[INFO] cloning repository https://github.com/Bravo555/category-theory-for-programmers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Bravo555/category-theory-for-programmers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBravo555%2Fcategory-theory-for-programmers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBravo555%2Fcategory-theory-for-programmers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 76332543a5ef9b6acf5d5991f5c387a682aa2840
[INFO] testing Bravo555/category-theory-for-programmers against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBravo555%2Fcategory-theory-for-programmers" "/workspace/builds/worker-26/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-26/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Bravo555/category-theory-for-programmers on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Bravo555/category-theory-for-programmers
[INFO] finished tweaking git repo https://github.com/Bravo555/category-theory-for-programmers
[INFO] tweaked toml for git repo https://github.com/Bravo555/category-theory-for-programmers written to /workspace/builds/worker-26/source/Cargo.toml
[INFO] crate git repo https://github.com/Bravo555/category-theory-for-programmers already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9506d1a527489760807ca462f8fef27d107992098dbd1d84b963e4b2cb9ec0bd
[INFO] running `Command { std: "docker" "start" "-a" "9506d1a527489760807ca462f8fef27d107992098dbd1d84b963e4b2cb9ec0bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9506d1a527489760807ca462f8fef27d107992098dbd1d84b963e4b2cb9ec0bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9506d1a527489760807ca462f8fef27d107992098dbd1d84b963e4b2cb9ec0bd", kill_on_drop: false }`
[INFO] [stdout] 9506d1a527489760807ca462f8fef27d107992098dbd1d84b963e4b2cb9ec0bd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb0efe219a46fa24e20ccdb9a5c4a6643b6380f06e4d2b464ea29ec79eb20727
[INFO] running `Command { std: "docker" "start" "-a" "eb0efe219a46fa24e20ccdb9a5c4a6643b6380f06e4d2b464ea29ec79eb20727", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.85
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling rand_core v0.6.1
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling excercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `ret`
[INFO] [stdout]  --> src/bin/ch4.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn ret<A>(a: A) -> Optional<A> {
[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 [unoptimized + debuginfo] target(s) in 8.24s
[INFO] running `Command { std: "docker" "inspect" "eb0efe219a46fa24e20ccdb9a5c4a6643b6380f06e4d2b464ea29ec79eb20727", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb0efe219a46fa24e20ccdb9a5c4a6643b6380f06e4d2b464ea29ec79eb20727", kill_on_drop: false }`
[INFO] [stdout] eb0efe219a46fa24e20ccdb9a5c4a6643b6380f06e4d2b464ea29ec79eb20727
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7a2c8aedeaa6649611256568d9cc92501b3c0fb43faec146d34dee982b93fc26
[INFO] running `Command { std: "docker" "start" "-a" "7a2c8aedeaa6649611256568d9cc92501b3c0fb43faec146d34dee982b93fc26", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling excercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `ret`
[INFO] [stdout]  --> src/bin/ch4.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn ret<A>(a: A) -> Optional<A> {
[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 test [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "7a2c8aedeaa6649611256568d9cc92501b3c0fb43faec146d34dee982b93fc26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a2c8aedeaa6649611256568d9cc92501b3c0fb43faec146d34dee982b93fc26", kill_on_drop: false }`
[INFO] [stdout] 7a2c8aedeaa6649611256568d9cc92501b3c0fb43faec146d34dee982b93fc26
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d146f3ce62ec3d014445b7b88d4c2f67c3ee381e676d95bcd71a801a62d8c1b8
[INFO] running `Command { std: "docker" "start" "-a" "d146f3ce62ec3d014445b7b88d4c2f67c3ee381e676d95bcd71a801a62d8c1b8", kill_on_drop: false }`
[INFO] [stderr] warning: function is never used: `ret`
[INFO] [stderr]  --> src/bin/ch4.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn ret<A>(a: A) -> Optional<A> {
[INFO] [stderr]   |    ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `excercises` (bin "ch4" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.18s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/ch1-fcb804ec027b3f63)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/ch2-2ac14fae659da0e5)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/ch4-80b5f9a71fe731f3)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d146f3ce62ec3d014445b7b88d4c2f67c3ee381e676d95bcd71a801a62d8c1b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d146f3ce62ec3d014445b7b88d4c2f67c3ee381e676d95bcd71a801a62d8c1b8", kill_on_drop: false }`
[INFO] [stdout] d146f3ce62ec3d014445b7b88d4c2f67c3ee381e676d95bcd71a801a62d8c1b8