[INFO] fetching crate flips 0.2.1...
[INFO] checking flips-0.2.1 against master#f167efad2f51088d86180ee89177b3d7c9e7c2f5 for pr-129543
[INFO] extracting crate flips 0.2.1 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate flips 0.2.1 on toolchain f167efad2f51088d86180ee89177b3d7c9e7c2f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flips 0.2.1
[INFO] finished tweaking crates.io crate flips 0.2.1
[INFO] tweaked toml for crates.io crate flips 0.2.1 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 18 packages to latest compatible versions
[INFO] [stderr]       Adding err-derive v0.2.4 (latest: v0.3.1)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.77)
[INFO] [stderr]       Adding synstructure v0.12.6 (latest: v0.13.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded flips-sys v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] be826d07f04d24d16ff3eddde0a5b080238f7de30ff1c40e5a4077cd437513a0
[INFO] running `Command { std: "docker" "start" "-a" "be826d07f04d24d16ff3eddde0a5b080238f7de30ff1c40e5a4077cd437513a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be826d07f04d24d16ff3eddde0a5b080238f7de30ff1c40e5a4077cd437513a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be826d07f04d24d16ff3eddde0a5b080238f7de30ff1c40e5a4077cd437513a0", kill_on_drop: false }`
[INFO] [stdout] be826d07f04d24d16ff3eddde0a5b080238f7de30ff1c40e5a4077cd437513a0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fc4b7b8e9e0c505e7bfb5c5d7cd1b196760d6959f65eb91f8e6bf0348c001372
[INFO] running `Command { std: "docker" "start" "-a" "fc4b7b8e9e0c505e7bfb5c5d7cd1b196760d6959f65eb91f8e6bf0348c001372", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling unicode-xid v0.2.5
[INFO] [stderr]     Checking crc32fast v1.4.2
[INFO] [stderr]    Compiling flips-sys v0.2.1
[INFO] [stderr]    Compiling err-derive v0.2.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking flips v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `metadata` is never read
[INFO] [stdout]   --> src/bps.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub struct BpsOutput {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 57 |     mem: FlipsMemory,
[INFO] [stdout] 58 |     metadata: Option<FlipsMemory>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BpsOutput` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `metadata` is never read
[INFO] [stdout]   --> src/bps.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub struct BpsOutput {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 57 |     mem: FlipsMemory,
[INFO] [stdout] 58 |     metadata: Option<FlipsMemory>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BpsOutput` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.19s
[INFO] running `Command { std: "docker" "inspect" "fc4b7b8e9e0c505e7bfb5c5d7cd1b196760d6959f65eb91f8e6bf0348c001372", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc4b7b8e9e0c505e7bfb5c5d7cd1b196760d6959f65eb91f8e6bf0348c001372", kill_on_drop: false }`
[INFO] [stdout] fc4b7b8e9e0c505e7bfb5c5d7cd1b196760d6959f65eb91f8e6bf0348c001372