[INFO] cloning repository https://github.com/satanson/rust_etudes
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/satanson/rust_etudes" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsatanson%2Frust_etudes", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsatanson%2Frust_etudes'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0501fe82134be8ab3428a96b7818367e4bb95d77
[INFO] checking satanson/rust_etudes/0501fe82134be8ab3428a96b7818367e4bb95d77 against master#32cd9114712a24010b0583624dc52ac302194128 for pr-143717
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsatanson%2Frust_etudes" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/satanson/rust_etudes
[INFO] finished tweaking git repo https://github.com/satanson/rust_etudes
[INFO] tweaked toml for git repo https://github.com/satanson/rust_etudes written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/satanson/rust_etudes on toolchain 32cd9114712a24010b0583624dc52ac302194128
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+32cd9114712a24010b0583624dc52ac302194128" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/satanson/rust_etudes 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" "+32cd9114712a24010b0583624dc52ac302194128" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: /workspace/builds/worker-7-tc1/source/non_proc_macro/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr] warning: /workspace/builds/worker-7-tc1/source/my_proc_macro/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+32cd9114712a24010b0583624dc52ac302194128" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 787b1d8f5dabb18230f6885cb8c3ef6b80dbd86c6ad7934b119d69d5ec24be66
[INFO] running `Command { std: "docker" "start" "-a" "787b1d8f5dabb18230f6885cb8c3ef6b80dbd86c6ad7934b119d69d5ec24be66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "787b1d8f5dabb18230f6885cb8c3ef6b80dbd86c6ad7934b119d69d5ec24be66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "787b1d8f5dabb18230f6885cb8c3ef6b80dbd86c6ad7934b119d69d5ec24be66", kill_on_drop: false }`
[INFO] [stdout] 787b1d8f5dabb18230f6885cb8c3ef6b80dbd86c6ad7934b119d69d5ec24be66
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+32cd9114712a24010b0583624dc52ac302194128" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cfe5c37e7a40562e90bb165f1e1c0f612b79667229677bbcca86d1fbf37bb0e3
[INFO] running `Command { std: "docker" "start" "-a" "cfe5c37e7a40562e90bb165f1e1c0f612b79667229677bbcca86d1fbf37bb0e3", kill_on_drop: false }`
[INFO] [stderr] warning: /opt/rustwide/workdir/my_proc_macro/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr] warning: /opt/rustwide/workdir/non_proc_macro/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr]     Checking common v0.1.0 (/opt/rustwide/workdir/common)
[INFO] [stderr]    Compiling my_proc_macro v1.0.0 (/opt/rustwide/workdir/my_proc_macro)
[INFO] [stderr]     Checking etudes v0.1.0 (/opt/rustwide/workdir/etudes)
[INFO] [stderr]     Checking Longest_Substring_Without_Repeating_Characters v0.1.0 (/opt/rustwide/workdir/Longest_Substring_Without_Repeating_Characters)
[INFO] [stderr]     Checking n014_Longest_Common_Prefix v0.1.0 (/opt/rustwide/workdir/n014_Longest_Common_Prefix)
[INFO] [stderr]     Checking n028_Implement_strStr v0.1.0 (/opt/rustwide/workdir/n028_Implement_strStr)
[INFO] [stderr]     Checking n029_Divide_Two_Integers v0.1.0 (/opt/rustwide/workdir/n029_Divide_Two_Integers)
[INFO] [stderr]     Checking n030_Substring_with_Concatenation_of_All_Words v0.1.0 (/opt/rustwide/workdir/n030_Substring_with_Concatenation_of_All_Words)
[INFO] [stderr]     Checking n038_Count_and_Say v0.1.0 (/opt/rustwide/workdir/n038_Count_and_Say)
[INFO] [stderr]     Checking n046_Permutations v0.1.0 (/opt/rustwide/workdir/n046_Permutations)
[INFO] [stderr]     Checking n015_3Sum v0.1.0 (/opt/rustwide/workdir/n015_3Sum)
[INFO] [stderr]     Checking conditional_compiling v0.1.0 (/opt/rustwide/workdir/conditional_compiling)
[INFO] [stderr]     Checking n027_Remove_Element v0.1.0 (/opt/rustwide/workdir/n027_Remove_Element)
[INFO] [stderr]     Checking n033_Search_in_Rotated_Sorted_Array v0.1.0 (/opt/rustwide/workdir/n033_Search_in_Rotated_Sorted_Array)
[INFO] [stderr]     Checking n035_Search_Insert_Position v0.1.0 (/opt/rustwide/workdir/n035_Search_Insert_Position)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> etudes/src/util/mod.rs:153:11
[INFO] [stdout]     |
[INFO] [stdout] 153 |   let a: &TraitA = &StructA {};
[INFO] [stdout]     |           ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 153 |   let a: &dyn TraitA = &StructA {};
[INFO] [stdout]     |           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> Longest_Substring_Without_Repeating_Characters/src/main.rs:44:7
[INFO] [stdout]    |
[INFO] [stdout] 44 |   let s1 = "abcdefg";
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> Longest_Substring_Without_Repeating_Characters/src/main.rs:45:7
[INFO] [stdout]    |
[INFO] [stdout] 45 |   let s2 = "aaaaaaa";
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> Longest_Substring_Without_Repeating_Characters/src/main.rs:46:7
[INFO] [stdout]    |
[INFO] [stdout] 46 |   let s3 = "abcdaabc";
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> common/src/lib.rs:62:12
[INFO] [stdout]    |
[INFO] [stdout] 62 |         '1'...'9' => {
[INFO] [stdout]    |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> etudes/src/util/mod.rs:124:7
[INFO] [stdout]     |
[INFO] [stdout] 124 |   let mut a = Wrapper(&s);
[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: unused variable: `a`
[INFO] [stdout]    --> etudes/src/util/mod.rs:153:7
[INFO] [stdout]     |
[INFO] [stdout] 153 |   let a: &TraitA = &StructA {};
[INFO] [stdout]     |       ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `TraitB` is never used
[INFO] [stdout]    --> etudes/src/util/mod.rs:144:7
[INFO] [stdout]     |
[INFO] [stdout] 144 | trait TraitB: Sized {}
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `L` should have a snake case name
[INFO] [stdout]   --> n030_Substring_with_Concatenation_of_All_Words/src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let L = l * m;
[INFO] [stdout]    |         ^ help: convert the identifier to snake case: `l`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> n046_Permutations/src/main.rs:39:18
[INFO] [stdout]    |
[INFO] [stdout] 39 |         xs[i] %= (i+1);
[INFO] [stdout]    |                  ^   ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 39 -         xs[i] %= (i+1);
[INFO] [stdout] 39 +         xs[i] %= i+1;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> n046_Permutations/src/main.rs:39:18
[INFO] [stdout]    |
[INFO] [stdout] 39 |         xs[i] %= (i+1);
[INFO] [stdout]    |                  ^   ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 39 -         xs[i] %= (i+1);
[INFO] [stdout] 39 +         xs[i] %= i+1;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> n038_Count_and_Say/src/main.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let (mut a, mut b) = (&mut s, &mut s2);
[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]   --> n038_Count_and_Say/src/main.rs:11:17
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let (mut a, mut b) = (&mut s, &mut s2);
[INFO] [stdout]    |                 ----^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n013_Roman_to_Integer v0.1.0 (/opt/rustwide/workdir/n013_Roman_to_Integer)
[INFO] [stderr]     Checking n026_Remove_Duplicates_from_Sorted_Array v0.1.0 (/opt/rustwide/workdir/n026_Remove_Duplicates_from_Sorted_Array)
[INFO] [stderr]     Checking n039_Combination_Sum v0.1.0 (/opt/rustwide/workdir/n039_Combination_Sum)
[INFO] [stderr]     Checking Reverse_Integer v0.1.0 (/opt/rustwide/workdir/Reverse_Integer)
[INFO] [stderr]     Checking n016_3Sum_Closest v0.1.0 (/opt/rustwide/workdir/n016_3Sum_Closest)
[INFO] [stderr]     Checking n045_Jump_Game_II v0.1.0 (/opt/rustwide/workdir/n045_Jump_Game_II)
[INFO] [stderr]     Checking n041_First_Missing_Positive v0.1.0 (/opt/rustwide/workdir/n041_First_Missing_Positive)
[INFO] [stderr]     Checking Median_of_Two_Sorted_Arrays v0.1.0 (/opt/rustwide/workdir/Median_of_Two_Sorted_Arrays)
[INFO] [stderr]     Checking String_to_Integer v0.1.0 (/opt/rustwide/workdir/String_to_Integer)
[INFO] [stdout] warning: variable `max_i` is assigned to, but never used
[INFO] [stdout]  --> n041_First_Missing_Positive/src/main.rs:6:25
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let (mut min_i, mut max_i) = (0usize, 0usize);
[INFO] [stdout]   |                         ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_max_i` instead
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `max_i` is never read
[INFO] [stdout]   --> n041_First_Missing_Positive/src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         max_i = i;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> n026_Remove_Duplicates_from_Sorted_Array/src/main.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     return (i+1) as i32;
[INFO] [stdout]    |     ------------------- any code following this expression is unreachable
[INFO] [stdout] 25 |     return 0;
[INFO] [stdout]    |     ^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n036_Valid_Sudoku v0.1.0 (/opt/rustwide/workdir/n036_Valid_Sudoku)
[INFO] [stderr]     Checking n021_Merge_Two_Sorted_Lists v0.1.0 (/opt/rustwide/workdir/n021_Merge_Two_Sorted_Lists)
[INFO] [stderr]     Checking n019_Remove_Nth_Node_From_End_of_List v0.1.0 (/opt/rustwide/workdir/n019_Remove_Nth_Node_From_End_of_List)
[INFO] [stdout] warning: value assigned to `i` is never read
[INFO] [stdout]   --> n013_Roman_to_Integer/src/main.rs:98:7
[INFO] [stdout]    |
[INFO] [stdout] 98 |       i += advance;
[INFO] [stdout]    |       ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n025_Reverse_Nodes_in_k_Group v0.1.0 (/opt/rustwide/workdir/n025_Reverse_Nodes_in_k_Group)
[INFO] [stderr]     Checking n023_Merge_k_Sorted_Lists v0.1.0 (/opt/rustwide/workdir/n023_Merge_k_Sorted_Lists)
[INFO] [stderr]     Checking n024_Swap_Nodes_in_Pairs v0.1.0 (/opt/rustwide/workdir/n024_Swap_Nodes_in_Pairs)
[INFO] [stderr]     Checking n037_Sudoku_Solver v0.1.0 (/opt/rustwide/workdir/n037_Sudoku_Solver)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> n036_Valid_Sudoku/src/main.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |         '1'...'9' => {
[INFO] [stdout]    |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> n038_Count_and_Say/src/main.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let (mut a, mut b) = (&mut s, &mut s2);
[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]   --> n038_Count_and_Say/src/main.rs:11:17
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let (mut a, mut b) = (&mut s, &mut s2);
[INFO] [stdout]    |                 ----^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b0`
[INFO] [stdout]   --> n036_Valid_Sudoku/src/main.rs:79:7
[INFO] [stdout]    |
[INFO] [stdout] 79 |   let b0: Vec<Vec<char>> = sudoku::sudoku_from(b0);
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_b0`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]   --> n036_Valid_Sudoku/src/main.rs:92:7
[INFO] [stdout]    |
[INFO] [stdout] 92 |   let b1: Vec<Vec<char>> = sudoku::sudoku_from(b1);
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> n036_Valid_Sudoku/src/main.rs:106:7
[INFO] [stdout]     |
[INFO] [stdout] 106 |   let b2: Vec<Vec<char>> = sudoku::sudoku_from(b2);
[INFO] [stdout]     |       ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b3`
[INFO] [stdout]    --> n036_Valid_Sudoku/src/main.rs:118:7
[INFO] [stdout]     |
[INFO] [stdout] 118 |   let b3 = b3.iter().map(|&x|x.iter().map(|x|*x).collect::<Vec<char>>()).collect::<Vec<Vec<char>>>();
[INFO] [stdout]     |       ^^ help: if this is intentional, prefix it with an underscore: `_b3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_max` is never used
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:45:11
[INFO] [stdout]    |
[INFO] [stdout] 45 |     const i32_max: i32 = std::i32::MAX;
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_min` is never used
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:46:11
[INFO] [stdout]    |
[INFO] [stdout] 46 |     const i32_min: i32 = std::i32::MIN;
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking non_proc_macro v0.1.0 (/opt/rustwide/workdir/non_proc_macro)
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> Median_of_Two_Sorted_Arrays/src/main.rs:11:16
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert_eq!(0 <= k && k < a_len + b_len, true);
[INFO] [stdout]    |                ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_max` should have an upper case name
[INFO] [stdout]  --> Reverse_Integer/src/main.rs:6:11
[INFO] [stdout]   |
[INFO] [stdout] 6 |     const i32_max: i32 = std::i32::MAX;
[INFO] [stdout]   |           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] help: convert the identifier to upper case
[INFO] [stdout]   |
[INFO] [stdout] 6 -     const i32_max: i32 = std::i32::MAX;
[INFO] [stdout] 6 +     const I32_MAX: i32 = std::i32::MAX;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_min` should have an upper case name
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:26:11
[INFO] [stdout]    |
[INFO] [stdout] 26 |     const i32_min: i32 = std::i32::MIN;
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: convert the identifier to upper case
[INFO] [stdout]    |
[INFO] [stdout] 26 -     const i32_min: i32 = std::i32::MIN;
[INFO] [stdout] 26 +     const I32_MIN: i32 = std::i32::MIN;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_max` should have an upper case name
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:45:11
[INFO] [stdout]    |
[INFO] [stdout] 45 |     const i32_max: i32 = std::i32::MAX;
[INFO] [stdout]    |           ^^^^^^^ help: convert the identifier to upper case: `I32_MAX`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_min` should have an upper case name
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:46:11
[INFO] [stdout]    |
[INFO] [stdout] 46 |     const i32_min: i32 = std::i32::MIN;
[INFO] [stdout]    |           ^^^^^^^ help: convert the identifier to upper case: `I32_MIN`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]   --> n019_Remove_Nth_Node_From_End_of_List/src/main.rs:38:7
[INFO] [stdout]    |
[INFO] [stdout] 38 |   let l = ListNode::from(vec!(1,3,4,5,2));
[INFO] [stdout]    |       ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n050_Pow_x_n v0.1.0 (/opt/rustwide/workdir/n050_Pow_x_n)
[INFO] [stderr]     Checking n032_Longest_Valid_Parentheses v0.1.0 (/opt/rustwide/workdir/n032_Longest_Valid_Parentheses)
[INFO] [stdout] tk=pub
[INFO] [stdout] tk=struct
[INFO] [stdout] tk=AAA_struct
[INFO] [stdout] tk={ #[aaa_helper] pub a:i32 }
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> n036_Valid_Sudoku/src/main.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |         '1'...'9' => {
[INFO] [stdout]    |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n040_Combination_Sum_II v0.1.0 (/opt/rustwide/workdir/n040_Combination_Sum_II)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> n037_Sudoku_Solver/src/main.rs:72:18
[INFO] [stdout]    |
[INFO] [stdout] 72 |               '0'...'9' => {
[INFO] [stdout]    |                  ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::BinaryHeap`
[INFO] [stdout]   --> n037_Sudoku_Solver/src/main.rs:81:11
[INFO] [stdout]    |
[INFO] [stdout] 81 |       use std::collections::BinaryHeap;
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b0`
[INFO] [stdout]   --> n036_Valid_Sudoku/src/main.rs:79:7
[INFO] [stdout]    |
[INFO] [stdout] 79 |   let b0: Vec<Vec<char>> = sudoku::sudoku_from(b0);
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_b0`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]   --> n036_Valid_Sudoku/src/main.rs:92:7
[INFO] [stdout]    |
[INFO] [stdout] 92 |   let b1: Vec<Vec<char>> = sudoku::sudoku_from(b1);
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> n036_Valid_Sudoku/src/main.rs:106:7
[INFO] [stdout]     |
[INFO] [stdout] 106 |   let b2: Vec<Vec<char>> = sudoku::sudoku_from(b2);
[INFO] [stdout]     |       ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b3`
[INFO] [stdout]    --> n036_Valid_Sudoku/src/main.rs:118:7
[INFO] [stdout]     |
[INFO] [stdout] 118 |   let b3 = b3.iter().map(|&x|x.iter().map(|x|*x).collect::<Vec<char>>()).collect::<Vec<Vec<char>>>();
[INFO] [stdout]     |       ^^ help: if this is intentional, prefix it with an underscore: `_b3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] tk=pub
[INFO] [stdout] tk=struct
[INFO] [stdout] tk=AAA_struct
[INFO] [stdout] tk={ #[aaa_helper] pub a:i32 }
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]   --> n019_Remove_Nth_Node_From_End_of_List/src/main.rs:38:7
[INFO] [stdout]    |
[INFO] [stdout] 38 |   let l = ListNode::from(vec!(1,3,4,5,2));
[INFO] [stdout]    |       ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `AAA_struct` should have an upper camel case name
[INFO] [stdout]   --> non_proc_macro/src/util.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct AAA_struct{
[INFO] [stdout]    |            ^^^^^^^^^^ help: convert the identifier to upper camel case: `AaaStruct`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n049_Group_Anagrams v0.1.0 (/opt/rustwide/workdir/n049_Group_Anagrams)
[INFO] [stderr]     Checking n017_Letter_Combinations_of_a_Phone_Number v0.1.0 (/opt/rustwide/workdir/n017_Letter_Combinations_of_a_Phone_Number)
[INFO] [stdout] warning: type `AAA_struct` should have an upper camel case name
[INFO] [stdout]   --> non_proc_macro/src/util.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct AAA_struct{
[INFO] [stdout]    |            ^^^^^^^^^^ help: convert the identifier to upper camel case: `AaaStruct`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> n037_Sudoku_Solver/src/main.rs:72:18
[INFO] [stdout]    |
[INFO] [stdout] 72 |               '0'...'9' => {
[INFO] [stdout]    |                  ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::BinaryHeap`
[INFO] [stdout]   --> n037_Sudoku_Solver/src/main.rs:81:11
[INFO] [stdout]    |
[INFO] [stdout] 81 |       use std::collections::BinaryHeap;
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> n032_Longest_Valid_Parentheses/src/main.rs:18:17
[INFO] [stdout]    |
[INFO] [stdout] 18 |         (Some(&(k, 'M')), ')') => {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n042_Trapping_Rain_Water v0.1.0 (/opt/rustwide/workdir/n042_Trapping_Rain_Water)
[INFO] [stdout] warning: struct `Buzz` is never constructed
[INFO] [stdout]   --> non_proc_macro/src/util.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Buzz;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> n032_Longest_Valid_Parentheses/src/main.rs:12:15
[INFO] [stdout]    |
[INFO] [stdout] 12 |           let mut tmp = i + 1 - j;
[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]   --> n032_Longest_Valid_Parentheses/src/main.rs:23:19
[INFO] [stdout]    |
[INFO] [stdout] 23 |               let mut tmp = i + 1 - l;
[INFO] [stdout]    |                   ----^^^
[INFO] [stdout]    |                   |
[INFO] [stdout]    |                   help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n051_N_Queens v0.1.0 (/opt/rustwide/workdir/n051_N_Queens)
[INFO] [stderr]     Checking n018_4Sum v0.1.0 (/opt/rustwide/workdir/n018_4Sum)
[INFO] [stderr]     Checking ZigZag_Conversion v0.1.0 (/opt/rustwide/workdir/ZigZag_Conversion)
[INFO] [stderr]     Checking add_two_numbers v0.1.0 (/opt/rustwide/workdir/add_two_numbers)
[INFO] [stderr]     Checking n022_Generate_Parentheses v0.1.0 (/opt/rustwide/workdir/n022_Generate_Parentheses)
[INFO] [stdout] warning: unused variable: `b0`
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:197:11
[INFO] [stdout]     |
[INFO] [stdout] 197 |   let mut b0 = sudoku_from(b0);
[INFO] [stdout]     |           ^^ help: if this is intentional, prefix it with an underscore: `_b0`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b0`
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:197:11
[INFO] [stdout]     |
[INFO] [stdout] 197 |   let mut b0 = sudoku_from(b0);
[INFO] [stdout]     |           ^^ help: if this is intentional, prefix it with an underscore: `_b0`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:198:11
[INFO] [stdout]     |
[INFO] [stdout] 198 |   let mut b1 = sudoku_from(b1);
[INFO] [stdout]     |           ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:198:11
[INFO] [stdout]     |
[INFO] [stdout] 198 |   let mut b1 = sudoku_from(b1);
[INFO] [stdout]     |           ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:197:7
[INFO] [stdout]     |
[INFO] [stdout] 197 |   let mut b0 = sudoku_from(b0);
[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]    --> n037_Sudoku_Solver/src/main.rs:198:7
[INFO] [stdout]     |
[INFO] [stdout] 198 |   let mut b1 = sudoku_from(b1);
[INFO] [stdout]     |       ----^^
[INFO] [stdout]     |       |
[INFO] [stdout]     |       help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Pair` in this scope
[INFO] [stdout]  --> n051_N_Queens/src/main.rs:6:21
[INFO] [stdout]   |
[INFO] [stdout] 6 |   alternatives: Vec<Pair>
[INFO] [stdout]   |                     ^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: you might be missing a type parameter
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct StkElm<Pair> {
[INFO] [stdout]   |              ++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:197:7
[INFO] [stdout]     |
[INFO] [stdout] 197 |   let mut b0 = sudoku_from(b0);
[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]    --> n037_Sudoku_Solver/src/main.rs:198:7
[INFO] [stdout]     |
[INFO] [stdout] 198 |   let mut b1 = sudoku_from(b1);
[INFO] [stdout]     |       ----^^
[INFO] [stdout]     |       |
[INFO] [stdout]     |       help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `thread` and `time`
[INFO] [stdout]  --> n018_4Sum/src/main.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{thread,time};
[INFO] [stdout]   |           ^^^^^^ ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n047_Permutations_II v0.1.0 (/opt/rustwide/workdir/n047_Permutations_II)
[INFO] [stdout] warning: constant `i32_max` is never used
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:45:11
[INFO] [stdout]    |
[INFO] [stdout] 45 |     const i32_max: i32 = std::i32::MAX;
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_min` is never used
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:46:11
[INFO] [stdout]    |
[INFO] [stdout] 46 |     const i32_min: i32 = std::i32::MIN;
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_max` should have an upper case name
[INFO] [stdout]  --> Reverse_Integer/src/main.rs:6:11
[INFO] [stdout]   |
[INFO] [stdout] 6 |     const i32_max: i32 = std::i32::MAX;
[INFO] [stdout]   |           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] help: convert the identifier to upper case
[INFO] [stdout]   |
[INFO] [stdout] 6 -     const i32_max: i32 = std::i32::MAX;
[INFO] [stdout] 6 +     const I32_MAX: i32 = std::i32::MAX;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_min` should have an upper case name
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:26:11
[INFO] [stdout]    |
[INFO] [stdout] 26 |     const i32_min: i32 = std::i32::MIN;
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: convert the identifier to upper case
[INFO] [stdout]    |
[INFO] [stdout] 26 -     const i32_min: i32 = std::i32::MIN;
[INFO] [stdout] 26 +     const I32_MIN: i32 = std::i32::MIN;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_max` should have an upper case name
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:45:11
[INFO] [stdout]    |
[INFO] [stdout] 45 |     const i32_max: i32 = std::i32::MAX;
[INFO] [stdout]    |           ^^^^^^^ help: convert the identifier to upper case: `I32_MAX`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i32_min` should have an upper case name
[INFO] [stdout]   --> Reverse_Integer/src/main.rs:46:11
[INFO] [stdout]    |
[INFO] [stdout] 46 |     const i32_min: i32 = std::i32::MIN;
[INFO] [stdout]    |           ^^^^^^^ help: convert the identifier to upper case: `I32_MIN`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> ZigZag_Conversion/src/main.rs:59:7
[INFO] [stdout]    |
[INFO] [stdout] 59 |   let s1 = String::from("PAYPALISHIRING");
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> ZigZag_Conversion/src/main.rs:59:7
[INFO] [stdout]    |
[INFO] [stdout] 59 |   let s1 = String::from("PAYPALISHIRING");
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `n051_N_Queens` (bin "n051_N_Queens" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> n032_Longest_Valid_Parentheses/src/main.rs:18:17
[INFO] [stdout]    |
[INFO] [stdout] 18 |         (Some(&(k, 'M')), ')') => {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> n032_Longest_Valid_Parentheses/src/main.rs:12:15
[INFO] [stdout]    |
[INFO] [stdout] 12 |           let mut tmp = i + 1 - j;
[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]   --> n032_Longest_Valid_Parentheses/src/main.rs:23:19
[INFO] [stdout]    |
[INFO] [stdout] 23 |               let mut tmp = i + 1 - l;
[INFO] [stdout]    |                   ----^^^
[INFO] [stdout]    |                   |
[INFO] [stdout]    |                   help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `thread` and `time`
[INFO] [stdout]  --> n018_4Sum/src/main.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{thread,time};
[INFO] [stdout]   |           ^^^^^^ ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> add_two_numbers/src/main.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl ListNode {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 8 |   #[inline]
[INFO] [stdout] 9 |   fn new(val: i32) -> Self {
[INFO] [stdout]   |      ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vec2List` should have a snake case name
[INFO] [stdout]   --> add_two_numbers/src/main.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn vec2List(vals: Vec<i32>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |    ^^^^^^^^ help: convert the identifier to snake case: `vec2_list`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> etudes/src/util/mod.rs:153:11
[INFO] [stdout]     |
[INFO] [stdout] 153 |   let a: &TraitA = &StructA {};
[INFO] [stdout]     |           ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 153 |   let a: &dyn TraitA = &StructA {};
[INFO] [stdout]     |           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> Longest_Substring_Without_Repeating_Characters/src/main.rs:44:7
[INFO] [stdout]    |
[INFO] [stdout] 44 |   let s1 = "abcdefg";
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> Longest_Substring_Without_Repeating_Characters/src/main.rs:45:7
[INFO] [stdout]    |
[INFO] [stdout] 45 |   let s2 = "aaaaaaa";
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> Longest_Substring_Without_Repeating_Characters/src/main.rs:46:7
[INFO] [stdout]    |
[INFO] [stdout] 46 |   let s3 = "abcdaabc";
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> etudes/src/util/mod.rs:124:7
[INFO] [stdout]     |
[INFO] [stdout] 124 |   let mut a = Wrapper(&s);
[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: unused variable: `a`
[INFO] [stdout]    --> etudes/src/util/mod.rs:153:7
[INFO] [stdout]     |
[INFO] [stdout] 153 |   let a: &TraitA = &StructA {};
[INFO] [stdout]     |       ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `TraitB` is never used
[INFO] [stdout]    --> etudes/src/util/mod.rs:144:7
[INFO] [stdout]     |
[INFO] [stdout] 144 | trait TraitB: Sized {}
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "cfe5c37e7a40562e90bb165f1e1c0f612b79667229677bbcca86d1fbf37bb0e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cfe5c37e7a40562e90bb165f1e1c0f612b79667229677bbcca86d1fbf37bb0e3", kill_on_drop: false }`
[INFO] [stdout] cfe5c37e7a40562e90bb165f1e1c0f612b79667229677bbcca86d1fbf37bb0e3