[INFO] cloning repository https://github.com/kzhang425/mregex_counter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kzhang425/mregex_counter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkzhang425%2Fmregex_counter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkzhang425%2Fmregex_counter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fbd54049562462b195b892792bc5e03a63ce6964
[INFO] testing kzhang425/mregex_counter against 1.90.0 for beta-1.91-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkzhang425%2Fmregex_counter" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kzhang425/mregex_counter
[INFO] finished tweaking git repo https://github.com/kzhang425/mregex_counter
[INFO] tweaked toml for git repo https://github.com/kzhang425/mregex_counter written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kzhang425/mregex_counter on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kzhang425/mregex_counter 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 38c5dcfe3365f3efbd60f6546940de42dcfc92e1b3582980f1608bded3df0c41
[INFO] running `Command { std: "docker" "start" "-a" "38c5dcfe3365f3efbd60f6546940de42dcfc92e1b3582980f1608bded3df0c41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "38c5dcfe3365f3efbd60f6546940de42dcfc92e1b3582980f1608bded3df0c41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38c5dcfe3365f3efbd60f6546940de42dcfc92e1b3582980f1608bded3df0c41", kill_on_drop: false }`
[INFO] [stdout] 38c5dcfe3365f3efbd60f6546940de42dcfc92e1b3582980f1608bded3df0c41
[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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6e309f9b53ac676ca70af1f7402723b98c6989df6d999ac982283a587fbb5f18
[INFO] running `Command { std: "docker" "start" "-a" "6e309f9b53ac676ca70af1f7402723b98c6989df6d999ac982283a587fbb5f18", kill_on_drop: false }`
[INFO] [stderr]    Compiling mregex_counter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `default_engine` is never used
[INFO] [stdout]   --> src/regex/builder.rs:86:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Builder {
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 86 |     fn default_engine(input_string: String) -> Engine {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     engine.process();
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let _ = engine.process();
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.75s
[INFO] running `Command { std: "docker" "inspect" "6e309f9b53ac676ca70af1f7402723b98c6989df6d999ac982283a587fbb5f18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e309f9b53ac676ca70af1f7402723b98c6989df6d999ac982283a587fbb5f18", kill_on_drop: false }`
[INFO] [stdout] 6e309f9b53ac676ca70af1f7402723b98c6989df6d999ac982283a587fbb5f18
[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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57abbb26e2c246af5ca94581953f34b69b6070da1aabfdfbd662f205e8606c04
[INFO] running `Command { std: "docker" "start" "-a" "57abbb26e2c246af5ca94581953f34b69b6070da1aabfdfbd662f205e8606c04", kill_on_drop: false }`
[INFO] [stderr]    Compiling mregex_counter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `default_engine` is never used
[INFO] [stdout]   --> src/regex/builder.rs:86:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Builder {
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 86 |     fn default_engine(input_string: String) -> Engine {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     engine.process();
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let _ = engine.process();
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `default_engine` is never used
[INFO] [stdout]   --> src/regex/builder.rs:86:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Builder {
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 86 |     fn default_engine(input_string: String) -> Engine {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "57abbb26e2c246af5ca94581953f34b69b6070da1aabfdfbd662f205e8606c04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57abbb26e2c246af5ca94581953f34b69b6070da1aabfdfbd662f205e8606c04", kill_on_drop: false }`
[INFO] [stdout] 57abbb26e2c246af5ca94581953f34b69b6070da1aabfdfbd662f205e8606c04
[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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 14e4ae6b9727319ae7aa85c1a91d3f2bb22943574fed33dc304f1cbcc03189c5
[INFO] running `Command { std: "docker" "start" "-a" "14e4ae6b9727319ae7aa85c1a91d3f2bb22943574fed33dc304f1cbcc03189c5", kill_on_drop: false }`
[INFO] [stderr] warning: associated function `default_engine` is never used
[INFO] [stderr]   --> src/regex/builder.rs:86:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | impl Builder {
[INFO] [stderr]    | ------------ associated function in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 86 |     fn default_engine(input_string: String) -> Engine {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `mregex_counter` (lib) generated 1 warning
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     engine.process();
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let _ = engine.process();
[INFO] [stderr]   |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `mregex_counter` (bin "mregex_counter" test) generated 1 warning
[INFO] [stderr] warning: `mregex_counter` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/mregex_counter-2aae8f67567b931f)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test regex::engine::tests::simple_tests ... ok
[INFO] [stdout] test regex::engine::tests::more_complex ... ok
[INFO] [stdout] test regex::rule::tests::check_block ... ok
[INFO] [stdout] test regex::engine::tests::test_coalesce_functionality ... ok
[INFO] [stdout] test regex::builder::tests::test_output ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 11.81s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/mregex_counter-763057f349ebe791)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]    Doc-tests mregex_counter
[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] [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" "14e4ae6b9727319ae7aa85c1a91d3f2bb22943574fed33dc304f1cbcc03189c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14e4ae6b9727319ae7aa85c1a91d3f2bb22943574fed33dc304f1cbcc03189c5", kill_on_drop: false }`
[INFO] [stdout] 14e4ae6b9727319ae7aa85c1a91d3f2bb22943574fed33dc304f1cbcc03189c5