[INFO] cloning repository https://github.com/coldGui/rustlings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/coldGui/rustlings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcoldGui%2Frustlings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcoldGui%2Frustlings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d49794588dcb6664a4fb022306da11b1dc67ea9e
[INFO] checking coldGui/rustlings/d49794588dcb6664a4fb022306da11b1dc67ea9e against master#f5711a55f5d5e2f942057d0f6d648dd2d8b2c37b for pr-148329
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcoldGui%2Frustlings" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/coldGui/rustlings
[INFO] finished tweaking git repo https://github.com/coldGui/rustlings
[INFO] tweaked toml for git repo https://github.com/coldGui/rustlings written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/coldGui/rustlings on toolchain f5711a55f5d5e2f942057d0f6d648dd2d8b2c37b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f5711a55f5d5e2f942057d0f6d648dd2d8b2c37b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/coldGui/rustlings 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" "+f5711a55f5d5e2f942057d0f6d648dd2d8b2c37b" "fetch" "--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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+f5711a55f5d5e2f942057d0f6d648dd2d8b2c37b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9b1bbd3a8e2bc2c4b8432cf0b73784b38b2bff06f0217d9aa4defb4262adb001
[INFO] running `Command { std: "docker" "start" "-a" "9b1bbd3a8e2bc2c4b8432cf0b73784b38b2bff06f0217d9aa4defb4262adb001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9b1bbd3a8e2bc2c4b8432cf0b73784b38b2bff06f0217d9aa4defb4262adb001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b1bbd3a8e2bc2c4b8432cf0b73784b38b2bff06f0217d9aa4defb4262adb001", kill_on_drop: false }`
[INFO] [stdout] 9b1bbd3a8e2bc2c4b8432cf0b73784b38b2bff06f0217d9aa4defb4262adb001
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+f5711a55f5d5e2f942057d0f6d648dd2d8b2c37b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 97bb70f36c66e61e1cd6cdd28fc1a757edff5a02d4bf826a4fdbb244eb76cc5a
[INFO] running `Command { std: "docker" "start" "-a" "97bb70f36c66e61e1cd6cdd28fc1a757edff5a02d4bf826a4fdbb244eb76cc5a", kill_on_drop: false }`
[INFO] [stderr]     Checking exercises v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::ParsePersonError::ParseInt`
[INFO] [stdout]   --> exercises/23_conversions/from_str.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::ParsePersonError::ParseInt;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc` and `Mutex`
[INFO] [stdout]  --> exercises/20_threads/threads3.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                 ^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> exercises/23_conversions/from_into.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |         if (a.len() != 2 || a[0] == "" || a[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 -         if (a.len() != 2 || a[0] == "" || a[1] == "") {
[INFO] [stdout] 39 +         if a.len() != 2 || a[0] == "" || a[1] == "" {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc` and `Mutex`
[INFO] [stdout]  --> exercises/20_threads/threads3.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                 ^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]   --> exercises/04_primitive_types/primitive_types6.rs:14:14
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let (first,second,third) = numbers;
[INFO] [stdout]    |              ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `third`
[INFO] [stdout]   --> exercises/04_primitive_types/primitive_types6.rs:14:27
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let (first,second,third) = numbers;
[INFO] [stdout]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_third`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> exercises/18_iterators/iterators5.rs:31:31
[INFO] [stdout]    |
[INFO] [stdout] 31 |     map.iter().fold(0, |acc, (k, v)| {
[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: `k`
[INFO] [stdout]   --> exercises/18_iterators/iterators5.rs:31:31
[INFO] [stdout]    |
[INFO] [stdout] 31 |     map.iter().fold(0, |acc, (k, v)| {
[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: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> exercises/23_conversions/from_into.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |         if (a.len() != 2 || a[0] == "" || a[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 -         if (a.len() != 2 || a[0] == "" || a[1] == "") {
[INFO] [stdout] 39 +         if a.len() != 2 || a[0] == "" || a[1] == "" {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.74s
[INFO] running `Command { std: "docker" "inspect" "97bb70f36c66e61e1cd6cdd28fc1a757edff5a02d4bf826a4fdbb244eb76cc5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97bb70f36c66e61e1cd6cdd28fc1a757edff5a02d4bf826a4fdbb244eb76cc5a", kill_on_drop: false }`
[INFO] [stdout] 97bb70f36c66e61e1cd6cdd28fc1a757edff5a02d4bf826a4fdbb244eb76cc5a