[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] building shakesbeare/leet-code against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshakesbeare%2Fleet-code" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shakesbeare/leet-code on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-3-tc1/source/Cargo.toml
[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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0dd92b1f9c75edf38fcc08a92e6547f9a207aeb7e4c34b6a34f46d95ae951e60
[INFO] running `Command { std: "docker" "start" "-a" "0dd92b1f9c75edf38fcc08a92e6547f9a207aeb7e4c34b6a34f46d95ae951e60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0dd92b1f9c75edf38fcc08a92e6547f9a207aeb7e4c34b6a34f46d95ae951e60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0dd92b1f9c75edf38fcc08a92e6547f9a207aeb7e4c34b6a34f46d95ae951e60", kill_on_drop: false }`
[INFO] [stdout] 0dd92b1f9c75edf38fcc08a92e6547f9a207aeb7e4c34b6a34f46d95ae951e60
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4bc1d3f138ee64c5490c15d78a37dfc6f543d7b286deee2d6410a06fa901bd85
[INFO] running `Command { std: "docker" "start" "-a" "4bc1d3f138ee64c5490c15d78a37dfc6f543d7b286deee2d6410a06fa901bd85", kill_on_drop: false }`
[INFO] [stderr]    Compiling regular_expression_matching v0.1.0 (/opt/rustwide/workdir/regular_expression_matching)
[INFO] [stderr]    Compiling valid_parentheses v0.1.0 (/opt/rustwide/workdir/valid_parentheses)
[INFO] [stderr]    Compiling longest_common_prefix v0.1.0 (/opt/rustwide/workdir/longest_common_prefix)
[INFO] [stderr]    Compiling roman_to_integer v0.1.0 (/opt/rustwide/workdir/roman_to_integer)
[INFO] [stdout] warning: unused variable: `p_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:7:17
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:8:17
[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: 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)]` 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: 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)]` 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: 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]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] running `Command { std: "docker" "inspect" "4bc1d3f138ee64c5490c15d78a37dfc6f543d7b286deee2d6410a06fa901bd85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bc1d3f138ee64c5490c15d78a37dfc6f543d7b286deee2d6410a06fa901bd85", kill_on_drop: false }`
[INFO] [stdout] 4bc1d3f138ee64c5490c15d78a37dfc6f543d7b286deee2d6410a06fa901bd85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 086fa72e1296e43914f6d50dfeb04ac7827d8081cf03b01fc0f1d64411df5e87
[INFO] running `Command { std: "docker" "start" "-a" "086fa72e1296e43914f6d50dfeb04ac7827d8081cf03b01fc0f1d64411df5e87", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `p_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:7:17
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:8:17
[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: 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)]` 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: 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)]` 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] [stderr]    Compiling longest_common_prefix v0.1.0 (/opt/rustwide/workdir/longest_common_prefix)
[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]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling valid_parentheses v0.1.0 (/opt/rustwide/workdir/valid_parentheses)
[INFO] [stderr]    Compiling roman_to_integer v0.1.0 (/opt/rustwide/workdir/roman_to_integer)
[INFO] [stderr]    Compiling 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)]` 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: 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]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:7:17
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_iter`
[INFO] [stdout]  --> regular_expression_matching/src/lib.rs:8:17
[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: 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)]` 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] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "086fa72e1296e43914f6d50dfeb04ac7827d8081cf03b01fc0f1d64411df5e87", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "086fa72e1296e43914f6d50dfeb04ac7827d8081cf03b01fc0f1d64411df5e87", kill_on_drop: false }`
[INFO] [stdout] 086fa72e1296e43914f6d50dfeb04ac7827d8081cf03b01fc0f1d64411df5e87