[INFO] fetching crate sleuth 0.2.1...
[INFO] testing sleuth-0.2.1 against master#caccb4d0368bd918ef6668af8e13834d07040417 for pr-146098-1
[INFO] extracting crate sleuth 0.2.1 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate sleuth 0.2.1
[INFO] finished tweaking crates.io crate sleuth 0.2.1
[INFO] tweaked toml for crates.io crate sleuth 0.2.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate sleuth 0.2.1 on toolchain caccb4d0368bd918ef6668af8e13834d07040417
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "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" "+caccb4d0368bd918ef6668af8e13834d07040417" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 18 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sleuth-mutator v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2b1862bbf725b1d8c525b47ffd881ca180ae9fb45388899449c306c42030de9b
[INFO] running `Command { std: "docker" "start" "-a" "2b1862bbf725b1d8c525b47ffd881ca180ae9fb45388899449c306c42030de9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b1862bbf725b1d8c525b47ffd881ca180ae9fb45388899449c306c42030de9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b1862bbf725b1d8c525b47ffd881ca180ae9fb45388899449c306c42030de9b", kill_on_drop: false }`
[INFO] [stdout] 2b1862bbf725b1d8c525b47ffd881ca180ae9fb45388899449c306c42030de9b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a9c5d4cb92ce8ec011a882f5f3ad115ca3197a2a290397930d323b2d03dcbc86
[INFO] running `Command { std: "docker" "start" "-a" "a9c5d4cb92ce8ec011a882f5f3ad115ca3197a2a290397930d323b2d03dcbc86", kill_on_drop: false }`
[INFO] [stderr]    Compiling prettyplease v0.2.37
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling sleuth-mutator v0.2.1
[INFO] [stderr]    Compiling sleuth v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: unused imports: `timid_assert_false` and `timid_assert`
[INFO] [stdout]   --> src/util.rs:44:10
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub use {timid_assert, timid_assert_false};
[INFO] [stdout]    |          ^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 | #![deny(warnings)]
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    = note: `#[deny(unused_imports)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sleuth` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "a9c5d4cb92ce8ec011a882f5f3ad115ca3197a2a290397930d323b2d03dcbc86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9c5d4cb92ce8ec011a882f5f3ad115ca3197a2a290397930d323b2d03dcbc86", kill_on_drop: false }`
[INFO] [stdout] a9c5d4cb92ce8ec011a882f5f3ad115ca3197a2a290397930d323b2d03dcbc86