Dec 18 10:32:13.849 INFO checking tao-of-rust-0.1.0 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 10:32:13.849 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/tao-of-rust/0.1.0:/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 10:32:14.239 INFO [stdout] 7900812560e351e195b746d5ee1264dc12b015158e67960499a7948b1788c758
Dec 18 10:32:14.248 INFO running `"docker" "start" "-a" "7900812560e351e195b746d5ee1264dc12b015158e67960499a7948b1788c758"`
Dec 18 10:32:15.784 INFO [stderr]     Checking csv_challenge v0.1.0
Dec 18 10:32:15.784 INFO [stderr]     Checking failures_crate v0.1.0
Dec 18 10:32:16.881 INFO [stderr]     Checking tao-of-rust v0.1.0 (/opt/crater/workdir)
Dec 18 10:32:18.322 INFO [stderr] warning: unnecessary parentheses around `for` head expression
Dec 18 10:32:18.322 INFO [stderr]    --> src/ch2/primitives.rs:170:14
Dec 18 10:32:18.322 INFO [stderr]     |
Dec 18 10:32:18.322 INFO [stderr] 170 |     for i in (1..5) {
Dec 18 10:32:18.322 INFO [stderr]     |              ^^^^^^ help: remove these parentheses
Dec 18 10:32:18.322 INFO [stderr]     |
Dec 18 10:32:18.322 INFO [stderr]     = note: #[warn(unused_parens)] on by default
Dec 18 10:32:18.322 INFO [stderr] 
Dec 18 10:32:18.322 INFO [stderr] warning: unnecessary parentheses around `for` head expression
Dec 18 10:32:18.322 INFO [stderr]    --> src/ch2/primitives.rs:173:14
Dec 18 10:32:18.322 INFO [stderr]     |
Dec 18 10:32:18.322 INFO [stderr] 173 |     for i in (1..=5) {
Dec 18 10:32:18.322 INFO [stderr]     |              ^^^^^^^ help: remove these parentheses
Dec 18 10:32:18.322 INFO [stderr] 
Dec 18 10:32:18.322 INFO [stderr] warning: unnecessary parentheses around `if` condition
Dec 18 10:32:18.322 INFO [stderr]   --> src/ch2/structs.rs:58:23
Dec 18 10:32:18.322 INFO [stderr]    |
Dec 18 10:32:18.322 INFO [stderr] 58 |       let gender = if (self.gender == 1) {"boy"} else {"girl"};
Dec 18 10:32:18.322 INFO [stderr]    |                       ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
Dec 18 10:32:18.322 INFO [stderr] 
Dec 18 10:32:18.840 INFO [stderr] warning: unnecessary parentheses around `for` head expression
Dec 18 10:32:18.840 INFO [stderr]    --> src/ch2/primitives.rs:170:14
Dec 18 10:32:18.840 INFO [stderr]     |
Dec 18 10:32:18.840 INFO [stderr] 170 |     for i in (1..5) {
Dec 18 10:32:18.840 INFO [stderr]     |              ^^^^^^ help: remove these parentheses
Dec 18 10:32:18.840 INFO [stderr]     |
Dec 18 10:32:18.840 INFO [stderr]     = note: #[warn(unused_parens)] on by default
Dec 18 10:32:18.840 INFO [stderr] 
Dec 18 10:32:18.840 INFO [stderr] warning: unnecessary parentheses around `for` head expression
Dec 18 10:32:18.840 INFO [stderr]    --> src/ch2/primitives.rs:173:14
Dec 18 10:32:18.840 INFO [stderr]     |
Dec 18 10:32:18.841 INFO [stderr] 173 |     for i in (1..=5) {
Dec 18 10:32:18.841 INFO [stderr]     |              ^^^^^^^ help: remove these parentheses
Dec 18 10:32:18.841 INFO [stderr] 
Dec 18 10:32:18.841 INFO [stderr] warning: unnecessary parentheses around `if` condition
Dec 18 10:32:18.841 INFO [stderr]   --> src/ch2/structs.rs:58:23
Dec 18 10:32:18.841 INFO [stderr]    |
Dec 18 10:32:18.841 INFO [stderr] 58 |       let gender = if (self.gender == 1) {"boy"} else {"girl"};
Dec 18 10:32:18.841 INFO [stderr]    |                       ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
Dec 18 10:32:18.841 INFO [stderr] 
Dec 18 10:32:19.455 INFO [stderr] warning: unused variable: `a`
Dec 18 10:32:19.455 INFO [stderr]   --> src/ch2/binding.rs:31:9
Dec 18 10:32:19.455 INFO [stderr]    |
Dec 18 10:32:19.455 INFO [stderr] 31 |     let a = 1;
Dec 18 10:32:19.455 INFO [stderr]    |         ^ help: consider using `_a` instead
Dec 18 10:32:19.455 INFO [stderr]    |
Dec 18 10:32:19.455 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 10:32:19.455 INFO [stderr] 
Dec 18 10:32:19.455 INFO [stderr] warning: variable `b` is assigned to, but never used
Dec 18 10:32:19.455 INFO [stderr]   --> src/ch2/binding.rs:33:13
Dec 18 10:32:19.455 INFO [stderr]    |
Dec 18 10:32:19.455 INFO [stderr] 33 |     let mut b = 2;
Dec 18 10:32:19.455 INFO [stderr]    |             ^
Dec 18 10:32:19.455 INFO [stderr]    |
Dec 18 10:32:19.455 INFO [stderr]    = note: consider using `_b` instead
Dec 18 10:32:19.455 INFO [stderr] 
Dec 18 10:32:19.457 INFO [stderr] warning: value assigned to `b` is never read
Dec 18 10:32:19.457 INFO [stderr]   --> src/ch2/binding.rs:34:5
Dec 18 10:32:19.457 INFO [stderr]    |
Dec 18 10:32:19.457 INFO [stderr] 34 |     b = 3; // mutable
Dec 18 10:32:19.458 INFO [stderr]    |     ^
Dec 18 10:32:19.458 INFO [stderr]    |
Dec 18 10:32:19.458 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 18 10:32:19.458 INFO [stderr] 
Dec 18 10:32:19.459 INFO [stderr] warning: unused variable: `v2`
Dec 18 10:32:19.459 INFO [stderr]   --> src/ch2/collections.rs:31:13
Dec 18 10:32:19.459 INFO [stderr]    |
Dec 18 10:32:19.459 INFO [stderr] 31 |     let mut v2 = vec![0; 10];
Dec 18 10:32:19.459 INFO [stderr]    |             ^^ help: consider using `_v2` instead
Dec 18 10:32:19.459 INFO [stderr] 
Dec 18 10:32:19.459 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.459 INFO [stderr]   --> src/ch2/primitives.rs:17:9
Dec 18 10:32:19.459 INFO [stderr]    |
Dec 18 10:32:19.459 INFO [stderr] 17 |     let x = true;
Dec 18 10:32:19.459 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 18 10:32:19.459 INFO [stderr] 
Dec 18 10:32:19.459 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.459 INFO [stderr]   --> src/ch2/primitives.rs:52:9
Dec 18 10:32:19.459 INFO [stderr]    |
Dec 18 10:32:19.459 INFO [stderr] 52 |     let num = 42u32;
Dec 18 10:32:19.459 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.459 INFO [stderr] 
Dec 18 10:32:19.459 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.459 INFO [stderr]   --> src/ch2/primitives.rs:53:9
Dec 18 10:32:19.459 INFO [stderr]    |
Dec 18 10:32:19.459 INFO [stderr] 53 |     let num: u32 = 42;
Dec 18 10:32:19.459 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.459 INFO [stderr] 
Dec 18 10:32:19.460 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.460 INFO [stderr]   --> src/ch2/primitives.rs:54:9
Dec 18 10:32:19.460 INFO [stderr]    |
Dec 18 10:32:19.460 INFO [stderr] 54 |     let num = 0x2A;  // 16进制
Dec 18 10:32:19.460 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.460 INFO [stderr] 
Dec 18 10:32:19.460 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.460 INFO [stderr]   --> src/ch2/primitives.rs:55:9
Dec 18 10:32:19.460 INFO [stderr]    |
Dec 18 10:32:19.460 INFO [stderr] 55 |     let num = 0o106;  // 8进制
Dec 18 10:32:19.460 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.460 INFO [stderr] 
Dec 18 10:32:19.460 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.460 INFO [stderr]   --> src/ch2/primitives.rs:56:9
Dec 18 10:32:19.460 INFO [stderr]    |
Dec 18 10:32:19.460 INFO [stderr] 56 |     let num = 0b1101_1011; // 2进制
Dec 18 10:32:19.460 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.460 INFO [stderr] 
Dec 18 10:32:19.468 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.468 INFO [stderr]   --> src/ch2/primitives.rs:59:9
Dec 18 10:32:19.468 INFO [stderr]    |
Dec 18 10:32:19.468 INFO [stderr] 59 |     let num = 3.1415926f64;
Dec 18 10:32:19.468 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.468 INFO [stderr] 
Dec 18 10:32:19.468 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.468 INFO [stderr]   --> src/ch2/primitives.rs:94:9
Dec 18 10:32:19.468 INFO [stderr]    |
Dec 18 10:32:19.468 INFO [stderr] 94 |     let x = 'r';
Dec 18 10:32:19.468 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 18 10:32:19.468 INFO [stderr] 
Dec 18 10:32:19.468 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.468 INFO [stderr]   --> src/ch2/primitives.rs:95:9
Dec 18 10:32:19.468 INFO [stderr]    |
Dec 18 10:32:19.468 INFO [stderr] 95 |     let x = 'Ú';
Dec 18 10:32:19.468 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 18 10:32:19.468 INFO [stderr] 
Dec 18 10:32:19.468 INFO [stderr] warning: unused variable: `arr`
Dec 18 10:32:19.468 INFO [stderr]    --> src/ch2/primitives.rs:128:9
Dec 18 10:32:19.468 INFO [stderr]     |
Dec 18 10:32:19.468 INFO [stderr] 128 |     let arr: [i32; 3] = [1, 2, 3];
Dec 18 10:32:19.468 INFO [stderr]     |         ^^^ help: consider using `_arr` instead
Dec 18 10:32:19.468 INFO [stderr] 
Dec 18 10:32:19.468 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.468 INFO [stderr]    --> src/ch2/primitives.rs:350:9
Dec 18 10:32:19.468 INFO [stderr]     |
Dec 18 10:32:19.468 INFO [stderr] 350 |     let x: ! = {
Dec 18 10:32:19.468 INFO [stderr]     |         ^ help: consider using `_x` instead
Dec 18 10:32:19.468 INFO [stderr] 
Dec 18 10:32:19.468 INFO [stderr] warning: unused variable: `i`
Dec 18 10:32:19.468 INFO [stderr]   --> src/ch3/tag_trait.rs:53:27
Dec 18 10:32:19.468 INFO [stderr]    |
Dec 18 10:32:19.468 INFO [stderr] 53 |     fn test_copy<T: Copy>(i: T) {
Dec 18 10:32:19.468 INFO [stderr]    |                           ^ help: consider using `_i` instead
Dec 18 10:32:19.468 INFO [stderr] 
Dec 18 10:32:19.468 INFO [stderr] warning: unused variable: `y`
Dec 18 10:32:19.468 INFO [stderr]   --> src/ch3/type_cast.rs:71:9
Dec 18 10:32:19.468 INFO [stderr]    |
Dec 18 10:32:19.468 INFO [stderr] 71 |     let y = x.clone();  // Rc<&str>
Dec 18 10:32:19.469 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 18 10:32:19.469 INFO [stderr] 
Dec 18 10:32:19.469 INFO [stderr] warning: unused variable: `z`
Dec 18 10:32:19.469 INFO [stderr]   --> src/ch3/type_cast.rs:72:9
Dec 18 10:32:19.469 INFO [stderr]    |
Dec 18 10:32:19.469 INFO [stderr] 72 |     let z = (*x).clone();   // &str
Dec 18 10:32:19.469 INFO [stderr]    |         ^ help: consider using `_z` instead
Dec 18 10:32:19.469 INFO [stderr] 
Dec 18 10:32:19.469 INFO [stderr] warning: unused variable: `y`
Dec 18 10:32:19.469 INFO [stderr]   --> src/ch4/general_concepts.rs:18:13
Dec 18 10:32:19.469 INFO [stderr]    |
Dec 18 10:32:19.469 INFO [stderr] 18 |         let y = x;
Dec 18 10:32:19.469 INFO [stderr]    |             ^ help: consider using `_y` instead
Dec 18 10:32:19.469 INFO [stderr] 
Dec 18 10:32:19.469 INFO [stderr] warning: unused variable: `z`
Dec 18 10:32:19.469 INFO [stderr]   --> src/ch4/general_concepts.rs:19:13
Dec 18 10:32:19.469 INFO [stderr]    |
Dec 18 10:32:19.469 INFO [stderr] 19 |         let z = 100;
Dec 18 10:32:19.469 INFO [stderr]    |             ^ help: consider using `_z` instead
Dec 18 10:32:19.469 INFO [stderr] 
Dec 18 10:32:19.469 INFO [stderr] warning: unused variable: `s`
Dec 18 10:32:19.469 INFO [stderr]   --> src/ch4/raii.rs:14:13
Dec 18 10:32:19.469 INFO [stderr]    |
Dec 18 10:32:19.469 INFO [stderr] 14 |         let s = String::from("hello");
Dec 18 10:32:19.469 INFO [stderr]    |             ^ help: consider using `_s` instead
Dec 18 10:32:19.469 INFO [stderr] 
Dec 18 10:32:19.469 INFO [stderr] warning: unused variable: `v`
Dec 18 10:32:19.469 INFO [stderr]   --> src/ch4/raii.rs:16:13
Dec 18 10:32:19.469 INFO [stderr]    |
Dec 18 10:32:19.469 INFO [stderr] 16 |         let v = vec![1,2,3];
Dec 18 10:32:19.469 INFO [stderr]    |             ^ help: consider using `_v` instead
Dec 18 10:32:19.469 INFO [stderr] 
Dec 18 10:32:19.470 INFO [stderr] warning: unused variable: `stolen`
Dec 18 10:32:19.470 INFO [stderr]   --> src/ch5/semantic.rs:30:13
Dec 18 10:32:19.470 INFO [stderr]    |
Dec 18 10:32:19.470 INFO [stderr] 30 |         let stolen = orig;
Dec 18 10:32:19.470 INFO [stderr]    |             ^^^^^^ help: consider using `_stolen` instead
Dec 18 10:32:19.470 INFO [stderr] 
Dec 18 10:32:19.470 INFO [stderr] warning: unused variable: `b`
Dec 18 10:32:19.470 INFO [stderr]    --> src/ch5/semantic.rs:113:13
Dec 18 10:32:19.470 INFO [stderr]     |
Dec 18 10:32:19.470 INFO [stderr] 113 |         let b = a;
Dec 18 10:32:19.470 INFO [stderr]     |             ^ help: consider using `_b` instead
Dec 18 10:32:19.470 INFO [stderr] 
Dec 18 10:32:19.470 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.470 INFO [stderr]   --> src/ch5/share_mutable.rs:22:13
Dec 18 10:32:19.470 INFO [stderr]    |
Dec 18 10:32:19.470 INFO [stderr] 22 |         let x = "hello".to_string();
Dec 18 10:32:19.470 INFO [stderr]    |             ^ help: consider using `_x` instead
Dec 18 10:32:19.470 INFO [stderr] 
Dec 18 10:32:19.470 INFO [stderr] warning: unused variable: `a`
Dec 18 10:32:19.470 INFO [stderr]    --> src/ch5/share_mutable.rs:133:13
Dec 18 10:32:19.470 INFO [stderr]     |
Dec 18 10:32:19.470 INFO [stderr] 133 |         let a = "hello";   // -------scope a-------+
Dec 18 10:32:19.471 INFO [stderr]     |             ^ help: consider using `_a` instead
Dec 18 10:32:19.471 INFO [stderr] 
Dec 18 10:32:19.471 INFO [stderr] warning: unused variable: `b`
Dec 18 10:32:19.471 INFO [stderr]    --> src/ch5/share_mutable.rs:134:13
Dec 18 10:32:19.471 INFO [stderr]     |
Dec 18 10:32:19.471 INFO [stderr] 134 |         let b = "rust";    // -----scope b------+  |
Dec 18 10:32:19.471 INFO [stderr]     |             ^ help: consider using `_b` instead
Dec 18 10:32:19.471 INFO [stderr] 
Dec 18 10:32:19.472 INFO [stderr] warning: unused variable: `d`
Dec 18 10:32:19.472 INFO [stderr]    --> src/ch5/share_mutable.rs:136:13
Dec 18 10:32:19.472 INFO [stderr]     |
Dec 18 10:32:19.472 INFO [stderr] 136 |         let d = c;         // - scope d ---  |  |  |
Dec 18 10:32:19.472 INFO [stderr]     |             ^ help: consider using `_d` instead
Dec 18 10:32:19.472 INFO [stderr] 
Dec 18 10:32:19.476 INFO [stderr] warning: unused variable: `p`
Dec 18 10:32:19.476 INFO [stderr]    --> src/ch3/traits.rs:246:28
Dec 18 10:32:19.476 INFO [stderr]     |
Dec 18 10:32:19.476 INFO [stderr] 246 |         fn set_page(&self, p: i32){
Dec 18 10:32:19.476 INFO [stderr]     |                            ^ help: consider using `_p` instead
Dec 18 10:32:19.476 INFO [stderr] 
Dec 18 10:32:19.476 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.476 INFO [stderr]    --> src/ch3/traits.rs:251:31
Dec 18 10:32:19.476 INFO [stderr]     |
Dec 18 10:32:19.476 INFO [stderr] 251 |         fn set_perpage(&self, num: i32){
Dec 18 10:32:19.476 INFO [stderr]     |                               ^^^ help: consider using `_num` instead
Dec 18 10:32:19.477 INFO [stderr] 
Dec 18 10:32:19.477 INFO [stderr] warning: unused variable: `args`
Dec 18 10:32:19.477 INFO [stderr]    --> src/ch6/closures.rs:130:47
Dec 18 10:32:19.477 INFO [stderr]     |
Dec 18 10:32:19.477 INFO [stderr] 130 |         extern "rust-call" fn call_once(self, args: ()) -> u32 {
Dec 18 10:32:19.477 INFO [stderr]     |                                               ^^^^ help: consider using `_args` instead
Dec 18 10:32:19.477 INFO [stderr] 
Dec 18 10:32:19.477 INFO [stderr] warning: unused variable: `args`
Dec 18 10:32:19.477 INFO [stderr]    --> src/ch6/closures.rs:136:51
Dec 18 10:32:19.477 INFO [stderr]     |
Dec 18 10:32:19.477 INFO [stderr] 136 |         extern "rust-call" fn call_mut(&mut self, args: ()) -> u32 {
Dec 18 10:32:19.477 INFO [stderr]     |                                                   ^^^^ help: consider using `_args` instead
Dec 18 10:32:19.477 INFO [stderr] 
Dec 18 10:32:19.480 INFO [stderr] warning: unused variable: `args`
Dec 18 10:32:19.480 INFO [stderr]    --> src/ch6/closures.rs:142:43
Dec 18 10:32:19.480 INFO [stderr]     |
Dec 18 10:32:19.480 INFO [stderr] 142 |         extern "rust-call" fn call(&self, args: ()) -> u32 {
Dec 18 10:32:19.480 INFO [stderr]     |                                           ^^^^ help: consider using `_args` instead
Dec 18 10:32:19.480 INFO [stderr] 
Dec 18 10:32:19.544 INFO [stderr] warning: variable does not need to be mutable
Dec 18 10:32:19.544 INFO [stderr]   --> src/ch2/collections.rs:31:9
Dec 18 10:32:19.544 INFO [stderr]    |
Dec 18 10:32:19.544 INFO [stderr] 31 |     let mut v2 = vec![0; 10];
Dec 18 10:32:19.544 INFO [stderr]    |         ----^^
Dec 18 10:32:19.544 INFO [stderr]    |         |
Dec 18 10:32:19.544 INFO [stderr]    |         help: remove this `mut`
Dec 18 10:32:19.544 INFO [stderr]    |
Dec 18 10:32:19.545 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 10:32:19.545 INFO [stderr] 
Dec 18 10:32:19.884 INFO [stderr] warning: unused variable: `a`
Dec 18 10:32:19.884 INFO [stderr]   --> src/ch2/binding.rs:31:9
Dec 18 10:32:19.884 INFO [stderr]    |
Dec 18 10:32:19.884 INFO [stderr] 31 |     let a = 1;
Dec 18 10:32:19.892 INFO [stderr]    |         ^ help: consider using `_a` instead
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 10:32:19.892 INFO [stderr] 
Dec 18 10:32:19.892 INFO [stderr] warning: variable `b` is assigned to, but never used
Dec 18 10:32:19.892 INFO [stderr]   --> src/ch2/binding.rs:33:13
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr] 33 |     let mut b = 2;
Dec 18 10:32:19.892 INFO [stderr]    |             ^
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr]    = note: consider using `_b` instead
Dec 18 10:32:19.892 INFO [stderr] 
Dec 18 10:32:19.892 INFO [stderr] warning: value assigned to `b` is never read
Dec 18 10:32:19.892 INFO [stderr]   --> src/ch2/binding.rs:34:5
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr] 34 |     b = 3; // mutable
Dec 18 10:32:19.892 INFO [stderr]    |     ^
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 18 10:32:19.892 INFO [stderr] 
Dec 18 10:32:19.892 INFO [stderr] warning: unused variable: `v2`
Dec 18 10:32:19.892 INFO [stderr]   --> src/ch2/collections.rs:31:13
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr] 31 |     let mut v2 = vec![0; 10];
Dec 18 10:32:19.892 INFO [stderr]    |             ^^ help: consider using `_v2` instead
Dec 18 10:32:19.892 INFO [stderr] 
Dec 18 10:32:19.892 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.892 INFO [stderr]   --> src/ch2/primitives.rs:17:9
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr] 17 |     let x = true;
Dec 18 10:32:19.892 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 18 10:32:19.892 INFO [stderr] 
Dec 18 10:32:19.892 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.892 INFO [stderr]   --> src/ch2/primitives.rs:52:9
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr] 52 |     let num = 42u32;
Dec 18 10:32:19.892 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.892 INFO [stderr] 
Dec 18 10:32:19.892 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.892 INFO [stderr]   --> src/ch2/primitives.rs:53:9
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr] 53 |     let num: u32 = 42;
Dec 18 10:32:19.892 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.892 INFO [stderr] 
Dec 18 10:32:19.892 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.892 INFO [stderr]   --> src/ch2/primitives.rs:54:9
Dec 18 10:32:19.892 INFO [stderr]    |
Dec 18 10:32:19.892 INFO [stderr] 54 |     let num = 0x2A;  // 16进制
Dec 18 10:32:19.892 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch2/primitives.rs:55:9
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 55 |     let num = 0o106;  // 8进制
Dec 18 10:32:19.893 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch2/primitives.rs:56:9
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 56 |     let num = 0b1101_1011; // 2进制
Dec 18 10:32:19.893 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch2/primitives.rs:59:9
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 59 |     let num = 3.1415926f64;
Dec 18 10:32:19.893 INFO [stderr]    |         ^^^ help: consider using `_num` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch2/primitives.rs:94:9
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 94 |     let x = 'r';
Dec 18 10:32:19.893 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch2/primitives.rs:95:9
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 95 |     let x = 'Ú';
Dec 18 10:32:19.893 INFO [stderr]    |         ^ help: consider using `_x` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `arr`
Dec 18 10:32:19.893 INFO [stderr]    --> src/ch2/primitives.rs:128:9
Dec 18 10:32:19.893 INFO [stderr]     |
Dec 18 10:32:19.893 INFO [stderr] 128 |     let arr: [i32; 3] = [1, 2, 3];
Dec 18 10:32:19.893 INFO [stderr]     |         ^^^ help: consider using `_arr` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.893 INFO [stderr]    --> src/ch2/primitives.rs:350:9
Dec 18 10:32:19.893 INFO [stderr]     |
Dec 18 10:32:19.893 INFO [stderr] 350 |     let x: ! = {
Dec 18 10:32:19.893 INFO [stderr]     |         ^ help: consider using `_x` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `i`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch3/tag_trait.rs:53:27
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 53 |     fn test_copy<T: Copy>(i: T) {
Dec 18 10:32:19.893 INFO [stderr]    |                           ^ help: consider using `_i` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `y`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch3/type_cast.rs:71:9
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 71 |     let y = x.clone();  // Rc<&str>
Dec 18 10:32:19.893 INFO [stderr]    |         ^ help: consider using `_y` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `z`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch3/type_cast.rs:72:9
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 72 |     let z = (*x).clone();   // &str
Dec 18 10:32:19.893 INFO [stderr]    |         ^ help: consider using `_z` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `y`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch4/general_concepts.rs:18:13
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 18 |         let y = x;
Dec 18 10:32:19.893 INFO [stderr]    |             ^ help: consider using `_y` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `z`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch4/general_concepts.rs:19:13
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 19 |         let z = 100;
Dec 18 10:32:19.893 INFO [stderr]    |             ^ help: consider using `_z` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `s`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch4/raii.rs:14:13
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 14 |         let s = String::from("hello");
Dec 18 10:32:19.893 INFO [stderr]    |             ^ help: consider using `_s` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `v`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch4/raii.rs:16:13
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 16 |         let v = vec![1,2,3];
Dec 18 10:32:19.893 INFO [stderr]    |             ^ help: consider using `_v` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `stolen`
Dec 18 10:32:19.893 INFO [stderr]   --> src/ch5/semantic.rs:30:13
Dec 18 10:32:19.893 INFO [stderr]    |
Dec 18 10:32:19.893 INFO [stderr] 30 |         let stolen = orig;
Dec 18 10:32:19.893 INFO [stderr]    |             ^^^^^^ help: consider using `_stolen` instead
Dec 18 10:32:19.893 INFO [stderr] 
Dec 18 10:32:19.893 INFO [stderr] warning: unused variable: `b`
Dec 18 10:32:19.893 INFO [stderr]    --> src/ch5/semantic.rs:113:13
Dec 18 10:32:19.894 INFO [stderr]     |
Dec 18 10:32:19.894 INFO [stderr] 113 |         let b = a;
Dec 18 10:32:19.894 INFO [stderr]     |             ^ help: consider using `_b` instead
Dec 18 10:32:19.894 INFO [stderr] 
Dec 18 10:32:19.894 INFO [stderr] warning: unused variable: `x`
Dec 18 10:32:19.894 INFO [stderr]   --> src/ch5/share_mutable.rs:22:13
Dec 18 10:32:19.894 INFO [stderr]    |
Dec 18 10:32:19.894 INFO [stderr] 22 |         let x = "hello".to_string();
Dec 18 10:32:19.894 INFO [stderr]    |             ^ help: consider using `_x` instead
Dec 18 10:32:19.894 INFO [stderr] 
Dec 18 10:32:19.894 INFO [stderr] warning: unused variable: `a`
Dec 18 10:32:19.894 INFO [stderr]    --> src/ch5/share_mutable.rs:133:13
Dec 18 10:32:19.894 INFO [stderr]     |
Dec 18 10:32:19.894 INFO [stderr] 133 |         let a = "hello";   // -------scope a-------+
Dec 18 10:32:19.894 INFO [stderr]     |             ^ help: consider using `_a` instead
Dec 18 10:32:19.894 INFO [stderr] 
Dec 18 10:32:19.894 INFO [stderr] warning: unused variable: `b`
Dec 18 10:32:19.894 INFO [stderr]    --> src/ch5/share_mutable.rs:134:13
Dec 18 10:32:19.894 INFO [stderr]     |
Dec 18 10:32:19.894 INFO [stderr] 134 |         let b = "rust";    // -----scope b------+  |
Dec 18 10:32:19.894 INFO [stderr]     |             ^ help: consider using `_b` instead
Dec 18 10:32:19.894 INFO [stderr] 
Dec 18 10:32:19.894 INFO [stderr] warning: unused variable: `d`
Dec 18 10:32:19.894 INFO [stderr]    --> src/ch5/share_mutable.rs:136:13
Dec 18 10:32:19.894 INFO [stderr]     |
Dec 18 10:32:19.894 INFO [stderr] 136 |         let d = c;         // - scope d ---  |  |  |
Dec 18 10:32:19.894 INFO [stderr]     |             ^ help: consider using `_d` instead
Dec 18 10:32:19.894 INFO [stderr] 
Dec 18 10:32:19.900 INFO [stderr] warning: unused variable: `p`
Dec 18 10:32:19.900 INFO [stderr]    --> src/ch3/traits.rs:246:28
Dec 18 10:32:19.900 INFO [stderr]     |
Dec 18 10:32:19.900 INFO [stderr] 246 |         fn set_page(&self, p: i32){
Dec 18 10:32:19.900 INFO [stderr]     |                            ^ help: consider using `_p` instead
Dec 18 10:32:19.900 INFO [stderr] 
Dec 18 10:32:19.900 INFO [stderr] warning: unused variable: `num`
Dec 18 10:32:19.900 INFO [stderr]    --> src/ch3/traits.rs:251:31
Dec 18 10:32:19.900 INFO [stderr]     |
Dec 18 10:32:19.900 INFO [stderr] 251 |         fn set_perpage(&self, num: i32){
Dec 18 10:32:19.900 INFO [stderr]     |                               ^^^ help: consider using `_num` instead
Dec 18 10:32:19.900 INFO [stderr] 
Dec 18 10:32:19.900 INFO [stderr] warning: unused variable: `args`
Dec 18 10:32:19.900 INFO [stderr]    --> src/ch6/closures.rs:130:47
Dec 18 10:32:19.900 INFO [stderr]     |
Dec 18 10:32:19.900 INFO [stderr] 130 |         extern "rust-call" fn call_once(self, args: ()) -> u32 {
Dec 18 10:32:19.900 INFO [stderr]     |                                               ^^^^ help: consider using `_args` instead
Dec 18 10:32:19.900 INFO [stderr] 
Dec 18 10:32:19.900 INFO [stderr] warning: unused variable: `args`
Dec 18 10:32:19.900 INFO [stderr]    --> src/ch6/closures.rs:136:51
Dec 18 10:32:19.900 INFO [stderr]     |
Dec 18 10:32:19.900 INFO [stderr] 136 |         extern "rust-call" fn call_mut(&mut self, args: ()) -> u32 {
Dec 18 10:32:19.900 INFO [stderr]     |                                                   ^^^^ help: consider using `_args` instead
Dec 18 10:32:19.900 INFO [stderr] 
Dec 18 10:32:19.900 INFO [stderr] warning: unused variable: `args`
Dec 18 10:32:19.900 INFO [stderr]    --> src/ch6/closures.rs:142:43
Dec 18 10:32:19.900 INFO [stderr]     |
Dec 18 10:32:19.900 INFO [stderr] 142 |         extern "rust-call" fn call(&self, args: ()) -> u32 {
Dec 18 10:32:19.900 INFO [stderr]     |                                           ^^^^ help: consider using `_args` instead
Dec 18 10:32:19.900 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: function is never used: `sum`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch2/function.rs:89:1
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 89 | fn sum(a: i32, b: i32) -> i32 {
Dec 18 10:32:19.963 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: function is never used: `product`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch2/function.rs:92:1
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 92 | fn product(a: i32, b: i32) -> i32 {
Dec 18 10:32:19.963 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: function is never used: `map_demo`
Dec 18 10:32:19.963 INFO [stderr]    --> src/ch2/collections.rs:169:1
Dec 18 10:32:19.963 INFO [stderr]     |
Dec 18 10:32:19.963 INFO [stderr] 169 | fn map_demo() {
Dec 18 10:32:19.963 INFO [stderr]     | ^^^^^^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: function is never used: `foo`
Dec 18 10:32:19.963 INFO [stderr]    --> src/ch2/primitives.rs:349:1
Dec 18 10:32:19.963 INFO [stderr]     |
Dec 18 10:32:19.963 INFO [stderr] 349 | fn foo() -> u32 {
Dec 18 10:32:19.963 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: method is never used: `new`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch2/structs.rs:48:5
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 48 |     fn new(name: &'static str, gender: u32) -> Self{
Dec 18 10:32:19.963 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: method is never used: `name`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch2/structs.rs:51:5
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 51 |     fn name(&self) {
Dec 18 10:32:19.963 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: method is never used: `set_name`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch2/structs.rs:54:5
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 54 |     fn set_name(&mut self, name: &'static str)  {
Dec 18 10:32:19.963 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: method is never used: `gender`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch2/structs.rs:57:5
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 57 |     fn gender(&self){
Dec 18 10:32:19.963 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: field is never used: `foo`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch3/zero_size.rs:27:9
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 27 |         foo: Foo,
Dec 18 10:32:19.963 INFO [stderr]    |         ^^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: field is never used: `qux`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch3/zero_size.rs:28:9
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 28 |         qux: (),
Dec 18 10:32:19.963 INFO [stderr]    |         ^^^^^^^
Dec 18 10:32:19.963 INFO [stderr] 
Dec 18 10:32:19.963 INFO [stderr] warning: field is never used: `baz`
Dec 18 10:32:19.963 INFO [stderr]   --> src/ch3/zero_size.rs:29:9
Dec 18 10:32:19.963 INFO [stderr]    |
Dec 18 10:32:19.963 INFO [stderr] 29 |         baz: [u8; 0],
Dec 18 10:32:19.964 INFO [stderr]    |         ^^^^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: field is never used: `page`
Dec 18 10:32:19.964 INFO [stderr]    --> src/ch3/traits.rs:262:24
Dec 18 10:32:19.964 INFO [stderr]     |
Dec 18 10:32:19.964 INFO [stderr] 262 |     struct MyPaginate{ page: i32 }
Dec 18 10:32:19.964 INFO [stderr]     |                        ^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: field is never used: `inner`
Dec 18 10:32:19.964 INFO [stderr]    --> src/ch3/trait_limit.rs:147:9
Dec 18 10:32:19.964 INFO [stderr]     |
Dec 18 10:32:19.964 INFO [stderr] 147 |         inner: T,
Dec 18 10:32:19.964 INFO [stderr]     |         ^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: function is never used: `foo`
Dec 18 10:32:19.964 INFO [stderr]   --> src/ch4/general_concepts.rs:17:5
Dec 18 10:32:19.964 INFO [stderr]    |
Dec 18 10:32:19.964 INFO [stderr] 17 |     fn foo(x: u32) {
Dec 18 10:32:19.964 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.964 INFO [stderr]   --> src/ch4/general_concepts.rs:21:5
Dec 18 10:32:19.964 INFO [stderr]    |
Dec 18 10:32:19.964 INFO [stderr] 21 |     fn main(){
Dec 18 10:32:19.964 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: struct is never constructed: `A`
Dec 18 10:32:19.964 INFO [stderr]   --> src/ch4/general_concepts.rs:56:5
Dec 18 10:32:19.964 INFO [stderr]    |
Dec 18 10:32:19.964 INFO [stderr] 56 |     struct A {
Dec 18 10:32:19.964 INFO [stderr]    |     ^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.964 INFO [stderr]   --> src/ch4/general_concepts.rs:61:5
Dec 18 10:32:19.964 INFO [stderr]    |
Dec 18 10:32:19.964 INFO [stderr] 61 |     fn main() {
Dec 18 10:32:19.964 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: struct is never constructed: `A`
Dec 18 10:32:19.964 INFO [stderr]   --> src/ch4/general_concepts.rs:96:5
Dec 18 10:32:19.964 INFO [stderr]    |
Dec 18 10:32:19.964 INFO [stderr] 96 |     struct A {
Dec 18 10:32:19.964 INFO [stderr]    |     ^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: struct is never constructed: `B`
Dec 18 10:32:19.964 INFO [stderr]    --> src/ch4/general_concepts.rs:100:5
Dec 18 10:32:19.964 INFO [stderr]     |
Dec 18 10:32:19.964 INFO [stderr] 100 |     struct B(i32, f64, char);
Dec 18 10:32:19.964 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: struct is never constructed: `N`
Dec 18 10:32:19.964 INFO [stderr]    --> src/ch4/general_concepts.rs:101:5
Dec 18 10:32:19.964 INFO [stderr]     |
Dec 18 10:32:19.964 INFO [stderr] 101 |     struct N;
Dec 18 10:32:19.964 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: enum is never used: `E`
Dec 18 10:32:19.964 INFO [stderr]    --> src/ch4/general_concepts.rs:102:5
Dec 18 10:32:19.964 INFO [stderr]     |
Dec 18 10:32:19.964 INFO [stderr] 102 |     enum E {
Dec 18 10:32:19.964 INFO [stderr]     |     ^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: union is never used: `U`
Dec 18 10:32:19.964 INFO [stderr]    --> src/ch4/general_concepts.rs:106:5
Dec 18 10:32:19.964 INFO [stderr]     |
Dec 18 10:32:19.964 INFO [stderr] 106 |     union U {
Dec 18 10:32:19.964 INFO [stderr]     |     ^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.964 INFO [stderr]    --> src/ch4/general_concepts.rs:110:5
Dec 18 10:32:19.964 INFO [stderr]     |
Dec 18 10:32:19.964 INFO [stderr] 110 |     fn main(){
Dec 18 10:32:19.964 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.964 INFO [stderr]   --> src/ch4/resource_management.rs:59:5
Dec 18 10:32:19.964 INFO [stderr]    |
Dec 18 10:32:19.964 INFO [stderr] 59 |     fn main() {
Dec 18 10:32:19.964 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.964 INFO [stderr]   --> src/ch4/raii.rs:13:5
Dec 18 10:32:19.964 INFO [stderr]    |
Dec 18 10:32:19.964 INFO [stderr] 13 |     fn main() {
Dec 18 10:32:19.964 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.964 INFO [stderr] 
Dec 18 10:32:19.964 INFO [stderr] warning: struct is never constructed: `S`
Dec 18 10:32:19.964 INFO [stderr]   --> src/ch4/raii.rs:94:5
Dec 18 10:32:19.964 INFO [stderr]    |
Dec 18 10:32:19.964 INFO [stderr] 94 |     struct S(i32);
Dec 18 10:32:19.965 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]    --> src/ch4/raii.rs:100:5
Dec 18 10:32:19.965 INFO [stderr]     |
Dec 18 10:32:19.965 INFO [stderr] 100 |     fn main() {
Dec 18 10:32:19.965 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]   --> src/ch5/semantic.rs:27:5
Dec 18 10:32:19.965 INFO [stderr]    |
Dec 18 10:32:19.965 INFO [stderr] 27 |     fn main() {
Dec 18 10:32:19.965 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]    --> src/ch5/semantic.rs:111:5
Dec 18 10:32:19.965 INFO [stderr]     |
Dec 18 10:32:19.965 INFO [stderr] 111 |     fn main(){
Dec 18 10:32:19.965 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]   --> src/ch5/share_mutable.rs:21:5
Dec 18 10:32:19.965 INFO [stderr]    |
Dec 18 10:32:19.965 INFO [stderr] 21 |     fn main() {
Dec 18 10:32:19.965 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]    --> src/ch5/share_mutable.rs:132:5
Dec 18 10:32:19.965 INFO [stderr]     |
Dec 18 10:32:19.965 INFO [stderr] 132 |     fn main(){
Dec 18 10:32:19.965 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `foo`
Dec 18 10:32:19.965 INFO [stderr]   --> src/ch5/borrow.rs:31:5
Dec 18 10:32:19.965 INFO [stderr]    |
Dec 18 10:32:19.965 INFO [stderr] 31 |     fn foo(mut v: [i32; 3]) -> [i32; 3] {
Dec 18 10:32:19.965 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]   --> src/ch5/borrow.rs:36:5
Dec 18 10:32:19.965 INFO [stderr]    |
Dec 18 10:32:19.965 INFO [stderr] 36 |     fn main() {
Dec 18 10:32:19.965 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `bubble_sort`
Dec 18 10:32:19.965 INFO [stderr]   --> src/ch5/borrow.rs:73:5
Dec 18 10:32:19.965 INFO [stderr]    |
Dec 18 10:32:19.965 INFO [stderr] 73 |     fn bubble_sort(a: &mut Vec<i32>) {
Dec 18 10:32:19.965 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]   --> src/ch5/borrow.rs:90:5
Dec 18 10:32:19.965 INFO [stderr]    |
Dec 18 10:32:19.965 INFO [stderr] 90 |     fn main() {
Dec 18 10:32:19.965 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `compute`
Dec 18 10:32:19.965 INFO [stderr]    --> src/ch5/borrow.rs:139:5
Dec 18 10:32:19.965 INFO [stderr]     |
Dec 18 10:32:19.965 INFO [stderr] 139 |     fn compute(input: &u32, output: &mut u32) {
Dec 18 10:32:19.965 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]    --> src/ch5/borrow.rs:147:5
Dec 18 10:32:19.965 INFO [stderr]     |
Dec 18 10:32:19.965 INFO [stderr] 147 |     fn main() {
Dec 18 10:32:19.965 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]   --> src/ch5/lifetime.rs:16:5
Dec 18 10:32:19.965 INFO [stderr]    |
Dec 18 10:32:19.965 INFO [stderr] 16 |     fn main() {
Dec 18 10:32:19.965 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]    --> src/ch5/lifetime.rs:239:5
Dec 18 10:32:19.965 INFO [stderr]     |
Dec 18 10:32:19.965 INFO [stderr] 239 |     fn main() {
Dec 18 10:32:19.965 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `foo`
Dec 18 10:32:19.965 INFO [stderr]    --> src/ch5/nll.rs:117:5
Dec 18 10:32:19.965 INFO [stderr]     |
Dec 18 10:32:19.965 INFO [stderr] 117 |     fn foo<'a>(x: &'a str, y: &'a str) -> &'a str {
Dec 18 10:32:19.965 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.965 INFO [stderr] 
Dec 18 10:32:19.965 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.965 INFO [stderr]    --> src/ch5/nll.rs:124:5
Dec 18 10:32:19.965 INFO [stderr]     |
Dec 18 10:32:19.966 INFO [stderr] 124 |     fn main(){
Dec 18 10:32:19.966 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.966 INFO [stderr] 
Dec 18 10:32:19.966 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.966 INFO [stderr]    --> src/ch5/nll.rs:181:5
Dec 18 10:32:19.966 INFO [stderr]     |
Dec 18 10:32:19.966 INFO [stderr] 181 |     fn main(){
Dec 18 10:32:19.966 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.966 INFO [stderr] 
Dec 18 10:32:19.970 INFO [stderr] warning: function is never used: `modify`
Dec 18 10:32:19.970 INFO [stderr]   --> src/ch6/functions.rs:30:5
Dec 18 10:32:19.970 INFO [stderr]    |
Dec 18 10:32:19.970 INFO [stderr] 30 |     fn modify(mut v: Vec<u32>) -> Vec<u32> {
Dec 18 10:32:19.970 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.970 INFO [stderr] 
Dec 18 10:32:19.970 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.970 INFO [stderr]   --> src/ch6/functions.rs:34:5
Dec 18 10:32:19.970 INFO [stderr]    |
Dec 18 10:32:19.970 INFO [stderr] 34 |     fn main(){
Dec 18 10:32:19.970 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `f`
Dec 18 10:32:19.971 INFO [stderr]   --> src/ch6/functions.rs:71:5
Dec 18 10:32:19.971 INFO [stderr]    |
Dec 18 10:32:19.971 INFO [stderr] 71 |     fn f() { print!("1"); }
Dec 18 10:32:19.971 INFO [stderr]    |     ^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.971 INFO [stderr]   --> src/ch6/functions.rs:72:5
Dec 18 10:32:19.971 INFO [stderr]    |
Dec 18 10:32:19.971 INFO [stderr] 72 |     fn main() {
Dec 18 10:32:19.971 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: struct is never constructed: `S`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:126:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 126 |     struct S { i: i32 }
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `f`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:127:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 127 |     fn f(ref _s: S) {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:130:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 130 |     fn main() {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `addsub`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:167:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 167 |     fn addsub(x: isize, y: isize) -> (isize, isize) {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:170:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 170 |     fn main(){
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `square`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:210:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 210 |     fn square<T: Mul<T, Output=T>>(x: T, y: T) -> T {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:213:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 213 |     fn main() {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: struct is never constructed: `User`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:249:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 249 |     struct User {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: method is never used: `show`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:254:9
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 254 |         fn show(&self)  {
Dec 18 10:32:19.971 INFO [stderr]     |         ^^^^^^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:259:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 259 |     fn main() {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `math`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:399:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 399 |     fn math(op: fn(i32, i32) -> i32, a: i32, b: i32) -> i32{
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `sum`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:402:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 402 |     fn sum(a: i32, b: i32) -> i32 {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `product`
Dec 18 10:32:19.971 INFO [stderr]    --> src/ch6/functions.rs:405:5
Dec 18 10:32:19.971 INFO [stderr]     |
Dec 18 10:32:19.971 INFO [stderr] 405 |     fn product(a: i32, b: i32) -> i32 {
Dec 18 10:32:19.971 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.971 INFO [stderr] 
Dec 18 10:32:19.971 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/functions.rs:408:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 408 |     fn main() {
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `counter`
Dec 18 10:32:19.972 INFO [stderr]   --> src/ch6/closures.rs:48:5
Dec 18 10:32:19.972 INFO [stderr]    |
Dec 18 10:32:19.972 INFO [stderr] 48 |     fn counter(i: i32) -> Box<Fn(i32) -> i32> {
Dec 18 10:32:19.972 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.972 INFO [stderr]   --> src/ch6/closures.rs:51:5
Dec 18 10:32:19.972 INFO [stderr]    |
Dec 18 10:32:19.972 INFO [stderr] 51 |     fn main() {
Dec 18 10:32:19.972 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: struct is never constructed: `Closure`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:125:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 125 |     struct Closure {
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `call_it`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:147:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 147 |     fn call_it<F: Fn() -> u32>(f: &F) -> u32 {
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `call_it_mut`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:150:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 150 |     fn call_it_mut<F: FnMut() -> u32>(f: &mut F) -> u32 {
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `call_it_once`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:153:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 153 |     fn call_it_once<F: FnOnce() -> u32>(f: F) -> u32 {
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:156:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 156 |     fn main() {
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:352:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 352 |     fn main() {
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `boxed_closure`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:512:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 512 |     fn boxed_closure(c: &mut Vec<Box<Fn()>>){
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:518:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 518 |     fn main(){
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `bar`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:638:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 638 |     fn bar(b: Box<for<'f> DoSomething<&'f usize>>) {
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/closures.rs:642:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 642 |     fn main(){
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.972 INFO [stderr]    --> src/ch6/iters.rs:373:5
Dec 18 10:32:19.972 INFO [stderr]     |
Dec 18 10:32:19.972 INFO [stderr] 373 |     fn main(){
Dec 18 10:32:19.972 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.972 INFO [stderr]   --> src/ch7/structs.rs:48:5
Dec 18 10:32:19.972 INFO [stderr]    |
Dec 18 10:32:19.972 INFO [stderr] 48 |     fn main(){
Dec 18 10:32:19.972 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:19.972 INFO [stderr] 
Dec 18 10:32:19.972 INFO [stderr] warning: function is never used: `hello`
Dec 18 10:32:19.973 INFO [stderr]   --> src/appendix/mod.rs:16:1
Dec 18 10:32:19.973 INFO [stderr]    |
Dec 18 10:32:19.973 INFO [stderr] 16 | fn hello(){
Dec 18 10:32:19.973 INFO [stderr]    | ^^^^^^^^^^
Dec 18 10:32:19.973 INFO [stderr] 
Dec 18 10:32:19.973 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:19.973 INFO [stderr]    --> src/appendix/lldb.rs:147:1
Dec 18 10:32:19.973 INFO [stderr]     |
Dec 18 10:32:19.973 INFO [stderr] 147 | fn main()
Dec 18 10:32:19.973 INFO [stderr]     | ^^^^^^^^^
Dec 18 10:32:19.973 INFO [stderr] 
Dec 18 10:32:19.984 INFO [stderr] warning: variable does not need to be mutable
Dec 18 10:32:19.984 INFO [stderr]   --> src/ch2/collections.rs:31:9
Dec 18 10:32:19.984 INFO [stderr]    |
Dec 18 10:32:19.984 INFO [stderr] 31 |     let mut v2 = vec![0; 10];
Dec 18 10:32:19.984 INFO [stderr]    |         ----^^
Dec 18 10:32:19.984 INFO [stderr]    |         |
Dec 18 10:32:19.984 INFO [stderr]    |         help: remove this `mut`
Dec 18 10:32:19.984 INFO [stderr]    |
Dec 18 10:32:19.984 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 10:32:19.984 INFO [stderr] 
Dec 18 10:32:19.992 INFO [stderr] warning: denote infinite loops with `loop { ... }`
Dec 18 10:32:19.992 INFO [stderr]    --> src/ch2/control_flow.rs:152:5
Dec 18 10:32:19.992 INFO [stderr]     |
Dec 18 10:32:19.992 INFO [stderr] 152 |     while true {
Dec 18 10:32:19.992 INFO [stderr]     |     ^^^^^^^^^^ help: use `loop`
Dec 18 10:32:19.992 INFO [stderr]     |
Dec 18 10:32:19.992 INFO [stderr]     = note: #[warn(while_true)] on by default
Dec 18 10:32:19.992 INFO [stderr] 
Dec 18 10:32:20.000 INFO [stderr] warning: unused arithmetic operation that must be used
Dec 18 10:32:20.000 INFO [stderr]    --> src/ch5/nll.rs:184:9
Dec 18 10:32:20.000 INFO [stderr]     |
Dec 18 10:32:20.000 INFO [stderr] 184 |         a.to_string() + s;
Dec 18 10:32:20.000 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.000 INFO [stderr]     |
Dec 18 10:32:20.000 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 10:32:20.000 INFO [stderr] 
Dec 18 10:32:20.008 INFO [stderr] warning: unused attribute
Dec 18 10:32:20.008 INFO [stderr]    --> src/ch6/closures.rs:124:5
Dec 18 10:32:20.008 INFO [stderr]     |
Dec 18 10:32:20.008 INFO [stderr] 124 |     #![feature(unboxed_closures, fn_traits)]
Dec 18 10:32:20.008 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.008 INFO [stderr]     |
Dec 18 10:32:20.008 INFO [stderr]     = note: #[warn(unused_attributes)] on by default
Dec 18 10:32:20.008 INFO [stderr] 
Dec 18 10:32:20.008 INFO [stderr] warning: crate-level attribute should be in the root module
Dec 18 10:32:20.008 INFO [stderr]    --> src/ch6/closures.rs:124:5
Dec 18 10:32:20.008 INFO [stderr]     |
Dec 18 10:32:20.008 INFO [stderr] 124 |     #![feature(unboxed_closures, fn_traits)]
Dec 18 10:32:20.008 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.008 INFO [stderr] 
Dec 18 10:32:20.400 INFO [stderr] warning: function is never used: `sum`
Dec 18 10:32:20.400 INFO [stderr]   --> src/ch2/function.rs:89:1
Dec 18 10:32:20.400 INFO [stderr]    |
Dec 18 10:32:20.400 INFO [stderr] 89 | fn sum(a: i32, b: i32) -> i32 {
Dec 18 10:32:20.400 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.400 INFO [stderr]    |
Dec 18 10:32:20.400 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 18 10:32:20.400 INFO [stderr] 
Dec 18 10:32:20.400 INFO [stderr] warning: function is never used: `product`
Dec 18 10:32:20.400 INFO [stderr]   --> src/ch2/function.rs:92:1
Dec 18 10:32:20.400 INFO [stderr]    |
Dec 18 10:32:20.400 INFO [stderr] 92 | fn product(a: i32, b: i32) -> i32 {
Dec 18 10:32:20.400 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.400 INFO [stderr] 
Dec 18 10:32:20.400 INFO [stderr] warning: function is never used: `map_demo`
Dec 18 10:32:20.400 INFO [stderr]    --> src/ch2/collections.rs:169:1
Dec 18 10:32:20.400 INFO [stderr]     |
Dec 18 10:32:20.400 INFO [stderr] 169 | fn map_demo() {
Dec 18 10:32:20.400 INFO [stderr]     | ^^^^^^^^^^^^^
Dec 18 10:32:20.400 INFO [stderr] 
Dec 18 10:32:20.400 INFO [stderr] warning: function is never used: `foo`
Dec 18 10:32:20.400 INFO [stderr]    --> src/ch2/primitives.rs:349:1
Dec 18 10:32:20.400 INFO [stderr]     |
Dec 18 10:32:20.400 INFO [stderr] 349 | fn foo() -> u32 {
Dec 18 10:32:20.400 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 18 10:32:20.400 INFO [stderr] 
Dec 18 10:32:20.400 INFO [stderr] warning: method is never used: `new`
Dec 18 10:32:20.400 INFO [stderr]   --> src/ch2/structs.rs:48:5
Dec 18 10:32:20.400 INFO [stderr]    |
Dec 18 10:32:20.400 INFO [stderr] 48 |     fn new(name: &'static str, gender: u32) -> Self{
Dec 18 10:32:20.400 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.400 INFO [stderr] 
Dec 18 10:32:20.400 INFO [stderr] warning: method is never used: `name`
Dec 18 10:32:20.400 INFO [stderr]   --> src/ch2/structs.rs:51:5
Dec 18 10:32:20.400 INFO [stderr]    |
Dec 18 10:32:20.400 INFO [stderr] 51 |     fn name(&self) {
Dec 18 10:32:20.400 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 18 10:32:20.400 INFO [stderr] 
Dec 18 10:32:20.400 INFO [stderr] warning: method is never used: `set_name`
Dec 18 10:32:20.400 INFO [stderr]   --> src/ch2/structs.rs:54:5
Dec 18 10:32:20.400 INFO [stderr]    |
Dec 18 10:32:20.400 INFO [stderr] 54 |     fn set_name(&mut self, name: &'static str)  {
Dec 18 10:32:20.400 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.400 INFO [stderr] 
Dec 18 10:32:20.400 INFO [stderr] warning: method is never used: `gender`
Dec 18 10:32:20.400 INFO [stderr]   --> src/ch2/structs.rs:57:5
Dec 18 10:32:20.400 INFO [stderr]    |
Dec 18 10:32:20.400 INFO [stderr] 57 |     fn gender(&self){
Dec 18 10:32:20.400 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 18 10:32:20.400 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: field is never used: `foo`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch3/zero_size.rs:27:9
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.401 INFO [stderr] 27 |         foo: Foo,
Dec 18 10:32:20.401 INFO [stderr]    |         ^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: field is never used: `qux`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch3/zero_size.rs:28:9
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.401 INFO [stderr] 28 |         qux: (),
Dec 18 10:32:20.401 INFO [stderr]    |         ^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: field is never used: `baz`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch3/zero_size.rs:29:9
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.401 INFO [stderr] 29 |         baz: [u8; 0],
Dec 18 10:32:20.401 INFO [stderr]    |         ^^^^^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: field is never used: `page`
Dec 18 10:32:20.401 INFO [stderr]    --> src/ch3/traits.rs:262:24
Dec 18 10:32:20.401 INFO [stderr]     |
Dec 18 10:32:20.401 INFO [stderr] 262 |     struct MyPaginate{ page: i32 }
Dec 18 10:32:20.401 INFO [stderr]     |                        ^^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: field is never used: `inner`
Dec 18 10:32:20.401 INFO [stderr]    --> src/ch3/trait_limit.rs:147:9
Dec 18 10:32:20.401 INFO [stderr]     |
Dec 18 10:32:20.401 INFO [stderr] 147 |         inner: T,
Dec 18 10:32:20.401 INFO [stderr]     |         ^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: function is never used: `foo`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch4/general_concepts.rs:17:5
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.401 INFO [stderr] 17 |     fn foo(x: u32) {
Dec 18 10:32:20.401 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch4/general_concepts.rs:21:5
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.401 INFO [stderr] 21 |     fn main(){
Dec 18 10:32:20.401 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: struct is never constructed: `A`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch4/general_concepts.rs:56:5
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.401 INFO [stderr] 56 |     struct A {
Dec 18 10:32:20.401 INFO [stderr]    |     ^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch4/general_concepts.rs:61:5
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.401 INFO [stderr] 61 |     fn main() {
Dec 18 10:32:20.401 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: struct is never constructed: `A`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch4/general_concepts.rs:96:5
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.401 INFO [stderr] 96 |     struct A {
Dec 18 10:32:20.401 INFO [stderr]    |     ^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: struct is never constructed: `B`
Dec 18 10:32:20.401 INFO [stderr]    --> src/ch4/general_concepts.rs:100:5
Dec 18 10:32:20.401 INFO [stderr]     |
Dec 18 10:32:20.401 INFO [stderr] 100 |     struct B(i32, f64, char);
Dec 18 10:32:20.401 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: struct is never constructed: `N`
Dec 18 10:32:20.401 INFO [stderr]    --> src/ch4/general_concepts.rs:101:5
Dec 18 10:32:20.401 INFO [stderr]     |
Dec 18 10:32:20.401 INFO [stderr] 101 |     struct N;
Dec 18 10:32:20.401 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: enum is never used: `E`
Dec 18 10:32:20.401 INFO [stderr]    --> src/ch4/general_concepts.rs:102:5
Dec 18 10:32:20.401 INFO [stderr]     |
Dec 18 10:32:20.401 INFO [stderr] 102 |     enum E {
Dec 18 10:32:20.401 INFO [stderr]     |     ^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: union is never used: `U`
Dec 18 10:32:20.401 INFO [stderr]    --> src/ch4/general_concepts.rs:106:5
Dec 18 10:32:20.401 INFO [stderr]     |
Dec 18 10:32:20.401 INFO [stderr] 106 |     union U {
Dec 18 10:32:20.401 INFO [stderr]     |     ^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.401 INFO [stderr]    --> src/ch4/general_concepts.rs:110:5
Dec 18 10:32:20.401 INFO [stderr]     |
Dec 18 10:32:20.401 INFO [stderr] 110 |     fn main(){
Dec 18 10:32:20.401 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.401 INFO [stderr] 
Dec 18 10:32:20.401 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.401 INFO [stderr]   --> src/ch4/resource_management.rs:59:5
Dec 18 10:32:20.401 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 59 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch4/raii.rs:13:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 13 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: struct is never constructed: `S`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch4/raii.rs:94:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 94 |     struct S(i32);
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]    --> src/ch4/raii.rs:100:5
Dec 18 10:32:20.402 INFO [stderr]     |
Dec 18 10:32:20.402 INFO [stderr] 100 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch5/semantic.rs:27:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 27 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]    --> src/ch5/semantic.rs:111:5
Dec 18 10:32:20.402 INFO [stderr]     |
Dec 18 10:32:20.402 INFO [stderr] 111 |     fn main(){
Dec 18 10:32:20.402 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch5/share_mutable.rs:21:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 21 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]    --> src/ch5/share_mutable.rs:132:5
Dec 18 10:32:20.402 INFO [stderr]     |
Dec 18 10:32:20.402 INFO [stderr] 132 |     fn main(){
Dec 18 10:32:20.402 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `foo`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch5/borrow.rs:31:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 31 |     fn foo(mut v: [i32; 3]) -> [i32; 3] {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch5/borrow.rs:36:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 36 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `bubble_sort`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch5/borrow.rs:73:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 73 |     fn bubble_sort(a: &mut Vec<i32>) {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch5/borrow.rs:90:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 90 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `compute`
Dec 18 10:32:20.402 INFO [stderr]    --> src/ch5/borrow.rs:139:5
Dec 18 10:32:20.402 INFO [stderr]     |
Dec 18 10:32:20.402 INFO [stderr] 139 |     fn compute(input: &u32, output: &mut u32) {
Dec 18 10:32:20.402 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]    --> src/ch5/borrow.rs:147:5
Dec 18 10:32:20.402 INFO [stderr]     |
Dec 18 10:32:20.402 INFO [stderr] 147 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]   --> src/ch5/lifetime.rs:16:5
Dec 18 10:32:20.402 INFO [stderr]    |
Dec 18 10:32:20.402 INFO [stderr] 16 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.402 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.402 INFO [stderr]    --> src/ch5/lifetime.rs:239:5
Dec 18 10:32:20.402 INFO [stderr]     |
Dec 18 10:32:20.402 INFO [stderr] 239 |     fn main() {
Dec 18 10:32:20.402 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.402 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `foo`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch5/nll.rs:117:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 117 |     fn foo<'a>(x: &'a str, y: &'a str) -> &'a str {
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch5/nll.rs:124:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 124 |     fn main(){
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch5/nll.rs:181:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 181 |     fn main(){
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `modify`
Dec 18 10:32:20.403 INFO [stderr]   --> src/ch6/functions.rs:30:5
Dec 18 10:32:20.403 INFO [stderr]    |
Dec 18 10:32:20.403 INFO [stderr] 30 |     fn modify(mut v: Vec<u32>) -> Vec<u32> {
Dec 18 10:32:20.403 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.403 INFO [stderr]   --> src/ch6/functions.rs:34:5
Dec 18 10:32:20.403 INFO [stderr]    |
Dec 18 10:32:20.403 INFO [stderr] 34 |     fn main(){
Dec 18 10:32:20.403 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `f`
Dec 18 10:32:20.403 INFO [stderr]   --> src/ch6/functions.rs:71:5
Dec 18 10:32:20.403 INFO [stderr]    |
Dec 18 10:32:20.403 INFO [stderr] 71 |     fn f() { print!("1"); }
Dec 18 10:32:20.403 INFO [stderr]    |     ^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.403 INFO [stderr]   --> src/ch6/functions.rs:72:5
Dec 18 10:32:20.403 INFO [stderr]    |
Dec 18 10:32:20.403 INFO [stderr] 72 |     fn main() {
Dec 18 10:32:20.403 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: struct is never constructed: `S`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:126:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 126 |     struct S { i: i32 }
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `f`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:127:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 127 |     fn f(ref _s: S) {
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:130:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 130 |     fn main() {
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `addsub`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:167:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 167 |     fn addsub(x: isize, y: isize) -> (isize, isize) {
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:170:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 170 |     fn main(){
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `square`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:210:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 210 |     fn square<T: Mul<T, Output=T>>(x: T, y: T) -> T {
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:213:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 213 |     fn main() {
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: struct is never constructed: `User`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:249:5
Dec 18 10:32:20.403 INFO [stderr]     |
Dec 18 10:32:20.403 INFO [stderr] 249 |     struct User {
Dec 18 10:32:20.403 INFO [stderr]     |     ^^^^^^^^^^^
Dec 18 10:32:20.403 INFO [stderr] 
Dec 18 10:32:20.403 INFO [stderr] warning: method is never used: `show`
Dec 18 10:32:20.403 INFO [stderr]    --> src/ch6/functions.rs:254:9
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 254 |         fn show(&self)  {
Dec 18 10:32:20.404 INFO [stderr]     |         ^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/functions.rs:259:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 259 |     fn main() {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `math`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/functions.rs:399:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 399 |     fn math(op: fn(i32, i32) -> i32, a: i32, b: i32) -> i32{
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `sum`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/functions.rs:402:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 402 |     fn sum(a: i32, b: i32) -> i32 {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `product`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/functions.rs:405:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 405 |     fn product(a: i32, b: i32) -> i32 {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/functions.rs:408:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 408 |     fn main() {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `counter`
Dec 18 10:32:20.404 INFO [stderr]   --> src/ch6/closures.rs:48:5
Dec 18 10:32:20.404 INFO [stderr]    |
Dec 18 10:32:20.404 INFO [stderr] 48 |     fn counter(i: i32) -> Box<Fn(i32) -> i32> {
Dec 18 10:32:20.404 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.404 INFO [stderr]   --> src/ch6/closures.rs:51:5
Dec 18 10:32:20.404 INFO [stderr]    |
Dec 18 10:32:20.404 INFO [stderr] 51 |     fn main() {
Dec 18 10:32:20.404 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: struct is never constructed: `Closure`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/closures.rs:125:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 125 |     struct Closure {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `call_it`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/closures.rs:147:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 147 |     fn call_it<F: Fn() -> u32>(f: &F) -> u32 {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `call_it_mut`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/closures.rs:150:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 150 |     fn call_it_mut<F: FnMut() -> u32>(f: &mut F) -> u32 {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `call_it_once`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/closures.rs:153:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 153 |     fn call_it_once<F: FnOnce() -> u32>(f: F) -> u32 {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/closures.rs:156:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 156 |     fn main() {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/closures.rs:352:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 352 |     fn main() {
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `boxed_closure`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/closures.rs:512:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.404 INFO [stderr] 512 |     fn boxed_closure(c: &mut Vec<Box<Fn()>>){
Dec 18 10:32:20.404 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.404 INFO [stderr] 
Dec 18 10:32:20.404 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.404 INFO [stderr]    --> src/ch6/closures.rs:518:5
Dec 18 10:32:20.404 INFO [stderr]     |
Dec 18 10:32:20.405 INFO [stderr] 518 |     fn main(){
Dec 18 10:32:20.405 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.405 INFO [stderr] 
Dec 18 10:32:20.405 INFO [stderr] warning: function is never used: `bar`
Dec 18 10:32:20.405 INFO [stderr]    --> src/ch6/closures.rs:638:5
Dec 18 10:32:20.405 INFO [stderr]     |
Dec 18 10:32:20.405 INFO [stderr] 638 |     fn bar(b: Box<for<'f> DoSomething<&'f usize>>) {
Dec 18 10:32:20.405 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.405 INFO [stderr] 
Dec 18 10:32:20.405 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.405 INFO [stderr]    --> src/ch6/closures.rs:642:5
Dec 18 10:32:20.405 INFO [stderr]     |
Dec 18 10:32:20.405 INFO [stderr] 642 |     fn main(){
Dec 18 10:32:20.405 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.405 INFO [stderr] 
Dec 18 10:32:20.405 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.405 INFO [stderr]    --> src/ch6/iters.rs:373:5
Dec 18 10:32:20.405 INFO [stderr]     |
Dec 18 10:32:20.405 INFO [stderr] 373 |     fn main(){
Dec 18 10:32:20.405 INFO [stderr]     |     ^^^^^^^^^
Dec 18 10:32:20.405 INFO [stderr] 
Dec 18 10:32:20.405 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.405 INFO [stderr]   --> src/ch7/structs.rs:48:5
Dec 18 10:32:20.405 INFO [stderr]    |
Dec 18 10:32:20.405 INFO [stderr] 48 |     fn main(){
Dec 18 10:32:20.405 INFO [stderr]    |     ^^^^^^^^^
Dec 18 10:32:20.405 INFO [stderr] 
Dec 18 10:32:20.405 INFO [stderr] warning: function is never used: `hello`
Dec 18 10:32:20.405 INFO [stderr]   --> src/appendix/mod.rs:16:1
Dec 18 10:32:20.405 INFO [stderr]    |
Dec 18 10:32:20.405 INFO [stderr] 16 | fn hello(){
Dec 18 10:32:20.405 INFO [stderr]    | ^^^^^^^^^^
Dec 18 10:32:20.405 INFO [stderr] 
Dec 18 10:32:20.405 INFO [stderr] warning: function is never used: `main`
Dec 18 10:32:20.405 INFO [stderr]    --> src/appendix/lldb.rs:147:1
Dec 18 10:32:20.405 INFO [stderr]     |
Dec 18 10:32:20.405 INFO [stderr] 147 | fn main()
Dec 18 10:32:20.405 INFO [stderr]     | ^^^^^^^^^
Dec 18 10:32:20.405 INFO [stderr] 
Dec 18 10:32:20.405 INFO [stderr] warning: denote infinite loops with `loop { ... }`
Dec 18 10:32:20.405 INFO [stderr]    --> src/ch2/control_flow.rs:152:5
Dec 18 10:32:20.405 INFO [stderr]     |
Dec 18 10:32:20.405 INFO [stderr] 152 |     while true {
Dec 18 10:32:20.405 INFO [stderr]     |     ^^^^^^^^^^ help: use `loop`
Dec 18 10:32:20.405 INFO [stderr]     |
Dec 18 10:32:20.405 INFO [stderr]     = note: #[warn(while_true)] on by default
Dec 18 10:32:20.405 INFO [stderr] 
Dec 18 10:32:20.420 INFO [stderr] warning: unused arithmetic operation that must be used
Dec 18 10:32:20.420 INFO [stderr]    --> src/ch5/nll.rs:184:9
Dec 18 10:32:20.420 INFO [stderr]     |
Dec 18 10:32:20.420 INFO [stderr] 184 |         a.to_string() + s;
Dec 18 10:32:20.420 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.420 INFO [stderr]     |
Dec 18 10:32:20.420 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 10:32:20.420 INFO [stderr] 
Dec 18 10:32:20.420 INFO [stderr] warning: unused attribute
Dec 18 10:32:20.420 INFO [stderr]    --> src/ch6/closures.rs:124:5
Dec 18 10:32:20.420 INFO [stderr]     |
Dec 18 10:32:20.420 INFO [stderr] 124 |     #![feature(unboxed_closures, fn_traits)]
Dec 18 10:32:20.420 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.420 INFO [stderr]     |
Dec 18 10:32:20.420 INFO [stderr]     = note: #[warn(unused_attributes)] on by default
Dec 18 10:32:20.420 INFO [stderr] 
Dec 18 10:32:20.420 INFO [stderr] warning: crate-level attribute should be in the root module
Dec 18 10:32:20.420 INFO [stderr]    --> src/ch6/closures.rs:124:5
Dec 18 10:32:20.420 INFO [stderr]     |
Dec 18 10:32:20.420 INFO [stderr] 124 |     #![feature(unboxed_closures, fn_traits)]
Dec 18 10:32:20.420 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 10:32:20.420 INFO [stderr] 
Dec 18 10:32:20.496 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.87s
Dec 18 10:32:21.094 INFO running `"docker" "inspect" "7900812560e351e195b746d5ee1264dc12b015158e67960499a7948b1788c758"`
Dec 18 10:32:21.392 INFO running `"docker" "rm" "-f" "7900812560e351e195b746d5ee1264dc12b015158e67960499a7948b1788c758"`
Dec 18 10:32:21.676 INFO [stdout] 7900812560e351e195b746d5ee1264dc12b015158e67960499a7948b1788c758