[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 against try#446cb600aa4837dd6c513f14fa0d25a909b177d7 for pr-149195
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsatanson%2Frust_etudes" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/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-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/satanson/rust_etudes on toolchain 446cb600aa4837dd6c513f14fa0d25a909b177d7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+446cb600aa4837dd6c513f14fa0d25a909b177d7" "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" "+446cb600aa4837dd6c513f14fa0d25a909b177d7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: /workspace/builds/worker-5-tc2/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-5-tc2/source/my_proc_macro/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+446cb600aa4837dd6c513f14fa0d25a909b177d7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 55445f63bb35c1d60d1f7b3110239403aa652b4214e9f872e9679a9d4caee8ab
[INFO] running `Command { std: "docker" "start" "-a" "55445f63bb35c1d60d1f7b3110239403aa652b4214e9f872e9679a9d4caee8ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "55445f63bb35c1d60d1f7b3110239403aa652b4214e9f872e9679a9d4caee8ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "55445f63bb35c1d60d1f7b3110239403aa652b4214e9f872e9679a9d4caee8ab", kill_on_drop: false }`
[INFO] [stdout] 55445f63bb35c1d60d1f7b3110239403aa652b4214e9f872e9679a9d4caee8ab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+446cb600aa4837dd6c513f14fa0d25a909b177d7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4094c643fc7b788517ebc788f149fd7c6aa005d099c46307adfa99d0ac674b0
[INFO] running `Command { std: "docker" "start" "-a" "e4094c643fc7b788517ebc788f149fd7c6aa005d099c46307adfa99d0ac674b0", kill_on_drop: false }`
[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] warning: /opt/rustwide/workdir/my_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 n020_Valid_Parentheses v0.1.0 (/opt/rustwide/workdir/n020_Valid_Parentheses)
[INFO] [stderr]     Checking n038_Count_and_Say v0.1.0 (/opt/rustwide/workdir/n038_Count_and_Say)
[INFO] [stderr]     Checking Longest_Palindromic_Substring v0.1.0 (/opt/rustwide/workdir/Longest_Palindromic_Substring)
[INFO] [stderr]     Checking n018_4Sum v0.1.0 (/opt/rustwide/workdir/n018_4Sum)
[INFO] [stderr]     Checking n033_Search_in_Rotated_Sorted_Array v0.1.0 (/opt/rustwide/workdir/n033_Search_in_Rotated_Sorted_Array)
[INFO] [stderr]     Checking n040_Combination_Sum_II v0.1.0 (/opt/rustwide/workdir/n040_Combination_Sum_II)
[INFO] [stderr]     Checking n043_Multiply_Strings v0.1.0 (/opt/rustwide/workdir/n043_Multiply_Strings)
[INFO] [stderr]     Checking n017_Letter_Combinations_of_a_Phone_Number v0.1.0 (/opt/rustwide/workdir/n017_Letter_Combinations_of_a_Phone_Number)
[INFO] [stderr]     Checking n028_Implement_strStr v0.1.0 (/opt/rustwide/workdir/n028_Implement_strStr)
[INFO] [stderr]     Checking Regular_Expression_Matching v0.1.0 (/opt/rustwide/workdir/Regular_Expression_Matching)
[INFO] [stderr]     Checking n012_Integer_to_Roman v0.1.0 (/opt/rustwide/workdir/n012_Integer_to_Roman)
[INFO] [stderr]     Checking Median_of_Two_Sorted_Arrays v0.1.0 (/opt/rustwide/workdir/Median_of_Two_Sorted_Arrays)
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> Longest_Palindromic_Substring/src/main.rs:82:7
[INFO] [stdout]    |
[INFO] [stdout] 82 |   let s1 = String::from("eabaf");
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `lcs` is never used
[INFO] [stdout]  --> Longest_Palindromic_Substring/src/main.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |   pub fn lcs(s1: &String, s2: &String) -> (usize, usize) {
[INFO] [stdout]   |          ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> Regular_Expression_Matching/src/main.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |         return false;
[INFO] [stdout]    |         ------------ any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 79 |     return false;
[INFO] [stdout]    |     ^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking String_to_Integer v0.1.0 (/opt/rustwide/workdir/String_to_Integer)
[INFO] [stderr]     Checking n032_Longest_Valid_Parentheses v0.1.0 (/opt/rustwide/workdir/n032_Longest_Valid_Parentheses)
[INFO] [stderr]     Checking two_sum v0.1.0 (/opt/rustwide/workdir/two_sum)
[INFO] [stderr]     Checking n023_Merge_k_Sorted_Lists v0.1.0 (/opt/rustwide/workdir/n023_Merge_k_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] [stderr]     Checking n036_Valid_Sudoku v0.1.0 (/opt/rustwide/workdir/n036_Valid_Sudoku)
[INFO] [stderr]     Checking n025_Reverse_Nodes_in_k_Group v0.1.0 (/opt/rustwide/workdir/n025_Reverse_Nodes_in_k_Group)
[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: 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)]` (part of `#[warn(unused)]`) 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: variable does not need to be mutable
[INFO] [stdout]   --> n043_Multiply_Strings/src/main.rs:25:11
[INFO] [stdout]    |
[INFO] [stdout] 25 |       let mut m = k + a.len();
[INFO] [stdout]    |           ----^
[INFO] [stdout]    |           |
[INFO] [stdout]    |           help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[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: 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)]` (part of `#[warn(unused)]`) 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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) 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: `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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> n043_Multiply_Strings/src/main.rs:25:11
[INFO] [stdout]    |
[INFO] [stdout] 25 |       let mut m = k + a.len();
[INFO] [stdout]    |           ----^
[INFO] [stdout]    |           |
[INFO] [stdout]    |           help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around closure body
[INFO] [stdout]   --> n037_Sudoku_Solver/src/main.rs:52:18
[INFO] [stdout]    |
[INFO] [stdout] 52 |     .filter(|&i| ((1 & !(x >> i)) == 1))
[INFO] [stdout]    |                  ^                    ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 52 -     .filter(|&i| ((1 & !(x >> i)) == 1))
[INFO] [stdout] 52 +     .filter(|&i| (1 & !(x >> i)) == 1 )
[INFO] [stdout]    |
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` (part of `#[warn(rust_2021_compatibility)]`) 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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n021_Merge_Two_Sorted_Lists v0.1.0 (/opt/rustwide/workdir/n021_Merge_Two_Sorted_Lists)
[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)]` (part of `#[warn(unused)]`) 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 variable: `b0`
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:197:7
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:198:7
[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] [stderr]     Checking non_proc_macro v0.1.0 (/opt/rustwide/workdir/non_proc_macro)
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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 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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n011_Container_With_Most_Water v0.1.0 (/opt/rustwide/workdir/n011_Container_With_Most_Water)
[INFO] [stdout] warning: unnecessary parentheses around closure body
[INFO] [stdout]   --> n037_Sudoku_Solver/src/main.rs:52:18
[INFO] [stdout]    |
[INFO] [stdout] 52 |     .filter(|&i| ((1 & !(x >> i)) == 1))
[INFO] [stdout]    |                  ^                    ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 52 -     .filter(|&i| ((1 & !(x >> i)) == 1))
[INFO] [stdout] 52 +     .filter(|&i| (1 & !(x >> i)) == 1 )
[INFO] [stdout]    |
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` (part of `#[warn(rust_2021_compatibility)]`) 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)]` (part of `#[warn(unused)]`) on by default
[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: 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)]` (part of `#[warn(nonstandard_style)]`) 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)]` (part of `#[warn(unused)]`) 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] [stderr]     Checking n045_Jump_Game_II v0.1.0 (/opt/rustwide/workdir/n045_Jump_Game_II)
[INFO] [stderr]     Checking n034_Find_First_and_Last_Position_of_Element_in_Sorted_Array v0.1.0 (/opt/rustwide/workdir/n034_Find_First_and_Last_Position_of_Element_in_Sorted_Array)
[INFO] [stderr]     Checking n050_Pow_x_n v0.1.0 (/opt/rustwide/workdir/n050_Pow_x_n)
[INFO] [stdout] tk=pub
[INFO] [stdout] tk=struct
[INFO] [stdout] tk=AAA_struct
[INFO] [stdout] tk={ #[aaa_helper] pub a:i32 }
[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)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BuzzIter` is never constructed
[INFO] [stdout]   --> non_proc_macro/src/util.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct BuzzIter {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking Palindrome_Number v0.1.0 (/opt/rustwide/workdir/Palindrome_Number)
[INFO] [stderr]     Checking n014_Longest_Common_Prefix v0.1.0 (/opt/rustwide/workdir/n014_Longest_Common_Prefix)
[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)]` (part of `#[warn(unused)]`) 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: 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)]` (part of `#[warn(unused)]`) 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 variable: `b0`
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:197:7
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> n037_Sudoku_Solver/src/main.rs:198:7
[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 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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n039_Combination_Sum v0.1.0 (/opt/rustwide/workdir/n039_Combination_Sum)
[INFO] [stderr]     Checking n016_3Sum_Closest v0.1.0 (/opt/rustwide/workdir/n016_3Sum_Closest)
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> Longest_Palindromic_Substring/src/main.rs:82:7
[INFO] [stdout]    |
[INFO] [stdout] 82 |   let s1 = String::from("eabaf");
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `lcs` is never used
[INFO] [stdout]  --> Longest_Palindromic_Substring/src/main.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |   pub fn lcs(s1: &String, s2: &String) -> (usize, usize) {
[INFO] [stdout]   |          ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) 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] [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 n051_N_Queens v0.1.0 (/opt/rustwide/workdir/n051_N_Queens)
[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 n048_Rotate_Image v0.1.0 (/opt/rustwide/workdir/n048_Rotate_Image)
[INFO] [stderr]     Checking n046_Permutations v0.1.0 (/opt/rustwide/workdir/n046_Permutations)
[INFO] [stderr]     Checking n029_Divide_Two_Integers v0.1.0 (/opt/rustwide/workdir/n029_Divide_Two_Integers)
[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: 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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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: 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)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking n049_Group_Anagrams v0.1.0 (/opt/rustwide/workdir/n049_Group_Anagrams)
[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] [stderr]     Checking n015_3Sum v0.1.0 (/opt/rustwide/workdir/n015_3Sum)
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) 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] [stderr] error: could not compile `n051_N_Queens` (bin "n051_N_Queens") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0412`.
[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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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 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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(unused)]`) 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: 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)]` (part of `#[warn(unused)]`) 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)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "e4094c643fc7b788517ebc788f149fd7c6aa005d099c46307adfa99d0ac674b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4094c643fc7b788517ebc788f149fd7c6aa005d099c46307adfa99d0ac674b0", kill_on_drop: false }`
[INFO] [stdout] e4094c643fc7b788517ebc788f149fd7c6aa005d099c46307adfa99d0ac674b0
