Dec 19 14:52:48.492 INFO checking jssandh2/rust-systems against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 14:52:48.492 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-7/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/jssandh2/rust-systems:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 14:52:48.780 INFO [stdout] 3ed91d197b24c2a6304515bfe9163583b4fd28bcf4b54173c40c41a86c6972b2
Dec 19 14:52:48.788 INFO running `"docker" "start" "-a" "3ed91d197b24c2a6304515bfe9163583b4fd28bcf4b54173c40c41a86c6972b2"`
Dec 19 14:52:50.216 INFO [stderr]     Checking rust-systems v0.0.1 (/opt/crater/workdir)
Dec 19 14:52:50.448 INFO [stderr] warning: unnecessary parentheses around assigned value
Dec 19 14:52:50.448 INFO [stderr]   --> src/test/primitive_types.rs:47:13
Dec 19 14:52:50.448 INFO [stderr]    |
Dec 19 14:52:50.448 INFO [stderr] 47 |     let b = (0);  // Normal zero
Dec 19 14:52:50.448 INFO [stderr]    |             ^^^ help: remove these parentheses
Dec 19 14:52:50.448 INFO [stderr]    |
Dec 19 14:52:50.448 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Dec 19 14:52:50.448 INFO [stderr] 
Dec 19 14:52:50.448 INFO [stderr] warning: unnecessary parentheses around assigned value
Dec 19 14:52:50.448 INFO [stderr]   --> src/test/functions.rs:20:13
Dec 19 14:52:50.448 INFO [stderr]    |
Dec 19 14:52:50.448 INFO [stderr] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
Dec 19 14:52:50.448 INFO [stderr]    |             ^^^^^^^ help: remove these parentheses
Dec 19 14:52:50.448 INFO [stderr]    |
Dec 19 14:52:50.448 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Dec 19 14:52:50.448 INFO [stderr] 
Dec 19 14:52:50.480 INFO [stderr] warning: unreachable statement
Dec 19 14:52:50.480 INFO [stderr]   --> src/test/functions.rs:23:5
Dec 19 14:52:50.480 INFO [stderr]    |
Dec 19 14:52:50.480 INFO [stderr] 23 |     let x: String = diverges();
Dec 19 14:52:50.480 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 14:52:50.480 INFO [stderr]    |
Dec 19 14:52:50.480 INFO [stderr]    = note: #[warn(unreachable_code)] on by default
Dec 19 14:52:50.480 INFO [stderr] 
Dec 19 14:52:50.489 INFO [stderr] warning: variable `y` is assigned to, but never used
Dec 19 14:52:50.489 INFO [stderr]   --> src/test/functions.rs:19:13
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr] 19 |     let mut y = 5;
Dec 19 14:52:50.489 INFO [stderr]    |             ^
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 14:52:50.489 INFO [stderr]    = note: consider using `_y` instead
Dec 19 14:52:50.489 INFO [stderr] 
Dec 19 14:52:50.489 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.489 INFO [stderr]   --> src/test/functions.rs:20:9
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
Dec 19 14:52:50.489 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.489 INFO [stderr] 
Dec 19 14:52:50.489 INFO [stderr] warning: value assigned to `y` is never read
Dec 19 14:52:50.489 INFO [stderr]   --> src/test/functions.rs:20:14
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
Dec 19 14:52:50.489 INFO [stderr]    |              ^
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 14:52:50.489 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 14:52:50.489 INFO [stderr] 
Dec 19 14:52:50.489 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.489 INFO [stderr]   --> src/test/functions.rs:22:9
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr] 22 |     let x: i32 = diverges();
Dec 19 14:52:50.489 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.489 INFO [stderr] 
Dec 19 14:52:50.489 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.489 INFO [stderr]   --> src/test/functions.rs:23:9
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr] 23 |     let x: String = diverges();
Dec 19 14:52:50.489 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.489 INFO [stderr] 
Dec 19 14:52:50.489 INFO [stderr] warning: unused variable: `f`
Dec 19 14:52:50.489 INFO [stderr]   --> src/test/functions.rs:28:9
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr] 28 |     let f: fn(i32) -> i32;
Dec 19 14:52:50.489 INFO [stderr]    |         ^ help: consider using `_f` instead
Dec 19 14:52:50.489 INFO [stderr] 
Dec 19 14:52:50.489 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.489 INFO [stderr]   --> src/test/functions.rs:31:9
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr] 31 |     let y = f(5, 6);
Dec 19 14:52:50.489 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.489 INFO [stderr] 
Dec 19 14:52:50.489 INFO [stderr] warning: unused variable: `z`
Dec 19 14:52:50.489 INFO [stderr]   --> src/test/functions.rs:34:9
Dec 19 14:52:50.489 INFO [stderr]    |
Dec 19 14:52:50.489 INFO [stderr] 34 |     let z = sum_number(5, 6);
Dec 19 14:52:50.489 INFO [stderr]    |         ^ help: consider using `_z` instead
Dec 19 14:52:50.489 INFO [stderr] 
Dec 19 14:52:50.494 INFO [stderr] warning: function is never used: `sum_number_three`
Dec 19 14:52:50.494 INFO [stderr]  --> src/test/functions.rs:9:1
Dec 19 14:52:50.494 INFO [stderr]   |
Dec 19 14:52:50.494 INFO [stderr] 9 | fn sum_number_three(x: i32, y: i32, z:i32) -> i32 {
Dec 19 14:52:50.494 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 14:52:50.494 INFO [stderr]   |
Dec 19 14:52:50.494 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 19 14:52:50.494 INFO [stderr] 
Dec 19 14:52:50.509 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.509 INFO [stderr]  --> src/test/primitive_types.rs:3:9
Dec 19 14:52:50.509 INFO [stderr]   |
Dec 19 14:52:50.509 INFO [stderr] 3 |     let x = true;
Dec 19 14:52:50.509 INFO [stderr]   |         ^ help: consider using `_x` instead
Dec 19 14:52:50.509 INFO [stderr]   |
Dec 19 14:52:50.509 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 14:52:50.509 INFO [stderr] 
Dec 19 14:52:50.509 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.509 INFO [stderr]  --> src/test/primitive_types.rs:4:9
Dec 19 14:52:50.509 INFO [stderr]   |
Dec 19 14:52:50.509 INFO [stderr] 4 |     let y: bool = false;
Dec 19 14:52:50.509 INFO [stderr]   |         ^ help: consider using `_y` instead
Dec 19 14:52:50.509 INFO [stderr] 
Dec 19 14:52:50.509 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.509 INFO [stderr]  --> src/test/primitive_types.rs:7:9
Dec 19 14:52:50.509 INFO [stderr]   |
Dec 19 14:52:50.509 INFO [stderr] 7 |     let x = 'x';
Dec 19 14:52:50.509 INFO [stderr]   |         ^ help: consider using `_x` instead
Dec 19 14:52:50.509 INFO [stderr] 
Dec 19 14:52:50.509 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.509 INFO [stderr]   --> src/test/primitive_types.rs:10:9
Dec 19 14:52:50.509 INFO [stderr]    |
Dec 19 14:52:50.509 INFO [stderr] 10 |     let x = 42; // `x` has type `i32`
Dec 19 14:52:50.509 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.509 INFO [stderr] 
Dec 19 14:52:50.509 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.509 INFO [stderr]   --> src/test/primitive_types.rs:11:9
Dec 19 14:52:50.509 INFO [stderr]    |
Dec 19 14:52:50.509 INFO [stderr] 11 |     let y = 1.0; // `y` has type `f64`
Dec 19 14:52:50.509 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.509 INFO [stderr] 
Dec 19 14:52:50.509 INFO [stderr] warning: unused variable: `a`
Dec 19 14:52:50.509 INFO [stderr]   --> src/test/primitive_types.rs:19:9
Dec 19 14:52:50.509 INFO [stderr]    |
Dec 19 14:52:50.509 INFO [stderr] 19 |     let a = [1, 2, 3]; // a : [i32; 3]
Dec 19 14:52:50.509 INFO [stderr]    |         ^ help: consider using `_a` instead
Dec 19 14:52:50.509 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `m`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:20:13
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 20 |     let mut m = [1, 2, 3]; // m : [i32; 3]
Dec 19 14:52:50.510 INFO [stderr]    |             ^ help: consider using `_m` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `names`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:25:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 25 |     let names = ["Juspreet", "Cook", "Levin"]; // names : [&str; 3]
Dec 19 14:52:50.510 INFO [stderr]    |         ^^^^^ help: consider using `_names` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `b_duplicate`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:30:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 30 |     let b_duplicate = &b[..];  // A slice containing everything in `a`
Dec 19 14:52:50.510 INFO [stderr]    |         ^^^^^^^^^^^ help: consider using `_b_duplicate` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `middle`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:31:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 31 |     let middle = &b[1..4];     // A slice of `a` : [1, 2, 3]
Dec 19 14:52:50.510 INFO [stderr]    |         ^^^^^^ help: consider using `_middle` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:35:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 35 |     let x = (1, "hello");
Dec 19 14:52:50.510 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:36:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 36 |     let y: (i32, &str) = (1, "hello");
Dec 19 14:52:50.510 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: variable `x` is assigned to, but never used
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:38:13
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 38 |     let mut x = (1, 2);
Dec 19 14:52:50.510 INFO [stderr]    |             ^
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr]    = note: consider using `_x` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: value assigned to `x` is never read
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:40:5
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 40 |     x = y;   // A tuple is assigned to another (mutable) tuple, and type-check => The same Product-Type
Dec 19 14:52:50.510 INFO [stderr]    |     ^
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 14:52:50.510 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `a`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:46:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 46 |     let a = (0,); // Tuple of arity 1
Dec 19 14:52:50.510 INFO [stderr]    |         ^ help: consider using `_a` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `b`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:47:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 47 |     let b = (0);  // Normal zero
Dec 19 14:52:50.510 INFO [stderr]    |         ^ help: consider using `_b` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:52:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 52 |     let x = tuple.0;
Dec 19 14:52:50.510 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:53:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 53 |     let y = tuple.1;
Dec 19 14:52:50.510 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.510 INFO [stderr] warning: unused variable: `z`
Dec 19 14:52:50.510 INFO [stderr]   --> src/test/primitive_types.rs:54:9
Dec 19 14:52:50.510 INFO [stderr]    |
Dec 19 14:52:50.510 INFO [stderr] 54 |     let z = tuple.2;
Dec 19 14:52:50.510 INFO [stderr]    |         ^ help: consider using `_z` instead
Dec 19 14:52:50.510 INFO [stderr] 
Dec 19 14:52:50.515 INFO [stderr] warning: variable does not need to be mutable
Dec 19 14:52:50.515 INFO [stderr]   --> src/test/primitive_types.rs:20:9
Dec 19 14:52:50.515 INFO [stderr]    |
Dec 19 14:52:50.515 INFO [stderr] 20 |     let mut m = [1, 2, 3]; // m : [i32; 3]
Dec 19 14:52:50.515 INFO [stderr]    |         ----^
Dec 19 14:52:50.515 INFO [stderr]    |         |
Dec 19 14:52:50.515 INFO [stderr]    |         help: remove this `mut`
Dec 19 14:52:50.515 INFO [stderr]    |
Dec 19 14:52:50.515 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 14:52:50.515 INFO [stderr] 
Dec 19 14:52:50.544 INFO [stderr] warning: unnecessary parentheses around assigned value
Dec 19 14:52:50.544 INFO [stderr]   --> src/test/primitive_types.rs:47:13
Dec 19 14:52:50.544 INFO [stderr]    |
Dec 19 14:52:50.544 INFO [stderr] 47 |     let b = (0);  // Normal zero
Dec 19 14:52:50.544 INFO [stderr]    |             ^^^ help: remove these parentheses
Dec 19 14:52:50.544 INFO [stderr]    |
Dec 19 14:52:50.544 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Dec 19 14:52:50.544 INFO [stderr] 
Dec 19 14:52:50.570 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.570 INFO [stderr]  --> src/test/primitive_types.rs:3:9
Dec 19 14:52:50.570 INFO [stderr]   |
Dec 19 14:52:50.570 INFO [stderr] 3 |     let x = true;
Dec 19 14:52:50.570 INFO [stderr]   |         ^ help: consider using `_x` instead
Dec 19 14:52:50.570 INFO [stderr]   |
Dec 19 14:52:50.570 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 14:52:50.570 INFO [stderr] 
Dec 19 14:52:50.570 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.570 INFO [stderr]  --> src/test/primitive_types.rs:4:9
Dec 19 14:52:50.570 INFO [stderr]   |
Dec 19 14:52:50.570 INFO [stderr] 4 |     let y: bool = false;
Dec 19 14:52:50.570 INFO [stderr]   |         ^ help: consider using `_y` instead
Dec 19 14:52:50.570 INFO [stderr] 
Dec 19 14:52:50.570 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.570 INFO [stderr]  --> src/test/primitive_types.rs:7:9
Dec 19 14:52:50.570 INFO [stderr]   |
Dec 19 14:52:50.570 INFO [stderr] 7 |     let x = 'x';
Dec 19 14:52:50.570 INFO [stderr]   |         ^ help: consider using `_x` instead
Dec 19 14:52:50.570 INFO [stderr] 
Dec 19 14:52:50.570 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.570 INFO [stderr]   --> src/test/primitive_types.rs:10:9
Dec 19 14:52:50.570 INFO [stderr]    |
Dec 19 14:52:50.570 INFO [stderr] 10 |     let x = 42; // `x` has type `i32`
Dec 19 14:52:50.570 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.570 INFO [stderr] 
Dec 19 14:52:50.570 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.570 INFO [stderr]   --> src/test/primitive_types.rs:11:9
Dec 19 14:52:50.570 INFO [stderr]    |
Dec 19 14:52:50.570 INFO [stderr] 11 |     let y = 1.0; // `y` has type `f64`
Dec 19 14:52:50.570 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.570 INFO [stderr] 
Dec 19 14:52:50.570 INFO [stderr] warning: unused variable: `a`
Dec 19 14:52:50.570 INFO [stderr]   --> src/test/primitive_types.rs:19:9
Dec 19 14:52:50.570 INFO [stderr]    |
Dec 19 14:52:50.570 INFO [stderr] 19 |     let a = [1, 2, 3]; // a : [i32; 3]
Dec 19 14:52:50.570 INFO [stderr]    |         ^ help: consider using `_a` instead
Dec 19 14:52:50.570 INFO [stderr] 
Dec 19 14:52:50.570 INFO [stderr] warning: unused variable: `m`
Dec 19 14:52:50.570 INFO [stderr]   --> src/test/primitive_types.rs:20:13
Dec 19 14:52:50.570 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 20 |     let mut m = [1, 2, 3]; // m : [i32; 3]
Dec 19 14:52:50.571 INFO [stderr]    |             ^ help: consider using `_m` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `names`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:25:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 25 |     let names = ["Juspreet", "Cook", "Levin"]; // names : [&str; 3]
Dec 19 14:52:50.571 INFO [stderr]    |         ^^^^^ help: consider using `_names` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `b_duplicate`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:30:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 30 |     let b_duplicate = &b[..];  // A slice containing everything in `a`
Dec 19 14:52:50.571 INFO [stderr]    |         ^^^^^^^^^^^ help: consider using `_b_duplicate` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `middle`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:31:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 31 |     let middle = &b[1..4];     // A slice of `a` : [1, 2, 3]
Dec 19 14:52:50.571 INFO [stderr]    |         ^^^^^^ help: consider using `_middle` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:35:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 35 |     let x = (1, "hello");
Dec 19 14:52:50.571 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:36:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 36 |     let y: (i32, &str) = (1, "hello");
Dec 19 14:52:50.571 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: variable `x` is assigned to, but never used
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:38:13
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 38 |     let mut x = (1, 2);
Dec 19 14:52:50.571 INFO [stderr]    |             ^
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr]    = note: consider using `_x` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: value assigned to `x` is never read
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:40:5
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 40 |     x = y;   // A tuple is assigned to another (mutable) tuple, and type-check => The same Product-Type
Dec 19 14:52:50.571 INFO [stderr]    |     ^
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 14:52:50.571 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `a`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:46:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 46 |     let a = (0,); // Tuple of arity 1
Dec 19 14:52:50.571 INFO [stderr]    |         ^ help: consider using `_a` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `b`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:47:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 47 |     let b = (0);  // Normal zero
Dec 19 14:52:50.571 INFO [stderr]    |         ^ help: consider using `_b` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:52:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 52 |     let x = tuple.0;
Dec 19 14:52:50.571 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:53:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 53 |     let y = tuple.1;
Dec 19 14:52:50.571 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: unused variable: `z`
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:54:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 54 |     let z = tuple.2;
Dec 19 14:52:50.571 INFO [stderr]    |         ^ help: consider using `_z` instead
Dec 19 14:52:50.571 INFO [stderr] 
Dec 19 14:52:50.571 INFO [stderr] warning: variable does not need to be mutable
Dec 19 14:52:50.571 INFO [stderr]   --> src/test/primitive_types.rs:20:9
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.571 INFO [stderr] 20 |     let mut m = [1, 2, 3]; // m : [i32; 3]
Dec 19 14:52:50.571 INFO [stderr]    |         ----^
Dec 19 14:52:50.571 INFO [stderr]    |         |
Dec 19 14:52:50.571 INFO [stderr]    |         help: remove this `mut`
Dec 19 14:52:50.571 INFO [stderr]    |
Dec 19 14:52:50.572 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 14:52:50.572 INFO [stderr] 
Dec 19 14:52:50.572 INFO [stderr] warning: function is never used: `foo`
Dec 19 14:52:50.572 INFO [stderr]   --> src/test/primitive_types.rs:57:5
Dec 19 14:52:50.572 INFO [stderr]    |
Dec 19 14:52:50.572 INFO [stderr] 57 |     fn foo(x: i32) -> i32 { x } // foo : i32 -> i32
Dec 19 14:52:50.572 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 19 14:52:50.572 INFO [stderr]    |
Dec 19 14:52:50.572 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 19 14:52:50.572 INFO [stderr] 
Dec 19 14:52:50.572 INFO [stderr] warning: function is never used: `two_foo`
Dec 19 14:52:50.572 INFO [stderr]   --> src/test/primitive_types.rs:59:5
Dec 19 14:52:50.572 INFO [stderr]    |
Dec 19 14:52:50.572 INFO [stderr] 59 |     fn two_foo(x: i32, y: i32) -> i32 { x + y } // two_foo : (i32 * i32) -> i32
Dec 19 14:52:50.572 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 14:52:50.572 INFO [stderr] 
Dec 19 14:52:50.650 INFO [stderr] warning: unnecessary parentheses around assigned value
Dec 19 14:52:50.650 INFO [stderr]   --> src/test/functions.rs:20:13
Dec 19 14:52:50.650 INFO [stderr]    |
Dec 19 14:52:50.650 INFO [stderr] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
Dec 19 14:52:50.650 INFO [stderr]    |             ^^^^^^^ help: remove these parentheses
Dec 19 14:52:50.650 INFO [stderr]    |
Dec 19 14:52:50.650 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Dec 19 14:52:50.650 INFO [stderr] 
Dec 19 14:52:50.672 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.672 INFO [stderr]  --> src/test/vectors.rs:9:9
Dec 19 14:52:50.672 INFO [stderr]   |
Dec 19 14:52:50.672 INFO [stderr] 9 |     let x = Box::new(5);   // This is closer to the Type-Theoretic defn of `List<T>` := Nil | Cons(T, Box(List<T>))
Dec 19 14:52:50.672 INFO [stderr]   |         ^ help: consider using `_x` instead
Dec 19 14:52:50.672 INFO [stderr]   |
Dec 19 14:52:50.672 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 14:52:50.672 INFO [stderr] 
Dec 19 14:52:50.720 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.720 INFO [stderr]   --> src/test/conditionals_and_loops.rs:14:9
Dec 19 14:52:50.720 INFO [stderr]    |
Dec 19 14:52:50.720 INFO [stderr] 14 |     let y = if x == 5 { 10 } else { 15 }; // y : i32
Dec 19 14:52:50.720 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.720 INFO [stderr]    |
Dec 19 14:52:50.720 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 14:52:50.720 INFO [stderr] 
Dec 19 14:52:50.728 INFO [stderr] warning: unreachable statement
Dec 19 14:52:50.728 INFO [stderr]   --> src/test/functions.rs:23:5
Dec 19 14:52:50.728 INFO [stderr]    |
Dec 19 14:52:50.728 INFO [stderr] 23 |     let x: String = diverges();
Dec 19 14:52:50.728 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 14:52:50.740 INFO [stderr]    |
Dec 19 14:52:50.740 INFO [stderr]    = note: #[warn(unreachable_code)] on by default
Dec 19 14:52:50.740 INFO [stderr] 
Dec 19 14:52:50.753 INFO [stderr] warning: variable `y` is assigned to, but never used
Dec 19 14:52:50.753 INFO [stderr]   --> src/test/functions.rs:19:13
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr] 19 |     let mut y = 5;
Dec 19 14:52:50.753 INFO [stderr]    |             ^
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 14:52:50.753 INFO [stderr]    = note: consider using `_y` instead
Dec 19 14:52:50.753 INFO [stderr] 
Dec 19 14:52:50.753 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.753 INFO [stderr]   --> src/test/functions.rs:20:9
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
Dec 19 14:52:50.753 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.753 INFO [stderr] 
Dec 19 14:52:50.753 INFO [stderr] warning: value assigned to `y` is never read
Dec 19 14:52:50.753 INFO [stderr]   --> src/test/functions.rs:20:14
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr] 20 |     let x = (y = 6); // `x` has the value `()`, _NOT_ 6
Dec 19 14:52:50.753 INFO [stderr]    |              ^
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 14:52:50.753 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 14:52:50.753 INFO [stderr] 
Dec 19 14:52:50.753 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.753 INFO [stderr]   --> src/test/functions.rs:22:9
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr] 22 |     let x: i32 = diverges();
Dec 19 14:52:50.753 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.753 INFO [stderr] 
Dec 19 14:52:50.753 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.753 INFO [stderr]   --> src/test/functions.rs:23:9
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr] 23 |     let x: String = diverges();
Dec 19 14:52:50.753 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 19 14:52:50.753 INFO [stderr] 
Dec 19 14:52:50.753 INFO [stderr] warning: unused variable: `f`
Dec 19 14:52:50.753 INFO [stderr]   --> src/test/functions.rs:28:9
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr] 28 |     let f: fn(i32) -> i32;
Dec 19 14:52:50.753 INFO [stderr]    |         ^ help: consider using `_f` instead
Dec 19 14:52:50.753 INFO [stderr] 
Dec 19 14:52:50.753 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.753 INFO [stderr]   --> src/test/functions.rs:31:9
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr] 31 |     let y = f(5, 6);
Dec 19 14:52:50.753 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:50.753 INFO [stderr] 
Dec 19 14:52:50.753 INFO [stderr] warning: unused variable: `z`
Dec 19 14:52:50.753 INFO [stderr]   --> src/test/functions.rs:34:9
Dec 19 14:52:50.753 INFO [stderr]    |
Dec 19 14:52:50.753 INFO [stderr] 34 |     let z = sum_number(5, 6);
Dec 19 14:52:50.753 INFO [stderr]    |         ^ help: consider using `_z` instead
Dec 19 14:52:50.753 INFO [stderr] 
Dec 19 14:52:50.760 INFO [stderr] warning: function is never used: `sum_number_three`
Dec 19 14:52:50.760 INFO [stderr]  --> src/test/functions.rs:9:1
Dec 19 14:52:50.760 INFO [stderr]   |
Dec 19 14:52:50.760 INFO [stderr] 9 | fn sum_number_three(x: i32, y: i32, z:i32) -> i32 {
Dec 19 14:52:50.760 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 14:52:50.761 INFO [stderr]   |
Dec 19 14:52:50.761 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 19 14:52:50.761 INFO [stderr] 
Dec 19 14:52:50.848 INFO [stderr] warning: unused variable: `x`
Dec 19 14:52:50.848 INFO [stderr]  --> src/test/vectors.rs:9:9
Dec 19 14:52:50.848 INFO [stderr]   |
Dec 19 14:52:50.848 INFO [stderr] 9 |     let x = Box::new(5);   // This is closer to the Type-Theoretic defn of `List<T>` := Nil | Cons(T, Box(List<T>))
Dec 19 14:52:50.848 INFO [stderr]   |         ^ help: consider using `_x` instead
Dec 19 14:52:50.848 INFO [stderr]   |
Dec 19 14:52:50.848 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 14:52:50.848 INFO [stderr] 
Dec 19 14:52:50.921 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:50.921 INFO [stderr]  --> src/test/data_types.rs:3:9
Dec 19 14:52:50.921 INFO [stderr]   |
Dec 19 14:52:50.921 INFO [stderr] 3 |    let (y, z) = (1, 2); // Binding that uses _patterns_
Dec 19 14:52:50.921 INFO [stderr]   |         ^ help: consider using `_y` instead
Dec 19 14:52:50.921 INFO [stderr]   |
Dec 19 14:52:50.921 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 14:52:50.921 INFO [stderr] 
Dec 19 14:52:50.921 INFO [stderr] warning: unused variable: `z`
Dec 19 14:52:50.921 INFO [stderr]  --> src/test/data_types.rs:3:12
Dec 19 14:52:50.921 INFO [stderr]   |
Dec 19 14:52:50.921 INFO [stderr] 3 |    let (y, z) = (1, 2); // Binding that uses _patterns_
Dec 19 14:52:50.921 INFO [stderr]   |            ^ help: consider using `_z` instead
Dec 19 14:52:50.921 INFO [stderr] 
Dec 19 14:52:50.921 INFO [stderr] warning: unused variable: `k`
Dec 19 14:52:50.921 INFO [stderr]  --> src/test/data_types.rs:4:8
Dec 19 14:52:50.921 INFO [stderr]   |
Dec 19 14:52:50.921 INFO [stderr] 4 |    let k: i32 = 5; // Binding to _bind_ k to 5, with a static "int 32" type
Dec 19 14:52:50.921 INFO [stderr]   |        ^ help: consider using `_k` instead
Dec 19 14:52:50.921 INFO [stderr] 
Dec 19 14:52:50.921 INFO [stderr] warning: value assigned to `xp` is never read
Dec 19 14:52:50.921 INFO [stderr]   --> src/test/data_types.rs:11:12
Dec 19 14:52:50.921 INFO [stderr]    |
Dec 19 14:52:50.921 INFO [stderr] 11 |    let mut xp = 5;
Dec 19 14:52:50.921 INFO [stderr]    |            ^^
Dec 19 14:52:50.921 INFO [stderr]    |
Dec 19 14:52:50.921 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 14:52:50.921 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 14:52:50.921 INFO [stderr] 
Dec 19 14:52:50.921 INFO [stderr] warning: value assigned to `a` is never read
Dec 19 14:52:50.921 INFO [stderr]   --> src/test/data_types.rs:32:12
Dec 19 14:52:50.921 INFO [stderr]    |
Dec 19 14:52:50.921 INFO [stderr] 32 |    let mut a: i32 = 8;
Dec 19 14:52:50.921 INFO [stderr]    |            ^
Dec 19 14:52:50.921 INFO [stderr]    |
Dec 19 14:52:50.921 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 14:52:50.921 INFO [stderr] 
Dec 19 14:52:50.921 INFO [stderr] warning: unused variable: `a`
Dec 19 14:52:50.921 INFO [stderr]   --> src/test/data_types.rs:34:8
Dec 19 14:52:50.921 INFO [stderr]    |
Dec 19 14:52:50.921 INFO [stderr] 34 |    let a = a; // a is now _immutable_ and *locked* to 10 (util shadowed). 
Dec 19 14:52:50.921 INFO [stderr]    |        ^ help: consider using `_a` instead
Dec 19 14:52:50.921 INFO [stderr] 
Dec 19 14:52:50.921 INFO [stderr] warning: unused variable: `e`
Dec 19 14:52:50.921 INFO [stderr]   --> src/test/data_types.rs:37:8
Dec 19 14:52:50.921 INFO [stderr]    |
Dec 19 14:52:50.921 INFO [stderr] 37 |    let e = 5;
Dec 19 14:52:50.921 INFO [stderr]    |        ^ help: consider using `_e` instead
Dec 19 14:52:50.921 INFO [stderr] 
Dec 19 14:52:50.921 INFO [stderr] warning: unused variable: `e`
Dec 19 14:52:50.921 INFO [stderr]   --> src/test/data_types.rs:38:8
Dec 19 14:52:50.921 INFO [stderr]    |
Dec 19 14:52:50.921 INFO [stderr] 38 |    let e = "I am now a string!"; // e has changed types from i32 --> string
Dec 19 14:52:50.921 INFO [stderr]    |        ^ help: consider using `_e` instead
Dec 19 14:52:50.921 INFO [stderr] 
Dec 19 14:52:51.012 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:51.012 INFO [stderr]  --> src/test/data_types.rs:3:9
Dec 19 14:52:51.012 INFO [stderr]   |
Dec 19 14:52:51.012 INFO [stderr] 3 |    let (y, z) = (1, 2); // Binding that uses _patterns_
Dec 19 14:52:51.012 INFO [stderr]   |         ^ help: consider using `_y` instead
Dec 19 14:52:51.012 INFO [stderr]   |
Dec 19 14:52:51.012 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 14:52:51.012 INFO [stderr] 
Dec 19 14:52:51.012 INFO [stderr] warning: unused variable: `z`
Dec 19 14:52:51.012 INFO [stderr]  --> src/test/data_types.rs:3:12
Dec 19 14:52:51.012 INFO [stderr]   |
Dec 19 14:52:51.012 INFO [stderr] 3 |    let (y, z) = (1, 2); // Binding that uses _patterns_
Dec 19 14:52:51.012 INFO [stderr]   |            ^ help: consider using `_z` instead
Dec 19 14:52:51.012 INFO [stderr] 
Dec 19 14:52:51.012 INFO [stderr] warning: unused variable: `k`
Dec 19 14:52:51.012 INFO [stderr]  --> src/test/data_types.rs:4:8
Dec 19 14:52:51.012 INFO [stderr]   |
Dec 19 14:52:51.012 INFO [stderr] 4 |    let k: i32 = 5; // Binding to _bind_ k to 5, with a static "int 32" type
Dec 19 14:52:51.012 INFO [stderr]   |        ^ help: consider using `_k` instead
Dec 19 14:52:51.012 INFO [stderr] 
Dec 19 14:52:51.012 INFO [stderr] warning: value assigned to `xp` is never read
Dec 19 14:52:51.012 INFO [stderr]   --> src/test/data_types.rs:11:12
Dec 19 14:52:51.012 INFO [stderr]    |
Dec 19 14:52:51.012 INFO [stderr] 11 |    let mut xp = 5;
Dec 19 14:52:51.012 INFO [stderr]    |            ^^
Dec 19 14:52:51.012 INFO [stderr]    |
Dec 19 14:52:51.012 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 14:52:51.012 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 14:52:51.012 INFO [stderr] 
Dec 19 14:52:51.012 INFO [stderr] warning: value assigned to `a` is never read
Dec 19 14:52:51.012 INFO [stderr]   --> src/test/data_types.rs:32:12
Dec 19 14:52:51.012 INFO [stderr]    |
Dec 19 14:52:51.012 INFO [stderr] 32 |    let mut a: i32 = 8;
Dec 19 14:52:51.012 INFO [stderr]    |            ^
Dec 19 14:52:51.012 INFO [stderr]    |
Dec 19 14:52:51.012 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 14:52:51.012 INFO [stderr] 
Dec 19 14:52:51.012 INFO [stderr] warning: unused variable: `a`
Dec 19 14:52:51.012 INFO [stderr]   --> src/test/data_types.rs:34:8
Dec 19 14:52:51.012 INFO [stderr]    |
Dec 19 14:52:51.012 INFO [stderr] 34 |    let a = a; // a is now _immutable_ and *locked* to 10 (util shadowed). 
Dec 19 14:52:51.012 INFO [stderr]    |        ^ help: consider using `_a` instead
Dec 19 14:52:51.012 INFO [stderr] 
Dec 19 14:52:51.012 INFO [stderr] warning: unused variable: `e`
Dec 19 14:52:51.013 INFO [stderr]   --> src/test/data_types.rs:37:8
Dec 19 14:52:51.013 INFO [stderr]    |
Dec 19 14:52:51.013 INFO [stderr] 37 |    let e = 5;
Dec 19 14:52:51.013 INFO [stderr]    |        ^ help: consider using `_e` instead
Dec 19 14:52:51.013 INFO [stderr] 
Dec 19 14:52:51.013 INFO [stderr] warning: unused variable: `e`
Dec 19 14:52:51.013 INFO [stderr]   --> src/test/data_types.rs:38:8
Dec 19 14:52:51.013 INFO [stderr]    |
Dec 19 14:52:51.013 INFO [stderr] 38 |    let e = "I am now a string!"; // e has changed types from i32 --> string
Dec 19 14:52:51.013 INFO [stderr]    |        ^ help: consider using `_e` instead
Dec 19 14:52:51.013 INFO [stderr] 
Dec 19 14:52:51.024 INFO [stderr] warning: unused variable: `y`
Dec 19 14:52:51.024 INFO [stderr]   --> src/test/conditionals_and_loops.rs:14:9
Dec 19 14:52:51.024 INFO [stderr]    |
Dec 19 14:52:51.024 INFO [stderr] 14 |     let y = if x == 5 { 10 } else { 15 }; // y : i32
Dec 19 14:52:51.024 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 19 14:52:51.024 INFO [stderr]    |
Dec 19 14:52:51.024 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 14:52:51.024 INFO [stderr] 
Dec 19 14:52:51.040 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
Dec 19 14:52:51.382 INFO running `"docker" "inspect" "3ed91d197b24c2a6304515bfe9163583b4fd28bcf4b54173c40c41a86c6972b2"`
Dec 19 14:52:51.588 INFO running `"docker" "rm" "-f" "3ed91d197b24c2a6304515bfe9163583b4fd28bcf4b54173c40c41a86c6972b2"`
Dec 19 14:52:51.696 INFO [stdout] 3ed91d197b24c2a6304515bfe9163583b4fd28bcf4b54173c40c41a86c6972b2