[INFO] cloning repository https://github.com/vikyathshirva/AlgoWorkoutInRust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vikyathshirva/AlgoWorkoutInRust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvikyathshirva%2FAlgoWorkoutInRust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvikyathshirva%2FAlgoWorkoutInRust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 258436dd9df4b8f1250927e5c6cf4871642a2cbe
[INFO] checking vikyathshirva/AlgoWorkoutInRust against try#f77b5bc6c7c84df104f86b0dd01d9490e3923fa8 for pr-147834
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvikyathshirva%2FAlgoWorkoutInRust" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/vikyathshirva/AlgoWorkoutInRust
[INFO] finished tweaking git repo https://github.com/vikyathshirva/AlgoWorkoutInRust
[INFO] tweaked toml for git repo https://github.com/vikyathshirva/AlgoWorkoutInRust written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/vikyathshirva/AlgoWorkoutInRust on toolchain f77b5bc6c7c84df104f86b0dd01d9490e3923fa8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/vikyathshirva/AlgoWorkoutInRust 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" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 47be24419172da94e38340c7d0a2384f8fce236da9fc08e3c4e3911fdc805a67
[INFO] running `Command { std: "docker" "start" "-a" "47be24419172da94e38340c7d0a2384f8fce236da9fc08e3c4e3911fdc805a67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47be24419172da94e38340c7d0a2384f8fce236da9fc08e3c4e3911fdc805a67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47be24419172da94e38340c7d0a2384f8fce236da9fc08e3c4e3911fdc805a67", kill_on_drop: false }`
[INFO] [stdout] 47be24419172da94e38340c7d0a2384f8fce236da9fc08e3c4e3911fdc805a67
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 88f57540847fd013e579e34a7e8ab241dffe3c9a5b0bf035a31008abe0e9fbc5
[INFO] running `Command { std: "docker" "start" "-a" "88f57540847fd013e579e34a7e8ab241dffe3c9a5b0bf035a31008abe0e9fbc5", kill_on_drop: false }`
[INFO] [stderr]     Checking AlgoWorkoutInRust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `env::current_exe`
[INFO] [stdout]  --> src/linked_list/DoublyLinkedList.rs:1:26
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{cell::RefCell, env::current_exe, rc::Rc};
[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: `env::current_exe`
[INFO] [stdout]  --> src/linked_list/DoublyLinkedList.rs:1:26
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{cell::RefCell, env::current_exe, rc::Rc};
[INFO] [stdout]   |                          ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/linked_list/DoublyLinkedList.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl ListIterator {
[INFO] [stdout]    | ----------------- associated function in this implementation
[INFO] [stdout] 11 |     fn new(start_at: Link) -> ListIterator {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `head` and `tail` are never read
[INFO] [stdout]   --> src/linked_list/DoublyLinkedList.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub struct BetterTransactionLog {
[INFO] [stdout]    |            -------------------- fields in this struct
[INFO] [stdout] 66 |     head: Link,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 67 |     tail: Link,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BetterTransactionLog` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `AlgoWorkoutInRust` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = help: convert the identifier to snake case: `algo_workout_in_rust`
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `LinkedList` should have a snake case name
[INFO] [stdout]  --> src/linked_list/mod.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub mod LinkedList;
[INFO] [stdout]   |         ^^^^^^^^^^ help: convert the identifier to snake case: `linked_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `DoublyLinkedList` should have a snake case name
[INFO] [stdout]  --> src/linked_list/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub mod DoublyLinkedList;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `doubly_linked_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_pop` is never used
[INFO] [stdout]   --> src/linked_list/tests.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn test_pop() {
[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 `new` is never used
[INFO] [stdout]   --> src/linked_list/DoublyLinkedList.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl ListIterator {
[INFO] [stdout]    | ----------------- associated function in this implementation
[INFO] [stdout] 11 |     fn new(start_at: Link) -> ListIterator {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `head` and `tail` are never read
[INFO] [stdout]   --> src/linked_list/DoublyLinkedList.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub struct BetterTransactionLog {
[INFO] [stdout]    |            -------------------- fields in this struct
[INFO] [stdout] 66 |     head: Link,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 67 |     tail: Link,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BetterTransactionLog` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `LinkedList` should have a snake case name
[INFO] [stdout]  --> src/linked_list/mod.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub mod LinkedList;
[INFO] [stdout]   |         ^^^^^^^^^^ help: convert the identifier to snake case: `linked_list`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `DoublyLinkedList` should have a snake case name
[INFO] [stdout]  --> src/linked_list/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub mod DoublyLinkedList;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `doubly_linked_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] running `Command { std: "docker" "inspect" "88f57540847fd013e579e34a7e8ab241dffe3c9a5b0bf035a31008abe0e9fbc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88f57540847fd013e579e34a7e8ab241dffe3c9a5b0bf035a31008abe0e9fbc5", kill_on_drop: false }`
[INFO] [stdout] 88f57540847fd013e579e34a7e8ab241dffe3c9a5b0bf035a31008abe0e9fbc5