[INFO] cloning repository https://github.com/shakesbeare/leet-code
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shakesbeare/leet-code" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshakesbeare%2Fleet-code", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshakesbeare%2Fleet-code'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2dc6fc1aa27f2312281ad8023623e538a411ea9c
[INFO] checking shakesbeare/leet-code against master#1fe72d35998dea48aeecaf7fc07783b0b553f24f for pr-154992-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshakesbeare%2Fleet-code" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/shakesbeare/leet-code
[INFO] finished tweaking git repo https://github.com/shakesbeare/leet-code
[INFO] tweaked toml for git repo https://github.com/shakesbeare/leet-code written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/shakesbeare/leet-code on toolchain 1fe72d35998dea48aeecaf7fc07783b0b553f24f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1fe72d35998dea48aeecaf7fc07783b0b553f24f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/shakesbeare/leet-code 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" "+1fe72d35998dea48aeecaf7fc07783b0b553f24f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1fe72d35998dea48aeecaf7fc07783b0b553f24f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c66d6c02febd30df3e9fcb27756b71161224dd72318f8720068e4ddf92e63aa9
[INFO] running `Command { std: "docker" "start" "-a" "c66d6c02febd30df3e9fcb27756b71161224dd72318f8720068e4ddf92e63aa9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c66d6c02febd30df3e9fcb27756b71161224dd72318f8720068e4ddf92e63aa9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c66d6c02febd30df3e9fcb27756b71161224dd72318f8720068e4ddf92e63aa9", kill_on_drop: false }`
[INFO] [stdout] c66d6c02febd30df3e9fcb27756b71161224dd72318f8720068e4ddf92e63aa9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1fe72d35998dea48aeecaf7fc07783b0b553f24f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c22c2eeeec54d6d4953f95b90d3c52f044beb9e4c912fc337156bf6ea17c0514
[INFO] running `Command { std: "docker" "start" "-a" "c22c2eeeec54d6d4953f95b90d3c52f044beb9e4c912fc337156bf6ea17c0514", kill_on_drop: false }`
[INFO] [stderr]     Checking valid_parentheses v0.1.0 (/opt/rustwide/workdir/valid_parentheses)
[INFO] [stderr]     Checking longest_common_prefix v0.1.0 (/opt/rustwide/workdir/longest_common_prefix)
[INFO] [stderr]     Checking roman_to_integer v0.1.0 (/opt/rustwide/workdir/roman_to_integer)
[INFO] [stderr]     Checking regular_expression_matching v0.1.0 (/opt/rustwide/workdir/regular_expression_matching)
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> longest_common_prefix/src/lib.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `longest_common_prefix` is never used
[INFO] [stdout]  --> longest_common_prefix/src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |     pub fn longest_common_prefix(strs: Vec<String>) -> String {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |         let mut p_iter = p.chars().peekable();
[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]  --> regular_expression_matching/src/lib.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |         let mut s_iter = s.chars();
[INFO] [stdout]   |             ----^^^^^^
[INFO] [stdout]   |             |
[INFO] [stdout]   |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |         let mut p_iter = p.chars().peekable();
[INFO] [stdout]   |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_p_iter`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |         let mut s_iter = s.chars();
[INFO] [stdout]   |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> longest_common_prefix/src/lib.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `longest_common_prefix` is never used
[INFO] [stdout]  --> longest_common_prefix/src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |     pub fn longest_common_prefix(strs: Vec<String>) -> String {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Delimiter` is never used
[INFO] [stdout]  --> valid_parentheses/src/lib.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Delimiter {
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_valid` is never used
[INFO] [stdout]   --> valid_parentheses/src/lib.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 22 |     fn is_valid(s: String) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Delimiter` is never used
[INFO] [stdout]  --> valid_parentheses/src/lib.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Delimiter {
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_valid` is never used
[INFO] [stdout]   --> valid_parentheses/src/lib.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 22 |     fn is_valid(s: String) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |         let mut p_iter = p.chars().peekable();
[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]  --> regular_expression_matching/src/lib.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |         let mut s_iter = s.chars();
[INFO] [stdout]   |             ----^^^^^^
[INFO] [stdout]   |             |
[INFO] [stdout]   |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |         let mut p_iter = p.chars().peekable();
[INFO] [stdout]   |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_p_iter`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |         let mut s_iter = s.chars();
[INFO] [stdout]   |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "c22c2eeeec54d6d4953f95b90d3c52f044beb9e4c912fc337156bf6ea17c0514", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c22c2eeeec54d6d4953f95b90d3c52f044beb9e4c912fc337156bf6ea17c0514", kill_on_drop: false }`
[INFO] [stdout] c22c2eeeec54d6d4953f95b90d3c52f044beb9e4c912fc337156bf6ea17c0514
