[INFO] updating cached repository https://github.com/SuanFaRuoJi/coding_exercise_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fd2b45d72ffaebdb9a5e2f8b4fad7d3853f0afdd
[INFO] checking SuanFaRuoJi/coding_exercise_rust against master#1557fb031b272b4c5bfcc7de5df7eddc7b36a584 for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSuanFaRuoJi%2Fcoding_exercise_rust" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/SuanFaRuoJi/coding_exercise_rust on toolchain 1557fb031b272b4c5bfcc7de5df7eddc7b36a584
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/SuanFaRuoJi/coding_exercise_rust
[INFO] finished tweaking git repo https://github.com/SuanFaRuoJi/coding_exercise_rust
[INFO] tweaked toml for git repo https://github.com/SuanFaRuoJi/coding_exercise_rust written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/SuanFaRuoJi/coding_exercise_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ba889a5bbd34fd516c7310ded94feed5201c8bb6ff1d6eb2e86462e7a356c887
[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" "ba889a5bbd34fd516c7310ded94feed5201c8bb6ff1d6eb2e86462e7a356c887", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ba889a5bbd34fd516c7310ded94feed5201c8bb6ff1d6eb2e86462e7a356c887", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba889a5bbd34fd516c7310ded94feed5201c8bb6ff1d6eb2e86462e7a356c887", kill_on_drop: false }`
[INFO] [stdout] ba889a5bbd34fd516c7310ded94feed5201c8bb6ff1d6eb2e86462e7a356c887
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e52d43fdcaa6a0b925a2b7282618559c112091b0e6b369e93bfd9df99a03116b
[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" "e52d43fdcaa6a0b925a2b7282618559c112091b0e6b369e93bfd9df99a03116b", kill_on_drop: false }`
[INFO] [stderr]     Checking leetcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `fraction` should have an upper camel case name
[INFO] [stdout]   --> src/max_points_on_a_line_149.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct fraction {
[INFO] [stdout]    |        ^^^^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Fraction`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::TryInto`
[INFO] [stdout]  --> src/evaluate_reverse_polish_notation_150.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::TryInto;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::TryInto`
[INFO] [stdout]  --> src/valid_triangle_number_611.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::TryInto;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::TryInto`
[INFO] [stdout]  --> src/graph_valid_tree_261.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::TryInto;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::BorrowMut`
[INFO] [stdout]  --> src/shortest_word_distance_2_244.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/preorder_verification_255.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `fraction` should have an upper camel case name
[INFO] [stdout]   --> src/max_points_on_a_line_149.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct fraction {
[INFO] [stdout]    |        ^^^^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Fraction`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::TryInto`
[INFO] [stdout]  --> src/evaluate_reverse_polish_notation_150.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::TryInto;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::TryInto`
[INFO] [stdout]  --> src/valid_triangle_number_611.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::TryInto;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::TryInto`
[INFO] [stdout]  --> src/graph_valid_tree_261.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::TryInto;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::BorrowMut`
[INFO] [stdout]  --> src/shortest_word_distance_2_244.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/preorder_verification_255.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev`
[INFO] [stdout]   --> src/graph_valid_tree_261.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut prev = -1;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn inc(&mut self, key: String) {
[INFO] [stdout]    |                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:30:23
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn dec(&mut self, key: String) {
[INFO] [stdout]    |                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev`
[INFO] [stdout]   --> src/graph_valid_tree_261.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut prev = -1;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn inc(&mut self, key: String) {
[INFO] [stdout]    |                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:30:23
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn dec(&mut self, key: String) {
[INFO] [stdout]    |                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/graph_valid_tree_261.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut prev = -1;
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `backtrace`
[INFO] [stdout]   --> src/longest_palindrome_subsequence_516.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn backtrace(string: &Vec<i32>, left: usize, right: usize, dp: &mut Vec<Vec<i32>>) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `AllOne`
[INFO] [stdout]  --> src/all_O_one_data_structure_432.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct AllOne {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `inc`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn inc(&mut self, key: String) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `dec`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn dec(&mut self, key: String) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_max_key`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn get_max_key(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_min_key`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn get_min_key(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `all_O_one_data_structure_432` should have a snake case name
[INFO] [stdout]   --> src/lib.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub mod all_O_one_data_structure_432;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `all_o_one_data_structure_432`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/graph_valid_tree_261.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut prev = -1;
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `backtrace`
[INFO] [stdout]   --> src/longest_palindrome_subsequence_516.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn backtrace(string: &Vec<i32>, left: usize, right: usize, dp: &mut Vec<Vec<i32>>) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `AllOne`
[INFO] [stdout]  --> src/all_O_one_data_structure_432.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct AllOne {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `inc`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn inc(&mut self, key: String) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `dec`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn dec(&mut self, key: String) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_max_key`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn get_max_key(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_min_key`
[INFO] [stdout]   --> src/all_O_one_data_structure_432.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn get_min_key(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `all_O_one_data_structure_432` should have a snake case name
[INFO] [stdout]   --> src/lib.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub mod all_O_one_data_structure_432;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `all_o_one_data_structure_432`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "e52d43fdcaa6a0b925a2b7282618559c112091b0e6b369e93bfd9df99a03116b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e52d43fdcaa6a0b925a2b7282618559c112091b0e6b369e93bfd9df99a03116b", kill_on_drop: false }`
[INFO] [stdout] e52d43fdcaa6a0b925a2b7282618559c112091b0e6b369e93bfd9df99a03116b