[INFO] fetching crate backoff 0.4.0...
[INFO] checking backoff-0.4.0 against master#7036449c774860a5b348dbbe01c20704c557382e for pr-98456
[INFO] extracting crate backoff 0.4.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate backoff 0.4.0 on toolchain 7036449c774860a5b348dbbe01c20704c557382e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7036449c774860a5b348dbbe01c20704c557382e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate backoff 0.4.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate backoff 0.4.0
[INFO] tweaked toml for crates.io crate backoff 0.4.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate backoff 0.4.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7036449c774860a5b348dbbe01c20704c557382e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+7036449c774860a5b348dbbe01c20704c557382e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cbd5320a605601c5d8a911ffcf778396d79984ee1dc79514c9d4a8f9167bc801
[INFO] running `Command { std: "docker" "start" "-a" "cbd5320a605601c5d8a911ffcf778396d79984ee1dc79514c9d4a8f9167bc801", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cbd5320a605601c5d8a911ffcf778396d79984ee1dc79514c9d4a8f9167bc801", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbd5320a605601c5d8a911ffcf778396d79984ee1dc79514c9d4a8f9167bc801", kill_on_drop: false }`
[INFO] [stdout] cbd5320a605601c5d8a911ffcf778396d79984ee1dc79514c9d4a8f9167bc801
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+7036449c774860a5b348dbbe01c20704c557382e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 961c16b3b8283617be69a185e234805cbf2980c178a74fdbe7d7f1a61c960783
[INFO] running `Command { std: "docker" "start" "-a" "961c16b3b8283617be69a185e234805cbf2980c178a74fdbe7d7f1a61c960783", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling syn v1.0.60
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[INFO] [stderr]     Checking backoff v0.4.0 (/opt/rustwide/workdir)
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[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 58.87s
[INFO] running `Command { std: "docker" "inspect" "961c16b3b8283617be69a185e234805cbf2980c178a74fdbe7d7f1a61c960783", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "961c16b3b8283617be69a185e234805cbf2980c178a74fdbe7d7f1a61c960783", kill_on_drop: false }`
[INFO] [stdout] 961c16b3b8283617be69a185e234805cbf2980c178a74fdbe7d7f1a61c960783