[INFO] fetching crate tower-spawn-ready 0.3.0...
[INFO] checking tower-spawn-ready-0.3.0 against try#8b72f65b805cbe4c261de45030d663f524f27376 for pr-78991
[INFO] extracting crate tower-spawn-ready 0.3.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate tower-spawn-ready 0.3.0 on toolchain 8b72f65b805cbe4c261de45030d663f524f27376
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tower-spawn-ready 0.3.0
[INFO] finished tweaking crates.io crate tower-spawn-ready 0.3.0
[INFO] tweaked toml for crates.io crate tower-spawn-ready 0.3.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eeeb2adf28514b0ea0d0fbbd917a280117f0522f53fe1a175fff92ef9f169e34
[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" "eeeb2adf28514b0ea0d0fbbd917a280117f0522f53fe1a175fff92ef9f169e34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eeeb2adf28514b0ea0d0fbbd917a280117f0522f53fe1a175fff92ef9f169e34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eeeb2adf28514b0ea0d0fbbd917a280117f0522f53fe1a175fff92ef9f169e34", kill_on_drop: false }`
[INFO] [stdout] eeeb2adf28514b0ea0d0fbbd917a280117f0522f53fe1a175fff92ef9f169e34
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+8b72f65b805cbe4c261de45030d663f524f27376" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5ce062fb982eb09e8b347f49c413a5a3932aa6ed22c8df5d7cdf7a0a261c0db4
[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" "5ce062fb982eb09e8b347f49c413a5a3932aa6ed22c8df5d7cdf7a0a261c0db4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]     Checking futures-core v0.3.8
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking futures-task v0.3.8
[INFO] [stderr]     Checking tower-service v0.3.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling pin-project-internal v1.0.1
[INFO] [stderr]    Compiling pin-project-internal v0.4.27
[INFO] [stderr]     Checking tokio v0.2.23
[INFO] [stderr]     Checking pin-project v1.0.1
[INFO] [stderr]     Checking futures-util v0.3.8
[INFO] [stderr]     Checking pin-project v0.4.27
[INFO] [stderr]     Checking tokio-test v0.2.1
[INFO] [stderr]     Checking tower-test v0.3.0
[INFO] [stderr]     Checking tower-spawn-ready v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `to_string` found for unit type `()` in the current scope
[INFO] [stdout]   --> tests/spawn_ready.rs:32:49
[INFO] [stdout]    |
[INFO] [stdout] 32 |         assert_ready_err!(service.poll_ready()).to_string(),
[INFO] [stdout]    |                                                 ^^^^^^^^^ method not found in `()`
[INFO] [stdout]    |
[INFO] [stdout]    = note: the method `to_string` exists but the following trait bounds were not satisfied:
[INFO] [stdout]            `(): std::fmt::Display`
[INFO] [stdout]            which is required by `(): ToString`
[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 E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tower-spawn-ready`
[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" "5ce062fb982eb09e8b347f49c413a5a3932aa6ed22c8df5d7cdf7a0a261c0db4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ce062fb982eb09e8b347f49c413a5a3932aa6ed22c8df5d7cdf7a0a261c0db4", kill_on_drop: false }`
[INFO] [stdout] 5ce062fb982eb09e8b347f49c413a5a3932aa6ed22c8df5d7cdf7a0a261c0db4