[INFO] fetching crate rust-cheatsheet 0.1.0...
[INFO] checking rust-cheatsheet-0.1.0 against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] extracting crate rust-cheatsheet 0.1.0 into /workspace/builds/worker-39/source
[INFO] validating manifest of crates.io crate rust-cheatsheet 0.1.0 on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rust-cheatsheet 0.1.0
[INFO] finished tweaking crates.io crate rust-cheatsheet 0.1.0
[INFO] tweaked toml for crates.io crate rust-cheatsheet 0.1.0 written to /workspace/builds/worker-39/source/Cargo.toml
[INFO] crate crates.io crate rust-cheatsheet 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "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-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 340b42ceb21ecbb7616a04b762360e9aac92e25b6b288561ec01c3511ff8826a
[INFO] running `Command { std: "docker" "start" "-a" "340b42ceb21ecbb7616a04b762360e9aac92e25b6b288561ec01c3511ff8826a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "340b42ceb21ecbb7616a04b762360e9aac92e25b6b288561ec01c3511ff8826a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "340b42ceb21ecbb7616a04b762360e9aac92e25b6b288561ec01c3511ff8826a", kill_on_drop: false }`
[INFO] [stdout] 340b42ceb21ecbb7616a04b762360e9aac92e25b6b288561ec01c3511ff8826a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9f3121ea580440ff294e19a392c4757038a6386cd30b213853f22cb7a273aeb2
[INFO] running `Command { std: "docker" "start" "-a" "9f3121ea580440ff294e19a392c4757038a6386cd30b213853f22cb7a273aeb2", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rust-cheatsheet v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/lib.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/lib.rs (2 fixes)
[INFO] [stderr]    Migrating src/references.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/ownership.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/iterators.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/closures.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating tests/integration_test.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/data-types.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/control-flow.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/structs/structs3.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/lifetimes.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/testing.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/errors.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/collections/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/functions.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/structs/structs1.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/collections/hashmaps.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/variables.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/collections/strings.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/structs/structs2.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/enums/enums2.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/references.rs (6 fixes)
[INFO] [stderr]    Migrating src/bin/collections/vectors.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/generics/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/enums/enums1.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/slices.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/ownership.rs (8 fixes)
[INFO] [stderr]        Fixed src/bin/iterators.rs (1 fix)
[INFO] [stdout] warning: function is never used: `shoes_in_size`
[INFO] [stdout]   --> src/bin/iterators.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn shoes_in_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/data-types.rs (28 fixes)
[INFO] [stderr]        Fixed src/bin/errors.rs (5 fixes)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/errors.rs:65:2
[INFO] [stdout]    |
[INFO] [stdout] 65 |     read_username_from_file_oneline("hello.txt");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/structs/structs1.rs (3 fixes)
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/structs/structs1.rs:52:2
[INFO] [stdout]    |
[INFO] [stdout] 52 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/structs/structs1.rs:54:2
[INFO] [stdout]    |
[INFO] [stdout] 54 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/structs/structs1.rs:55:2
[INFO] [stdout]    |
[INFO] [stdout] 55 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/bin/collections/vectors.rs (4 fixes)
[INFO] [stderr]        Fixed src/bin/collections/hashmaps.rs (1 fix)
[INFO] [stderr]        Fixed src/bin/collections/strings.rs (21 fixes)
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]  --> src/bin/testing.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn add_two(a: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `median` is never read
[INFO] [stdout]    --> src/bin/collections/vectors.rs:103:10
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let mut median: f64 = -1.0;
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/functions.rs (1 fix)
[INFO] [stdout] warning: value assigned to `median` is never read
[INFO] [stdout]    --> src/bin/collections/vectors.rs:103:10
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let mut median: f64 = -1.0;
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/main.rs (1 fix)
[INFO] [stderr]        Fixed src/variables.rs (3 fixes)
[INFO] [stderr]        Fixed src/structs/structs2.rs (1 fix)
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/structs/structs2.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     width: u32,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/structs/structs2.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     height: u32,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/errors.rs:65:2
[INFO] [stdout]    |
[INFO] [stdout] 65 |     read_username_from_file_oneline("hello.txt");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/enums/enums2.rs (3 fixes)
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]   --> src/enums/enums2.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let mut count = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/enums/enums2.rs:59:3
[INFO] [stdout]    |
[INFO] [stdout] 59 |         count += 1;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]  --> src/enums/enums2.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Penny,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]  --> src/enums/enums2.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Nickel,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `median` is never read
[INFO] [stdout]    --> src/bin/collections/vectors.rs:103:10
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let mut median: f64 = -1.0;
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `median` is never read
[INFO] [stdout]    --> src/bin/collections/vectors.rs:103:10
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let mut median: f64 = -1.0;
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/bin/generics/main.rs (7 fixes)
[INFO] [stderr]        Fixed src/slices.rs (8 fixes)
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]  --> src/bin/generics/main.rs:7:2
[INFO] [stdout]   |
[INFO] [stdout] 7 |     y: T,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/bin/generics/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     x: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/bin/generics/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     y: U,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/bin/generics/main.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Option<T> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/bin/generics/main.rs:20:6
[INFO] [stdout]    |
[INFO] [stdout] 20 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `distance_from_origin`
[INFO] [stdout]   --> src/bin/generics/main.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/bin/generics/main.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn mixup<V, W>(self, other: Point2<V, W>) -> Point2<T, W> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify_mult_impl`
[INFO] [stdout]   --> src/bin/generics/main.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn notify_mult_impl<T: Summary + Minimize>(item: &T) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]   --> src/bin/generics/main.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn some_function<T: Display + Debug, U: Clone + Debug>(_t: &T, _u: &U) -> i32 {5}
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function_where_`
[INFO] [stdout]   --> src/bin/generics/main.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn some_function_where_<T, U>(_t: &T, _u: &U) -> i32 
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_clone`
[INFO] [stdout]    --> src/bin/generics/main.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn largest_clone<T: PartialOrd + Clone>(list: &[T]) -> T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_using_return_ref`
[INFO] [stdout]    --> src/bin/generics/main.rs:118:4
[INFO] [stdout]     |
[INFO] [stdout] 118 | fn largest_using_return_ref<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]    --> src/bin/generics/main.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 130 | struct Pair<T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/bin/generics/main.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 136 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]    --> src/bin/generics/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 142 |     fn cmp_display(&self) { // fn is only implement when generic type of T conform to PartialOrd and Display trait
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait method `summarizeDef` should have a snake case name
[INFO] [stdout]   --> src/bin/generics/traits.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn summarizeDef(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `summarize_def`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/structs/structs1.rs:52:2
[INFO] [stdout]    |
[INFO] [stdout] 52 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/structs/structs1.rs:54:2
[INFO] [stdout]    |
[INFO] [stdout] 54 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/structs/structs1.rs:55:2
[INFO] [stdout]    |
[INFO] [stdout] 55 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]   --> src/enums/enums2.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let mut count = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/enums/enums2.rs:59:3
[INFO] [stdout]    |
[INFO] [stdout] 59 |         count += 1;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]  --> src/enums/enums2.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Penny,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]  --> src/enums/enums2.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Nickel,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]  --> src/bin/generics/main.rs:7:2
[INFO] [stdout]   |
[INFO] [stdout] 7 |     y: T,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/bin/generics/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     x: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/bin/generics/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     y: U,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/bin/generics/main.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Option<T> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/bin/generics/main.rs:20:6
[INFO] [stdout]    |
[INFO] [stdout] 20 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `distance_from_origin`
[INFO] [stdout]   --> src/bin/generics/main.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/bin/generics/main.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn mixup<V, W>(self, other: Point2<V, W>) -> Point2<T, W> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify_mult_impl`
[INFO] [stdout]   --> src/bin/generics/main.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn notify_mult_impl<T: Summary + Minimize>(item: &T) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]   --> src/bin/generics/main.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn some_function<T: Display + Debug, U: Clone + Debug>(_t: &T, _u: &U) -> i32 {5}
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function_where_`
[INFO] [stdout]   --> src/bin/generics/main.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn some_function_where_<T, U>(_t: &T, _u: &U) -> i32 
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_clone`
[INFO] [stdout]    --> src/bin/generics/main.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn largest_clone<T: PartialOrd + Clone>(list: &[T]) -> T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_using_return_ref`
[INFO] [stdout]    --> src/bin/generics/main.rs:118:4
[INFO] [stdout]     |
[INFO] [stdout] 118 | fn largest_using_return_ref<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]    --> src/bin/generics/main.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 130 | struct Pair<T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/bin/generics/main.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 136 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]    --> src/bin/generics/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 142 |     fn cmp_display(&self) { // fn is only implement when generic type of T conform to PartialOrd and Display trait
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait method `summarizeDef` should have a snake case name
[INFO] [stdout]   --> src/bin/generics/traits.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn summarizeDef(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `summarize_def`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/structs/structs2.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     width: u32,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/structs/structs2.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     height: u32,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.21s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Checking rust-cheatsheet v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/errors.rs:65:2
[INFO] [stdout]    |
[INFO] [stdout] 65 |     read_username_from_file_oneline("hello.txt");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]  --> src/bin/generics/main.rs:7:2
[INFO] [stdout]   |
[INFO] [stdout] 7 |     y: T,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/bin/generics/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     x: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/bin/generics/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     y: U,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/bin/generics/main.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Option<T> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/bin/generics/main.rs:20:6
[INFO] [stdout]    |
[INFO] [stdout] 20 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `distance_from_origin`
[INFO] [stdout]   --> src/bin/generics/main.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/bin/generics/main.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn mixup<V, W>(self, other: Point2<V, W>) -> Point2<T, W> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify_mult_impl`
[INFO] [stdout]   --> src/bin/generics/main.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn notify_mult_impl<T: Summary + Minimize>(item: &T) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]   --> src/bin/generics/main.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn some_function<T: Display + Debug, U: Clone + Debug>(_t: &T, _u: &U) -> i32 {5}
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function_where_`
[INFO] [stdout]   --> src/bin/generics/main.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn some_function_where_<T, U>(_t: &T, _u: &U) -> i32 
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_clone`
[INFO] [stdout]    --> src/bin/generics/main.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn largest_clone<T: PartialOrd + Clone>(list: &[T]) -> T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_using_return_ref`
[INFO] [stdout]    --> src/bin/generics/main.rs:118:4
[INFO] [stdout]     |
[INFO] [stdout] 118 | fn largest_using_return_ref<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]    --> src/bin/generics/main.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 130 | struct Pair<T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/bin/generics/main.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 136 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]    --> src/bin/generics/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 142 |     fn cmp_display(&self) { // fn is only implement when generic type of T conform to PartialOrd and Display trait
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait method `summarizeDef` should have a snake case name
[INFO] [stdout]   --> src/bin/generics/traits.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn summarizeDef(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `summarize_def`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]   --> src/enums/enums2.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let mut count = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/enums/enums2.rs:59:3
[INFO] [stdout]    |
[INFO] [stdout] 59 |         count += 1;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]  --> src/enums/enums2.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Penny,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/structs/structs2.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     width: u32,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]  --> src/bin/testing.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn add_two(a: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/structs/structs2.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     height: u32,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]  --> src/enums/enums2.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Nickel,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `median` is never read
[INFO] [stdout]    --> src/bin/collections/vectors.rs:103:10
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let mut median: f64 = -1.0;
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]   --> src/enums/enums2.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let mut count = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/enums/enums2.rs:59:3
[INFO] [stdout]    |
[INFO] [stdout] 59 |         count += 1;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shoes_in_size`
[INFO] [stdout]   --> src/bin/iterators.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn shoes_in_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/structs/structs2.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     width: u32,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/structs/structs2.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     height: u32,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]  --> src/enums/enums2.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Penny,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]  --> src/enums/enums2.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Nickel,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `median` is never read
[INFO] [stdout]    --> src/bin/collections/vectors.rs:103:10
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let mut median: f64 = -1.0;
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `median` is never read
[INFO] [stdout]    --> src/bin/collections/vectors.rs:103:10
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let mut median: f64 = -1.0;
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/errors.rs:65:2
[INFO] [stdout]    |
[INFO] [stdout] 65 |     read_username_from_file_oneline("hello.txt");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/structs/structs1.rs:52:2
[INFO] [stdout]    |
[INFO] [stdout] 52 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/structs/structs1.rs:54:2
[INFO] [stdout]    |
[INFO] [stdout] 54 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/structs/structs1.rs:55:2
[INFO] [stdout]    |
[INFO] [stdout] 55 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/structs/structs1.rs:52:2
[INFO] [stdout]    |
[INFO] [stdout] 52 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/structs/structs1.rs:54:2
[INFO] [stdout]    |
[INFO] [stdout] 54 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/structs/structs1.rs:55:2
[INFO] [stdout]    |
[INFO] [stdout] 55 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `median` is never read
[INFO] [stdout]    --> src/bin/collections/vectors.rs:103:10
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let mut median: f64 = -1.0;
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]  --> src/bin/generics/main.rs:7:2
[INFO] [stdout]   |
[INFO] [stdout] 7 |     y: T,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/bin/generics/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     x: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/bin/generics/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     y: U,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/bin/generics/main.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Option<T> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/bin/generics/main.rs:20:6
[INFO] [stdout]    |
[INFO] [stdout] 20 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `distance_from_origin`
[INFO] [stdout]   --> src/bin/generics/main.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/bin/generics/main.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn mixup<V, W>(self, other: Point2<V, W>) -> Point2<T, W> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify_mult_impl`
[INFO] [stdout]   --> src/bin/generics/main.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn notify_mult_impl<T: Summary + Minimize>(item: &T) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]   --> src/bin/generics/main.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn some_function<T: Display + Debug, U: Clone + Debug>(_t: &T, _u: &U) -> i32 {5}
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function_where_`
[INFO] [stdout]   --> src/bin/generics/main.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn some_function_where_<T, U>(_t: &T, _u: &U) -> i32 
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_clone`
[INFO] [stdout]    --> src/bin/generics/main.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn largest_clone<T: PartialOrd + Clone>(list: &[T]) -> T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_using_return_ref`
[INFO] [stdout]    --> src/bin/generics/main.rs:118:4
[INFO] [stdout]     |
[INFO] [stdout] 118 | fn largest_using_return_ref<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]    --> src/bin/generics/main.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 130 | struct Pair<T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/bin/generics/main.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 136 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]    --> src/bin/generics/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 142 |     fn cmp_display(&self) { // fn is only implement when generic type of T conform to PartialOrd and Display trait
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait method `summarizeDef` should have a snake case name
[INFO] [stdout]   --> src/bin/generics/traits.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn summarizeDef(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `summarize_def`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `Command { std: "docker" "inspect" "9f3121ea580440ff294e19a392c4757038a6386cd30b213853f22cb7a273aeb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f3121ea580440ff294e19a392c4757038a6386cd30b213853f22cb7a273aeb2", kill_on_drop: false }`
[INFO] [stdout] 9f3121ea580440ff294e19a392c4757038a6386cd30b213853f22cb7a273aeb2