[INFO] cloning repository https://github.com/TonyBlock/rust_labs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TonyBlock/rust_labs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTonyBlock%2Frust_labs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTonyBlock%2Frust_labs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3216a2708f44a292b3ab0a02a1eb7deb992fa6ec
[INFO] checking TonyBlock/rust_labs against master#9e293ae9f8abecb0be5105787d181518c9012a19 for pr-146440-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTonyBlock%2Frust_labs" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/TonyBlock/rust_labs
[INFO] finished tweaking git repo https://github.com/TonyBlock/rust_labs
[INFO] tweaked toml for git repo https://github.com/TonyBlock/rust_labs written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/TonyBlock/rust_labs on toolchain 9e293ae9f8abecb0be5105787d181518c9012a19
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9e293ae9f8abecb0be5105787d181518c9012a19" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/TonyBlock/rust_labs 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" "+9e293ae9f8abecb0be5105787d181518c9012a19" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+9e293ae9f8abecb0be5105787d181518c9012a19" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5e4d2e40e2e110f786f92ac29638821629d97045652acc0b5c7d1ab217532c3f
[INFO] running `Command { std: "docker" "start" "-a" "5e4d2e40e2e110f786f92ac29638821629d97045652acc0b5c7d1ab217532c3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5e4d2e40e2e110f786f92ac29638821629d97045652acc0b5c7d1ab217532c3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e4d2e40e2e110f786f92ac29638821629d97045652acc0b5c7d1ab217532c3f", kill_on_drop: false }`
[INFO] [stdout] 5e4d2e40e2e110f786f92ac29638821629d97045652acc0b5c7d1ab217532c3f
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+9e293ae9f8abecb0be5105787d181518c9012a19" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74c52b916a5f61889545d7c03fc4b7fb857474ac1d0e7b8a45898e06d449118a
[INFO] running `Command { std: "docker" "start" "-a" "74c52b916a5f61889545d7c03fc4b7fb857474ac1d0e7b8a45898e06d449118a", kill_on_drop: false }`
[INFO] [stderr]     Checking POTS_Labs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking lab_14 v0.1.0 (/opt/rustwide/workdir/lab_14)
[INFO] [stderr]     Checking lab_1 v0.1.0 (/opt/rustwide/workdir/lab_1)
[INFO] [stderr]     Checking lab_6 v0.1.0 (/opt/rustwide/workdir/lab_6)
[INFO] [stderr]     Checking lab_5 v0.1.0 (/opt/rustwide/workdir/lab_5)
[INFO] [stderr]     Checking lab_4 v0.1.0 (/opt/rustwide/workdir/lab_4)
[INFO] [stderr]     Checking lab_2 v0.1.0 (/opt/rustwide/workdir/lab_2)
[INFO] [stderr]     Checking lab_16 v0.1.0 (/opt/rustwide/workdir/lab_16)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> lab_14/src/main.rs:27:25
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport {
[INFO] [stdout]    |                         ^^^^^^^^^ the lifetime is elided here     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport<'_> {
[INFO] [stdout]    |                                                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking lab_17 v0.1.0 (/opt/rustwide/workdir/lab_17)
[INFO] [stdout] warning: enum `Operation` is never used
[INFO] [stdout]  --> lab_6/src/main.rs:3:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum Operation {
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expression` is never used
[INFO] [stdout]   --> lab_6/src/main.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | enum Expression {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval` is never used
[INFO] [stdout]   --> lab_6/src/main.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn eval(e: Expression) -> i64 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking lab_11 v0.1.0 (/opt/rustwide/workdir/lab_11)
[INFO] [stderr]     Checking lab_18 v0.1.0 (/opt/rustwide/workdir/lab_18)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> lab_5/src/main.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |     CarArrived(Floor),
[INFO] [stdout]   |     ---------- ^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Event` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 4 -     CarArrived(Floor),
[INFO] [stdout] 4 +     CarArrived(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `offset_differences` is never used
[INFO] [stdout]  --> lab_16/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn offset_differences(offset: usize, values: Vec<i32>) -> Vec<i32> {
[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 `0` is never read
[INFO] [stdout]  --> lab_5/src/main.rs:5:25
[INFO] [stdout]   |
[INFO] [stdout] 5 |     CarDoorStateUpdated(CarDoorState),
[INFO] [stdout]   |     ------------------- ^^^^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Event` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 5 -     CarDoorStateUpdated(CarDoorState),
[INFO] [stdout] 5 +     CarDoorStateUpdated(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> lab_5/src/main.rs:6:19
[INFO] [stdout]   |
[INFO] [stdout] 6 |     ButtonPressed(Button),
[INFO] [stdout]   |     ------------- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Event` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 6 -     ButtonPressed(Button),
[INFO] [stdout] 6 +     ButtonPressed(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> lab_5/src/main.rs:20:15
[INFO] [stdout]    |
[INFO] [stdout] 20 |     LobbyCall(Floor, Direction),
[INFO] [stdout]    |     --------- ^^^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Button` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 20 -     LobbyCall(Floor, Direction),
[INFO] [stdout] 20 +     LobbyCall((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> lab_5/src/main.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 21 |     CarFloor(Floor)
[INFO] [stdout]    |     -------- ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Button` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 21 -     CarFloor(Floor)
[INFO] [stdout] 21 +     CarFloor(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Down` is never constructed
[INFO] [stdout]   --> lab_5/src/main.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | enum Direction {
[INFO] [stdout]    |      --------- variant in this enum
[INFO] [stdout] 27 |     Up,
[INFO] [stdout] 28 |     Down,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Direction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking lab_3 v0.1.0 (/opt/rustwide/workdir/lab_3)
[INFO] [stderr]     Checking lab_12 v0.1.0 (/opt/rustwide/workdir/lab_12)
[INFO] [stderr]     Checking lab_9 v0.1.0 (/opt/rustwide/workdir/lab_9)
[INFO] [stderr]     Checking lab_10 v0.1.0 (/opt/rustwide/workdir/lab_10)
[INFO] [stderr]     Checking lab_13 v0.1.0 (/opt/rustwide/workdir/lab_13)
[INFO] [stdout] warning: variants `Java` and `Perl` are never constructed
[INFO] [stdout]  --> lab_12/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Language {
[INFO] [stdout]   |      -------- variants in this enum
[INFO] [stdout] 3 |     Rust,
[INFO] [stdout] 4 |     Java,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 5 |     Perl,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Language` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `version_expression` are never read
[INFO] [stdout]   --> lab_12/src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | struct Dependency {
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 10 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 11 |     version_expression: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Dependency` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking lab_7 v0.1.0 (/opt/rustwide/workdir/lab_7)
[INFO] [stderr]     Checking lab_8 v0.1.0 (/opt/rustwide/workdir/lab_8)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> lab_5/src/main.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |     CarArrived(Floor),
[INFO] [stdout]   |     ---------- ^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Event` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 4 -     CarArrived(Floor),
[INFO] [stdout] 4 +     CarArrived(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> lab_5/src/main.rs:5:25
[INFO] [stdout]   |
[INFO] [stdout] 5 |     CarDoorStateUpdated(CarDoorState),
[INFO] [stdout]   |     ------------------- ^^^^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Event` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 5 -     CarDoorStateUpdated(CarDoorState),
[INFO] [stdout] 5 +     CarDoorStateUpdated(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> lab_5/src/main.rs:6:19
[INFO] [stdout]   |
[INFO] [stdout] 6 |     ButtonPressed(Button),
[INFO] [stdout]   |     ------------- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Event` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 6 -     ButtonPressed(Button),
[INFO] [stdout] 6 +     ButtonPressed(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> lab_5/src/main.rs:20:15
[INFO] [stdout]    |
[INFO] [stdout] 20 |     LobbyCall(Floor, Direction),
[INFO] [stdout]    |     --------- ^^^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Button` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 20 -     LobbyCall(Floor, Direction),
[INFO] [stdout] 20 +     LobbyCall((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> lab_5/src/main.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 21 |     CarFloor(Floor)
[INFO] [stdout]    |     -------- ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Button` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 21 -     CarFloor(Floor)
[INFO] [stdout] 21 +     CarFloor(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Down` is never constructed
[INFO] [stdout]   --> lab_5/src/main.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | enum Direction {
[INFO] [stdout]    |      --------- variant in this enum
[INFO] [stdout] 27 |     Up,
[INFO] [stdout] 28 |     Down,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Direction` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking lab_15 v0.1.0 (/opt/rustwide/workdir/lab_15)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> lab_14/src/main.rs:27:25
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport {
[INFO] [stdout]    |                         ^^^^^^^^^ the lifetime is elided here     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport<'_> {
[INFO] [stdout]    |                                                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value`, `left`, and `right` are never read
[INFO] [stdout]  --> lab_13/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node<T: Ord> {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 6 |     value: T,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     left: Subtree<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 8 |     right: Subtree<T>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> lab_13/src/main.rs:13:24
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Subtree<T: Ord>(Option<Box<Node<T>>>);
[INFO] [stdout]    |        -------         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `Subtree` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `root` is never read
[INFO] [stdout]   --> lab_13/src/main.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct BinaryTree<T: Ord> {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 20 |     root: Subtree<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BinaryTree` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `insert`, `has`, and `len` are never used
[INFO] [stdout]   --> lab_13/src/main.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl<T: Ord> BinaryTree<T> {
[INFO] [stdout]    | -------------------------- associated items in this implementation
[INFO] [stdout] 24 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn insert(&mut self, value: T) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     fn has(&self, value: &T) -> bool {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     fn len(&self) -> usize {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `insert`, `has`, and `len` are never used
[INFO] [stdout]   --> lab_13/src/main.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | impl<T: Ord> Subtree<T> {
[INFO] [stdout]    | ----------------------- associated items in this implementation
[INFO] [stdout] 42 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     fn insert(&mut self, value: T) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 59 |     fn has(&self, value: &T) -> bool {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn len(&self) -> usize {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> lab_15/src/main.rs:100:22
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn parse_field(data: &[u8]) -> (Field, &[u8]) {
[INFO] [stdout]     |                      ^^^^^      ^^^^^  ^^^^^ the same lifetime is elided here
[INFO] [stdout]     |                      |          |
[INFO] [stdout]     |                      |          the same lifetime is hidden here
[INFO] [stdout]     |                      the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn parse_field(data: &[u8]) -> (Field<'_>, &[u8]) {
[INFO] [stdout]     |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Java` and `Perl` are never constructed
[INFO] [stdout]  --> lab_12/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Language {
[INFO] [stdout]   |      -------- variants in this enum
[INFO] [stdout] 3 |     Rust,
[INFO] [stdout] 4 |     Java,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 5 |     Perl,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Language` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `version_expression` are never read
[INFO] [stdout]   --> lab_12/src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | struct Dependency {
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 10 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 11 |     version_expression: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Dependency` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> lab_15/src/main.rs:100:22
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn parse_field(data: &[u8]) -> (Field, &[u8]) {
[INFO] [stdout]     |                      ^^^^^      ^^^^^  ^^^^^ the same lifetime is elided here
[INFO] [stdout]     |                      |          |
[INFO] [stdout]     |                      |          the same lifetime is hidden here
[INFO] [stdout]     |                      the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn parse_field(data: &[u8]) -> (Field<'_>, &[u8]) {
[INFO] [stdout]     |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Div` is never constructed
[INFO] [stdout]  --> lab_6/src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum Operation {
[INFO] [stdout]   |      --------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 7 |     Div,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Operation` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.61s
[INFO] running `Command { std: "docker" "inspect" "74c52b916a5f61889545d7c03fc4b7fb857474ac1d0e7b8a45898e06d449118a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74c52b916a5f61889545d7c03fc4b7fb857474ac1d0e7b8a45898e06d449118a", kill_on_drop: false }`
[INFO] [stdout] 74c52b916a5f61889545d7c03fc4b7fb857474ac1d0e7b8a45898e06d449118a
