[INFO] cloning repository https://github.com/0xksure/rust-interview-prep
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/0xksure/rust-interview-prep" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F0xksure%2Frust-interview-prep", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F0xksure%2Frust-interview-prep'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ef2bc53a1fac1ddd19d380413da1b075ca9e3573
[INFO] checking 0xksure/rust-interview-prep against master#c8551d3c63c51f290cf1dc9dc4714249ea849fd1 for pr-148946
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F0xksure%2Frust-interview-prep" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/0xksure/rust-interview-prep
[INFO] finished tweaking git repo https://github.com/0xksure/rust-interview-prep
[INFO] tweaked toml for git repo https://github.com/0xksure/rust-interview-prep written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/0xksure/rust-interview-prep on toolchain c8551d3c63c51f290cf1dc9dc4714249ea849fd1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c8551d3c63c51f290cf1dc9dc4714249ea849fd1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/0xksure/rust-interview-prep 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" "+c8551d3c63c51f290cf1dc9dc4714249ea849fd1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded getrandom v0.2.6
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.16
[INFO] [stderr]   Downloaded libc v0.2.125
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+c8551d3c63c51f290cf1dc9dc4714249ea849fd1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7101232abac167ab5b03dfd7a499e2581298d23aaacc64996d3b7e19879e5ad8
[INFO] running `Command { std: "docker" "start" "-a" "7101232abac167ab5b03dfd7a499e2581298d23aaacc64996d3b7e19879e5ad8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7101232abac167ab5b03dfd7a499e2581298d23aaacc64996d3b7e19879e5ad8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7101232abac167ab5b03dfd7a499e2581298d23aaacc64996d3b7e19879e5ad8", kill_on_drop: false }`
[INFO] [stdout] 7101232abac167ab5b03dfd7a499e2581298d23aaacc64996d3b7e19879e5ad8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+c8551d3c63c51f290cf1dc9dc4714249ea849fd1" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84eb5f1b9b3ffe123798eefce76557aac849115a3688ce7344729d2d0314308b
[INFO] running `Command { std: "docker" "start" "-a" "84eb5f1b9b3ffe123798eefce76557aac849115a3688ce7344729d2d0314308b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.125
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking rust-interview-prep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rand::prelude::*`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::prelude::*;
[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 import: `std::ops::BitXor`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::BitXor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `fmt::format` and `hash::Hash`
[INFO] [stdout]  --> src/algorithms/mod.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt::format, hash::Hash};
[INFO] [stdout]   |           ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::Ref`
[INFO] [stdout]  --> src/lifetimes.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::Ref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::prelude::*`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::prelude::*;
[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 import: `std::ops::BitXor`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::BitXor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `fmt::format` and `hash::Hash`
[INFO] [stdout]  --> src/algorithms/mod.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt::format, hash::Hash};
[INFO] [stdout]   |           ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::Ref`
[INFO] [stdout]  --> src/lifetimes.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::Ref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `new_string`
[INFO] [stdout]   --> src/lifetimes.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let new_string = longest(&string1, &string2);
[INFO] [stdout]    |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_string`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reference_struct`
[INFO] [stdout]   --> src/lifetimes.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let reference_struct = ReferenceStruct {
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference_struct`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_box`
[INFO] [stdout]  --> src/smart_pointers.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let some_box = Box::new(5);
[INFO] [stdout]   |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_box`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `hash` is never read
[INFO] [stdout]  --> src/algorithms/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct HashItem<U, T> {
[INFO] [stdout]   |            -------- field in this struct
[INFO] [stdout] 8 |     hash: U,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `string1` is never read
[INFO] [stdout]  --> src/lifetimes.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct ReferenceStruct<'a> {
[INFO] [stdout]   |        --------------- field in this struct
[INFO] [stdout] 4 |     pub string1: &'a str,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `new_string`
[INFO] [stdout]   --> src/lifetimes.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let new_string = longest(&string1, &string2);
[INFO] [stdout]    |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_string`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reference_struct`
[INFO] [stdout]   --> src/lifetimes.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let reference_struct = ReferenceStruct {
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference_struct`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_box`
[INFO] [stdout]  --> src/smart_pointers.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let some_box = Box::new(5);
[INFO] [stdout]   |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_box`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `hash` is never read
[INFO] [stdout]  --> src/algorithms/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct HashItem<U, T> {
[INFO] [stdout]   |            -------- field in this struct
[INFO] [stdout] 8 |     hash: U,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `string1` is never read
[INFO] [stdout]  --> src/lifetimes.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct ReferenceStruct<'a> {
[INFO] [stdout]   |        --------------- field in this struct
[INFO] [stdout] 4 |     pub string1: &'a str,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.10s
[INFO] running `Command { std: "docker" "inspect" "84eb5f1b9b3ffe123798eefce76557aac849115a3688ce7344729d2d0314308b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84eb5f1b9b3ffe123798eefce76557aac849115a3688ce7344729d2d0314308b", kill_on_drop: false }`
[INFO] [stdout] 84eb5f1b9b3ffe123798eefce76557aac849115a3688ce7344729d2d0314308b
