[INFO] cloning repository https://github.com/agoodstart/intro-to-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/agoodstart/intro-to-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagoodstart%2Fintro-to-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagoodstart%2Fintro-to-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 45542451ece434e48ca265358f49f298d6614c7a
[INFO] testing agoodstart/intro-to-rust against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagoodstart%2Fintro-to-rust" "/workspace/builds/worker-99/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-99/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/agoodstart/intro-to-rust on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/agoodstart/intro-to-rust
[INFO] finished tweaking git repo https://github.com/agoodstart/intro-to-rust
[INFO] tweaked toml for git repo https://github.com/agoodstart/intro-to-rust written to /workspace/builds/worker-99/source/Cargo.toml
[INFO] crate git repo https://github.com/agoodstart/intro-to-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1fd72a9a3edae071f3769473231f690f7c232f6e1e5267fbee4bd6c10dc25d21
[INFO] running `Command { std: "docker" "start" "-a" "1fd72a9a3edae071f3769473231f690f7c232f6e1e5267fbee4bd6c10dc25d21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1fd72a9a3edae071f3769473231f690f7c232f6e1e5267fbee4bd6c10dc25d21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fd72a9a3edae071f3769473231f690f7c232f6e1e5267fbee4bd6c10dc25d21", kill_on_drop: false }`
[INFO] [stdout] 1fd72a9a3edae071f3769473231f690f7c232f6e1e5267fbee4bd6c10dc25d21
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6940c8ed5fa9ff9cde5e3fce3d6c10c9f9ea072bf73b87b9e7a2280320f12bd6
[INFO] running `Command { std: "docker" "start" "-a" "6940c8ed5fa9ff9cde5e3fce3d6c10c9f9ea072bf73b87b9e7a2280320f12bd6", kill_on_drop: false }`
[INFO] [stderr]    Compiling intro-to-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> src/error_handling_part_two.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let f = File::open("hello.txt")?;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/error_handling_part_two.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `short_func`
[INFO] [stdout]   --> src/error_handling_part_two.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn short_func() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `even_shorter`
[INFO] [stdout]   --> src/error_handling_part_two.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn even_shorter() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shortest`
[INFO] [stdout]   --> src/error_handling_part_two.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn shortest() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 |     error_handling_part_two::run();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.57s
[INFO] running `Command { std: "docker" "inspect" "6940c8ed5fa9ff9cde5e3fce3d6c10c9f9ea072bf73b87b9e7a2280320f12bd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6940c8ed5fa9ff9cde5e3fce3d6c10c9f9ea072bf73b87b9e7a2280320f12bd6", kill_on_drop: false }`
[INFO] [stdout] 6940c8ed5fa9ff9cde5e3fce3d6c10c9f9ea072bf73b87b9e7a2280320f12bd6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bee630f9a1412d8410c0b7307c1a1ca89ecadee608d9f7858aed9f0d8cdb9f37
[INFO] running `Command { std: "docker" "start" "-a" "bee630f9a1412d8410c0b7307c1a1ca89ecadee608d9f7858aed9f0d8cdb9f37", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling intro-to-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> src/error_handling_part_two.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let f = File::open("hello.txt")?;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/error_handling_part_two.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `short_func`
[INFO] [stdout]   --> src/error_handling_part_two.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn short_func() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `even_shorter`
[INFO] [stdout]   --> src/error_handling_part_two.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn even_shorter() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shortest`
[INFO] [stdout]   --> src/error_handling_part_two.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn shortest() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 |     error_handling_part_two::run();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 26.96s
[INFO] running `Command { std: "docker" "inspect" "bee630f9a1412d8410c0b7307c1a1ca89ecadee608d9f7858aed9f0d8cdb9f37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bee630f9a1412d8410c0b7307c1a1ca89ecadee608d9f7858aed9f0d8cdb9f37", kill_on_drop: false }`
[INFO] [stdout] bee630f9a1412d8410c0b7307c1a1ca89ecadee608d9f7858aed9f0d8cdb9f37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f6e2318d831d812230aad0310a59c5cf31d61f0ea978ce7968ba8ea972a7f6f6
[INFO] running `Command { std: "docker" "start" "-a" "f6e2318d831d812230aad0310a59c5cf31d61f0ea978ce7968ba8ea972a7f6f6", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]  --> src/error_handling_part_two.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let f = File::open("hello.txt")?;
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file`
[INFO] [stderr]   --> src/error_handling_part_two.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `short_func`
[INFO] [stderr]   --> src/error_handling_part_two.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn short_func() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `even_shorter`
[INFO] [stderr]   --> src/error_handling_part_two.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn even_shorter() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `shortest`
[INFO] [stderr]   --> src/error_handling_part_two.rs:41:4
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn shortest() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/main.rs:49:5
[INFO] [stderr]    |
[INFO] [stderr] 49 |     error_handling_part_two::run();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `intro-to-rust` (bin "intro-to-rust" test) generated 6 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.10s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/intro_to_rust-f82f484cc75aa0cd)
[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" "f6e2318d831d812230aad0310a59c5cf31d61f0ea978ce7968ba8ea972a7f6f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f6e2318d831d812230aad0310a59c5cf31d61f0ea978ce7968ba8ea972a7f6f6", kill_on_drop: false }`
[INFO] [stdout] f6e2318d831d812230aad0310a59c5cf31d61f0ea978ce7968ba8ea972a7f6f6