[INFO] fetching crate heckcheck 2.0.1...
[INFO] checking heckcheck-2.0.1 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate heckcheck 2.0.1 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate heckcheck 2.0.1
[INFO] finished tweaking crates.io crate heckcheck 2.0.1
[INFO] tweaked toml for crates.io crate heckcheck 2.0.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate heckcheck 2.0.1 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 17 packages to latest compatible versions
[INFO] [stderr]       Adding base64 v0.13.1 (available: v0.22.1)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 388c45a17eab701d4bf6da412dd40a7c39c3587c5037dd4f3fcb018176c037bb
[INFO] running `Command { std: "docker" "start" "-a" "388c45a17eab701d4bf6da412dd40a7c39c3587c5037dd4f3fcb018176c037bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "388c45a17eab701d4bf6da412dd40a7c39c3587c5037dd4f3fcb018176c037bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "388c45a17eab701d4bf6da412dd40a7c39c3587c5037dd4f3fcb018176c037bb", kill_on_drop: false }`
[INFO] [stdout] 388c45a17eab701d4bf6da412dd40a7c39c3587c5037dd4f3fcb018176c037bb
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a65cc129a919dfe7866ced700ef989ebbd6b75bf52920de7de9e300993cb04fd
[INFO] running `Command { std: "docker" "start" "-a" "a65cc129a919dfe7866ced700ef989ebbd6b75bf52920de7de9e300993cb04fd", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]     Checking base64 v0.13.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]     Checking getrandom v0.2.16
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling derive_arbitrary v1.4.1
[INFO] [stderr]     Checking arbitrary v1.4.1
[INFO] [stderr]     Checking heckcheck v2.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `ZeroShrinker` is never constructed
[INFO] [stdout]   --> src/shrinker.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct ZeroShrinker {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `find_next_index_to_zeroify` is never used
[INFO] [stdout]   --> src/shrinker.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl ZeroShrinker {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 45 |     /// Find the next index to alter, skipping indices that already contain zeroes.
[INFO] [stdout] 46 |     fn find_next_index_to_zeroify(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ZeroShrinker` is never constructed
[INFO] [stdout]   --> src/shrinker.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct ZeroShrinker {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `find_next_index_to_zeroify` is never used
[INFO] [stdout]   --> src/shrinker.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl ZeroShrinker {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 45 |     /// Find the next index to alter, skipping indices that already contain zeroes.
[INFO] [stdout] 46 |     fn find_next_index_to_zeroify(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.89s
[INFO] running `Command { std: "docker" "inspect" "a65cc129a919dfe7866ced700ef989ebbd6b75bf52920de7de9e300993cb04fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a65cc129a919dfe7866ced700ef989ebbd6b75bf52920de7de9e300993cb04fd", kill_on_drop: false }`
[INFO] [stdout] a65cc129a919dfe7866ced700ef989ebbd6b75bf52920de7de9e300993cb04fd