[INFO] fetching crate rainbow-hat-rs 0.2.1...
[INFO] checking rainbow-hat-rs-0.2.1 against try#b1f2594eac607c1f051534800237eeedb5590a49 for pr-139493-3
[INFO] extracting crate rainbow-hat-rs 0.2.1 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate rainbow-hat-rs 0.2.1
[INFO] finished tweaking crates.io crate rainbow-hat-rs 0.2.1
[INFO] tweaked toml for crates.io crate rainbow-hat-rs 0.2.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rainbow-hat-rs 0.2.1 on toolchain b1f2594eac607c1f051534800237eeedb5590a49
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b1f2594eac607c1f051534800237eeedb5590a49" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rainbow-hat-rs 0.2.1 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" "+b1f2594eac607c1f051534800237eeedb5590a49" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+b1f2594eac607c1f051534800237eeedb5590a49" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0556c709eb936b721c2f50570b39d211df8fa8ab6a6fbe5dd2759b498f184add
[INFO] running `Command { std: "docker" "start" "-a" "0556c709eb936b721c2f50570b39d211df8fa8ab6a6fbe5dd2759b498f184add", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0556c709eb936b721c2f50570b39d211df8fa8ab6a6fbe5dd2759b498f184add", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0556c709eb936b721c2f50570b39d211df8fa8ab6a6fbe5dd2759b498f184add", kill_on_drop: false }`
[INFO] [stdout] 0556c709eb936b721c2f50570b39d211df8fa8ab6a6fbe5dd2759b498f184add
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+b1f2594eac607c1f051534800237eeedb5590a49" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb9f51c78e65390e2305615b488ca9679acdeffc7698ba1bdef7130d369c1796
[INFO] running `Command { std: "docker" "start" "-a" "eb9f51c78e65390e2305615b488ca9679acdeffc7698ba1bdef7130d369c1796", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]    Compiling ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling siphasher v0.3.3
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]     Checking phf_shared v0.9.0
[INFO] [stderr]    Compiling palette v0.6.0
[INFO] [stderr]     Checking rppal v0.12.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]     Checking approx v0.5.0
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]     Checking rainbow-hat-rs v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stdout] warning: field `brightness` is never read
[INFO] [stdout]   --> src/apa102.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct APA102 {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 42 |     brightness: u8,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `APA102` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling phf_generator v0.9.0
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling find-crate v0.6.3
[INFO] [stderr]    Compiling phf_macros v0.9.0
[INFO] [stderr]    Compiling palette_derive v0.6.0
[INFO] [stderr]     Checking phf v0.9.0
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 19.51s
[INFO] [stdout] warning: field `brightness` is never read
[INFO] [stdout]   --> src/apa102.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct APA102 {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 42 |     brightness: u8,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `APA102` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "eb9f51c78e65390e2305615b488ca9679acdeffc7698ba1bdef7130d369c1796", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb9f51c78e65390e2305615b488ca9679acdeffc7698ba1bdef7130d369c1796", kill_on_drop: false }`
[INFO] [stdout] eb9f51c78e65390e2305615b488ca9679acdeffc7698ba1bdef7130d369c1796