[INFO] cloning repository https://github.com/zhanlanlan/hello_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zhanlanlan/hello_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhanlanlan%2Fhello_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhanlanlan%2Fhello_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4c249263b1b91bfb05ff22d3f7787b93b0a8bb97
[INFO] checking zhanlanlan/hello_rust against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhanlanlan%2Fhello_rust" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zhanlanlan/hello_rust on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zhanlanlan/hello_rust
[INFO] finished tweaking git repo https://github.com/zhanlanlan/hello_rust
[INFO] tweaked toml for git repo https://github.com/zhanlanlan/hello_rust written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/zhanlanlan/hello_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bd1803df490d1199abb22c4a15a0c75a051e50eb5001787d5ef37ef6e8790d05
[INFO] running `Command { std: "docker" "start" "-a" "bd1803df490d1199abb22c4a15a0c75a051e50eb5001787d5ef37ef6e8790d05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd1803df490d1199abb22c4a15a0c75a051e50eb5001787d5ef37ef6e8790d05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd1803df490d1199abb22c4a15a0c75a051e50eb5001787d5ef37ef6e8790d05", kill_on_drop: false }`
[INFO] [stdout] bd1803df490d1199abb22c4a15a0c75a051e50eb5001787d5ef37ef6e8790d05
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 93cec53c39aae388602ee55f8ff81e71886e6737c29a7497e417fcdba9fa9cc4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "93cec53c39aae388602ee55f8ff81e71886e6737c29a7497e417fcdba9fa9cc4", kill_on_drop: false }`
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[INFO] [stderr]     Checking hello_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rand::RngCore`
[INFO] [stdout]  --> src/lib/search_tree.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use rand::RngCore;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Eq`, `Ord`
[INFO] [stdout]  --> src/lib/search_tree.rs:8:16
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::cmp::{Eq, Ord, PartialEq, PartialOrd};
[INFO] [stdout]   |                ^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/lib/search_tree.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `chrono::prelude::*`
[INFO] [stdout]  --> src/lib/syncer.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use chrono::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]  --> src/lib/syncer.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::fmt::Display;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::RngCore`
[INFO] [stdout]  --> src/lib/search_tree.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use rand::RngCore;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Eq`, `Ord`
[INFO] [stdout]  --> src/lib/search_tree.rs:8:16
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::cmp::{Eq, Ord, PartialEq, PartialOrd};
[INFO] [stdout]   |                ^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/lib/search_tree.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/lib/sorts.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `chrono::prelude::*`
[INFO] [stdout]  --> src/lib/syncer.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use chrono::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]  --> src/lib/syncer.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::fmt::Display;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/lib/search_tree.rs:85:25
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn delete(mut self, word: T) -> bool {
[INFO] [stdout]    |                         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib/search_tree.rs:85:15
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn delete(mut self, word: T) -> bool {
[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]   --> src/lib/sorts.rs:27:15
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn quick_sort(mut nums: Vec<i64>) -> Vec<i64> {
[INFO] [stdout]    |               ----^^^^
[INFO] [stdout]    |               |
[INFO] [stdout]    |               help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/lib/search_tree.rs:85:25
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn delete(mut self, word: T) -> bool {
[INFO] [stdout]    |                         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Tree`
[INFO] [stdout]  --> src/lib/binary_tree_rust.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Tree<'a> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `item_check`
[INFO] [stdout]   --> src/lib/binary_tree_rust.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn item_check(tree: &Tree) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bottom_up_tree`
[INFO] [stdout]   --> src/lib/binary_tree_rust.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn bottom_up_tree<'r>(arena: &'r Arena<Tree<'r>>, depth: i32) -> &'r Tree<'r> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `inner`
[INFO] [stdout]   --> src/lib/binary_tree_rust.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn inner(depth: i32, iterations: i32) -> String {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/lib/binary_tree_rust.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/lib/sorts.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/lib/syncer.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `match_enent`
[INFO] [stdout]   --> src/lib/syncer.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn match_enent(event: DebouncedEvent) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib/search_tree.rs:85:15
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn delete(mut self, word: T) -> bool {
[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]   --> src/lib/sorts.rs:27:15
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn quick_sort(mut nums: Vec<i64>) -> Vec<i64> {
[INFO] [stdout]    |               ----^^^^
[INFO] [stdout]    |               |
[INFO] [stdout]    |               help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Tree`
[INFO] [stdout]  --> src/lib/binary_tree_rust.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Tree<'a> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `item_check`
[INFO] [stdout]   --> src/lib/binary_tree_rust.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn item_check(tree: &Tree) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bottom_up_tree`
[INFO] [stdout]   --> src/lib/binary_tree_rust.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn bottom_up_tree<'r>(arena: &'r Arena<Tree<'r>>, depth: i32) -> &'r Tree<'r> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `inner`
[INFO] [stdout]   --> src/lib/binary_tree_rust.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn inner(depth: i32, iterations: i32) -> String {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/lib/binary_tree_rust.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/lib/sorts.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bubble_sort`
[INFO] [stdout]  --> src/lib/sorts.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn bubble_sort(mut nums: Vec<i64>) -> Vec<i64> {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `insert_sort`
[INFO] [stdout]   --> src/lib/sorts.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn insert_sort(mut nums: Vec<i64>) -> Vec<i64> {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `quick_sort`
[INFO] [stdout]   --> src/lib/sorts.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn quick_sort(mut nums: Vec<i64>) -> Vec<i64> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/lib/syncer.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `match_enent`
[INFO] [stdout]   --> src/lib/syncer.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn match_enent(event: DebouncedEvent) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3m 14s
[INFO] running `Command { std: "docker" "inspect" "93cec53c39aae388602ee55f8ff81e71886e6737c29a7497e417fcdba9fa9cc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93cec53c39aae388602ee55f8ff81e71886e6737c29a7497e417fcdba9fa9cc4", kill_on_drop: false }`
[INFO] [stdout] 93cec53c39aae388602ee55f8ff81e71886e6737c29a7497e417fcdba9fa9cc4