[INFO] cloning repository https://github.com/rust-notes-and-demos/algo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rust-notes-and-demos/algo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-notes-and-demos%2Falgo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-notes-and-demos%2Falgo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1ae5c4608db26bf7a32be96947d77f02b03c7a18
[INFO] checking rust-notes-and-demos/algo against try#4797991aa2efb6d658150f10425b3f3b5d10eceb for pr-143193
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-notes-and-demos%2Falgo" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/rust-notes-and-demos/algo
[INFO] finished tweaking git repo https://github.com/rust-notes-and-demos/algo
[INFO] tweaked toml for git repo https://github.com/rust-notes-and-demos/algo written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/rust-notes-and-demos/algo on toolchain 4797991aa2efb6d658150f10425b3f3b5d10eceb
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4797991aa2efb6d658150f10425b3f3b5d10eceb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/rust-notes-and-demos/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" "+4797991aa2efb6d658150f10425b3f3b5d10eceb" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+4797991aa2efb6d658150f10425b3f3b5d10eceb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fd577128bb5b8a891155e00aef9b979afbdcf6e48ef98d1c97cfb71887fa08c5
[INFO] running `Command { std: "docker" "start" "-a" "fd577128bb5b8a891155e00aef9b979afbdcf6e48ef98d1c97cfb71887fa08c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd577128bb5b8a891155e00aef9b979afbdcf6e48ef98d1c97cfb71887fa08c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd577128bb5b8a891155e00aef9b979afbdcf6e48ef98d1c97cfb71887fa08c5", kill_on_drop: false }`
[INFO] [stdout] fd577128bb5b8a891155e00aef9b979afbdcf6e48ef98d1c97cfb71887fa08c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+4797991aa2efb6d658150f10425b3f3b5d10eceb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ea1b4cc1938ef5095fa29fee98aeb7a5cbf77d6640db17570b180640c46c0a3
[INFO] running `Command { std: "docker" "start" "-a" "1ea1b4cc1938ef5095fa29fee98aeb7a5cbf77d6640db17570b180640c46c0a3", kill_on_drop: false }`
[INFO] [stderr]     Checking algo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `input_array`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn two_sum_brute_force(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                        ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_input_array`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target_sum`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:10:47
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn two_sum_brute_force(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                                               ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_target_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input_array`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:16:19
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn two_sum_better(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                   ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_input_array`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target_sum`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:16:42
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn two_sum_better(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                                          ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_target_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input_array`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:22:17
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn two_sum_best(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                 ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_input_array`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target_sum`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:22:40
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn two_sum_best(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                                        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_target_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/solutions/two_num_sum.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 |         for (j, num2) in input_array[i+1..].iter().enumerate() {
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/solutions/two_num_sum.rs:49:17
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn two_sum_best(mut input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                 ----^^^^^^^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_brute_force` is never used
[INFO] [stdout]   --> src/questions/two_num_sum.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn two_sum_brute_force(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_better` is never used
[INFO] [stdout]   --> src/questions/two_num_sum.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn two_sum_better(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_best` is never used
[INFO] [stdout]   --> src/questions/two_num_sum.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn two_sum_best(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_brute_force` is never used
[INFO] [stdout]   --> src/solutions/two_num_sum.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn two_sum_brute_force(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_better` is never used
[INFO] [stdout]   --> src/solutions/two_num_sum.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn two_sum_better(mut input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_best` is never used
[INFO] [stdout]   --> src/solutions/two_num_sum.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn two_sum_best(mut input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input_array`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn two_sum_brute_force(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                        ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_input_array`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target_sum`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:10:47
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn two_sum_brute_force(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                                               ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_target_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input_array`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:16:19
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn two_sum_better(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                   ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_input_array`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target_sum`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:16:42
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn two_sum_better(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                                          ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_target_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input_array`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:22:17
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn two_sum_best(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                 ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_input_array`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target_sum`
[INFO] [stdout]   --> src/questions/two_num_sum.rs:22:40
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn two_sum_best(input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                                        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_target_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/solutions/two_num_sum.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 |         for (j, num2) in input_array[i+1..].iter().enumerate() {
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/solutions/two_num_sum.rs:49:17
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn two_sum_best(mut input_array: Vec<i32>, target_sum: i32) -> Vec<i32> {
[INFO] [stdout]    |                 ----^^^^^^^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "1ea1b4cc1938ef5095fa29fee98aeb7a5cbf77d6640db17570b180640c46c0a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ea1b4cc1938ef5095fa29fee98aeb7a5cbf77d6640db17570b180640c46c0a3", kill_on_drop: false }`
[INFO] [stdout] 1ea1b4cc1938ef5095fa29fee98aeb7a5cbf77d6640db17570b180640c46c0a3