[INFO] updating cached repository https://github.com/DownsizeEngineering/tRust_problems
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] [stderr] From https://github.com/DownsizeEngineering/tRust_problems
[INFO] [stderr]    4045f44..f7bb21f  master     -> master
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f7bb21f575cfa751ea4c9c310c3bf88003644167
[INFO] checking DownsizeEngineering/tRust_problems against master#e22b61bff0bdd08be7665607cb7be3748c8a35d2 for pr-74627
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDownsizeEngineering%2FtRust_problems" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DownsizeEngineering/tRust_problems on toolchain e22b61bff0bdd08be7665607cb7be3748c8a35d2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/DownsizeEngineering/tRust_problems
[INFO] finished tweaking git repo https://github.com/DownsizeEngineering/tRust_problems
[INFO] tweaked toml for git repo https://github.com/DownsizeEngineering/tRust_problems written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/DownsizeEngineering/tRust_problems already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7ea942393f949112dfd52ff70278b9bb85b879a5b6aaf101d12dd400358c9e6
[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" "a7ea942393f949112dfd52ff70278b9bb85b879a5b6aaf101d12dd400358c9e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7ea942393f949112dfd52ff70278b9bb85b879a5b6aaf101d12dd400358c9e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7ea942393f949112dfd52ff70278b9bb85b879a5b6aaf101d12dd400358c9e6", kill_on_drop: false }`
[INFO] [stdout] a7ea942393f949112dfd52ff70278b9bb85b879a5b6aaf101d12dd400358c9e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c0ddd04b10e0d59efe558c60d3654f91e7b69f521f09a2ed18f27a8d7790d431
[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" "c0ddd04b10e0d59efe558c60d3654f91e7b69f521f09a2ed18f27a8d7790d431", kill_on_drop: false }`
[INFO] [stderr]     Checking t_rust_problems v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/CharTrie.rs:30:24
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn step(&self, c: char) -> Option<Box<CharTrieNode>> {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `node`
[INFO] [stdout]   --> src/CharTrie.rs:69:21
[INFO] [stdout]    |
[INFO] [stdout] 69 |         if let Some(node) = self.children.get(&c) {
[INFO] [stdout]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `words`
[INFO] [stdout]   --> src/CharTrie.rs:75:16
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub fn new(words: Vec<String>) -> CharTrie {
[INFO] [stdout]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/CharTrie.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut output = CharTrie {
[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: struct is never constructed: `CharTrie`
[INFO] [stdout]  --> src/CharTrie.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct CharTrie {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `CharTrieNode`
[INFO] [stdout]  --> src/CharTrie.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct CharTrieNode {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/CharTrie.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn new(val: char) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `end`
[INFO] [stdout]   --> src/CharTrie.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn end(&mut self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_end`
[INFO] [stdout]   --> src/CharTrie.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn is_end(&self) -> bool { return self.end; }
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `step`
[INFO] [stdout]   --> src/CharTrie.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn step(&self, c: char) -> Option<Box<CharTrieNode>> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/CharTrie.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn insert(&mut self, string: &str) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `contains`
[INFO] [stdout]   --> src/CharTrie.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn contains(&self, string: &str) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `end`
[INFO] [stdout]   --> src/CharTrie.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 |     fn end(&mut self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `step`
[INFO] [stdout]   --> src/CharTrie.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 68 |     pub fn step(&self, c: char) -> Option<Box<CharTrieNode>> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/CharTrie.rs:75:12
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub fn new(words: Vec<String>) -> CharTrie {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `CharTrie` should have a snake case name
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | mod CharTrie;
[INFO] [stdout]    |     ^^^^^^^^ help: convert the identifier to snake case: `char_trie`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/CharTrie.rs:30:24
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn step(&self, c: char) -> Option<Box<CharTrieNode>> {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `node`
[INFO] [stdout]   --> src/CharTrie.rs:69:21
[INFO] [stdout]    |
[INFO] [stdout] 69 |         if let Some(node) = self.children.get(&c) {
[INFO] [stdout]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `words`
[INFO] [stdout]   --> src/CharTrie.rs:75:16
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub fn new(words: Vec<String>) -> CharTrie {
[INFO] [stdout]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/CharTrie.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut output = CharTrie {
[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: struct is never constructed: `CharTrie`
[INFO] [stdout]  --> src/CharTrie.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct CharTrie {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `CharTrieNode`
[INFO] [stdout]  --> src/CharTrie.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct CharTrieNode {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/CharTrie.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn new(val: char) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `end`
[INFO] [stdout]   --> src/CharTrie.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn end(&mut self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_end`
[INFO] [stdout]   --> src/CharTrie.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn is_end(&self) -> bool { return self.end; }
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `step`
[INFO] [stdout]   --> src/CharTrie.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn step(&self, c: char) -> Option<Box<CharTrieNode>> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/CharTrie.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn insert(&mut self, string: &str) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `contains`
[INFO] [stdout]   --> src/CharTrie.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn contains(&self, string: &str) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `end`
[INFO] [stdout]   --> src/CharTrie.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 |     fn end(&mut self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `step`
[INFO] [stdout]   --> src/CharTrie.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 68 |     pub fn step(&self, c: char) -> Option<Box<CharTrieNode>> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/CharTrie.rs:75:12
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub fn new(words: Vec<String>) -> CharTrie {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `CharTrie` should have a snake case name
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | mod CharTrie;
[INFO] [stdout]    |     ^^^^^^^^ help: convert the identifier to snake case: `char_trie`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `Command { std: "docker" "inspect" "c0ddd04b10e0d59efe558c60d3654f91e7b69f521f09a2ed18f27a8d7790d431", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0ddd04b10e0d59efe558c60d3654f91e7b69f521f09a2ed18f27a8d7790d431", kill_on_drop: false }`
[INFO] [stdout] c0ddd04b10e0d59efe558c60d3654f91e7b69f521f09a2ed18f27a8d7790d431