[INFO] cloning repository https://github.com/spigelli/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/spigelli/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspigelli%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspigelli%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 49408b1bd04b75e6b58dbf43a6a36fb210665bd4
[INFO] building spigelli/rust-practice against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspigelli%2Frust-practice" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/spigelli/rust-practice on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/spigelli/rust-practice
[INFO] finished tweaking git repo https://github.com/spigelli/rust-practice
[INFO] tweaked toml for git repo https://github.com/spigelli/rust-practice written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/spigelli/rust-practice already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.139
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ff8b232b49a13a1feb17cd6cc0a2543aeeb5b5ce1c09e512b340f23e3472c46
[INFO] running `Command { std: "docker" "start" "-a" "6ff8b232b49a13a1feb17cd6cc0a2543aeeb5b5ce1c09e512b340f23e3472c46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ff8b232b49a13a1feb17cd6cc0a2543aeeb5b5ce1c09e512b340f23e3472c46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ff8b232b49a13a1feb17cd6cc0a2543aeeb5b5ce1c09e512b340f23e3472c46", kill_on_drop: false }`
[INFO] [stdout] 6ff8b232b49a13a1feb17cd6cc0a2543aeeb5b5ce1c09e512b340f23e3472c46
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 484591591d4f16ac61504b2c0cea358e7081ebed19295ad8d2214fae46518944
[INFO] running `Command { std: "docker" "start" "-a" "484591591d4f16ac61504b2c0cea358e7081ebed19295ad8d2214fae46518944", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling slice_type v0.1.0 (/opt/rustwide/workdir/slice_type)
[INFO] [stderr]    Compiling collections v0.1.0 (/opt/rustwide/workdir/collections)
[INFO] [stderr]    Compiling control_flow v0.1.0 (/opt/rustwide/workdir/control_flow)
[INFO] [stderr]    Compiling modules v0.1.0 (/opt/rustwide/workdir/modules)
[INFO] [stderr]    Compiling data_types v0.1.0 (/opt/rustwide/workdir/data_types)
[INFO] [stderr]    Compiling iflet v0.1.0 (/opt/rustwide/workdir/iflet)
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> slice_type/src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let hello = &s[0..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> slice_type/src/main.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let world = &s[6..11];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]  --> slice_type/src/main.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn first_word(s: &str) -> &str {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `slice` is never used
[INFO] [stdout]   --> slice_type/src/main.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn slice() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> iflet/src/main.rs:38:14
[INFO] [stdout]    |
[INFO] [stdout] 38 |         _ => count += 1,
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `configmax` is never used
[INFO] [stdout]  --> iflet/src/main.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn configmax() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> iflet/src/main.rs:19:6
[INFO] [stdout]    |
[INFO] [stdout] 19 | enum UsState {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> iflet/src/main.rs:25:6
[INFO] [stdout]    |
[INFO] [stdout] 25 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> modules/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let c: Asparagus = String::from("
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `coin` is never used
[INFO] [stdout]   --> iflet/src/main.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn coin() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling option_enum_practice v0.1.0 (/opt/rustwide/workdir/option_enum_practice)
[INFO] [stderr]    Compiling ownership v0.1.0 (/opt/rustwide/workdir/ownership)
[INFO] [stderr]    Compiling enum_match v0.1.0 (/opt/rustwide/workdir/enum_match)
[INFO] [stderr]    Compiling enums v0.1.0 (/opt/rustwide/workdir/enums)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> ownership/src/main.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let y = x;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> ownership/src/main.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 43 |         let s2 = s1;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> ownership/src/main.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let s2 = s1.clone();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_rules` is never used
[INFO] [stdout]  --> ownership/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn ownership_rules() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variable_scope` is never used
[INFO] [stdout]   --> ownership/src/main.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn variable_scope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_type` is never used
[INFO] [stdout]   --> ownership/src/main.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn string_type() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_move` is never used
[INFO] [stdout]   --> ownership/src/main.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn data_move() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `consume_example` is never used
[INFO] [stdout]   --> ownership/src/main.rs:93:4
[INFO] [stdout]    |
[INFO] [stdout] 93 | fn consume_example() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_and_give_back` is never used
[INFO] [stdout]    --> ownership/src/main.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn take_and_give_back() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> enums/src/main.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let four = IpAddressKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]  --> enum_match/src/main.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum UsState {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> enums/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let six = IpAddressKind::V6;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `myIp`
[INFO] [stdout]  --> enums/src/main.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let myIp = IpAddress {
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_myIp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> enums/src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct IpAddress{
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 21 |     kind: IpAddressKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 22 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Warning` is never constructed
[INFO] [stdout]   --> enums/src/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | enum Log {
[INFO] [stdout]    |      --- variant in this enum
[INFO] [stdout] 26 |     Info,
[INFO] [stdout] 27 |     Warning,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `myIp` should have a snake case name
[INFO] [stdout]  --> enums/src/main.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let myIp = IpAddress {
[INFO] [stdout]   |         ^^^^ help: convert the identifier to snake case: `my_ip`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> enum_match/src/main.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `value_in_cents` is never used
[INFO] [stdout]   --> enum_match/src/main.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl Coin {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 21 |     fn value_in_cents(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `die` is never used
[INFO] [stdout]   --> enum_match/src/main.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn die() {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling compound_types v0.1.0 (/opt/rustwide/workdir/compound_types)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> compound_types/src/main.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let a = [1, 2, 3, 4, 5];
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling references_and_borrowing v0.1.0 (/opt/rustwide/workdir/references_and_borrowing)
[INFO] [stderr]    Compiling hello_cargo v0.1.0 (/opt/rustwide/workdir/hello_cargo)
[INFO] [stderr]    Compiling variables_and_mutability v0.1.0 (/opt/rustwide/workdir/variables_and_mutability)
[INFO] [stderr]    Compiling structs v0.1.0 (/opt/rustwide/workdir/structs)
[INFO] [stdout] warning: function `referenceString` is never used
[INFO] [stdout]  --> references_and_borrowing/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn referenceString() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> references_and_borrowing/src/main.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutableReference` is never used
[INFO] [stdout]   --> references_and_borrowing/src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn mutableReference() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `referenceString` should have a snake case name
[INFO] [stdout]  --> references_and_borrowing/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn referenceString() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `reference_string`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutableReference` should have a snake case name
[INFO] [stdout]   --> references_and_borrowing/src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn mutableReference() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `mutable_reference`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling functions v0.1.0 (/opt/rustwide/workdir/functions)
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> structs/src/main.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let black = RGB(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `white`
[INFO] [stdout]   --> structs/src/main.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let white = RGB(255, 255, 255);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_white`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RGB` is never constructed
[INFO] [stdout]   --> structs/src/main.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 | struct RGB(u8, u8, u8);
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_struct` is never used
[INFO] [stdout]   --> structs/src/main.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling getrandom v0.2.8
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling guessing_game v0.1.0 (/opt/rustwide/workdir/guessing_game)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.59s
[INFO] running `Command { std: "docker" "inspect" "484591591d4f16ac61504b2c0cea358e7081ebed19295ad8d2214fae46518944", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "484591591d4f16ac61504b2c0cea358e7081ebed19295ad8d2214fae46518944", kill_on_drop: false }`
[INFO] [stdout] 484591591d4f16ac61504b2c0cea358e7081ebed19295ad8d2214fae46518944
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a231adc25b910e1947a479d6caf0608712405197a63993c8d51e7b9d7723413
[INFO] running `Command { std: "docker" "start" "-a" "3a231adc25b910e1947a479d6caf0608712405197a63993c8d51e7b9d7723413", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling modules v0.1.0 (/opt/rustwide/workdir/modules)
[INFO] [stderr]    Compiling collections v0.1.0 (/opt/rustwide/workdir/collections)
[INFO] [stderr]    Compiling enum_match v0.1.0 (/opt/rustwide/workdir/enum_match)
[INFO] [stderr]    Compiling enums v0.1.0 (/opt/rustwide/workdir/enums)
[INFO] [stderr]    Compiling structs v0.1.0 (/opt/rustwide/workdir/structs)
[INFO] [stderr]    Compiling slice_type v0.1.0 (/opt/rustwide/workdir/slice_type)
[INFO] [stderr]    Compiling data_types v0.1.0 (/opt/rustwide/workdir/data_types)
[INFO] [stderr]    Compiling guessing_game v0.1.0 (/opt/rustwide/workdir/guessing_game)
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> modules/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let c: Asparagus = String::from("
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> enums/src/main.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let four = IpAddressKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> enums/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let six = IpAddressKind::V6;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `myIp`
[INFO] [stdout]  --> enums/src/main.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let myIp = IpAddress {
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_myIp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> enums/src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct IpAddress{
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 21 |     kind: IpAddressKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 22 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> structs/src/main.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let black = RGB(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `white`
[INFO] [stdout]   --> structs/src/main.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let white = RGB(255, 255, 255);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_white`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Warning` is never constructed
[INFO] [stdout]   --> enums/src/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | enum Log {
[INFO] [stdout]    |      --- variant in this enum
[INFO] [stdout] 26 |     Info,
[INFO] [stdout] 27 |     Warning,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `myIp` should have a snake case name
[INFO] [stdout]  --> enums/src/main.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let myIp = IpAddress {
[INFO] [stdout]   |         ^^^^ help: convert the identifier to snake case: `my_ip`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RGB` is never constructed
[INFO] [stdout]   --> structs/src/main.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 | struct RGB(u8, u8, u8);
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_struct` is never used
[INFO] [stdout]   --> structs/src/main.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]  --> enum_match/src/main.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum UsState {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> enum_match/src/main.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `value_in_cents` is never used
[INFO] [stdout]   --> enum_match/src/main.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl Coin {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 21 |     fn value_in_cents(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `die` is never used
[INFO] [stdout]   --> enum_match/src/main.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn die() {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> slice_type/src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let hello = &s[0..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> slice_type/src/main.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let world = &s[6..11];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]  --> slice_type/src/main.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn first_word(s: &str) -> &str {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `slice` is never used
[INFO] [stdout]   --> slice_type/src/main.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn slice() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling variables_and_mutability v0.1.0 (/opt/rustwide/workdir/variables_and_mutability)
[INFO] [stderr]    Compiling option_enum_practice v0.1.0 (/opt/rustwide/workdir/option_enum_practice)
[INFO] [stderr]    Compiling control_flow v0.1.0 (/opt/rustwide/workdir/control_flow)
[INFO] [stderr]    Compiling functions v0.1.0 (/opt/rustwide/workdir/functions)
[INFO] [stderr]    Compiling hello_cargo v0.1.0 (/opt/rustwide/workdir/hello_cargo)
[INFO] [stderr]    Compiling references_and_borrowing v0.1.0 (/opt/rustwide/workdir/references_and_borrowing)
[INFO] [stderr]    Compiling compound_types v0.1.0 (/opt/rustwide/workdir/compound_types)
[INFO] [stderr]    Compiling ownership v0.1.0 (/opt/rustwide/workdir/ownership)
[INFO] [stdout] warning: function `referenceString` is never used
[INFO] [stdout]  --> references_and_borrowing/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn referenceString() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> references_and_borrowing/src/main.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutableReference` is never used
[INFO] [stdout]   --> references_and_borrowing/src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn mutableReference() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `referenceString` should have a snake case name
[INFO] [stdout]  --> references_and_borrowing/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn referenceString() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `reference_string`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutableReference` should have a snake case name
[INFO] [stdout]   --> references_and_borrowing/src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn mutableReference() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `mutable_reference`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> compound_types/src/main.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let a = [1, 2, 3, 4, 5];
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> ownership/src/main.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let y = x;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> ownership/src/main.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 43 |         let s2 = s1;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> ownership/src/main.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let s2 = s1.clone();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_rules` is never used
[INFO] [stdout]  --> ownership/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn ownership_rules() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variable_scope` is never used
[INFO] [stdout]   --> ownership/src/main.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn variable_scope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_type` is never used
[INFO] [stdout]   --> ownership/src/main.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn string_type() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_move` is never used
[INFO] [stdout]   --> ownership/src/main.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn data_move() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `consume_example` is never used
[INFO] [stdout]   --> ownership/src/main.rs:93:4
[INFO] [stdout]    |
[INFO] [stdout] 93 | fn consume_example() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_and_give_back` is never used
[INFO] [stdout]    --> ownership/src/main.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn take_and_give_back() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling iflet v0.1.0 (/opt/rustwide/workdir/iflet)
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> iflet/src/main.rs:38:14
[INFO] [stdout]    |
[INFO] [stdout] 38 |         _ => count += 1,
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `configmax` is never used
[INFO] [stdout]  --> iflet/src/main.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn configmax() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> iflet/src/main.rs:19:6
[INFO] [stdout]    |
[INFO] [stdout] 19 | enum UsState {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> iflet/src/main.rs:25:6
[INFO] [stdout]    |
[INFO] [stdout] 25 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `coin` is never used
[INFO] [stdout]   --> iflet/src/main.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn coin() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.45s
[INFO] running `Command { std: "docker" "inspect" "3a231adc25b910e1947a479d6caf0608712405197a63993c8d51e7b9d7723413", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a231adc25b910e1947a479d6caf0608712405197a63993c8d51e7b9d7723413", kill_on_drop: false }`
[INFO] [stdout] 3a231adc25b910e1947a479d6caf0608712405197a63993c8d51e7b9d7723413