[INFO] fetching crate pngcheck 0.1.1...
[INFO] testing pngcheck-0.1.1 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] extracting crate pngcheck 0.1.1 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate pngcheck 0.1.1
[INFO] finished tweaking crates.io crate pngcheck 0.1.1
[INFO] tweaked toml for crates.io crate pngcheck 0.1.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate pngcheck 0.1.1 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate pngcheck 0.1.1 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" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cf97850b6ef90617c92803e6952ef58ce2ad825df4aff8a7ef77a745397d52a5
[INFO] running `Command { std: "docker" "start" "-a" "cf97850b6ef90617c92803e6952ef58ce2ad825df4aff8a7ef77a745397d52a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cf97850b6ef90617c92803e6952ef58ce2ad825df4aff8a7ef77a745397d52a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf97850b6ef90617c92803e6952ef58ce2ad825df4aff8a7ef77a745397d52a5", kill_on_drop: false }`
[INFO] [stdout] cf97850b6ef90617c92803e6952ef58ce2ad825df4aff8a7ef77a745397d52a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e440d67ee0c141e052eb0cc5ee171926c5256a473dbb21d4f50a5697039a0093
[INFO] running `Command { std: "docker" "start" "-a" "e440d67ee0c141e052eb0cc5ee171926c5256a473dbb21d4f50a5697039a0093", kill_on_drop: false }`
[INFO] [stderr]    Compiling pngcheck v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `global_max_error` is never read
[INFO] [stdout]     --> src/main.rs:1106:13
[INFO] [stdout]      |
[INFO] [stdout] 1106 |             global_max_error = global_max_error.max(err);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout]      = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.75s
[INFO] running `Command { std: "docker" "inspect" "e440d67ee0c141e052eb0cc5ee171926c5256a473dbb21d4f50a5697039a0093", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e440d67ee0c141e052eb0cc5ee171926c5256a473dbb21d4f50a5697039a0093", kill_on_drop: false }`
[INFO] [stdout] e440d67ee0c141e052eb0cc5ee171926c5256a473dbb21d4f50a5697039a0093
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 68ba5fb800e25a75e9bb7de93829a1ea7034d8766fe5f828f3fa8b4901513836
[INFO] running `Command { std: "docker" "start" "-a" "68ba5fb800e25a75e9bb7de93829a1ea7034d8766fe5f828f3fa8b4901513836", kill_on_drop: false }`
[INFO] [stderr]    Compiling pngcheck v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `global_max_error` is never read
[INFO] [stdout]     --> src/main.rs:1106:13
[INFO] [stdout]      |
[INFO] [stdout] 1106 |             global_max_error = global_max_error.max(err);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout]      = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "68ba5fb800e25a75e9bb7de93829a1ea7034d8766fe5f828f3fa8b4901513836", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68ba5fb800e25a75e9bb7de93829a1ea7034d8766fe5f828f3fa8b4901513836", kill_on_drop: false }`
[INFO] [stdout] 68ba5fb800e25a75e9bb7de93829a1ea7034d8766fe5f828f3fa8b4901513836
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f2085bf1141867fa06813f1ec1caf7c75f5b70397a79e5bde485dbb841254dfe
[INFO] running `Command { std: "docker" "start" "-a" "f2085bf1141867fa06813f1ec1caf7c75f5b70397a79e5bde485dbb841254dfe", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `global_max_error` is never read
[INFO] [stdout] 
[INFO] [stderr]     --> src/main.rs:1106:13
[INFO] [stdout] running 0 tests
[INFO] [stderr]      |
[INFO] [stdout] 
[INFO] [stderr] 1106 |             global_max_error = global_max_error.max(err);
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stderr]      |
[INFO] [stderr]      = help: maybe it is overwritten before being read?
[INFO] [stderr]      = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `pngcheck` (bin "pngcheck" test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/pngcheck-2aa5a4f532c41a5f)
[INFO] running `Command { std: "docker" "inspect" "f2085bf1141867fa06813f1ec1caf7c75f5b70397a79e5bde485dbb841254dfe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2085bf1141867fa06813f1ec1caf7c75f5b70397a79e5bde485dbb841254dfe", kill_on_drop: false }`
[INFO] [stdout] f2085bf1141867fa06813f1ec1caf7c75f5b70397a79e5bde485dbb841254dfe