[INFO] cloning repository https://github.com/ironscar/rust-starter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ironscar/rust-starter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fironscar%2Frust-starter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fironscar%2Frust-starter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7181551f6663a59fa884a4a40c5001489367a065
[INFO] testing ironscar/rust-starter against 1.99.0-beta.1+cargoflags=--release for beta-release-1.99-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fironscar%2Frust-starter" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ironscar/rust-starter
[INFO] finished tweaking git repo https://github.com/ironscar/rust-starter
[INFO] tweaked toml for git repo https://github.com/ironscar/rust-starter written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ironscar/rust-starter on toolchain 1.99.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ironscar/rust-starter 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" "+1.99.0-beta.1" "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-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9
[INFO] running `Command { std: "docker" "start" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling automl_factory v0.1.0 (/opt/rustwide/workdir/automl_factory)
[INFO] [stderr]    Compiling rust_trials v0.1.0 (/opt/rustwide/workdir/rust_trials)
[INFO] [stderr]    Compiling rust_tutorials v0.1.0 (/opt/rustwide/workdir/rust_tutorials)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> rust_trials/src/trials/linked_list.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let mut display_str = self.val.to_string();
[INFO] [stdout]    |             ----^^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> rust_trials/src/trials/linked_list.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let mut tail = head.push(3);
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]  --> rust_tutorials/src/tutorials/ownership.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 |     if (len_method == 1) {
[INFO] [stdout]   |        ^               ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 8 -     if (len_method == 1) {
[INFO] [stdout] 8 +     if len_method == 1 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:11:15
[INFO] [stdout]    |
[INFO] [stdout] 11 |     } else if (len_method == 2) {
[INFO] [stdout]    |               ^               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 11 -     } else if (len_method == 2) {
[INFO] [stdout] 11 +     } else if len_method == 2 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 |     } else if (len_method == 3) {
[INFO] [stdout]    |               ^               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 15 -     } else if (len_method == 3) {
[INFO] [stdout] 15 +     } else if len_method == 3 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `is_common` is never read
[INFO] [stdout]    --> rust_trials/src/trials/basic_problems.rs:124:17
[INFO] [stdout]     |
[INFO] [stdout] 124 |                 is_common = false;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `is_common` is never read
[INFO] [stdout]    --> rust_trials/src/trials/basic_problems.rs:120:17
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 is_common = false;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `result` is assigned to, but never used
[INFO] [stdout]    --> rust_trials/src/trials/basic_problems.rs:177:9
[INFO] [stdout]     |
[INFO] [stdout] 177 |     let mut result = true;
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_result` instead
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]    --> rust_trials/src/trials/basic_problems.rs:184:16
[INFO] [stdout]     |
[INFO] [stdout] 184 |                result = false;
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `prev1` is never read
[INFO] [stdout]   --> rust_tutorials/src/tutorials/control_flow.rs:64:26
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let mut prev1: u16 = 0;
[INFO] [stdout]    |                          ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 78 |         prev1 = prev2;
[INFO] [stdout]    |         ------------- `prev1` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut s = String::from("hello world");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `space2` is never read
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:55:29
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let mut space2: usize = 0;
[INFO] [stdout]    |                             ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 62 |                 space2 = i;
[INFO] [stdout]    |                 ---------- `space2` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `space2` is never read
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:62:17
[INFO] [stdout]    |
[INFO] [stdout] 62 |                 space2 = i;
[INFO] [stdout]    |                 ^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 70 |     space2 = s.len();
[INFO] [stdout]    |     ---------------- `space2` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unprintable` is never constructed
[INFO] [stdout]   --> rust_tutorials/src/tutorials/printers.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Unprintable(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]   --> rust_tutorials/src/tutorials/printers.rs:47:23
[INFO] [stdout]    |
[INFO] [stdout] 47 | struct DebugPrintable(i32);
[INFO] [stdout]    |        -------------- ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `DebugPrintable` 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 `email` is never read
[INFO] [stdout]  --> rust_tutorials/src/tutorials/structs.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 6 |     email: String
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Red` and `Blue` are never constructed
[INFO] [stdout]    --> rust_tutorials/src/tutorials/types.rs:162:5
[INFO] [stdout]     |
[INFO] [stdout] 161 | enum Color {
[INFO] [stdout]     |      ----- variants in this enum
[INFO] [stdout] 162 |     Red = 0xff0000,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 163 |     Green = 0x00ff00,
[INFO] [stdout] 164 |     Blue = 0x0000ff
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `default_panic_demo` is never used
[INFO] [stdout]  --> rust_tutorials/src/tutorials/error_handling.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn default_panic_demo() -> i32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recoverable_errors_demo_1` is never used
[INFO] [stdout]   --> rust_tutorials/src/tutorials/error_handling.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn recoverable_errors_demo_1() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recoverable_errors_demo_2` is never used
[INFO] [stdout]   --> rust_tutorials/src/tutorials/error_handling.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn recoverable_errors_demo_2() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "test" "--frozen" "--no-run" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling automl_factory v0.1.0 (/opt/rustwide/workdir/automl_factory)
[INFO] [stderr]    Compiling rust_trials v0.1.0 (/opt/rustwide/workdir/rust_trials)
[INFO] [stderr]    Compiling rust_tutorials v0.1.0 (/opt/rustwide/workdir/rust_tutorials)
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]  --> rust_tutorials/src/tutorials/ownership.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 |     if (len_method == 1) {
[INFO] [stdout]   |        ^               ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 8 -     if (len_method == 1) {
[INFO] [stdout] 8 +     if len_method == 1 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:11:15
[INFO] [stdout]    |
[INFO] [stdout] 11 |     } else if (len_method == 2) {
[INFO] [stdout]    |               ^               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 11 -     } else if (len_method == 2) {
[INFO] [stdout] 11 +     } else if len_method == 2 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 |     } else if (len_method == 3) {
[INFO] [stdout]    |               ^               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 15 -     } else if (len_method == 3) {
[INFO] [stdout] 15 +     } else if len_method == 3 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> rust_trials/src/trials/linked_list.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let mut display_str = self.val.to_string();
[INFO] [stdout]    |             ----^^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> rust_trials/src/trials/linked_list.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let mut tail = head.push(3);
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `is_common` is never read
[INFO] [stdout]    --> rust_trials/src/trials/basic_problems.rs:124:17
[INFO] [stdout]     |
[INFO] [stdout] 124 |                 is_common = false;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `is_common` is never read
[INFO] [stdout]    --> rust_trials/src/trials/basic_problems.rs:120:17
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 is_common = false;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `result` is assigned to, but never used
[INFO] [stdout]    --> rust_trials/src/trials/basic_problems.rs:177:9
[INFO] [stdout]     |
[INFO] [stdout] 177 |     let mut result = true;
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_result` instead
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]    --> rust_trials/src/trials/basic_problems.rs:184:16
[INFO] [stdout]     |
[INFO] [stdout] 184 |                result = false;
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `prev1` is never read
[INFO] [stdout]   --> rust_tutorials/src/tutorials/control_flow.rs:64:26
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let mut prev1: u16 = 0;
[INFO] [stdout]    |                          ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 78 |         prev1 = prev2;
[INFO] [stdout]    |         ------------- `prev1` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut s = String::from("hello world");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `space2` is never read
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:55:29
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let mut space2: usize = 0;
[INFO] [stdout]    |                             ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 62 |                 space2 = i;
[INFO] [stdout]    |                 ---------- `space2` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `space2` is never read
[INFO] [stdout]   --> rust_tutorials/src/tutorials/ownership.rs:62:17
[INFO] [stdout]    |
[INFO] [stdout] 62 |                 space2 = i;
[INFO] [stdout]    |                 ^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 70 |     space2 = s.len();
[INFO] [stdout]    |     ---------------- `space2` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unprintable` is never constructed
[INFO] [stdout]   --> rust_tutorials/src/tutorials/printers.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Unprintable(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]   --> rust_tutorials/src/tutorials/printers.rs:47:23
[INFO] [stdout]    |
[INFO] [stdout] 47 | struct DebugPrintable(i32);
[INFO] [stdout]    |        -------------- ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `DebugPrintable` 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 `email` is never read
[INFO] [stdout]  --> rust_tutorials/src/tutorials/structs.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 6 |     email: String
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Red` and `Blue` are never constructed
[INFO] [stdout]    --> rust_tutorials/src/tutorials/types.rs:162:5
[INFO] [stdout]     |
[INFO] [stdout] 161 | enum Color {
[INFO] [stdout]     |      ----- variants in this enum
[INFO] [stdout] 162 |     Red = 0xff0000,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 163 |     Green = 0x00ff00,
[INFO] [stdout] 164 |     Blue = 0x0000ff
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `default_panic_demo` is never used
[INFO] [stdout]  --> rust_tutorials/src/tutorials/error_handling.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn default_panic_demo() -> i32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recoverable_errors_demo_1` is never used
[INFO] [stdout]   --> rust_tutorials/src/tutorials/error_handling.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn recoverable_errors_demo_1() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recoverable_errors_demo_2` is never used
[INFO] [stdout]   --> rust_tutorials/src/tutorials/error_handling.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn recoverable_errors_demo_2() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "test" "--frozen" "--release", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> rust_trials/src/trials/linked_list.rs:67:13
[INFO] [stderr]    |
[INFO] [stderr] 67 |         let mut display_str = self.val.to_string();
[INFO] [stderr]    |             ----^^^^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> rust_trials/src/trials/linked_list.rs:91:9
[INFO] [stderr]    |
[INFO] [stderr] 91 |     let mut tail = head.push(3);
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `is_common` is never read
[INFO] [stderr]    --> rust_trials/src/trials/basic_problems.rs:124:17
[INFO] [stderr]     |
[INFO] [stderr] 124 |                 is_common = false;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `is_common` is never read
[INFO] [stderr]    --> rust_trials/src/trials/basic_problems.rs:120:17
[INFO] [stderr]     |
[INFO] [stderr] 120 |                 is_common = false;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `result` is assigned to, but never used
[INFO] [stderr]    --> rust_trials/src/trials/basic_problems.rs:177:9
[INFO] [stderr]     |
[INFO] [stderr] 177 |     let mut result = true;
[INFO] [stderr]     |         ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_result` instead
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `result` is never read
[INFO] [stderr]    --> rust_trials/src/trials/basic_problems.rs:184:16
[INFO] [stderr]     |
[INFO] [stderr] 184 |                result = false;
[INFO] [stderr]     |                ^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_trials` (bin "rust_trials" test) generated 6 warnings (run `cargo fix --bin "rust_trials" -p rust_trials --tests` to apply 2 suggestions)
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]  --> rust_tutorials/src/tutorials/ownership.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 |     if (len_method == 1) {
[INFO] [stderr]   |        ^               ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr] 8 -     if (len_method == 1) {
[INFO] [stderr] 8 +     if len_method == 1 {
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> rust_tutorials/src/tutorials/ownership.rs:11:15
[INFO] [stderr]    |
[INFO] [stderr] 11 |     } else if (len_method == 2) {
[INFO] [stderr]    |               ^               ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 11 -     } else if (len_method == 2) {
[INFO] [stderr] 11 +     } else if len_method == 2 {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> rust_tutorials/src/tutorials/ownership.rs:15:15
[INFO] [stderr]    |
[INFO] [stderr] 15 |     } else if (len_method == 3) {
[INFO] [stderr]    |               ^               ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 15 -     } else if (len_method == 3) {
[INFO] [stderr] 15 +     } else if len_method == 3 {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `prev1` is never read
[INFO] [stderr]   --> rust_tutorials/src/tutorials/control_flow.rs:64:26
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let mut prev1: u16 = 0;
[INFO] [stderr]    |                          ^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 78 |         prev1 = prev2;
[INFO] [stderr]    |         ------------- `prev1` is overwritten here before the previous value is read
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> rust_tutorials/src/tutorials/ownership.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |     let mut s = String::from("hello world");
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `space2` is never read
[INFO] [stderr]   --> rust_tutorials/src/tutorials/ownership.rs:55:29
[INFO] [stderr]    |
[INFO] [stderr] 55 |     let mut space2: usize = 0;
[INFO] [stderr]    |                             ^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 62 |                 space2 = i;
[INFO] [stderr]    |                 ---------- `space2` is overwritten here before the previous value is read
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `space2` is never read
[INFO] [stderr]   --> rust_tutorials/src/tutorials/ownership.rs:62:17
[INFO] [stderr]    |
[INFO] [stderr] 62 |                 space2 = i;
[INFO] [stderr]    |                 ^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 70 |     space2 = s.len();
[INFO] [stderr]    |     ---------------- `space2` is overwritten here before the previous value is read
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Unprintable` is never constructed
[INFO] [stderr]   --> rust_tutorials/src/tutorials/printers.rs:43:8
[INFO] [stderr]    |
[INFO] [stderr] 43 | struct Unprintable(i32);
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> rust_tutorials/src/tutorials/printers.rs:47:23
[INFO] [stderr]    |
[INFO] [stderr] 47 | struct DebugPrintable(i32);
[INFO] [stderr]    |        -------------- ^^^
[INFO] [stderr]    |        |
[INFO] [stderr]    |        field in this struct
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider removing this field
[INFO] [stderr]    = note: `DebugPrintable` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: field `email` is never read
[INFO] [stderr]  --> rust_tutorials/src/tutorials/structs.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct User {
[INFO] [stderr]   |        ---- field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 6 |     email: String
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Red` and `Blue` are never constructed
[INFO] [stderr]    --> rust_tutorials/src/tutorials/types.rs:162:5
[INFO] [stderr]     |
[INFO] [stderr] 161 | enum Color {
[INFO] [stderr]     |      ----- variants in this enum
[INFO] [stderr] 162 |     Red = 0xff0000,
[INFO] [stderr]     |     ^^^
[INFO] [stderr] 163 |     Green = 0x00ff00,
[INFO] [stderr] 164 |     Blue = 0x0000ff
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `default_panic_demo` is never used
[INFO] [stderr]  --> rust_tutorials/src/tutorials/error_handling.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn default_panic_demo() -> i32 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `recoverable_errors_demo_1` is never used
[INFO] [stderr]   --> rust_tutorials/src/tutorials/error_handling.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn recoverable_errors_demo_1() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `recoverable_errors_demo_2` is never used
[INFO] [stderr]   --> rust_tutorials/src/tutorials/error_handling.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub fn recoverable_errors_demo_2() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_tutorials` (bin "rust_tutorials" test) generated 14 warnings (run `cargo fix --bin "rust_tutorials" -p rust_tutorials --tests` to apply 4 suggestions)
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/automl_factory-48e4f88dce044731)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/rust_trials-6e555c61230c3a0f)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/rust_tutorials-0ea3d1b0eb6afbb6)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9", kill_on_drop: false }`
[INFO] [stdout] ef9a8fee1a7f48c98b1814d0b3c2417bbc97c31329baf1202a1d85ba631cbcb9
