[INFO] cloning repository https://github.com/snek100/primefinder
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/snek100/primefinder" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsnek100%2Fprimefinder", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsnek100%2Fprimefinder'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 27a4b0c4677a223b6a42b5bbd74a58cdae820076
[INFO] checking snek100/primefinder against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsnek100%2Fprimefinder" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/snek100/primefinder
[INFO] finished tweaking git repo https://github.com/snek100/primefinder
[INFO] tweaked toml for git repo https://github.com/snek100/primefinder written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/snek100/primefinder on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/snek100/primefinder 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] [stderr]       Adding cache-padded v1.3.0
[INFO] [stderr]       Adding ringbuf v0.2.8 (available: v0.4.8)
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1bddda3c4a77e0ab2e986dec874464c5506345b85cf4aa15a7acc88e4d7b6a7f
[INFO] running `Command { std: "docker" "start" "-a" "1bddda3c4a77e0ab2e986dec874464c5506345b85cf4aa15a7acc88e4d7b6a7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1bddda3c4a77e0ab2e986dec874464c5506345b85cf4aa15a7acc88e4d7b6a7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bddda3c4a77e0ab2e986dec874464c5506345b85cf4aa15a7acc88e4d7b6a7f", kill_on_drop: false }`
[INFO] [stdout] 1bddda3c4a77e0ab2e986dec874464c5506345b85cf4aa15a7acc88e4d7b6a7f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ced1c0942b4df8663ea3dc88e9096c5b763daaaaee320dda082da558c65daceb
[INFO] running `Command { std: "docker" "start" "-a" "ced1c0942b4df8663ea3dc88e9096c5b763daaaaee320dda082da558c65daceb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.121
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking cache-padded v1.3.0
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking ringbuf v0.2.8
[INFO] [stderr]     Checking terminal_size v0.1.17
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking console v0.15.0
[INFO] [stderr]     Checking indicatif v0.16.2
[INFO] [stderr]     Checking prime_finder v3.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]    --> src/lib.rs:228:39
[INFO] [stdout]     |
[INFO] [stdout] 228 |         assert_eq!(smalls_prime_chart[(checking - 1)], primeiness);
[INFO] [stdout]     |                                       ^            ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 228 -         assert_eq!(smalls_prime_chart[(checking - 1)], primeiness);
[INFO] [stdout] 228 +         assert_eq!(smalls_prime_chart[checking - 1 ], primeiness);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]    --> src/lib.rs:236:67
[INFO] [stdout]     |
[INFO] [stdout] 236 |             let divisor = finds_if_number_is_prime((problems_list[(checking - 1)]).try_into().unwrap());
[INFO] [stdout]     |                                                                   ^            ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 236 -             let divisor = finds_if_number_is_prime((problems_list[(checking - 1)]).try_into().unwrap());
[INFO] [stdout] 236 +             let divisor = finds_if_number_is_prime((problems_list[checking - 1 ]).try_into().unwrap());
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]    --> src/lib.rs:245:45
[INFO] [stdout]     |
[INFO] [stdout] 245 |             assert_eq!(problems_prime_chart[(checking - 1)], primeiness);
[INFO] [stdout]     |                                             ^            ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 245 -             assert_eq!(problems_prime_chart[(checking - 1)], primeiness);
[INFO] [stdout] 245 +             assert_eq!(problems_prime_chart[checking - 1 ], primeiness);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `prime` is never read
[INFO] [stdout]    --> src/lib.rs:167:42
[INFO] [stdout]     |
[INFO] [stdout] 167 |                     let mut prime:bool = true;
[INFO] [stdout]     |                                          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `checking` is never read
[INFO] [stdout]    --> src/lib.rs:169:40
[INFO] [stdout]     |
[INFO] [stdout] 169 |                     let mut checking = 2;
[INFO] [stdout]     |                                        ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `prime` is never read
[INFO] [stdout]    --> src/lib.rs:167:42
[INFO] [stdout]     |
[INFO] [stdout] 167 |                     let mut prime:bool = true;
[INFO] [stdout]     |                                          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `checking` is never read
[INFO] [stdout]    --> src/lib.rs:169:40
[INFO] [stdout]     |
[INFO] [stdout] 169 |                     let mut checking = 2;
[INFO] [stdout]     |                                        ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `primeiness` is never read
[INFO] [stdout]    --> src/lib.rs:220:30
[INFO] [stdout]     |
[INFO] [stdout] 220 |         let mut primeiness = false;
[INFO] [stdout]     |                              ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]   --> src/lib.rs:33:34
[INFO] [stdout]    |
[INFO] [stdout] 33 |                  let root:u128 = number_to_check.sqrt().try_into().unwrap();
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `primeiness` is never read
[INFO] [stdout]    --> src/lib.rs:237:34
[INFO] [stdout]     |
[INFO] [stdout] 237 |             let mut primeiness = false;
[INFO] [stdout]     |                                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]   --> src/lib.rs:33:34
[INFO] [stdout]    |
[INFO] [stdout] 33 |                  let root:u128 = number_to_check.sqrt().try_into().unwrap();
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]    --> src/lib.rs:236:52
[INFO] [stdout]     |
[INFO] [stdout] 236 |             let divisor = finds_if_number_is_prime((problems_list[(checking - 1)]).try_into().unwrap());
[INFO] [stdout]     |                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `prime_finder` (lib) due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `prime_finder` (lib test) due to 2 previous errors; 7 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "ced1c0942b4df8663ea3dc88e9096c5b763daaaaee320dda082da558c65daceb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ced1c0942b4df8663ea3dc88e9096c5b763daaaaee320dda082da558c65daceb", kill_on_drop: false }`
[INFO] [stdout] ced1c0942b4df8663ea3dc88e9096c5b763daaaaee320dda082da558c65daceb