "fb6b76629b3322f627df74e7a26d38b2bfe58920ad3b63aeaa2541c4edb10d5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb6b76629b3322f627df74e7a26d38b2bfe58920ad3b63aeaa2541c4edb10d5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb6b76629b3322f627df74e7a26d38b2bfe58920ad3b63aeaa2541c4edb10d5d", kill_on_drop: false }`
[INFO] [stdout] fb6b76629b3322f627df74e7a26d38b2bfe58920ad3b63aeaa2541c4edb10d5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 968e3305b437e20ed0df5f56efafa0d9401437f4082e2c1365ad50189be23bbe
[INFO] running `Command { std: "docker" "start" "-a" "968e3305b437e20ed0df5f56efafa0d9401437f4082e2c1365ad50189be23bbe", kill_on_drop: false }`
[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]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking timely_bytes v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking timely_logging v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking abomonation v0.7.3
[INFO] [stderr]     Checking timely_sort v0.1.6
[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 abomonation_derive v0.4.0
[INFO] [stderr]    Compiling serde_derive v1.0.99
[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 6.81s
[INFO] running `Command { std: "docker" "inspect" "968e3305b437e20ed0df5f56efafa0d9401437f4082e2c1365ad50189be23bbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "968e3305b437e20ed0df5f56efafa0d9401437f4082e2c1365ad50189be23bbe", kill_on_drop: false }`
[INFO] [stdout] 968e3305b437e20ed0df5f56efafa0d9401437f4082e2c1365ad50189be23bbe
[INFO] checking benesch/rust-play against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbenesch%2Frust-play" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/benesch/rust-play on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "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-2-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/benesch/timely-dataflow.git`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6bb46136470bcc3477cf6583ad94ebbf2d43ff78fd054f9f53a447d4766c7e2c
[INFO] running `Command { std: "docker" "start" "-a" "6bb46136470bcc3477cf6583ad94ebbf2d43ff78fd054f9f53a447d4766c7e2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6bb46136470bcc3477cf6583ad94ebbf2d43ff78fd054f9f53a447d4766c7e2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6bb46136470bcc3477cf6583ad94ebbf2d43ff78fd054f9f53a447d4766c7e2c", kill_on_drop: false }`
[INFO] [stdout] 6bb46136470bcc3477cf6583ad94ebbf2d43ff78fd054f9f53a447d4766c7e2c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 605246c2fc12ab9ee9d5eb20b8fb593616985f390213f51438aac451f1acedbf
[INFO] running `Command { std: "docker" "start" "-a" "605246c2fc12ab9ee9d5eb20b8fb593616985f390213f51438aac451f1acedbf", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.1
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling syn v1.0.3
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking timely_bytes v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking timely_logging v0.10.0 (https://github.com/benesch/timely-dataflow.git?branch=sample#775c22d6)
[INFO] [stderr]     Checking abomonation v0.7.3
[INFO] [stderr]     Checking timely_sort v0.1.6
[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] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/git/checkouts/timely-dataflow-f91eaadf87f75a36/775c22d/timely/src/progress/subgraph.rs:662:17
[INFO] [stdout]     |
[INFO] [stdout] 662 |                 panic!();
[INFO] [stdout]     |                 ^^^^^^^^ cannot infer type
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `$crate::panic::panic_2015` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `timely` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "605246c2fc12ab9ee9d5eb20b8fb593616985f390213f51438aac451f1acedbf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "605246c2fc12ab9ee9d5eb20b8fb593616985f390213f51438aac451f1acedbf", kill_on_drop: false }`
[INFO] [stdout] 605246c2fc12ab9ee9d5eb20b8fb593616985f390213f51438aac451f1acedbf