[INFO] cloning repository https://github.com/t0nkisa/sudoku_rust_algo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/t0nkisa/sudoku_rust_algo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ft0nkisa%2Fsudoku_rust_algo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ft0nkisa%2Fsudoku_rust_algo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a953824bef6c6f356778edb0583d94139a54d2b4
[INFO] checking t0nkisa/sudoku_rust_algo against try#6757d700f93f6d16c8b39cf79e96b019bd570e7d for pr-155299
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ft0nkisa%2Fsudoku_rust_algo" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/t0nkisa/sudoku_rust_algo
[INFO] finished tweaking git repo https://github.com/t0nkisa/sudoku_rust_algo
[INFO] tweaked toml for git repo https://github.com/t0nkisa/sudoku_rust_algo written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/t0nkisa/sudoku_rust_algo on toolchain 6757d700f93f6d16c8b39cf79e96b019bd570e7d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6757d700f93f6d16c8b39cf79e96b019bd570e7d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/t0nkisa/sudoku_rust_algo 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" "+6757d700f93f6d16c8b39cf79e96b019bd570e7d" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+6757d700f93f6d16c8b39cf79e96b019bd570e7d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 726db8f6d9dc79f6e7cbc76e020bf8a7a0074628adae8c099da475fba93d2c25
[INFO] running `Command { std: "docker" "start" "-a" "726db8f6d9dc79f6e7cbc76e020bf8a7a0074628adae8c099da475fba93d2c25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "726db8f6d9dc79f6e7cbc76e020bf8a7a0074628adae8c099da475fba93d2c25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "726db8f6d9dc79f6e7cbc76e020bf8a7a0074628adae8c099da475fba93d2c25", kill_on_drop: false }`
[INFO] [stdout] 726db8f6d9dc79f6e7cbc76e020bf8a7a0074628adae8c099da475fba93d2c25
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+6757d700f93f6d16c8b39cf79e96b019bd570e7d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 53311862e386664006b543faf8f0ad55b17f523101a3efb88260769fee97c25b
[INFO] running `Command { std: "docker" "start" "-a" "53311862e386664006b543faf8f0ad55b17f523101a3efb88260769fee97c25b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking sudoku_algo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: methods `is_solved` and `next_empty_cell` are never used
[INFO] [stdout]    --> src/main.rs:201:8
[INFO] [stdout]     |
[INFO] [stdout] 120 | impl App {
[INFO] [stdout]     | -------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 201 |     fn is_solved(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 254 |     fn next_empty_cell<'a>(&'a self, vec: Vec<&'a Cell>) -> Option<&Cell> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/main.rs:254:68
[INFO] [stdout]     |
[INFO] [stdout] 254 |     fn next_empty_cell<'a>(&'a self, vec: Vec<&'a Cell>) -> Option<&Cell> {
[INFO] [stdout]     |                             --                 --                  ^^^^^ the same lifetime is elided here
[INFO] [stdout]     |                             |                  |
[INFO] [stdout]     |                             |                  the lifetime is named here
[INFO] [stdout]     |                             the lifetime is named here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 254 |     fn next_empty_cell<'a>(&'a self, vec: Vec<&'a Cell>) -> Option<&'a Cell> {
[INFO] [stdout]     |                                                                     ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_solved` and `next_empty_cell` are never used
[INFO] [stdout]    --> src/main.rs:201:8
[INFO] [stdout]     |
[INFO] [stdout] 120 | impl App {
[INFO] [stdout]     | -------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 201 |     fn is_solved(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 254 |     fn next_empty_cell<'a>(&'a self, vec: Vec<&'a Cell>) -> Option<&Cell> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/main.rs:254:68
[INFO] [stdout]     |
[INFO] [stdout] 254 |     fn next_empty_cell<'a>(&'a self, vec: Vec<&'a Cell>) -> Option<&Cell> {
[INFO] [stdout]     |                             --                 --                  ^^^^^ the same lifetime is elided here
[INFO] [stdout]     |                             |                  |
[INFO] [stdout]     |                             |                  the lifetime is named here
[INFO] [stdout]     |                             the lifetime is named here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 254 |     fn next_empty_cell<'a>(&'a self, vec: Vec<&'a Cell>) -> Option<&'a Cell> {
[INFO] [stdout]     |                                                                     ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.07s
[INFO] running `Command { std: "docker" "inspect" "53311862e386664006b543faf8f0ad55b17f523101a3efb88260769fee97c25b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53311862e386664006b543faf8f0ad55b17f523101a3efb88260769fee97c25b", kill_on_drop: false }`
[INFO] [stdout] 53311862e386664006b543faf8f0ad55b17f523101a3efb88260769fee97c25b