[INFO] fetching crate serde_krds 0.1.1...
[INFO] checking serde_krds-0.1.1 against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] extracting crate serde_krds 0.1.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate serde_krds 0.1.1 on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serde_krds 0.1.1
[INFO] finished tweaking crates.io crate serde_krds 0.1.1
[INFO] tweaked toml for crates.io crate serde_krds 0.1.1 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 11 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded kindle_formats v0.1.3
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 72f80abb59181770261ba871492154251d21902536eff8fbaa7d4e471ff4c41a
[INFO] running `Command { std: "docker" "start" "-a" "72f80abb59181770261ba871492154251d21902536eff8fbaa7d4e471ff4c41a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "72f80abb59181770261ba871492154251d21902536eff8fbaa7d4e471ff4c41a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72f80abb59181770261ba871492154251d21902536eff8fbaa7d4e471ff4c41a", kill_on_drop: false }`
[INFO] [stdout] 72f80abb59181770261ba871492154251d21902536eff8fbaa7d4e471ff4c41a
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 92aba52ef922d2356251713e1a0f750a1c2ab434d08e2f03e7e55eaca2ad55f1
[INFO] running `Command { std: "docker" "start" "-a" "92aba52ef922d2356251713e1a0f750a1c2ab434d08e2f03e7e55eaca2ad55f1", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.3.0
[INFO] [stderr]     Checking linked-hash-map v0.5.6
[INFO] [stderr]     Checking serde_krds v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `MapKeySerializer` is never constructed
[INFO] [stdout]    --> src/ser.rs:366:8
[INFO] [stdout]     |
[INFO] [stdout] 366 | struct MapKeySerializer;
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bad_key_err` is never used
[INFO] [stdout]    --> src/ser.rs:368:4
[INFO] [stdout]     |
[INFO] [stdout] 368 | fn bad_key_err() -> Error {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking kindle_formats v0.1.3
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stdout] warning: struct `MapKeySerializer` is never constructed
[INFO] [stdout]    --> src/ser.rs:366:8
[INFO] [stdout]     |
[INFO] [stdout] 366 | struct MapKeySerializer;
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bad_key_err` is never used
[INFO] [stdout]    --> src/ser.rs:368:4
[INFO] [stdout]     |
[INFO] [stdout] 368 | fn bad_key_err() -> Error {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.32s
[INFO] running `Command { std: "docker" "inspect" "92aba52ef922d2356251713e1a0f750a1c2ab434d08e2f03e7e55eaca2ad55f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92aba52ef922d2356251713e1a0f750a1c2ab434d08e2f03e7e55eaca2ad55f1", kill_on_drop: false }`
[INFO] [stdout] 92aba52ef922d2356251713e1a0f750a1c2ab434d08e2f03e7e55eaca2ad55f1