[INFO] fetching crate idx-rs 0.10.0...
[INFO] checking idx-rs-0.10.0 against master#39cb3386ddc6c71657418be28dbb3987eea4aa4b for pr-133536
[INFO] extracting crate idx-rs 0.10.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate idx-rs 0.10.0 on toolchain 39cb3386ddc6c71657418be28dbb3987eea4aa4b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate idx-rs 0.10.0
[INFO] finished tweaking crates.io crate idx-rs 0.10.0
[INFO] tweaked toml for crates.io crate idx-rs 0.10.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 97 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.3.6 (available: v0.5.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded databuffer v1.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9c950fc2714682b56b34fdd9367505cb907bb022d03f16b299816d53ad5fa0d1
[INFO] running `Command { std: "docker" "start" "-a" "9c950fc2714682b56b34fdd9367505cb907bb022d03f16b299816d53ad5fa0d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c950fc2714682b56b34fdd9367505cb907bb022d03f16b299816d53ad5fa0d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c950fc2714682b56b34fdd9367505cb907bb022d03f16b299816d53ad5fa0d1", kill_on_drop: false }`
[INFO] [stdout] 9c950fc2714682b56b34fdd9367505cb907bb022d03f16b299816d53ad5fa0d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ebe9dcc74044a628c7ccd0e55143d974ee71036f52bab507a84f0487b5eb8a9c
[INFO] running `Command { std: "docker" "start" "-a" "ebe9dcc74044a628c7ccd0e55143d974ee71036f52bab507a84f0487b5eb8a9c", kill_on_drop: false }`
[INFO] [stderr]     Checking plotters-backend v0.3.7
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]    Compiling bzip2-sys v0.1.11+1.0.8
[INFO] [stderr]     Checking half v1.8.3
[INFO] [stderr]     Checking cast v0.3.0
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking databuffer v1.1.4
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking oorandom v11.1.4
[INFO] [stderr]     Checking inflate v0.4.5
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking plotters-svg v0.3.7
[INFO] [stderr]     Checking plotters v0.3.7
[INFO] [stderr]     Checking zerocopy v0.7.35
[INFO] [stderr]     Checking bzip2 v0.4.4
[INFO] [stderr]     Checking idx-rs v0.10.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking ppv-lite86 v0.2.20
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> tests/lib.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let _ = CACHE.lock();
[INFO] [stdout]    |         ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(let_underscore_lock)]` on by default
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let _unused = CACHE.lock();
[INFO] [stdout]    |         ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 14 |     drop(CACHE.lock());
[INFO] [stdout]    |     ~~~~~            +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `idx-rs` (test "lib") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ebe9dcc74044a628c7ccd0e55143d974ee71036f52bab507a84f0487b5eb8a9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ebe9dcc74044a628c7ccd0e55143d974ee71036f52bab507a84f0487b5eb8a9c", kill_on_drop: false }`
[INFO] [stdout] ebe9dcc74044a628c7ccd0e55143d974ee71036f52bab507a84f0487b5eb8a9c
