[INFO] fetching crate optarg2chain 0.1.0...
[INFO] checking optarg2chain-0.1.0 against master#96df4943409564a187894018f15f795426dc2e1f for pr-118968
[INFO] extracting crate optarg2chain 0.1.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate optarg2chain 0.1.0 on toolchain 96df4943409564a187894018f15f795426dc2e1f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+96df4943409564a187894018f15f795426dc2e1f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate optarg2chain 0.1.0
[INFO] finished tweaking crates.io crate optarg2chain 0.1.0
[INFO] tweaked toml for crates.io crate optarg2chain 0.1.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate optarg2chain 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+96df4943409564a187894018f15f795426dc2e1f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+96df4943409564a187894018f15f795426dc2e1f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07e2b186d431458974126f7f74da127b30cb4075447b53ea637f31de18122c05
[INFO] running `Command { std: "docker" "start" "-a" "07e2b186d431458974126f7f74da127b30cb4075447b53ea637f31de18122c05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07e2b186d431458974126f7f74da127b30cb4075447b53ea637f31de18122c05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07e2b186d431458974126f7f74da127b30cb4075447b53ea637f31de18122c05", kill_on_drop: false }`
[INFO] [stdout] 07e2b186d431458974126f7f74da127b30cb4075447b53ea637f31de18122c05
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+96df4943409564a187894018f15f795426dc2e1f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ba5c6d4384b6c9b0cb80ee1514b48f1fc0fbdfd306d7a0e3702656ace65d0696
[INFO] running `Command { std: "docker" "start" "-a" "ba5c6d4384b6c9b0cb80ee1514b48f1fc0fbdfd306d7a0e3702656ace65d0696", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]    Compiling memchr v2.3.2
[INFO] [stderr]     Checking futures-core v0.3.4
[INFO] [stderr]     Checking futures-sink v0.3.4
[INFO] [stderr]     Checking futures-io v0.3.4
[INFO] [stderr]     Checking futures-task v0.3.4
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking quote v1.0.2
[INFO] [stderr]     Checking optarg2chain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stdout] warning: fields `hostname`, `port`, `service_name`, and `enabled` are never read
[INFO] [stdout]  --> examples/builder.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     pub struct Server {
[INFO] [stdout]   |                ------ fields in this struct
[INFO] [stdout] 6 |         hostname: String,
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout] 7 |         port: u16,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout] 8 |         service_name: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 9 |         enabled: bool,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Server` 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 [unoptimized + debuginfo] target(s) in 6.27s
[INFO] running `Command { std: "docker" "inspect" "ba5c6d4384b6c9b0cb80ee1514b48f1fc0fbdfd306d7a0e3702656ace65d0696", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba5c6d4384b6c9b0cb80ee1514b48f1fc0fbdfd306d7a0e3702656ace65d0696", kill_on_drop: false }`
[INFO] [stdout] ba5c6d4384b6c9b0cb80ee1514b48f1fc0fbdfd306d7a0e3702656ace65d0696
[ERROR] this task or one of its parent failed!
[ERROR] error sending request for url (https://crater.rust-lang.org/agent-api/record-progress): connection closed before message completed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.