[INFO] cloning repository https://github.com/yutaro-sakamoto/learn-rust2
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yutaro-sakamoto/learn-rust2" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyutaro-sakamoto%2Flearn-rust2", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyutaro-sakamoto%2Flearn-rust2'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 24aa2ab7020179d23294e3197ebef89623952521
[INFO] checking yutaro-sakamoto/learn-rust2 against try#e622d8d7bed4f2668d446e06c6c1436ecae15796 for pr-156776
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyutaro-sakamoto%2Flearn-rust2" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/yutaro-sakamoto/learn-rust2
[INFO] finished tweaking git repo https://github.com/yutaro-sakamoto/learn-rust2
[INFO] tweaked toml for git repo https://github.com/yutaro-sakamoto/learn-rust2 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/yutaro-sakamoto/learn-rust2 on toolchain e622d8d7bed4f2668d446e06c6c1436ecae15796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/yutaro-sakamoto/learn-rust2 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" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ac4126169948f5b0f79a9a63f793596968d5bed54b1ac03caa052ed102f7f4c9
[INFO] running `Command { std: "docker" "start" "-a" "ac4126169948f5b0f79a9a63f793596968d5bed54b1ac03caa052ed102f7f4c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac4126169948f5b0f79a9a63f793596968d5bed54b1ac03caa052ed102f7f4c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac4126169948f5b0f79a9a63f793596968d5bed54b1ac03caa052ed102f7f4c9", kill_on_drop: false }`
[INFO] [stdout] ac4126169948f5b0f79a9a63f793596968d5bed54b1ac03caa052ed102f7f4c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f3bd44212e705ef6101346802c13b6a3bfe7225e0a357304f397cb4574c6027d
[INFO] running `Command { std: "docker" "start" "-a" "f3bd44212e705ef6101346802c13b6a3bfe7225e0a357304f397cb4574c6027d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling libc v0.2.183
[INFO] [stderr]    Compiling getrandom v0.4.2
[INFO] [stderr]     Checking rand_core v0.10.0
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking cpufeatures v0.3.0
[INFO] [stderr]     Checking memchr v2.8.0
[INFO] [stderr]     Checking chacha20 v0.10.0
[INFO] [stderr]     Checking serde_json v1.0.149
[INFO] [stderr]     Checking rmp v0.8.15
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking rand v0.10.0
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]     Checking rmp-serde v1.3.1
[INFO] [stderr]     Checking serde_yaml v0.9.34+deprecated
[INFO] [stderr]     Checking learn-rust2 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `mem::take`
[INFO] [stdout]  --> src/engine/parser.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     mem::take,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Env_f` should have an upper camel case name
[INFO] [stdout]    --> src/main.rs:303:12
[INFO] [stdout]     |
[INFO] [stdout] 303 |     struct Env_f<'a> {
[INFO] [stdout]     |            ^^^^^ help: convert the identifier to upper camel case: `EnvF`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `closure_f` should have an upper camel case name
[INFO] [stdout]    --> src/main.rs:307:12
[INFO] [stdout]     |
[INFO] [stdout] 307 |     struct closure_f<'a> {
[INFO] [stdout]     |            ^^^^^^^^^ help: convert the identifier to upper camel case: `ClosureF`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let mut n: u64 = 100;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mem::take`
[INFO] [stdout]  --> src/engine/parser.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     mem::take,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Env_f` should have an upper camel case name
[INFO] [stdout]    --> src/main.rs:303:12
[INFO] [stdout]     |
[INFO] [stdout] 303 |     struct Env_f<'a> {
[INFO] [stdout]     |            ^^^^^ help: convert the identifier to upper camel case: `EnvF`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `closure_f` should have an upper camel case name
[INFO] [stdout]    --> src/main.rs:307:12
[INFO] [stdout]     |
[INFO] [stdout] 307 |     struct closure_f<'a> {
[INFO] [stdout]     |            ^^^^^^^^^ help: convert the identifier to upper camel case: `ClosureF`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |     let mut f = || match &mut s {
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hdd`
[INFO] [stdout]   --> src/main.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |     let hdd = Storage::HDD {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hdd`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ssd`
[INFO] [stdout]   --> src/main.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 |     let ssd = Storage::SSD(512);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_ssd`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n3`
[INFO] [stdout]    --> src/main.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |     let n3 = List::Node {
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_n3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `buf`
[INFO] [stdout]    --> src/main.rs:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     let buf = Buffer::<128> { buf: [0; 128] };
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_buf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]    --> src/main.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |     let m: i64 = n as i64;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |     let s = String::from("abc");
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:149:9
[INFO] [stdout]     |
[INFO] [stdout] 149 |     let s: String = "abc".into();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]    --> src/main.rs:173:13
[INFO] [stdout]     |
[INFO] [stdout] 173 |         let r = m + n;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> src/main.rs:182:9
[INFO] [stdout]     |
[INFO] [stdout] 182 |     let result = result.unwrap();
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:198:9
[INFO] [stdout]     |
[INFO] [stdout] 198 |     let b = if n > 0 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/main.rs:292:9
[INFO] [stdout]     |
[INFO] [stdout] 292 |     let v = vec![true, false, false];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:295:9
[INFO] [stdout]     |
[INFO] [stdout] 295 |     let n = f(10, 20);
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/main.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |     let mut f = || match &mut s {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `spec`
[INFO] [stdout]    --> src/main.rs:352:9
[INFO] [stdout]     |
[INFO] [stdout] 352 |     let spec = PCSpec::new(8, 32, s);
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_spec`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `total`
[INFO] [stdout]    --> src/main.rs:406:9
[INFO] [stdout]     |
[INFO] [stdout] 406 |     let total = it.clone().fold(0, |acc, x| acc + x);
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_total`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/main.rs:408:9
[INFO] [stdout]     |
[INFO] [stdout] 408 |     let list: LinkedList<_> = it.filter(|n| *n % 2 == 0).collect();
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `h2o_1`
[INFO] [stdout]    --> src/main.rs:529:10
[INFO] [stdout]     |
[INFO] [stdout] 529 |     let (h2o_1, h2o_2) = burn(h2_1, h2_2, o2);
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_h2o_1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `h2o_2`
[INFO] [stdout]    --> src/main.rs:529:17
[INFO] [stdout]     |
[INFO] [stdout] 529 |     let (h2o_1, h2o_2) = burn(h2_1, h2_2, o2);
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_h2o_2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:535:9
[INFO] [stdout]     |
[INFO] [stdout] 535 |     let c = b;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:539:9
[INFO] [stdout]     |
[INFO] [stdout] 539 |     let c = a + b;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:540:9
[INFO] [stdout]     |
[INFO] [stdout] 540 |     let d = a * b;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:578:13
[INFO] [stdout]     |
[INFO] [stdout] 578 |         let c = &a;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:579:13
[INFO] [stdout]     |
[INFO] [stdout] 579 |         let d = b;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]    --> src/main.rs:610:9
[INFO] [stdout]     |
[INFO] [stdout] 610 |     let w = v.clone();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]    --> src/main.rs:611:9
[INFO] [stdout]     |
[INFO] [stdout] 611 |     let z = v.clone();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:167:13
[INFO] [stdout]     |
[INFO] [stdout] 167 |         let n: u32 = a + b;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]    --> src/main.rs:168:13
[INFO] [stdout]     |
[INFO] [stdout] 168 |         let m = a + b;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:904:13
[INFO] [stdout]     |
[INFO] [stdout] 904 |         let b = b::TypeB;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> src/main.rs:907:13
[INFO] [stdout]     |
[INFO] [stdout] 907 |         let b2 = b::b_2::TypeB2;
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]    --> src/main.rs:952:21
[INFO] [stdout]     |
[INFO] [stdout] 952 |                 let p1 = c_1_inner::TypeC1;
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]    --> src/main.rs:953:21
[INFO] [stdout]     |
[INFO] [stdout] 953 |                 let p2 = c_1_inner::TypeC2;
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]    --> src/main.rs:959:17
[INFO] [stdout]     |
[INFO] [stdout] 959 |             let p1 = c_1_outer::c_1_inner::TypeC1;
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `DoW` is never used
[INFO] [stdout]   --> src/main.rs:75:10
[INFO] [stdout]    |
[INFO] [stdout] 75 |     enum DoW {
[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 `rpm` is never read
[INFO] [stdout]   --> src/main.rs:86:26
[INFO] [stdout]    |
[INFO] [stdout] 86 |         HDD { size: u32, rpm: u32 },
[INFO] [stdout]    |         ---              ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |         SSD(u32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 87 -         SSD(u32),
[INFO] [stdout] 87 +         SSD(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `memory` and `storage` are never read
[INFO] [stdout]   --> src/main.rs:97:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     struct PCSpec {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 96 |         cpus: u16,
[INFO] [stdout] 97 |         memory: u32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 98 |         storage: Storage,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]    --> src/main.rs:109:22
[INFO] [stdout]     |
[INFO] [stdout] 109 |     struct Dim2(u32, u32);
[INFO] [stdout]     |            ----      ^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `data` and `next` are never read
[INFO] [stdout]    --> src/main.rs:118:16
[INFO] [stdout]     |
[INFO] [stdout] 118 |         Node { data: T, next: Box<List<T>> },
[INFO] [stdout]     |         ----   ^^^^     ^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `buf` is never read
[INFO] [stdout]    --> src/main.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 139 |     struct Buffer<const S: usize> {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 140 |         buf: [u8; S],
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `func` is never used
[INFO] [stdout]    --> src/main.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn func(a: u32, b: u32) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sumup` is never used
[INFO] [stdout]    --> src/main.rs:184:8
[INFO] [stdout]     |
[INFO] [stdout] 184 |     fn sumup(n: u64) -> u64 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sumup_loop` is never used
[INFO] [stdout]    --> src/main.rs:206:8
[INFO] [stdout]     |
[INFO] [stdout] 206 |     fn sumup_loop(mut n: u64) -> u64 {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sumup_while` is never used
[INFO] [stdout]    --> src/main.rs:218:8
[INFO] [stdout]     |
[INFO] [stdout] 218 |     fn sumup_while(mut n: u64) -> u64 {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sumup_for` is never used
[INFO] [stdout]    --> src/main.rs:227:8
[INFO] [stdout]     |
[INFO] [stdout] 227 |     fn sumup_for(n: u64) -> u64 {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `average` is never used
[INFO] [stdout]    --> src/main.rs:264:8
[INFO] [stdout]     |
[INFO] [stdout] 264 |     fn average(v: &[f32]) -> Option<f32> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Env_f` is never constructed
[INFO] [stdout]    --> src/main.rs:303:12
[INFO] [stdout]     |
[INFO] [stdout] 303 |     struct Env_f<'a> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `closure_f` is never constructed
[INFO] [stdout]    --> src/main.rs:307:12
[INFO] [stdout]     |
[INFO] [stdout] 307 |     struct closure_f<'a> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_size` is never used
[INFO] [stdout]    --> src/main.rs:319:8
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn get_size(s: &Storage) -> u32 {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_size` and `set_size` are never used
[INFO] [stdout]    --> src/main.rs:327:12
[INFO] [stdout]     |
[INFO] [stdout] 326 |     impl Storage {
[INFO] [stdout]     |     ------------ methods in this implementation
[INFO] [stdout] 327 |         fn get_size(&self) -> u32 {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 334 |         fn set_size(&mut self, size: u32) {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `XOR64` is never constructed
[INFO] [stdout]    --> src/main.rs:441:12
[INFO] [stdout]     |
[INFO] [stdout] 441 |     struct XOR64 {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `next` are never used
[INFO] [stdout]    --> src/main.rs:446:12
[INFO] [stdout]     |
[INFO] [stdout] 445 |     impl XOR64 {
[INFO] [stdout]     |     ---------- associated items in this implementation
[INFO] [stdout] 446 |         fn new(seed: u64) -> XOR64 {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 452 |         fn next(&mut self) -> u64 {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `NUM` is never used
[INFO] [stdout]    --> src/main.rs:462:11
[INFO] [stdout]     |
[INFO] [stdout] 462 |     const NUM: usize = 200000000;
[INFO] [stdout]     |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `randomized_vec` is never used
[INFO] [stdout]    --> src/main.rs:464:8
[INFO] [stdout]     |
[INFO] [stdout] 464 |     fn randomized_vec() -> (Vec<u64>, Vec<u64>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `single_threaded` is never used
[INFO] [stdout]    --> src/main.rs:479:8
[INFO] [stdout]     |
[INFO] [stdout] 479 |     fn single_threaded() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multi_threaded` is never used
[INFO] [stdout]    --> src/main.rs:494:8
[INFO] [stdout]     |
[INFO] [stdout] 494 |     fn multi_threaded() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `x` is never read
[INFO] [stdout]    --> src/main.rs:559:9
[INFO] [stdout]     |
[INFO] [stdout] 558 |     struct Foo<'a> {
[INFO] [stdout]     |            --- field in this struct
[INFO] [stdout] 559 |         x: &'a i32,
[INFO] [stdout]     |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `iter` is never used
[INFO] [stdout]    --> src/main.rs:666:12
[INFO] [stdout]     |
[INFO] [stdout] 654 |     impl<T> MyList<T> {
[INFO] [stdout]     |     ----------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 666 |         fn iter<'a>(&'a self) -> ListIter<'a, T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListIter` is never constructed
[INFO] [stdout]    --> src/main.rs:671:12
[INFO] [stdout]     |
[INFO] [stdout] 671 |     struct ListIter<'a, T> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square2` is never used
[INFO] [stdout]    --> src/main.rs:724:8
[INFO] [stdout]     |
[INFO] [stdout] 724 |     fn square2<T>(x: T) -> T
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ErrorA` is never constructed
[INFO] [stdout]    --> src/main.rs:778:12
[INFO] [stdout]     |
[INFO] [stdout] 778 |     struct ErrorA;
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ErrorB` is never constructed
[INFO] [stdout]    --> src/main.rs:789:12
[INFO] [stdout]     |
[INFO] [stdout] 789 |     struct ErrorB;
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_a` is never used
[INFO] [stdout]    --> src/main.rs:798:8
[INFO] [stdout]     |
[INFO] [stdout] 798 |     fn error_a() -> Result<(), ErrorA> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_b` is never used
[INFO] [stdout]    --> src/main.rs:802:8
[INFO] [stdout]     |
[INFO] [stdout] 802 |     fn error_b() -> Result<(), ErrorB> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_ab` is never used
[INFO] [stdout]    --> src/main.rs:806:8
[INFO] [stdout]     |
[INFO] [stdout] 806 |     fn error_ab() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `scope` is never used
[INFO] [stdout]    --> src/main.rs:903:8
[INFO] [stdout]     |
[INFO] [stdout] 903 |     fn scope() {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_rw_lock_example` is never used
[INFO] [stdout]    --> src/main.rs:973:4
[INFO] [stdout]     |
[INFO] [stdout] 973 | fn run_rw_lock_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA` is never constructed
[INFO] [stdout]  --> src/a.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct TypeA;
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA1` is never constructed
[INFO] [stdout]  --> src/a/a_1.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct TypeA1;
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA2` is never constructed
[INFO] [stdout]  --> src/a/a_2.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct TypeA2;
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `AST` is never used
[INFO] [stdout]  --> src/engine/parser.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub enum AST {
[INFO] [stdout]   |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ParseError` is never used
[INFO] [stdout]   --> src/engine/parser.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub enum ParseError {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_escape` is never used
[INFO] [stdout]   --> src/engine/parser.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn parse_escape(pos: usize, c: char) -> Result<AST, ParseError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `PSQ` is never used
[INFO] [stdout]   --> src/engine/parser.rs:58:6
[INFO] [stdout]    |
[INFO] [stdout] 58 | enum PSQ {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_plus_star_question` is never used
[INFO] [stdout]   --> src/engine/parser.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 64 | fn parse_plus_star_question(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fold_or` is never used
[INFO] [stdout]   --> src/engine/parser.rs:82:4
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn fold_or(mut seq_or: Vec<AST>) -> Option<AST> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA` is never constructed
[INFO] [stdout]    --> src/main.rs:875:16
[INFO] [stdout]     |
[INFO] [stdout] 875 |         struct TypeA {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA1` is never constructed
[INFO] [stdout]    --> src/main.rs:880:20
[INFO] [stdout]     |
[INFO] [stdout] 880 |             struct TypeA1 {
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA2` is never constructed
[INFO] [stdout]    --> src/main.rs:886:24
[INFO] [stdout]     |
[INFO] [stdout] 886 |             pub struct TypeA2 {
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB` is never constructed
[INFO] [stdout]    --> src/main.rs:894:20
[INFO] [stdout]     |
[INFO] [stdout] 894 |         pub struct TypeB;
[INFO] [stdout]     |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB1` is never constructed
[INFO] [stdout]    --> src/main.rs:896:24
[INFO] [stdout]     |
[INFO] [stdout] 896 |             pub struct TypeB1;
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB2` is never constructed
[INFO] [stdout]    --> src/main.rs:899:24
[INFO] [stdout]     |
[INFO] [stdout] 899 |             pub struct TypeB2;
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB` is never constructed
[INFO] [stdout]    --> src/main.rs:911:20
[INFO] [stdout]     |
[INFO] [stdout] 911 |         pub struct TypeB;
[INFO] [stdout]     |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB1` is never constructed
[INFO] [stdout]    --> src/main.rs:913:24
[INFO] [stdout]     |
[INFO] [stdout] 913 |             pub struct TypeB1 {
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `g` and `h` are never used
[INFO] [stdout]    --> src/main.rs:919:20
[INFO] [stdout]     |
[INFO] [stdout] 918 |             impl TypeB1 {
[INFO] [stdout]     |             ----------- methods in this implementation
[INFO] [stdout] 919 |                 fn g(&self) {}
[INFO] [stdout]     |                    ^
[INFO] [stdout] 920 |                 pub fn h(&self) {}
[INFO] [stdout]     |                        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f1` is never used
[INFO] [stdout]    --> src/main.rs:923:16
[INFO] [stdout]     |
[INFO] [stdout] 923 |             fn f1(p: &super::b_1::TypeB1) {
[INFO] [stdout]     |                ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB2` is never constructed
[INFO] [stdout]    --> src/main.rs:931:24
[INFO] [stdout]     |
[INFO] [stdout] 931 |             pub struct TypeB2;
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f2` is never used
[INFO] [stdout]    --> src/main.rs:933:16
[INFO] [stdout]     |
[INFO] [stdout] 933 |             fn f2(p: &super::b_1::TypeB1) {
[INFO] [stdout]     |                ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `g` is never used
[INFO] [stdout]    --> src/main.rs:958:12
[INFO] [stdout]     |
[INFO] [stdout] 958 |         fn g() {
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f` is never used
[INFO] [stdout]    --> src/main.rs:951:16
[INFO] [stdout]     |
[INFO] [stdout] 951 |             fn f() {
[INFO] [stdout]     |                ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeC1` is never constructed
[INFO] [stdout]    --> src/main.rs:945:35
[INFO] [stdout]     |
[INFO] [stdout] 945 |                 pub(crate) struct TypeC1;
[INFO] [stdout]     |                                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeC2` is never constructed
[INFO] [stdout]    --> src/main.rs:946:35
[INFO] [stdout]     |
[INFO] [stdout] 946 |                 pub(super) struct TypeC2;
[INFO] [stdout]     |                                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeC4` is never constructed
[INFO] [stdout]    --> src/main.rs:948:34
[INFO] [stdout]     |
[INFO] [stdout] 948 |                 pub(self) struct TypeC4;
[INFO] [stdout]     |                                  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeD` is never constructed
[INFO] [stdout]    --> src/main.rs:964:20
[INFO] [stdout]     |
[INFO] [stdout] 964 |         pub struct TypeD;
[INFO] [stdout]     |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1020:5
[INFO] [stdout]      |
[INFO] [stdout] 1020 |     staff.join();
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1020 |     let _ = staff.join();
[INFO] [stdout]      |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let mut n: u64 = 100;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |     let mut f = || match &mut s {
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hdd`
[INFO] [stdout]   --> src/main.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |     let hdd = Storage::HDD {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hdd`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ssd`
[INFO] [stdout]   --> src/main.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 |     let ssd = Storage::SSD(512);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_ssd`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n3`
[INFO] [stdout]    --> src/main.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |     let n3 = List::Node {
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_n3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `buf`
[INFO] [stdout]    --> src/main.rs:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     let buf = Buffer::<128> { buf: [0; 128] };
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_buf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]    --> src/main.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |     let m: i64 = n as i64;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |     let s = String::from("abc");
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:149:9
[INFO] [stdout]     |
[INFO] [stdout] 149 |     let s: String = "abc".into();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]    --> src/main.rs:173:13
[INFO] [stdout]     |
[INFO] [stdout] 173 |         let r = m + n;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> src/main.rs:182:9
[INFO] [stdout]     |
[INFO] [stdout] 182 |     let result = result.unwrap();
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:198:9
[INFO] [stdout]     |
[INFO] [stdout] 198 |     let b = if n > 0 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/main.rs:292:9
[INFO] [stdout]     |
[INFO] [stdout] 292 |     let v = vec![true, false, false];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:295:9
[INFO] [stdout]     |
[INFO] [stdout] 295 |     let n = f(10, 20);
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/main.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |     let mut f = || match &mut s {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `spec`
[INFO] [stdout]    --> src/main.rs:352:9
[INFO] [stdout]     |
[INFO] [stdout] 352 |     let spec = PCSpec::new(8, 32, s);
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_spec`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `total`
[INFO] [stdout]    --> src/main.rs:406:9
[INFO] [stdout]     |
[INFO] [stdout] 406 |     let total = it.clone().fold(0, |acc, x| acc + x);
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_total`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/main.rs:408:9
[INFO] [stdout]     |
[INFO] [stdout] 408 |     let list: LinkedList<_> = it.filter(|n| *n % 2 == 0).collect();
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `h2o_1`
[INFO] [stdout]    --> src/main.rs:529:10
[INFO] [stdout]     |
[INFO] [stdout] 529 |     let (h2o_1, h2o_2) = burn(h2_1, h2_2, o2);
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_h2o_1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `h2o_2`
[INFO] [stdout]    --> src/main.rs:529:17
[INFO] [stdout]     |
[INFO] [stdout] 529 |     let (h2o_1, h2o_2) = burn(h2_1, h2_2, o2);
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_h2o_2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:535:9
[INFO] [stdout]     |
[INFO] [stdout] 535 |     let c = b;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:539:9
[INFO] [stdout]     |
[INFO] [stdout] 539 |     let c = a + b;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:540:9
[INFO] [stdout]     |
[INFO] [stdout] 540 |     let d = a * b;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:578:13
[INFO] [stdout]     |
[INFO] [stdout] 578 |         let c = &a;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:579:13
[INFO] [stdout]     |
[INFO] [stdout] 579 |         let d = b;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]    --> src/main.rs:610:9
[INFO] [stdout]     |
[INFO] [stdout] 610 |     let w = v.clone();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]    --> src/main.rs:611:9
[INFO] [stdout]     |
[INFO] [stdout] 611 |     let z = v.clone();
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:167:13
[INFO] [stdout]     |
[INFO] [stdout] 167 |         let n: u32 = a + b;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]    --> src/main.rs:168:13
[INFO] [stdout]     |
[INFO] [stdout] 168 |         let m = a + b;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:904:13
[INFO] [stdout]     |
[INFO] [stdout] 904 |         let b = b::TypeB;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> src/main.rs:907:13
[INFO] [stdout]     |
[INFO] [stdout] 907 |         let b2 = b::b_2::TypeB2;
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]    --> src/main.rs:952:21
[INFO] [stdout]     |
[INFO] [stdout] 952 |                 let p1 = c_1_inner::TypeC1;
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]    --> src/main.rs:953:21
[INFO] [stdout]     |
[INFO] [stdout] 953 |                 let p2 = c_1_inner::TypeC2;
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]    --> src/main.rs:959:17
[INFO] [stdout]     |
[INFO] [stdout] 959 |             let p1 = c_1_outer::c_1_inner::TypeC1;
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `DoW` is never used
[INFO] [stdout]   --> src/main.rs:75:10
[INFO] [stdout]    |
[INFO] [stdout] 75 |     enum DoW {
[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 `rpm` is never read
[INFO] [stdout]   --> src/main.rs:86:26
[INFO] [stdout]    |
[INFO] [stdout] 86 |         HDD { size: u32, rpm: u32 },
[INFO] [stdout]    |         ---              ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |         SSD(u32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 87 -         SSD(u32),
[INFO] [stdout] 87 +         SSD(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `memory` and `storage` are never read
[INFO] [stdout]   --> src/main.rs:97:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     struct PCSpec {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 96 |         cpus: u16,
[INFO] [stdout] 97 |         memory: u32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 98 |         storage: Storage,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]    --> src/main.rs:109:22
[INFO] [stdout]     |
[INFO] [stdout] 109 |     struct Dim2(u32, u32);
[INFO] [stdout]     |            ----      ^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `data` and `next` are never read
[INFO] [stdout]    --> src/main.rs:118:16
[INFO] [stdout]     |
[INFO] [stdout] 118 |         Node { data: T, next: Box<List<T>> },
[INFO] [stdout]     |         ----   ^^^^     ^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `buf` is never read
[INFO] [stdout]    --> src/main.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 139 |     struct Buffer<const S: usize> {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 140 |         buf: [u8; S],
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `func` is never used
[INFO] [stdout]    --> src/main.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn func(a: u32, b: u32) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sumup` is never used
[INFO] [stdout]    --> src/main.rs:184:8
[INFO] [stdout]     |
[INFO] [stdout] 184 |     fn sumup(n: u64) -> u64 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sumup_loop` is never used
[INFO] [stdout]    --> src/main.rs:206:8
[INFO] [stdout]     |
[INFO] [stdout] 206 |     fn sumup_loop(mut n: u64) -> u64 {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sumup_while` is never used
[INFO] [stdout]    --> src/main.rs:218:8
[INFO] [stdout]     |
[INFO] [stdout] 218 |     fn sumup_while(mut n: u64) -> u64 {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sumup_for` is never used
[INFO] [stdout]    --> src/main.rs:227:8
[INFO] [stdout]     |
[INFO] [stdout] 227 |     fn sumup_for(n: u64) -> u64 {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `average` is never used
[INFO] [stdout]    --> src/main.rs:264:8
[INFO] [stdout]     |
[INFO] [stdout] 264 |     fn average(v: &[f32]) -> Option<f32> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Env_f` is never constructed
[INFO] [stdout]    --> src/main.rs:303:12
[INFO] [stdout]     |
[INFO] [stdout] 303 |     struct Env_f<'a> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `closure_f` is never constructed
[INFO] [stdout]    --> src/main.rs:307:12
[INFO] [stdout]     |
[INFO] [stdout] 307 |     struct closure_f<'a> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_size` is never used
[INFO] [stdout]    --> src/main.rs:319:8
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn get_size(s: &Storage) -> u32 {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_size` and `set_size` are never used
[INFO] [stdout]    --> src/main.rs:327:12
[INFO] [stdout]     |
[INFO] [stdout] 326 |     impl Storage {
[INFO] [stdout]     |     ------------ methods in this implementation
[INFO] [stdout] 327 |         fn get_size(&self) -> u32 {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 334 |         fn set_size(&mut self, size: u32) {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `XOR64` is never constructed
[INFO] [stdout]    --> src/main.rs:441:12
[INFO] [stdout]     |
[INFO] [stdout] 441 |     struct XOR64 {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `next` are never used
[INFO] [stdout]    --> src/main.rs:446:12
[INFO] [stdout]     |
[INFO] [stdout] 445 |     impl XOR64 {
[INFO] [stdout]     |     ---------- associated items in this implementation
[INFO] [stdout] 446 |         fn new(seed: u64) -> XOR64 {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 452 |         fn next(&mut self) -> u64 {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `NUM` is never used
[INFO] [stdout]    --> src/main.rs:462:11
[INFO] [stdout]     |
[INFO] [stdout] 462 |     const NUM: usize = 200000000;
[INFO] [stdout]     |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `randomized_vec` is never used
[INFO] [stdout]    --> src/main.rs:464:8
[INFO] [stdout]     |
[INFO] [stdout] 464 |     fn randomized_vec() -> (Vec<u64>, Vec<u64>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `single_threaded` is never used
[INFO] [stdout]    --> src/main.rs:479:8
[INFO] [stdout]     |
[INFO] [stdout] 479 |     fn single_threaded() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multi_threaded` is never used
[INFO] [stdout]    --> src/main.rs:494:8
[INFO] [stdout]     |
[INFO] [stdout] 494 |     fn multi_threaded() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `x` is never read
[INFO] [stdout]    --> src/main.rs:559:9
[INFO] [stdout]     |
[INFO] [stdout] 558 |     struct Foo<'a> {
[INFO] [stdout]     |            --- field in this struct
[INFO] [stdout] 559 |         x: &'a i32,
[INFO] [stdout]     |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `iter` is never used
[INFO] [stdout]    --> src/main.rs:666:12
[INFO] [stdout]     |
[INFO] [stdout] 654 |     impl<T> MyList<T> {
[INFO] [stdout]     |     ----------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 666 |         fn iter<'a>(&'a self) -> ListIter<'a, T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListIter` is never constructed
[INFO] [stdout]    --> src/main.rs:671:12
[INFO] [stdout]     |
[INFO] [stdout] 671 |     struct ListIter<'a, T> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square2` is never used
[INFO] [stdout]    --> src/main.rs:724:8
[INFO] [stdout]     |
[INFO] [stdout] 724 |     fn square2<T>(x: T) -> T
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ErrorA` is never constructed
[INFO] [stdout]    --> src/main.rs:778:12
[INFO] [stdout]     |
[INFO] [stdout] 778 |     struct ErrorA;
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ErrorB` is never constructed
[INFO] [stdout]    --> src/main.rs:789:12
[INFO] [stdout]     |
[INFO] [stdout] 789 |     struct ErrorB;
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_a` is never used
[INFO] [stdout]    --> src/main.rs:798:8
[INFO] [stdout]     |
[INFO] [stdout] 798 |     fn error_a() -> Result<(), ErrorA> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_b` is never used
[INFO] [stdout]    --> src/main.rs:802:8
[INFO] [stdout]     |
[INFO] [stdout] 802 |     fn error_b() -> Result<(), ErrorB> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_ab` is never used
[INFO] [stdout]    --> src/main.rs:806:8
[INFO] [stdout]     |
[INFO] [stdout] 806 |     fn error_ab() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `scope` is never used
[INFO] [stdout]    --> src/main.rs:903:8
[INFO] [stdout]     |
[INFO] [stdout] 903 |     fn scope() {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_rw_lock_example` is never used
[INFO] [stdout]    --> src/main.rs:973:4
[INFO] [stdout]     |
[INFO] [stdout] 973 | fn run_rw_lock_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA` is never constructed
[INFO] [stdout]  --> src/a.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct TypeA;
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA1` is never constructed
[INFO] [stdout]  --> src/a/a_1.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct TypeA1;
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA2` is never constructed
[INFO] [stdout]  --> src/a/a_2.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct TypeA2;
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `AST` is never used
[INFO] [stdout]  --> src/engine/parser.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub enum AST {
[INFO] [stdout]   |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ParseError` is never used
[INFO] [stdout]   --> src/engine/parser.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub enum ParseError {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_escape` is never used
[INFO] [stdout]   --> src/engine/parser.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn parse_escape(pos: usize, c: char) -> Result<AST, ParseError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `PSQ` is never used
[INFO] [stdout]   --> src/engine/parser.rs:58:6
[INFO] [stdout]    |
[INFO] [stdout] 58 | enum PSQ {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_plus_star_question` is never used
[INFO] [stdout]   --> src/engine/parser.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 64 | fn parse_plus_star_question(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fold_or` is never used
[INFO] [stdout]   --> src/engine/parser.rs:82:4
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn fold_or(mut seq_or: Vec<AST>) -> Option<AST> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA` is never constructed
[INFO] [stdout]    --> src/main.rs:875:16
[INFO] [stdout]     |
[INFO] [stdout] 875 |         struct TypeA {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA1` is never constructed
[INFO] [stdout]    --> src/main.rs:880:20
[INFO] [stdout]     |
[INFO] [stdout] 880 |             struct TypeA1 {
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeA2` is never constructed
[INFO] [stdout]    --> src/main.rs:886:24
[INFO] [stdout]     |
[INFO] [stdout] 886 |             pub struct TypeA2 {
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB` is never constructed
[INFO] [stdout]    --> src/main.rs:894:20
[INFO] [stdout]     |
[INFO] [stdout] 894 |         pub struct TypeB;
[INFO] [stdout]     |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB1` is never constructed
[INFO] [stdout]    --> src/main.rs:896:24
[INFO] [stdout]     |
[INFO] [stdout] 896 |             pub struct TypeB1;
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB2` is never constructed
[INFO] [stdout]    --> src/main.rs:899:24
[INFO] [stdout]     |
[INFO] [stdout] 899 |             pub struct TypeB2;
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB` is never constructed
[INFO] [stdout]    --> src/main.rs:911:20
[INFO] [stdout]     |
[INFO] [stdout] 911 |         pub struct TypeB;
[INFO] [stdout]     |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB1` is never constructed
[INFO] [stdout]    --> src/main.rs:913:24
[INFO] [stdout]     |
[INFO] [stdout] 913 |             pub struct TypeB1 {
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `g` and `h` are never used
[INFO] [stdout]    --> src/main.rs:919:20
[INFO] [stdout]     |
[INFO] [stdout] 918 |             impl TypeB1 {
[INFO] [stdout]     |             ----------- methods in this implementation
[INFO] [stdout] 919 |                 fn g(&self) {}
[INFO] [stdout]     |                    ^
[INFO] [stdout] 920 |                 pub fn h(&self) {}
[INFO] [stdout]     |                        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f1` is never used
[INFO] [stdout]    --> src/main.rs:923:16
[INFO] [stdout]     |
[INFO] [stdout] 923 |             fn f1(p: &super::b_1::TypeB1) {
[INFO] [stdout]     |                ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeB2` is never constructed
[INFO] [stdout]    --> src/main.rs:931:24
[INFO] [stdout]     |
[INFO] [stdout] 931 |             pub struct TypeB2;
[INFO] [stdout]     |                        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f2` is never used
[INFO] [stdout]    --> src/main.rs:933:16
[INFO] [stdout]     |
[INFO] [stdout] 933 |             fn f2(p: &super::b_1::TypeB1) {
[INFO] [stdout]     |                ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `g` is never used
[INFO] [stdout]    --> src/main.rs:958:12
[INFO] [stdout]     |
[INFO] [stdout] 958 |         fn g() {
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f` is never used
[INFO] [stdout]    --> src/main.rs:951:16
[INFO] [stdout]     |
[INFO] [stdout] 951 |             fn f() {
[INFO] [stdout]     |                ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeC1` is never constructed
[INFO] [stdout]    --> src/main.rs:945:35
[INFO] [stdout]     |
[INFO] [stdout] 945 |                 pub(crate) struct TypeC1;
[INFO] [stdout]     |                                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeC2` is never constructed
[INFO] [stdout]    --> src/main.rs:946:35
[INFO] [stdout]     |
[INFO] [stdout] 946 |                 pub(super) struct TypeC2;
[INFO] [stdout]     |                                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeC4` is never constructed
[INFO] [stdout]    --> src/main.rs:948:34
[INFO] [stdout]     |
[INFO] [stdout] 948 |                 pub(self) struct TypeC4;
[INFO] [stdout]     |                                  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TypeD` is never constructed
[INFO] [stdout]    --> src/main.rs:964:20
[INFO] [stdout]     |
[INFO] [stdout] 964 |         pub struct TypeD;
[INFO] [stdout]     |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1020:5
[INFO] [stdout]      |
[INFO] [stdout] 1020 |     staff.join();
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1020 |     let _ = staff.join();
[INFO] [stdout]      |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.14s
[INFO] running `Command { std: "docker" "inspect" "f3bd44212e705ef6101346802c13b6a3bfe7225e0a357304f397cb4574c6027d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3bd44212e705ef6101346802c13b6a3bfe7225e0a357304f397cb4574c6027d", kill_on_drop: false }`
[INFO] [stdout] f3bd44212e705ef6101346802c13b6a3bfe7225e0a357304f397cb4574c6027d
