[INFO] cloning repository https://github.com/u2/leetcode-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/u2/leetcode-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu2%2Fleetcode-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu2%2Fleetcode-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 23722bdf01b8f3a080af49de576ff52ccbc1c27a
[INFO] testing u2/leetcode-rust against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu2%2Fleetcode-rust" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/u2/leetcode-rust on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/u2/leetcode-rust
[INFO] finished tweaking git repo https://github.com/u2/leetcode-rust
[INFO] tweaked toml for git repo https://github.com/u2/leetcode-rust written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/u2/leetcode-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b6dbc3052b5095d281f72436e893e4943afa0a4cbaf5918efdc07b876e18904c
[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" "b6dbc3052b5095d281f72436e893e4943afa0a4cbaf5918efdc07b876e18904c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b6dbc3052b5095d281f72436e893e4943afa0a4cbaf5918efdc07b876e18904c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6dbc3052b5095d281f72436e893e4943afa0a4cbaf5918efdc07b876e18904c", kill_on_drop: false }`
[INFO] [stdout] b6dbc3052b5095d281f72436e893e4943afa0a4cbaf5918efdc07b876e18904c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--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] 8c55b11f2eb4d587445971ccda46e6c68fe7faec77c52bc5f4648003f2a2f8a1
[INFO] running `Command { std: "docker" "start" "-a" "8c55b11f2eb4d587445971ccda46e6c68fe7faec77c52bc5f4648003f2a2f8a1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.20
[INFO] [stderr]    Compiling memchr v1.0.1
[INFO] [stderr]    Compiling thread-id v3.0.0
[INFO] [stderr]    Compiling thread_local v0.3.2
[INFO] [stderr]    Compiling aho-corasick v0.6.1
[INFO] [stderr]    Compiling regex v0.2.1
[INFO] [stderr]    Compiling leetcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]  --> src/length_of_longest_substring.rs:7:20
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]   |                    ^    ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 7 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout] 7 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]  --> src/length_of_longest_substring.rs:8:25
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout]   |                         ^    ^
[INFO] [stdout]   |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 8 -     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout] 8 +     let mut c: VecDeque<char> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/length_of_longest_substring.rs:39:20
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]    |                    ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 39 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout] 39 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/find_median_sorted_arrays.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             j - 1;
[INFO] [stdout]    |             ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let _ = j - 1;
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.57s
[INFO] running `Command { std: "docker" "inspect" "8c55b11f2eb4d587445971ccda46e6c68fe7faec77c52bc5f4648003f2a2f8a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c55b11f2eb4d587445971ccda46e6c68fe7faec77c52bc5f4648003f2a2f8a1", kill_on_drop: false }`
[INFO] [stdout] 8c55b11f2eb4d587445971ccda46e6c68fe7faec77c52bc5f4648003f2a2f8a1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 34e39c72983cb176995f47215e13ea86635f0d97bca9b5d3e3528d93fb490eca
[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" "34e39c72983cb176995f47215e13ea86635f0d97bca9b5d3e3528d93fb490eca", 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] [stderr]    Compiling leetcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]  --> src/length_of_longest_substring.rs:7:20
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]   |                    ^    ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 7 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout] 7 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]  --> src/length_of_longest_substring.rs:8:25
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout]   |                         ^    ^
[INFO] [stdout]   |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 8 -     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout] 8 +     let mut c: VecDeque<char> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/length_of_longest_substring.rs:39:20
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]    |                    ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 39 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout] 39 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/find_median_sorted_arrays.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             j - 1;
[INFO] [stdout]    |             ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let _ = j - 1;
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]  --> src/length_of_longest_substring.rs:7:20
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]   |                    ^    ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 7 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout] 7 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]  --> src/length_of_longest_substring.rs:8:25
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout]   |                         ^    ^
[INFO] [stdout]   |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 8 -     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout] 8 +     let mut c: VecDeque<char> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/length_of_longest_substring.rs:39:20
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]    |                    ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 39 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout] 39 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/find_median_sorted_arrays.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             j - 1;
[INFO] [stdout]    |             ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let _ = j - 1;
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.79s
[INFO] running `Command { std: "docker" "inspect" "34e39c72983cb176995f47215e13ea86635f0d97bca9b5d3e3528d93fb490eca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34e39c72983cb176995f47215e13ea86635f0d97bca9b5d3e3528d93fb490eca", kill_on_drop: false }`
[INFO] [stdout] 34e39c72983cb176995f47215e13ea86635f0d97bca9b5d3e3528d93fb490eca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] edf02389fa927279a72c69da1c0488ecf7a867555dd1735bf1399ba06c80eb90
[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" "edf02389fa927279a72c69da1c0488ecf7a867555dd1735bf1399ba06c80eb90", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stdout] running 20 tests
[INFO] [stderr]  --> src/length_of_longest_substring.rs:7:20
[INFO] [stdout] test add_two_numbers::test::test_add_two_numbers ... ok
[INFO] [stderr]   |
[INFO] [stdout] test atoi::test::test_atoi ... ok
[INFO] [stderr] 7 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stdout] test find_median_sorted_arrays::test::test_find_median_sorted_arrays ... ok
[INFO] [stderr]   |                    ^    ^
[INFO] [stdout] test reverse_integer::test::test_reverse_integer ... ok
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr] 7 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr] 7 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr]   | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]  --> src/length_of_longest_substring.rs:8:25
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stderr]   |                         ^    ^
[INFO] [stderr]   |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr] 8 -     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stderr] 8 +     let mut c: VecDeque<char> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stderr]   | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/length_of_longest_substring.rs:39:20
[INFO] [stderr]    |
[INFO] [stderr] 39 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr]    |                    ^    ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 39 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr] 39 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/find_median_sorted_arrays.rs:42:13
[INFO] [stderr]    |
[INFO] [stderr] 42 |             j - 1;
[INFO] [stderr]    |             ^^^^^ the arithmetic operation produces a value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 42 |             let _ = j - 1;
[INFO] [stderr]    |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `leetcode` (lib) generated 4 warnings
[INFO] [stderr] warning: `leetcode` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/leetcode-3366d79069d99f46)
[INFO] [stdout] test length_of_longest_substring::test::bench_approach_two ... ok
[INFO] [stdout] test length_of_longest_substring::test::test_approach_two ... ok
[INFO] [stdout] test length_of_longest_substring::test::test_length_of_longest_substring ... ok
[INFO] [stdout] test longest_palindrome::test::test_longest_palindrome ... ok
[INFO] [stdout] test length_of_longest_substring::test::bench_length_of_longest_substring ... ok
[INFO] [stdout] test two_sum::test::test_two_sum_approach_two ... ok
[INFO] [stdout] test longest_palindrome::test::test_find_longest_palindrome ... ok
[INFO] [stdout] test palindrome_number::test::test_palindrome_number ... ok
[INFO] [stdout] test longest_palindrome::test::test_is_palindrome ... ok
[INFO] [stdout] test two_sum::test::bench_two_sum_approach_two ... ok
[INFO] [stdout] test regular_expression_matching::test::test_regular_expression_matching ... ok
[INFO] [stdout] test zigzag_conversion::test::test_zigzag_conversion ... ok
[INFO] [stdout] test two_sum::test::bench_two_sum ... ok
[INFO] [stdout] test two_sum::test::test_two_sum ... ok
[INFO] [stdout] test longest_palindrome::test::bench_find_longest_palindrome ... ok
[INFO] [stdout] test longest_palindrome::test::bench_longest_palindrome ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.31s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests leetcode
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]  --> /opt/rustwide/workdir/src/length_of_longest_substring.rs:7:20
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr]   |                    ^    ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr] 7 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr] 7 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr]   | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]  --> /opt/rustwide/workdir/src/length_of_longest_substring.rs:8:25
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stderr]   |                         ^    ^
[INFO] [stderr]   |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr] 8 -     let mut c: VecDeque<(char)> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stderr] 8 +     let mut c: VecDeque<char> = VecDeque::with_capacity(s.char_indices().count());
[INFO] [stderr]   | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> /opt/rustwide/workdir/src/length_of_longest_substring.rs:39:20
[INFO] [stderr]    |
[INFO] [stderr] 39 |     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr]    |                    ^    ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 39 -     let array: Vec<(char)> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr] 39 +     let array: Vec<char> = s.char_indices().map(|i| i.1).collect::<Vec<_>>();
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stdout] running 0 tests
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "edf02389fa927279a72c69da1c0488ecf7a867555dd1735bf1399ba06c80eb90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edf02389fa927279a72c69da1c0488ecf7a867555dd1735bf1399ba06c80eb90", kill_on_drop: false }`
[INFO] [stdout] edf02389fa927279a72c69da1c0488ecf7a867555dd1735bf1399ba06c80eb90