[INFO] fetching crate es_balk 0.1.0...
[INFO] checking es_balk-0.1.0 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate es_balk 0.1.0 into /workspace/builds/worker-27/source
[INFO] validating manifest of crates.io crate es_balk 0.1.0 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate es_balk 0.1.0
[INFO] finished tweaking crates.io crate es_balk 0.1.0
[INFO] tweaked toml for crates.io crate es_balk 0.1.0 written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4c9b1a3a25e73f1d6de1920ddb6705e52913d12017ebe8ef253aaff7af871429
[INFO] running `Command { std: "docker" "start" "-a" "4c9b1a3a25e73f1d6de1920ddb6705e52913d12017ebe8ef253aaff7af871429", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c9b1a3a25e73f1d6de1920ddb6705e52913d12017ebe8ef253aaff7af871429", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c9b1a3a25e73f1d6de1920ddb6705e52913d12017ebe8ef253aaff7af871429", kill_on_drop: false }`
[INFO] [stdout] 4c9b1a3a25e73f1d6de1920ddb6705e52913d12017ebe8ef253aaff7af871429
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57a760d494e8e42dbe43e57ef66dcd52a61ef8f57f0816c3a1c1e2caf267fc48
[INFO] running `Command { std: "docker" "start" "-a" "57a760d494e8e42dbe43e57ef66dcd52a61ef8f57f0816c3a1c1e2caf267fc48", kill_on_drop: false }`
[INFO] [stderr]     Checking slab v0.4.4
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]    Compiling futures-task v0.3.17
[INFO] [stderr]     Checking pin-project-lite v0.1.12
[INFO] [stderr]    Compiling httparse v1.5.1
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking futures-io v0.3.17
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stderr]    Compiling openssl-sys v0.9.66
[INFO] [stderr]     Checking tracing-core v0.1.20
[INFO] [stderr]     Checking http v0.2.4
[INFO] [stderr]     Checking encoding_rs v0.8.28
[INFO] [stderr]     Checking net2 v0.2.37
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking socket2 v0.3.19
[INFO] [stderr]    Compiling pin-project-internal v1.0.8
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]     Checking tracing v0.1.28
[INFO] [stderr]     Checking indexmap v1.7.0
[INFO] [stderr]     Checking tokio v0.2.25
[INFO] [stderr]    Compiling openssl v0.10.36
[INFO] [stderr]    Compiling native-tls v0.2.8
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking pin-project v1.0.8
[INFO] [stderr]     Checking tracing-futures v0.2.5
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking h2 v0.2.7
[INFO] [stderr]     Checking tokio-tls v0.3.1
[INFO] [stderr]     Checking hyper v0.13.10
[INFO] [stderr]     Checking serde_urlencoded v0.7.0
[INFO] [stderr]     Checking serde_json v1.0.68
[INFO] [stderr]     Checking hyper-tls v0.4.3
[INFO] [stderr]     Checking reqwest v0.10.10
[INFO] [stderr]     Checking es_balk v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:150:9
[INFO] [stdout]     |
[INFO] [stdout] 150 |         &self.items.push(item);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 150 |         let _ = &self.items.push(item);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:150:9
[INFO] [stdout]     |
[INFO] [stdout] 150 |         &self.items.push(item);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 150 |         let _ = &self.items.push(item);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.47s
[INFO] running `Command { std: "docker" "inspect" "57a760d494e8e42dbe43e57ef66dcd52a61ef8f57f0816c3a1c1e2caf267fc48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57a760d494e8e42dbe43e57ef66dcd52a61ef8f57f0816c3a1c1e2caf267fc48", kill_on_drop: false }`
[INFO] [stdout] 57a760d494e8e42dbe43e57ef66dcd52a61ef8f57f0816c3a1c1e2caf267fc48