[INFO] cloning repository https://github.com/hujewelz/rust_by_example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hujewelz/rust_by_example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhujewelz%2Frust_by_example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhujewelz%2Frust_by_example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1bdc070fd576e0d2d53a9168194b92c04bdb5381
[INFO] checking hujewelz/rust_by_example against try#eb43a7af9abeacf703345e49daba222ddc0623e9 for pr-95565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhujewelz%2Frust_by_example" "/workspace/builds/worker-34/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-34/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hujewelz/rust_by_example on toolchain eb43a7af9abeacf703345e49daba222ddc0623e9
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+eb43a7af9abeacf703345e49daba222ddc0623e9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hujewelz/rust_by_example
[INFO] finished tweaking git repo https://github.com/hujewelz/rust_by_example
[INFO] tweaked toml for git repo https://github.com/hujewelz/rust_by_example written to /workspace/builds/worker-34/source/Cargo.toml
[INFO] crate git repo https://github.com/hujewelz/rust_by_example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+eb43a7af9abeacf703345e49daba222ddc0623e9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+eb43a7af9abeacf703345e49daba222ddc0623e9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ee1d0dc471c9674be3765bf95e99cbdc2b962ac278de47d5a3e3b8b04201e3be
[INFO] running `Command { std: "docker" "start" "-a" "ee1d0dc471c9674be3765bf95e99cbdc2b962ac278de47d5a3e3b8b04201e3be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ee1d0dc471c9674be3765bf95e99cbdc2b962ac278de47d5a3e3b8b04201e3be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee1d0dc471c9674be3765bf95e99cbdc2b962ac278de47d5a3e3b8b04201e3be", kill_on_drop: false }`
[INFO] [stdout] ee1d0dc471c9674be3765bf95e99cbdc2b962ac278de47d5a3e3b8b04201e3be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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" "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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+eb43a7af9abeacf703345e49daba222ddc0623e9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ed7ed4e50511f53a9a4efebf3e0d99e939f7b645b8afeb823015db24c40cf388
[INFO] running `Command { std: "docker" "start" "-a" "ed7ed4e50511f53a9a4efebf3e0d99e939f7b645b8afeb823015db24c40cf388", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_by_example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `read_file2`
[INFO] [stdout]   --> src/error_handling.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn read_file2() -> 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: `last_char_of_first_line`
[INFO] [stdout]   --> src/error_handling.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn last_char_of_first_line(text: &str) -> Option<char> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_file2`
[INFO] [stdout]   --> src/error_handling.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn read_file2() -> 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: `last_char_of_first_line`
[INFO] [stdout]   --> src/error_handling.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn last_char_of_first_line(text: &str) -> Option<char> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.61s
[INFO] running `Command { std: "docker" "inspect" "ed7ed4e50511f53a9a4efebf3e0d99e939f7b645b8afeb823015db24c40cf388", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed7ed4e50511f53a9a4efebf3e0d99e939f7b645b8afeb823015db24c40cf388", kill_on_drop: false }`
[INFO] [stdout] ed7ed4e50511f53a9a4efebf3e0d99e939f7b645b8afeb823015db24c40cf388