[INFO] fetching crate optbuilder 0.1.2...
[INFO] checking optbuilder-0.1.2 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate optbuilder 0.1.2 into /workspace/builds/worker-47/source
[INFO] validating manifest of crates.io crate optbuilder 0.1.2 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate optbuilder 0.1.2
[INFO] finished tweaking crates.io crate optbuilder 0.1.2
[INFO] tweaked toml for crates.io crate optbuilder 0.1.2 written to /workspace/builds/worker-47/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-47/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-47/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b98bd42157a9c2fbe00483704ce48fc9385d0e7594018fd553aac60eb859d84c
[INFO] running `Command { std: "docker" "start" "-a" "b98bd42157a9c2fbe00483704ce48fc9385d0e7594018fd553aac60eb859d84c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b98bd42157a9c2fbe00483704ce48fc9385d0e7594018fd553aac60eb859d84c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b98bd42157a9c2fbe00483704ce48fc9385d0e7594018fd553aac60eb859d84c", kill_on_drop: false }`
[INFO] [stdout] b98bd42157a9c2fbe00483704ce48fc9385d0e7594018fd553aac60eb859d84c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-47/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-47/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d30ad70ec45e47e896d026d0be8ab3ba2daf4b83a03f48e8fd9780f3cd8afae5
[INFO] running `Command { std: "docker" "start" "-a" "d30ad70ec45e47e896d026d0be8ab3ba2daf4b83a03f48e8fd9780f3cd8afae5", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]     Checking unicode-xid v0.2.2
[INFO] [stderr]     Checking quote v1.0.10
[INFO] [stderr]     Checking syn v1.0.82
[INFO] [stderr]     Checking optbuilder v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `a`
[INFO] [stdout]   --> tests/lib.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |             pub a: i32,
[INFO] [stdout]    |             ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `c`
[INFO] [stdout]   --> tests/lib.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             pub c: Option<i32>,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `a`
[INFO] [stdout]   --> tests/lib.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |             pub a: i32,
[INFO] [stdout]    |             ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `b`
[INFO] [stdout]   --> tests/lib.rs:36:13
[INFO] [stdout]    |
[INFO] [stdout] 36 |             pub b: Option<i32>,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `c`
[INFO] [stdout]   --> tests/lib.rs:38:13
[INFO] [stdout]    |
[INFO] [stdout] 38 |             pub c: Option<i32>,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `f`
[INFO] [stdout]   --> tests/lib.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             pub f: Option<f32>,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.27s
[INFO] running `Command { std: "docker" "inspect" "d30ad70ec45e47e896d026d0be8ab3ba2daf4b83a03f48e8fd9780f3cd8afae5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d30ad70ec45e47e896d026d0be8ab3ba2daf4b83a03f48e8fd9780f3cd8afae5", kill_on_drop: false }`
[INFO] [stdout] d30ad70ec45e47e896d026d0be8ab3ba2daf4b83a03f48e8fd9780f3cd8afae5