[INFO] cloning repository https://github.com/jssandh2/rust-systems
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jssandh2/rust-systems" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjssandh2%2Frust-systems", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjssandh2%2Frust-systems'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8aa595ec1d2e3e73ce837435c99a87ad84324bbb
[INFO] checking jssandh2/rust-systems against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjssandh2%2Frust-systems" "/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/jssandh2/rust-systems on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jssandh2/rust-systems
[INFO] finished tweaking git repo https://github.com/jssandh2/rust-systems
[INFO] tweaked toml for git repo https://github.com/jssandh2/rust-systems written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/jssandh2/rust-systems already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 81f12328f44696bb9b6b746455101b63ce3c5dc3b461771b0211bb9609cd6ad3
[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" "81f12328f44696bb9b6b746455101b63ce3c5dc3b461771b0211bb9609cd6ad3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "81f12328f44696bb9b6b746455101b63ce3c5dc3b461771b0211bb9609cd6ad3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81f12328f44696bb9b6b746455101b63ce3c5dc3b461771b0211bb9609cd6ad3", kill_on_drop: false }`
[INFO] [stdout] 81f12328f44696bb9b6b746455101b63ce3c5dc3b461771b0211bb9609cd6ad3
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9d8d9323f11f7d7dac7863a2311c9d6dfa4d12692ae1b689b4cc992f37918b9d
[INFO] running `Command { std: "docker" "start" "-a" "9d8d9323f11f7d7dac7863a2311c9d6dfa4d12692ae1b689b4cc992f37918b9d", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-systems v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/test/functions.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
[INFO] [stdout]    |             ^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/test/functions.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let x: i32 = diverges();
[INFO] [stdout]    |                  ---------- any code following this expression is unreachable
[INFO] [stdout] 23 |     let x: String = diverges();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `y` is assigned to, but never used
[INFO] [stdout]   --> src/test/functions.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut y = 5;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_y` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/functions.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/test/functions.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
[INFO] [stdout]    |              ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/functions.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let x: i32 = diverges();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/functions.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let x: String = diverges();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/test/functions.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let f: fn(i32) -> i32;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/functions.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let y = f(5, 6);
[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/test/functions.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let z = sum_number(5, 6);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum_number_three`
[INFO] [stdout]  --> src/test/functions.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn sum_number_three(x: i32, y: i32, z:i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/conditionals_and_loops.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let y = if x == 5 { 10 } else { 15 }; // y : i32
[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: `y`
[INFO] [stdout]  --> src/test/data_types.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |    let (y, z) = (1, 2); // Binding that uses _patterns_
[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: `z`
[INFO] [stdout]  --> src/test/data_types.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |    let (y, z) = (1, 2); // Binding that uses _patterns_
[INFO] [stdout]   |            ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]  --> src/test/data_types.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |    let k: i32 = 5; // Binding to _bind_ k to 5, with a static "int 32" type
[INFO] [stdout]   |        ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `xp` is never read
[INFO] [stdout]   --> src/test/data_types.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |    let mut xp = 5;
[INFO] [stdout]    |            ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a` is never read
[INFO] [stdout]   --> src/test/data_types.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |    let mut a: i32 = 8;
[INFO] [stdout]    |            ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/test/data_types.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 |    let a = a; // a is now _immutable_ and *locked* to 10 (util shadowed). 
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/test/data_types.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |    let e = 5;
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/test/data_types.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 |    let e = "I am now a string!"; // e has changed types from i32 --> string
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/test/data_types.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |    let (y, z) = (1, 2); // Binding that uses _patterns_
[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: `z`
[INFO] [stdout]  --> src/test/data_types.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |    let (y, z) = (1, 2); // Binding that uses _patterns_
[INFO] [stdout]   |            ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]  --> src/test/data_types.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |    let k: i32 = 5; // Binding to _bind_ k to 5, with a static "int 32" type
[INFO] [stdout]   |        ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `xp` is never read
[INFO] [stdout]   --> src/test/data_types.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |    let mut xp = 5;
[INFO] [stdout]    |            ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a` is never read
[INFO] [stdout]   --> src/test/data_types.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |    let mut a: i32 = 8;
[INFO] [stdout]    |            ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/test/data_types.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 |    let a = a; // a is now _immutable_ and *locked* to 10 (util shadowed). 
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/test/data_types.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |    let e = 5;
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/test/data_types.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 |    let e = "I am now a string!"; // e has changed types from i32 --> string
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/test/vectors.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let x = Box::new(5);   // This is closer to the Type-Theoretic defn of `List<T>` := Nil | Cons(T, Box(List<T>))
[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: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/test/primitive_types.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let b = (0);  // Normal zero
[INFO] [stdout]    |             ^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/test/primitive_types.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let x = true;
[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: `y`
[INFO] [stdout]  --> src/test/primitive_types.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let y: bool = false;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/test/functions.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
[INFO] [stdout]    |             ^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/test/primitive_types.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let b = (0);  // Normal zero
[INFO] [stdout]    |             ^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/test/primitive_types.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let x = 'x';
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/primitive_types.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let x = 42; // `x` has type `i32`
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/primitive_types.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let y = 1.0; // `y` has type `f64`
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/test/primitive_types.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let a = [1, 2, 3]; // a : [i32; 3]
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]   --> src/test/primitive_types.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let mut m = [1, 2, 3]; // m : [i32; 3]
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `names`
[INFO] [stdout]   --> src/test/primitive_types.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let names = ["Juspreet", "Cook", "Levin"]; // names : [&str; 3]
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_names`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b_duplicate`
[INFO] [stdout]   --> src/test/primitive_types.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let b_duplicate = &b[..];  // A slice containing everything in `a`
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_b_duplicate`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `middle`
[INFO] [stdout]   --> src/test/primitive_types.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let middle = &b[1..4];     // A slice of `a` : [1, 2, 3]
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_middle`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/primitive_types.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let x = (1, "hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/primitive_types.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let y: (i32, &str) = (1, "hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `x` is assigned to, but never used
[INFO] [stdout]   --> src/test/primitive_types.rs:38:13
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let mut x = (1, 2);
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_x` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/test/primitive_types.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     x = y;   // A tuple is assigned to another (mutable) tuple, and type-check => The same Product-Type
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/test/primitive_types.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let a = (0,); // Tuple of arity 1
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/test/primitive_types.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let b = (0);  // Normal zero
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/primitive_types.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let x = tuple.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/primitive_types.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let y = tuple.1;
[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/test/primitive_types.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let z = tuple.2;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/test/functions.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let x: i32 = diverges();
[INFO] [stdout]    |                  ---------- any code following this expression is unreachable
[INFO] [stdout] 23 |     let x: String = diverges();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `y` is assigned to, but never used
[INFO] [stdout]   --> src/test/functions.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut y = 5;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_y` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/functions.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/test/functions.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
[INFO] [stdout]    |              ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/functions.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let x: i32 = diverges();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/functions.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let x: String = diverges();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/test/functions.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let f: fn(i32) -> i32;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/functions.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let y = f(5, 6);
[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/test/functions.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let z = sum_number(5, 6);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum_number_three`
[INFO] [stdout]  --> src/test/functions.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn sum_number_three(x: i32, y: i32, z:i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/test/primitive_types.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let mut m = [1, 2, 3]; // m : [i32; 3]
[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: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/test/primitive_types.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let x = true;
[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: `y`
[INFO] [stdout]  --> src/test/primitive_types.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let y: bool = false;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/test/primitive_types.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let x = 'x';
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/primitive_types.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let x = 42; // `x` has type `i32`
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/primitive_types.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let y = 1.0; // `y` has type `f64`
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/test/primitive_types.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let a = [1, 2, 3]; // a : [i32; 3]
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]   --> src/test/primitive_types.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let mut m = [1, 2, 3]; // m : [i32; 3]
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `names`
[INFO] [stdout]   --> src/test/primitive_types.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let names = ["Juspreet", "Cook", "Levin"]; // names : [&str; 3]
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_names`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b_duplicate`
[INFO] [stdout]   --> src/test/primitive_types.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let b_duplicate = &b[..];  // A slice containing everything in `a`
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_b_duplicate`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `middle`
[INFO] [stdout]   --> src/test/primitive_types.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let middle = &b[1..4];     // A slice of `a` : [1, 2, 3]
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_middle`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/primitive_types.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let x = (1, "hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/primitive_types.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let y: (i32, &str) = (1, "hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `x` is assigned to, but never used
[INFO] [stdout]   --> src/test/primitive_types.rs:38:13
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let mut x = (1, 2);
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_x` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/test/primitive_types.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     x = y;   // A tuple is assigned to another (mutable) tuple, and type-check => The same Product-Type
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/test/primitive_types.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let a = (0,); // Tuple of arity 1
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/test/primitive_types.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let b = (0);  // Normal zero
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/test/primitive_types.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let x = tuple.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/primitive_types.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let y = tuple.1;
[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/test/primitive_types.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let z = tuple.2;
[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/test/primitive_types.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let mut m = [1, 2, 3]; // m : [i32; 3]
[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: function is never used: `foo`
[INFO] [stdout]   --> src/test/primitive_types.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn foo(x: i32) -> i32 { x } // foo : i32 -> i32
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `two_foo`
[INFO] [stdout]   --> src/test/primitive_types.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn two_foo(x: i32, y: i32) -> i32 { x + y } // two_foo : (i32 * i32) -> i32
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/test/vectors.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let x = Box::new(5);   // This is closer to the Type-Theoretic defn of `List<T>` := Nil | Cons(T, Box(List<T>))
[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: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/test/conditionals_and_loops.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let y = if x == 5 { 10 } else { 15 }; // y : i32
[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: 23 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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `Command { std: "docker" "inspect" "9d8d9323f11f7d7dac7863a2311c9d6dfa4d12692ae1b689b4cc992f37918b9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d8d9323f11f7d7dac7863a2311c9d6dfa4d12692ae1b689b4cc992f37918b9d", kill_on_drop: false }`
[INFO] [stdout] 9d8d9323f11f7d7dac7863a2311c9d6dfa4d12692ae1b689b4cc992f37918b9d