[INFO] fetching crate unionfind 0.2.1...
[INFO] checking unionfind-0.2.1 against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] extracting crate unionfind 0.2.1 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate unionfind 0.2.1 on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unionfind 0.2.1
[INFO] finished tweaking crates.io crate unionfind 0.2.1
[INFO] tweaked toml for crates.io crate unionfind 0.2.1 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 7 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24c45ac2f4e9c4414e6a9d39513628a1ad427dc70a67e552af7fb1456b4c4329
[INFO] running `Command { std: "docker" "start" "-a" "24c45ac2f4e9c4414e6a9d39513628a1ad427dc70a67e552af7fb1456b4c4329", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24c45ac2f4e9c4414e6a9d39513628a1ad427dc70a67e552af7fb1456b4c4329", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24c45ac2f4e9c4414e6a9d39513628a1ad427dc70a67e552af7fb1456b4c4329", kill_on_drop: false }`
[INFO] [stdout] 24c45ac2f4e9c4414e6a9d39513628a1ad427dc70a67e552af7fb1456b4c4329
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 312c100283d8b8b428f78121ee9b7d1e1992de736e8137bfd7c7a5645effb8c6
[INFO] running `Command { std: "docker" "start" "-a" "312c100283d8b8b428f78121ee9b7d1e1992de736e8137bfd7c7a5645effb8c6", kill_on_drop: false }`
[INFO] [stderr]     Checking unionfind v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `FixedSize` is never constructed
[INFO] [stdout]    --> src/mapping.rs:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 | struct FixedSize<M>(M);
[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 `FixedSize` is never constructed
[INFO] [stdout]    --> src/mapping.rs:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 | struct FixedSize<M>(M);
[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 0.43s
[INFO] running `Command { std: "docker" "inspect" "312c100283d8b8b428f78121ee9b7d1e1992de736e8137bfd7c7a5645effb8c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "312c100283d8b8b428f78121ee9b7d1e1992de736e8137bfd7c7a5645effb8c6", kill_on_drop: false }`
[INFO] [stdout] 312c100283d8b8b428f78121ee9b7d1e1992de736e8137bfd7c7a5645effb8c6
[INFO] checking unionfind-0.2.1 against try#6289438dbad80b1a0029c66dd3f6abf57c2c51be for pr-126452-1
[INFO] extracting crate unionfind 0.2.1 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate unionfind 0.2.1 on toolchain 6289438dbad80b1a0029c66dd3f6abf57c2c51be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unionfind 0.2.1
[INFO] finished tweaking crates.io crate unionfind 0.2.1
[INFO] tweaked toml for crates.io crate unionfind 0.2.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 7 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 497a278a18e721941b15be1245839001458db4925a062e2945b464de6da45cc7
[INFO] running `Command { std: "docker" "start" "-a" "497a278a18e721941b15be1245839001458db4925a062e2945b464de6da45cc7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "497a278a18e721941b15be1245839001458db4925a062e2945b464de6da45cc7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "497a278a18e721941b15be1245839001458db4925a062e2945b464de6da45cc7", kill_on_drop: false }`
[INFO] [stdout] 497a278a18e721941b15be1245839001458db4925a062e2945b464de6da45cc7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8463a967bec2c80df24e21ef4cc6465dd1b3bc647b381499ab5d60b5ef5c48ce
[INFO] running `Command { std: "docker" "start" "-a" "8463a967bec2c80df24e21ef4cc6465dd1b3bc647b381499ab5d60b5ef5c48ce", kill_on_drop: false }`
[INFO] [stderr]     Checking unionfind v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `FixedSize` is never constructed
[INFO] [stdout]    --> src/mapping.rs:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 | struct FixedSize<M>(M);
[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 `FixedSize` is never constructed
[INFO] [stdout]    --> src/mapping.rs:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 | struct FixedSize<M>(M);
[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 0.28s
[INFO] running `Command { std: "docker" "inspect" "8463a967bec2c80df24e21ef4cc6465dd1b3bc647b381499ab5d60b5ef5c48ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8463a967bec2c80df24e21ef4cc6465dd1b3bc647b381499ab5d60b5ef5c48ce", kill_on_drop: false }`
[INFO] [stdout] 8463a967bec2c80df24e21ef4cc6465dd1b3bc647b381499ab5d60b5ef5c48ce