[INFO] cloning repository https://github.com/ferran1/ex-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ferran1/ex-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fferran1%2Fex-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fferran1%2Fex-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 66e7ef7ee59767150348ab69a2da5eff0feccda9
[INFO] testing ferran1/ex-rust against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fferran1%2Fex-rust" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ferran1/ex-rust on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ferran1/ex-rust
[INFO] finished tweaking git repo https://github.com/ferran1/ex-rust
[INFO] tweaked toml for git repo https://github.com/ferran1/ex-rust written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/ferran1/ex-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 49e33468357aedaa487993e450f1fdd91af1abf84e081f910a1263fe8c54f871
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "49e33468357aedaa487993e450f1fdd91af1abf84e081f910a1263fe8c54f871", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "49e33468357aedaa487993e450f1fdd91af1abf84e081f910a1263fe8c54f871", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49e33468357aedaa487993e450f1fdd91af1abf84e081f910a1263fe8c54f871", kill_on_drop: false }`
[INFO] [stdout] 49e33468357aedaa487993e450f1fdd91af1abf84e081f910a1263fe8c54f871
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1d8ff717c7fb78233d97d951ac15b70920a561d1d94870c16a92a5c1f7da2795
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1d8ff717c7fb78233d97d951ac15b70920a561d1d94870c16a92a5c1f7da2795", kill_on_drop: false }`
[INFO] [stderr]    Compiling ex-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]  --> src/bin/match.rs:9:10
[INFO] [stdout]   |
[INFO] [stdout] 9 |         1...5 => println!("It's one from 1 to 5"),
[INFO] [stdout]   |          ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]   --> src/bin/match.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     if let number = 1 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]    = help: consider replacing the `if let` with a `let`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]   --> src/bin/match.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     if let number = 1 {
[INFO] [stdout]    |            ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `third_value`
[INFO] [stdout]   --> src/bin/vectors.rs:13:14
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Some(third_value) => println!("It's purple!"),
[INFO] [stdout]    |              ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_third_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/bin/shadowing.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |         let x = x + 5;
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home_address`
[INFO] [stdout]  --> src/bin/enums.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let home_address = IPAddressKind::V4(127, 0, 0, 1);
[INFO] [stdout]   |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_home_address`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]  --> src/bin/enums.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let loopback = IPAddr::V6(String::from("::1")); // Call the type alias "IPAddr" of the
[INFO] [stdout]   |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enums.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/bin/references_borrowing.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let a = y; /* Ownership is being "moved" to the variable a because the value
[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: `d`
[INFO] [stdout]   --> src/bin/references_borrowing.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let d = &c;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/references_borrowing.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let e = &c; // variables d and e borrow from the variable c,
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/references_borrowing.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut c = String::from("Hello world!");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let a = 30; // i = signed integer
[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: `b`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut b : u32 = 35; // u = unsigned integer, mut = mutable
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let c = 2.0; // Default type = f64
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let d: f32 = 20.5; // Variables can always be type annotated
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let e = true;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let f = 'F';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `my_str`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let my_str = "This is a &str";
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `my_string`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let my_string = String::from("This is a String");
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let sum = 5 + 10;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difference`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let difference = 95.5 - 4.3;
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `product`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let product = 4 * 30;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `quotient`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let quotient = 56.7 / 32.2;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `remainder`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let remainder = 43 % 5;
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_remainder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let (x, y, z) = tup; // Deconstruct tuple to create bindings
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:84:16
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let (x, y, z) = tup; // Deconstruct tuple to create bindings
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/primitives_constants.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut b : u32 = 35; // u = unsigned integer, mut = mutable
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings 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: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.66s
[INFO] running `Command { std: "docker" "inspect" "1d8ff717c7fb78233d97d951ac15b70920a561d1d94870c16a92a5c1f7da2795", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d8ff717c7fb78233d97d951ac15b70920a561d1d94870c16a92a5c1f7da2795", kill_on_drop: false }`
[INFO] [stdout] 1d8ff717c7fb78233d97d951ac15b70920a561d1d94870c16a92a5c1f7da2795
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb4dcb83dee3882075b75e19d10e6d259311cbca9ec9dd6f8145e3975b232518
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fb4dcb83dee3882075b75e19d10e6d259311cbca9ec9dd6f8145e3975b232518", kill_on_drop: false }`
[INFO] [stderr]    Compiling ex-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]  --> src/bin/match.rs:9:10
[INFO] [stdout]   |
[INFO] [stdout] 9 |         1...5 => println!("It's one from 1 to 5"),
[INFO] [stdout]   |          ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]   --> src/bin/match.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     if let number = 1 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]    = help: consider replacing the `if let` with a `let`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]   --> src/bin/match.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     if let number = 1 {
[INFO] [stdout]    |            ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `third_value`
[INFO] [stdout]   --> src/bin/vectors.rs:13:14
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Some(third_value) => println!("It's purple!"),
[INFO] [stdout]    |              ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_third_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/bin/shadowing.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |         let x = x + 5;
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/bin/references_borrowing.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let a = y; /* Ownership is being "moved" to the variable a because the value
[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: `d`
[INFO] [stdout]   --> src/bin/references_borrowing.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let d = &c;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/references_borrowing.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let e = &c; // variables d and e borrow from the variable c,
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/references_borrowing.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut c = String::from("Hello world!");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home_address`
[INFO] [stdout]  --> src/bin/enums.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let home_address = IPAddressKind::V4(127, 0, 0, 1);
[INFO] [stdout]   |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_home_address`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]  --> src/bin/enums.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let loopback = IPAddr::V6(String::from("::1")); // Call the type alias "IPAddr" of the
[INFO] [stdout]   |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enums.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let a = 30; // i = signed integer
[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: `b`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut b : u32 = 35; // u = unsigned integer, mut = mutable
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let c = 2.0; // Default type = f64
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let d: f32 = 20.5; // Variables can always be type annotated
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let e = true;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let f = 'F';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `my_str`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let my_str = "This is a &str";
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `my_string`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let my_string = String::from("This is a String");
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let sum = 5 + 10;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difference`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let difference = 95.5 - 4.3;
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `product`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let product = 4 * 30;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `quotient`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let quotient = 56.7 / 32.2;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `remainder`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let remainder = 43 % 5;
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_remainder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let (x, y, z) = tup; // Deconstruct tuple to create bindings
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/bin/primitives_constants.rs:84:16
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let (x, y, z) = tup; // Deconstruct tuple to create bindings
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/primitives_constants.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut b : u32 = 35; // u = unsigned integer, mut = mutable
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.98s
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "fb4dcb83dee3882075b75e19d10e6d259311cbca9ec9dd6f8145e3975b232518", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb4dcb83dee3882075b75e19d10e6d259311cbca9ec9dd6f8145e3975b232518", kill_on_drop: false }`
[INFO] [stdout] fb4dcb83dee3882075b75e19d10e6d259311cbca9ec9dd6f8145e3975b232518
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c92a6896345bdd7c34a175ef1c8c4b03ca166b89f67e9396c738eeec053833dd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c92a6896345bdd7c34a175ef1c8c4b03ca166b89f67e9396c738eeec053833dd", kill_on_drop: false }`
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]  --> src/bin/match.rs:9:10
[INFO] [stderr]   |
[INFO] [stderr] 9 |         1...5 => println!("It's one from 1 to 5"),
[INFO] [stderr]   |          ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: irrefutable `if let` pattern
[INFO] [stderr]   --> src/bin/match.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 |     if let number = 1 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stderr]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stderr]    = help: consider replacing the `if let` with a `let`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `number`
[INFO] [stderr]   --> src/bin/match.rs:24:12
[INFO] [stderr]    |
[INFO] [stderr] 24 |     if let number = 1 {
[INFO] [stderr]    |            ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `ex-rust` (bin "match" test) generated 3 warnings
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/bin/shadowing.rs:7:13
[INFO] [stderr]   |
[INFO] [stderr] 7 |         let x = x + 5;
[INFO] [stderr]   |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home_address`
[INFO] [stderr]  --> src/bin/enums.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let home_address = IPAddressKind::V4(127, 0, 0, 1);
[INFO] [stderr]   |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_home_address`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]  --> src/bin/enums.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let loopback = IPAddr::V6(String::from("::1")); // Call the type alias "IPAddr" of the
[INFO] [stderr]   |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `call`
[INFO] [stderr]   --> src/bin/enums.rs:33:8
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn call(&self) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let a = 30; // i = signed integer
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let mut b : u32 = 35; // u = unsigned integer, mut = mutable
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |     let c = 2.0; // Default type = f64
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let d: f32 = 20.5; // Variables can always be type annotated
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let e = true;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |     let f = 'F';
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `my_str`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let my_str = "This is a &str";
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_str`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `my_string`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 |     let my_string = String::from("This is a String");
[INFO] [stderr]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sum`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 |     let sum = 5 + 10;
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `difference`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let difference = 95.5 - 4.3;
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `product`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let product = 4 * 30;
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `quotient`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:56:9
[INFO] [stderr]    |
[INFO] [stderr] 56 |     let quotient = 56.7 / 32.2;
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `remainder`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let remainder = 43 % 5;
[INFO] [stderr]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_remainder`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:84:13
[INFO] [stderr]    |
[INFO] [stderr] 84 |     let (x, y, z) = tup; // Deconstruct tuple to create bindings
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/bin/primitives_constants.rs:84:16
[INFO] [stderr]    |
[INFO] [stderr] 84 |     let (x, y, z) = tup; // Deconstruct tuple to create bindings
[INFO] [stderr]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/primitives_constants.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let mut b : u32 = 35; // u = unsigned integer, mut = mutable
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `third_value`
[INFO] [stderr]   --> src/bin/vectors.rs:13:14
[INFO] [stderr]    |
[INFO] [stderr] 13 |         Some(third_value) => println!("It's purple!"),
[INFO] [stderr]    |              ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_third_value`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]  --> src/bin/references_borrowing.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let a = y; /* Ownership is being "moved" to the variable a because the value
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d`
[INFO] [stderr]   --> src/bin/references_borrowing.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let d = &c;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/bin/references_borrowing.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let e = &c; // variables d and e borrow from the variable c,
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/references_borrowing.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut c = String::from("Hello world!");
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `ex-rust` (bin "shadowing" test) generated 1 warning
[INFO] [stderr] warning: `ex-rust` (bin "enums" test) generated 3 warnings
[INFO] [stderr] warning: `ex-rust` (bin "primitives_constants" test) generated 16 warnings
[INFO] [stderr] warning: `ex-rust` (bin "vectors" test) generated 1 warning
[INFO] [stderr] warning: `ex-rust` (bin "references_borrowing" test) generated 4 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/enums-d8233e25118718d2)
[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 (/opt/rustwide/target/debug/deps/ex_rust-33cc52215fd1c438)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/functions_methods-376b401814d390e0)
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/if_statements-4866e13370e9cb4e)
[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 (/opt/rustwide/target/debug/deps/loops-329a9bbf24ca8b63)
[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] 
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[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/match-c1f9756c9fe503dd)
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[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/slices-5659d94038bdf638)
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[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
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[INFO] running `Command { std: "docker" "inspect" "c92a6896345bdd7c34a175ef1c8c4b03ca166b89f67e9396c738eeec053833dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c92a6896345bdd7c34a175ef1c8c4b03ca166b89f67e9396c738eeec053833dd", kill_on_drop: false }`
[INFO] [stdout] c92a6896345bdd7c34a175ef1c8c4b03ca166b89f67e9396c738eeec053833dd