[INFO] fetching crate serde-hessian 0.1.0-rc1...
[INFO] checking serde-hessian-0.1.0-rc1 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate serde-hessian 0.1.0-rc1 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate serde-hessian 0.1.0-rc1 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serde-hessian 0.1.0-rc1
[INFO] finished tweaking crates.io crate serde-hessian 0.1.0-rc1
[INFO] tweaked toml for crates.io crate serde-hessian 0.1.0-rc1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 14 packages to latest compatible versions
[INFO] [stderr]       Adding hashbrown v0.12.3 (latest: v0.14.5)
[INFO] [stderr]       Adding indexmap v1.9.3 (latest: v2.5.0)
[INFO] [stderr]       Adding ordered-float v1.1.1 (latest: v4.2.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hessian_rs v0.0.4-rc3
[INFO] [stderr]   Downloaded ordered-float v1.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 81a27bbb76ea6622543d8d1265707d0652e16522e448730c4e72417f17ad68c3
[INFO] running `Command { std: "docker" "start" "-a" "81a27bbb76ea6622543d8d1265707d0652e16522e448730c4e72417f17ad68c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "81a27bbb76ea6622543d8d1265707d0652e16522e448730c4e72417f17ad68c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81a27bbb76ea6622543d8d1265707d0652e16522e448730c4e72417f17ad68c3", kill_on_drop: false }`
[INFO] [stdout] 81a27bbb76ea6622543d8d1265707d0652e16522e448730c4e72417f17ad68c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 92b5c9db5464ac181964bc8253515e8bed19a52144e629d725cfc3c12a2ce2dc
[INFO] running `Command { std: "docker" "start" "-a" "92b5c9db5464ac181964bc8253515e8bed19a52144e629d725cfc3c12a2ce2dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking hashbrown v0.12.3
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]     Checking ordered-float v1.1.1
[INFO] [stderr]     Checking hessian_rs v0.0.4-rc3
[INFO] [stderr]     Checking serde-hessian v0.1.0-rc1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]   --> src/ser.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct MapSerializer<'a, W: io::Write> {
[INFO] [stdout]    |            ------------- field in this struct
[INFO] [stdout] 26 |     name: Option<&'static str>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[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 `name` is never read
[INFO] [stdout]   --> src/ser.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct MapSerializer<'a, W: io::Write> {
[INFO] [stdout]    |            ------------- field in this struct
[INFO] [stdout] 26 |     name: Option<&'static str>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[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 3.20s
[INFO] running `Command { std: "docker" "inspect" "92b5c9db5464ac181964bc8253515e8bed19a52144e629d725cfc3c12a2ce2dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92b5c9db5464ac181964bc8253515e8bed19a52144e629d725cfc3c12a2ce2dc", kill_on_drop: false }`
[INFO] [stdout] 92b5c9db5464ac181964bc8253515e8bed19a52144e629d725cfc3c12a2ce2dc