[INFO] fetching crate flexiber 0.1.1...
[INFO] checking flexiber-0.1.1 against master#f167efad2f51088d86180ee89177b3d7c9e7c2f5 for pr-129543
[INFO] extracting crate flexiber 0.1.1 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate flexiber 0.1.1 on toolchain f167efad2f51088d86180ee89177b3d7c9e7c2f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flexiber 0.1.1
[INFO] finished tweaking crates.io crate flexiber 0.1.1
[INFO] tweaked toml for crates.io crate flexiber 0.1.1 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" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 23 packages to latest compatible versions
[INFO] [stderr]       Adding hash32 v0.2.1 (latest: v0.3.1)
[INFO] [stderr]       Adding heapless v0.7.17 (latest: v0.8.0)
[INFO] [stderr]       Adding hex-literal v0.3.4 (latest: v0.4.1)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.77)
[INFO] [stderr]       Adding synstructure v0.12.6 (latest: v0.13.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded flexiber_derive v0.1.0
[INFO] [stderr]   Downloaded delog v0.1.7
[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" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 73c765dc08f666319cd9ec20144afdb4d8e2b54d1e99078e22558ab11f6578d7
[INFO] running `Command { std: "docker" "start" "-a" "73c765dc08f666319cd9ec20144afdb4d8e2b54d1e99078e22558ab11f6578d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "73c765dc08f666319cd9ec20144afdb4d8e2b54d1e99078e22558ab11f6578d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73c765dc08f666319cd9ec20144afdb4d8e2b54d1e99078e22558ab11f6578d7", kill_on_drop: false }`
[INFO] [stdout] 73c765dc08f666319cd9ec20144afdb4d8e2b54d1e99078e22558ab11f6578d7
[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" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b76bb1c200e2cce3a9684a681aa0414429c3b34f843cdbb1b9d63876208dcc22
[INFO] running `Command { std: "docker" "start" "-a" "b76bb1c200e2cce3a9684a681aa0414429c3b34f843cdbb1b9d63876208dcc22", kill_on_drop: false }`
[INFO] [stderr]    Compiling delog v0.1.7
[INFO] [stderr]    Compiling hex-literal v0.3.4
[INFO] [stderr]     Checking flexiber v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait `Taggable` is never used
[INFO] [stdout]    --> src/traits.rs:162:18
[INFO] [stdout]     |
[INFO] [stdout] 162 | pub(crate) trait Taggable<T: TagLike>: Sized {
[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: struct `T3` is never constructed
[INFO] [stdout]    --> src/traits.rs:568:12
[INFO] [stdout]     |
[INFO] [stdout] 568 |     struct T3 {
[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 0.56s
[INFO] running `Command { std: "docker" "inspect" "b76bb1c200e2cce3a9684a681aa0414429c3b34f843cdbb1b9d63876208dcc22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b76bb1c200e2cce3a9684a681aa0414429c3b34f843cdbb1b9d63876208dcc22", kill_on_drop: false }`
[INFO] [stdout] b76bb1c200e2cce3a9684a681aa0414429c3b34f843cdbb1b9d63876208dcc22