[INFO] cloning repository https://github.com/rotwatsb/code_kata
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rotwatsb/code_kata" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frotwatsb%2Fcode_kata", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frotwatsb%2Fcode_kata'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 232189e70ed0dbb1665ab38aacc282a839c80a63
[INFO] checking rotwatsb/code_kata against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frotwatsb%2Fcode_kata" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rotwatsb/code_kata on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rotwatsb/code_kata
[INFO] finished tweaking git repo https://github.com/rotwatsb/code_kata
[INFO] tweaked toml for git repo https://github.com/rotwatsb/code_kata written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/rotwatsb/code_kata already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-8/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bbf09fd7c53f924fa35b6739060000016b409d8290951d16e9b3d4cf0706f4be
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bbf09fd7c53f924fa35b6739060000016b409d8290951d16e9b3d4cf0706f4be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bbf09fd7c53f924fa35b6739060000016b409d8290951d16e9b3d4cf0706f4be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbf09fd7c53f924fa35b6739060000016b409d8290951d16e9b3d4cf0706f4be", kill_on_drop: false }`
[INFO] [stdout] bbf09fd7c53f924fa35b6739060000016b409d8290951d16e9b3d4cf0706f4be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ad4e8b58f49af5d921d066b08806e6459d0c40b49735f6e403ab80104e7fbe5d
[INFO] running `Command { std: "docker" "start" "-a" "ad4e8b58f49af5d921d066b08806e6459d0c40b49735f6e403ab80104e7fbe5d", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.79
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking code_kata v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |         'inner: for i in 1..num_digits {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/euler/longest_collatz_14.rs:29:13
[INFO] [stdout]    |
[INFO] [stdout] 29 | /             (if n % 2 == 0 { 1 + cmp_collatz(n / 2, stored_vals) }
[INFO] [stdout] 30 | |              else { 1 + cmp_collatz(3 * n + 1, stored_vals) });
[INFO] [stdout]    | |______________________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 29 |             if n % 2 == 0 { 1 + cmp_collatz(n / 2, stored_vals) }
[INFO] [stdout] 30 |              else { 1 + cmp_collatz(3 * n + 1, stored_vals) };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp`
[INFO] [stdout]  --> src/euler/triangular_12.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cmp;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `utils`
[INFO] [stdout]  --> src/hackerrank/modfib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use utils;
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/hackerrank/cut_the_tree.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/hackerrank/knapsack.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 | /         (if sizes[n] > c {
[INFO] [stdout] 29 | |             if n == 0 { return 0; }
[INFO] [stdout] 30 | |             max_knapsack(c, n - 1, sizes, values, memoized)
[INFO] [stdout] 31 | |          }
[INFO] [stdout] ...  |
[INFO] [stdout] 35 | |                       max_knapsack(c, n - 1, sizes, values, memoized))
[INFO] [stdout] 36 | |          });
[INFO] [stdout]    | |___________^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 28 |         if sizes[n] > c {
[INFO] [stdout] 29 |             if n == 0 { return 0; }
[INFO] [stdout] 30 |             max_knapsack(c, n - 1, sizes, values, memoized)
[INFO] [stdout] 31 |          }
[INFO] [stdout] 32 |          else {
[INFO] [stdout] 33 |              if n == 0 { return values[0]; }
[INFO] [stdout]  ...
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/interviewbit/max_sum_path_in_binary_tree.rs:33:30
[INFO] [stdout]    |
[INFO] [stdout] 33 |     *max_sum = max(*max_sum, (sum_of_sums + vals[i]));
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |         'inner: for i in 1..num_digits {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/euler/longest_collatz_14.rs:29:13
[INFO] [stdout]    |
[INFO] [stdout] 29 | /             (if n % 2 == 0 { 1 + cmp_collatz(n / 2, stored_vals) }
[INFO] [stdout] 30 | |              else { 1 + cmp_collatz(3 * n + 1, stored_vals) });
[INFO] [stdout]    | |______________________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 29 |             if n % 2 == 0 { 1 + cmp_collatz(n / 2, stored_vals) }
[INFO] [stdout] 30 |              else { 1 + cmp_collatz(3 * n + 1, stored_vals) };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp`
[INFO] [stdout]  --> src/euler/triangular_12.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cmp;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `utils`
[INFO] [stdout]  --> src/hackerrank/modfib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use utils;
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/hackerrank/cut_the_tree.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/hackerrank/knapsack.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 | /         (if sizes[n] > c {
[INFO] [stdout] 29 | |             if n == 0 { return 0; }
[INFO] [stdout] 30 | |             max_knapsack(c, n - 1, sizes, values, memoized)
[INFO] [stdout] 31 | |          }
[INFO] [stdout] ...  |
[INFO] [stdout] 35 | |                       max_knapsack(c, n - 1, sizes, values, memoized))
[INFO] [stdout] 36 | |          });
[INFO] [stdout]    | |___________^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 28 |         if sizes[n] > c {
[INFO] [stdout] 29 |             if n == 0 { return 0; }
[INFO] [stdout] 30 |             max_knapsack(c, n - 1, sizes, values, memoized)
[INFO] [stdout] 31 |          }
[INFO] [stdout] 32 |          else {
[INFO] [stdout] 33 |              if n == 0 { return values[0]; }
[INFO] [stdout]  ...
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/interviewbit/max_sum_path_in_binary_tree.rs:33:30
[INFO] [stdout]    |
[INFO] [stdout] 33 |     *max_sum = max(*max_sum, (sum_of_sums + vals[i]));
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/utils.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     for i in 1 .. nodes {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/utils.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     for i in 0..r {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/utils.rs:64:13
[INFO] [stdout]    |
[INFO] [stdout] 64 |         for j in 0..c {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `num_digits` is never read
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut num_digits: usize = 0;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `t` is never read
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut t: usize = 0;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `d` is never read
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut d: usize = 0;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:31:21
[INFO] [stdout]    |
[INFO] [stdout] 31 |         'inner: for i in 1..num_digits {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `v` is never read
[INFO] [stdout]  --> src/euler/triangular_12.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut v: usize = 0;
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sign`
[INFO] [stdout]   --> src/hackerrank/modfib.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let (sign, v) = starts[2].to_bytes_le();
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_sign`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]  --> src/hackerrank/the_grid_search.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     for t in 0u32..t_str.trim().parse().unwrap() {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     for i in 0..r {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/hackerrank/knapsack.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `max`
[INFO] [stdout]   --> src/interviewbit/max_sum_path_in_binary_tree.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let max = max_path(0, 0, &vals, &cnxs, &mut max_sum);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_max`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/utils.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     for i in 1 .. nodes {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/utils.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     for i in 0..r {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/utils.rs:64:13
[INFO] [stdout]    |
[INFO] [stdout] 64 |         for j in 0..c {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `num_digits` is never read
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut num_digits: usize = 0;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `t` is never read
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut t: usize = 0;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `d` is never read
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut d: usize = 0;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:31:21
[INFO] [stdout]    |
[INFO] [stdout] 31 |         'inner: for i in 1..num_digits {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `v` is never read
[INFO] [stdout]  --> src/euler/triangular_12.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut v: usize = 0;
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sign`
[INFO] [stdout]   --> src/hackerrank/modfib.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let (sign, v) = starts[2].to_bytes_le();
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_sign`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]  --> src/hackerrank/the_grid_search.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     for t in 0u32..t_str.trim().parse().unwrap() {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     for i in 0..r {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/hackerrank/knapsack.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `max`
[INFO] [stdout]   --> src/interviewbit/max_sum_path_in_binary_tree.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let max = max_path(0, 0, &vals, &cnxs, &mut max_sum);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_max`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut primes2 = primes.clone();
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut primes2 = primes.clone();
[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 is never used: `read_usize_pair`
[INFO] [stdout]   --> src/utils.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn read_usize_pair() -> (usize, usize) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_matrix_u32`
[INFO] [stdout]   --> src/utils.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub fn read_matrix_u32() -> Vec<Vec<u32>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `UPPER_BOUND`
[INFO] [stdout]  --> src/euler/circular_primes_35.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | const UPPER_BOUND: usize = 1000000;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `circularprimes`
[INFO] [stdout]  --> src/euler/circular_primes_35.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn circularprimes() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_prime`
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn is_prime(n: usize, primes: &Vec<usize>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `UPPER_BOUND`
[INFO] [stdout]  --> src/euler/longest_collatz_14.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const UPPER_BOUND: usize = 1000000;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_collatz`
[INFO] [stdout]  --> src/euler/longest_collatz_14.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn longest_collatz() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cmp_collatz`
[INFO] [stdout]   --> src/euler/longest_collatz_14.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn cmp_collatz(n: usize, stored_vals: &mut HashMap<usize, usize>) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve`
[INFO] [stdout]  --> src/euler/triangular_12.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn solve() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `num_factors`
[INFO] [stdout]   --> src/euler/triangular_12.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn num_factors(n: usize) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_bigints`
[INFO] [stdout]  --> src/utils.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         pub fn $func_name() -> Vec<$num_type> {
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   | 
[INFO] [stdout]  ::: src/hackerrank/modfib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | read_num_vec!(read_bigints, BigInt);
[INFO] [stdout]   | ------------------------------------ in this macro invocation
[INFO] [stdout]   |
[INFO] [stdout]   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `modified_fib`
[INFO] [stdout]  --> src/hackerrank/modfib.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn modified_fib() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calc_mod_fib`
[INFO] [stdout]   --> src/hackerrank/modfib.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn calc_mod_fib(n: usize, mod_fibs: &mut Vec<BigInt>) -> BigInt {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `connected_cell_in_grid`
[INFO] [stdout]  --> src/hackerrank/connected_cell_in_grid.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn connected_cell_in_grid() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `explore`
[INFO] [stdout]   --> src/hackerrank/connected_cell_in_grid.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn explore(m: &mut Vec<Vec<u32>>, r: isize, c: isize) -> u32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `grid_search`
[INFO] [stdout]  --> src/hackerrank/the_grid_search.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn grid_search() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `contains`
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn contains(g: &Vec<String>, p: &Vec<String>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `match_at`
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn match_at(g: &Vec<String>, p: &Vec<String>, r: usize, c: usize) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_matrix`
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn read_matrix() -> Vec<String> {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `knapsack`
[INFO] [stdout]  --> src/hackerrank/knapsack.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn knapsack() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `max_knapsack`
[INFO] [stdout]   --> src/hackerrank/knapsack.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn max_knapsack(c: usize, n: usize, sizes: &Vec<usize>, values: &Vec<usize>,
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `max_sum`
[INFO] [stdout]  --> src/interviewbit/max_sum_path_in_binary_tree.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn max_sum() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `max_path`
[INFO] [stdout]   --> src/interviewbit/max_sum_path_in_binary_tree.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn max_path(i: usize, par: usize, vals: &Vec<i32>,
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(inclusive_range_syntax)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_usize_pair`
[INFO] [stdout]   --> src/utils.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn read_usize_pair() -> (usize, usize) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_matrix_u32`
[INFO] [stdout]   --> src/utils.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub fn read_matrix_u32() -> Vec<Vec<u32>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `UPPER_BOUND`
[INFO] [stdout]  --> src/euler/circular_primes_35.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | const UPPER_BOUND: usize = 1000000;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `circularprimes`
[INFO] [stdout]  --> src/euler/circular_primes_35.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn circularprimes() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_prime`
[INFO] [stdout]   --> src/euler/circular_primes_35.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn is_prime(n: usize, primes: &Vec<usize>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `UPPER_BOUND`
[INFO] [stdout]  --> src/euler/longest_collatz_14.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const UPPER_BOUND: usize = 1000000;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_collatz`
[INFO] [stdout]  --> src/euler/longest_collatz_14.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn longest_collatz() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cmp_collatz`
[INFO] [stdout]   --> src/euler/longest_collatz_14.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn cmp_collatz(n: usize, stored_vals: &mut HashMap<usize, usize>) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve`
[INFO] [stdout]  --> src/euler/triangular_12.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn solve() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `num_factors`
[INFO] [stdout]   --> src/euler/triangular_12.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn num_factors(n: usize) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_bigints`
[INFO] [stdout]  --> src/utils.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         pub fn $func_name() -> Vec<$num_type> {
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   | 
[INFO] [stdout]  ::: src/hackerrank/modfib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | read_num_vec!(read_bigints, BigInt);
[INFO] [stdout]   | ------------------------------------ in this macro invocation
[INFO] [stdout]   |
[INFO] [stdout]   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `modified_fib`
[INFO] [stdout]  --> src/hackerrank/modfib.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn modified_fib() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calc_mod_fib`
[INFO] [stdout]   --> src/hackerrank/modfib.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn calc_mod_fib(n: usize, mod_fibs: &mut Vec<BigInt>) -> BigInt {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `connected_cell_in_grid`
[INFO] [stdout]  --> src/hackerrank/connected_cell_in_grid.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn connected_cell_in_grid() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `explore`
[INFO] [stdout]   --> src/hackerrank/connected_cell_in_grid.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn explore(m: &mut Vec<Vec<u32>>, r: isize, c: isize) -> u32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `grid_search`
[INFO] [stdout]  --> src/hackerrank/the_grid_search.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn grid_search() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `contains`
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn contains(g: &Vec<String>, p: &Vec<String>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `match_at`
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn match_at(g: &Vec<String>, p: &Vec<String>, r: usize, c: usize) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_matrix`
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn read_matrix() -> Vec<String> {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `knapsack`
[INFO] [stdout]  --> src/hackerrank/knapsack.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn knapsack() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `max_knapsack`
[INFO] [stdout]   --> src/hackerrank/knapsack.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn max_knapsack(c: usize, n: usize, sizes: &Vec<usize>, values: &Vec<usize>,
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `max_sum`
[INFO] [stdout]  --> src/interviewbit/max_sum_path_in_binary_tree.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn max_sum() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `max_path`
[INFO] [stdout]   --> src/interviewbit/max_sum_path_in_binary_tree.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn max_path(i: usize, par: usize, vals: &Vec<i32>,
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `inclusive_range_syntax` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(inclusive_range_syntax)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     io::stdin().read_line(&mut line);
[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: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:7:13
[INFO] [stdout]    |
[INFO] [stdout] 7  |             io::stdin().read_line(&mut line);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 | read_num_vec!(read_ints, i32);
[INFO] [stdout]    | ------------------------------ in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     io::stdin().read_line(&mut r_str);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     io::stdin().read_line(&mut c_str);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |         io::stdin().read_line(&mut row);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]  --> src/utils.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |             io::stdin().read_line(&mut line);
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   | 
[INFO] [stdout]  ::: src/hackerrank/modfib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | read_num_vec!(read_bigints, BigInt);
[INFO] [stdout]   | ------------------------------------ in this macro invocation
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]  --> src/hackerrank/the_grid_search.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     io::stdin().read_line(&mut t_str);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     io::stdin().read_line(&mut grgc_str);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |         io::stdin().read_line(&mut row);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 54 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     io::stdin().read_line(&mut line);
[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: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:7:13
[INFO] [stdout]    |
[INFO] [stdout] 7  |             io::stdin().read_line(&mut line);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 | read_num_vec!(read_ints, i32);
[INFO] [stdout]    | ------------------------------ in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     io::stdin().read_line(&mut r_str);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     io::stdin().read_line(&mut c_str);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utils.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |         io::stdin().read_line(&mut row);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]  --> src/utils.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |             io::stdin().read_line(&mut line);
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   | 
[INFO] [stdout]  ::: src/hackerrank/modfib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | read_num_vec!(read_bigints, BigInt);
[INFO] [stdout]   | ------------------------------------ in this macro invocation
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]  --> src/hackerrank/the_grid_search.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     io::stdin().read_line(&mut t_str);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     io::stdin().read_line(&mut grgc_str);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/hackerrank/the_grid_search.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |         io::stdin().read_line(&mut row);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 54 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.97s
[INFO] running `Command { std: "docker" "inspect" "ad4e8b58f49af5d921d066b08806e6459d0c40b49735f6e403ab80104e7fbe5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad4e8b58f49af5d921d066b08806e6459d0c40b49735f6e403ab80104e7fbe5d", kill_on_drop: false }`
[INFO] [stdout] ad4e8b58f49af5d921d066b08806e6459d0c40b49735f6e403ab80104e7fbe5d