[INFO] fetching crate rcs_backend 0.2.1...
[INFO] checking rcs_backend-0.2.1 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate rcs_backend 0.2.1 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate rcs_backend 0.2.1 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 crates.io crate rcs_backend 0.2.1
[INFO] finished tweaking crates.io crate rcs_backend 0.2.1
[INFO] tweaked toml for crates.io crate rcs_backend 0.2.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate rcs_backend 0.2.1 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 crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num_threads v0.1.3
[INFO] [stderr]   Downloaded time-macros v0.2.3
[INFO] [stderr]   Downloaded async-tungstenite v0.16.1
[INFO] [stderr]   Downloaded hyperlocal v0.8.0
[INFO] [stderr]   Downloaded time v0.3.7
[INFO] [stderr]   Downloaded pin-project v0.4.29
[INFO] [stderr]   Downloaded pin-project-internal v0.4.29
[INFO] [stderr]   Downloaded futures_codec v0.4.1
[INFO] [stderr]   Downloaded hyper-tungstenite v0.5.0
[INFO] [stderr]   Downloaded libc v0.2.118
[INFO] [stderr]   Downloaded tracing v0.1.30
[INFO] [stderr]   Downloaded docker-api v0.8.0
[INFO] [stderr]   Downloaded jsonwebtoken v8.0.1
[INFO] [stderr]   Downloaded simple_asn1 v0.6.1
[INFO] [stderr]   Downloaded tokio-tungstenite v0.16.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 57609e839a9ff6ecbabbb28e541015e05dde24e5e115376aa3b39ad5e9e884ae
[INFO] running `Command { std: "docker" "start" "-a" "57609e839a9ff6ecbabbb28e541015e05dde24e5e115376aa3b39ad5e9e884ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57609e839a9ff6ecbabbb28e541015e05dde24e5e115376aa3b39ad5e9e884ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57609e839a9ff6ecbabbb28e541015e05dde24e5e115376aa3b39ad5e9e884ae", kill_on_drop: false }`
[INFO] [stdout] 57609e839a9ff6ecbabbb28e541015e05dde24e5e115376aa3b39ad5e9e884ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] b2c5484ab830db52f5c6bd34876b0635f0cd0446bace342863bb83bec34f8911
[INFO] running `Command { std: "docker" "start" "-a" "b2c5484ab830db52f5c6bd34876b0635f0cd0446bace342863bb83bec34f8911", kill_on_drop: false }`
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[INFO] [stderr]     Checking rcs_backend v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.64s
[INFO] running `Command { std: "docker" "inspect" "b2c5484ab830db52f5c6bd34876b0635f0cd0446bace342863bb83bec34f8911", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2c5484ab830db52f5c6bd34876b0635f0cd0446bace342863bb83bec34f8911", kill_on_drop: false }`
[INFO] [stdout] b2c5484ab830db52f5c6bd34876b0635f0cd0446bace342863bb83bec34f8911