[INFO] cloning repository https://github.com/shafiquejamal/rust-coding-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shafiquejamal/rust-coding-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshafiquejamal%2Frust-coding-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshafiquejamal%2Frust-coding-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5576137b21ec1db8f3824bdfe6c4faf360c6aaaa
[INFO] checking shafiquejamal/rust-coding-practice against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshafiquejamal%2Frust-coding-practice" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shafiquejamal/rust-coding-practice on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shafiquejamal/rust-coding-practice
[INFO] finished tweaking git repo https://github.com/shafiquejamal/rust-coding-practice
[INFO] tweaked toml for git repo https://github.com/shafiquejamal/rust-coding-practice written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/shafiquejamal/rust-coding-practice 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce23dd81f76824c42c69462379812e5040690926010f8eea95ee4e2314ed37d3
[INFO] running `Command { std: "docker" "start" "-a" "ce23dd81f76824c42c69462379812e5040690926010f8eea95ee4e2314ed37d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce23dd81f76824c42c69462379812e5040690926010f8eea95ee4e2314ed37d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce23dd81f76824c42c69462379812e5040690926010f8eea95ee4e2314ed37d3", kill_on_drop: false }`
[INFO] [stdout] ce23dd81f76824c42c69462379812e5040690926010f8eea95ee4e2314ed37d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6d90910dc07eec26919f2c4bb7ee779f71f2770a7082a985c418485ad408674b
[INFO] running `Command { std: "docker" "start" "-a" "6d90910dc07eec26919f2c4bb7ee779f71f2770a7082a985c418485ad408674b", kill_on_drop: false }`
[INFO] [stderr]     Checking playground1 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `set`
[INFO] [stdout]  --> src/p_refs1.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut set: HashSet<&str> = HashSet::new();
[INFO] [stdout]   |             ^^^ help: if this is intentional, prefix it with an underscore: `_set`
[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/p_refs1.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut set: HashSet<&str> = HashSet::new();
[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: unused variable: `t`
[INFO] [stdout]  --> src/p_refs1.rs:9:39
[INFO] [stdout]   |
[INFO] [stdout] 9 |             Some(next_targets) => for t in *next_targets {},
[INFO] [stdout]   |                                       ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/sg_anagrams.rs:15:17
[INFO] [stdout]    |
[INFO] [stdout] 15 |             let mut count: &mut u32 = a_map.get_mut(&c).unwrap_or(&mut default);
[INFO] [stdout]    |                 ----^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/sg_reversestring.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     for i in 0..=last_index {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recurse` is never used
[INFO] [stdout]  --> src/p_refs1.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn recurse<'b>(m: &HashMap<&str, Vec<&'b str>>, new_target: &'b str) {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fib_memo` is never used
[INFO] [stdout]   --> src/sg_fibonacci.rs:83:8
[INFO] [stdout]    |
[INFO] [stdout] 83 |     fn fib_memo(n: usize, memo: &mut [Option<usize>]) -> usize {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/sg_linked_list.rs:99:16
[INFO] [stdout]    |
[INFO] [stdout] 99 |             if index < 0 {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `set`
[INFO] [stdout]  --> src/p_refs1.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut set: HashSet<&str> = HashSet::new();
[INFO] [stdout]   |             ^^^ help: if this is intentional, prefix it with an underscore: `_set`
[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/p_refs1.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut set: HashSet<&str> = HashSet::new();
[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: unused variable: `t`
[INFO] [stdout]  --> src/p_refs1.rs:9:39
[INFO] [stdout]   |
[INFO] [stdout] 9 |             Some(next_targets) => for t in *next_targets {},
[INFO] [stdout]   |                                       ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/sg_anagrams.rs:15:17
[INFO] [stdout]    |
[INFO] [stdout] 15 |             let mut count: &mut u32 = a_map.get_mut(&c).unwrap_or(&mut default);
[INFO] [stdout]    |                 ----^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/sg_reversestring.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     for i in 0..=last_index {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recurse` is never used
[INFO] [stdout]  --> src/p_refs1.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn recurse<'b>(m: &HashMap<&str, Vec<&'b str>>, new_target: &'b str) {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_rec_depth1` is never used
[INFO] [stdout]   --> src/p_refs1.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn no_rec_depth1() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_rec_depth2` is never used
[INFO] [stdout]   --> src/p_refs1.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 |     fn no_rec_depth2() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fib_memo` is never used
[INFO] [stdout]   --> src/sg_fibonacci.rs:83:8
[INFO] [stdout]    |
[INFO] [stdout] 83 |     fn fib_memo(n: usize, memo: &mut [Option<usize>]) -> usize {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `can_weave` is never used
[INFO] [stdout]   --> src/sg_queue.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn can_weave() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/sg_linked_list.rs:99:16
[INFO] [stdout]    |
[INFO] [stdout] 99 |             if index < 0 {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "6d90910dc07eec26919f2c4bb7ee779f71f2770a7082a985c418485ad408674b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d90910dc07eec26919f2c4bb7ee779f71f2770a7082a985c418485ad408674b", kill_on_drop: false }`
[INFO] [stdout] 6d90910dc07eec26919f2c4bb7ee779f71f2770a7082a985c418485ad408674b