[INFO] updating cached repository CharlesGe129/learn_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/CharlesGe129/learn_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/CharlesGe129/learn_rust" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/CharlesGe129/learn_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/CharlesGe129/learn_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/CharlesGe129/learn_rust" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/CharlesGe129/learn_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/CharlesGe129/learn_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fc393476917d2ec95a39b0022e045a93291122bb
[INFO] sha for GitHub repo CharlesGe129/learn_rust: fc393476917d2ec95a39b0022e045a93291122bb
[INFO] validating manifest of CharlesGe129/learn_rust on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of CharlesGe129/learn_rust on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing CharlesGe129/learn_rust
[INFO] finished frobbing CharlesGe129/learn_rust
[INFO] frobbed toml for CharlesGe129/learn_rust written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/CharlesGe129/learn_rust/Cargo.toml
[INFO] started frobbing CharlesGe129/learn_rust
[INFO] finished frobbing CharlesGe129/learn_rust
[INFO] frobbed toml for CharlesGe129/learn_rust written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/CharlesGe129/learn_rust/Cargo.toml
[INFO] crate CharlesGe129/learn_rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking CharlesGe129/learn_rust against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-2/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/CharlesGe129/learn_rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4469c2da67aa49a407ace8c07d1b49ebe3a92836d224e3ef7d28b44b2781afd5
[INFO] running `"docker" "start" "-a" "4469c2da67aa49a407ace8c07d1b49ebe3a92836d224e3ef7d28b44b2781afd5"`
[INFO] [stderr]     Checking learn_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: type `Point_mut` should have an upper camel case name
[INFO] [stderr]   --> src/struct.rs:44:12
[INFO] [stderr]    |
[INFO] [stderr] 44 |     struct Point_mut {
[INFO] [stderr]    |            ^^^^^^^^^ help: convert the identifier to upper camel case: `PointMut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_camel_case_types)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::env`
[INFO] [stderr]  --> src/problems/triangle_expensive_path.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     use std::env;
[INFO] [stderr]   |         ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `Point_mut` should have an upper camel case name
[INFO] [stderr]   --> src/struct.rs:44:12
[INFO] [stderr]    |
[INFO] [stderr] 44 |     struct Point_mut {
[INFO] [stderr]    |            ^^^^^^^^^ help: convert the identifier to upper camel case: `PointMut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_camel_case_types)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::env`
[INFO] [stderr]  --> src/problems/triangle_expensive_path.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     use std::env;
[INFO] [stderr]   |         ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/control_flow.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |         println!("No print, outer has been break");
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unreachable_code)] on by default
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/control_flow.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |         println!("No print, outer has been break");
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unreachable_code)] on by default
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/array.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/array.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let v: Vec<i32> = vec![];
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/str.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let hello = "hello world!";
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/str.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let hello: &'static str = "hello world!";
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `hello` is never read
[INFO] [stderr]  --> src/str.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let mut hello = String::new();
[INFO] [stderr]   |             ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `point`
[INFO] [stderr]  --> src/struct.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let point = Point{x: 1, y: 2};
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_point`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `green`
[INFO] [stderr]   --> src/struct.rs:14:20
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let Color(red, green, blue) = android_green;
[INFO] [stderr]    |                    ^^^^^ help: consider prefixing with an underscore: `_green`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `blue`
[INFO] [stderr]   --> src/struct.rs:14:27
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let Color(red, green, blue) = android_green;
[INFO] [stderr]    |                           ^^^^ help: consider prefixing with an underscore: `_blue`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `couple`
[INFO] [stderr]   --> src/generics.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let couple = make_pair("male", "female");
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_couple`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `int_origin`
[INFO] [stderr]   --> src/generics.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let int_origin = Point { x: 0, y: 0 };
[INFO] [stderr]    |         ^^^^^^^^^^ help: consider prefixing with an underscore: `_int_origin`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `float_origin`
[INFO] [stderr]   --> src/generics.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let float_origin = Point { x: 0.0, y: 0.0 };
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_float_origin`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/array.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/array.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let v: Vec<i32> = vec![];
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/str.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let hello = "hello world!";
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/str.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let hello: &'static str = "hello world!";
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `hello` is never read
[INFO] [stderr]  --> src/str.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let mut hello = String::new();
[INFO] [stderr]   |             ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `point`
[INFO] [stderr]  --> src/struct.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let point = Point{x: 1, y: 2};
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_point`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `green`
[INFO] [stderr]   --> src/struct.rs:14:20
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let Color(red, green, blue) = android_green;
[INFO] [stderr]    |                    ^^^^^ help: consider prefixing with an underscore: `_green`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `blue`
[INFO] [stderr]   --> src/struct.rs:14:27
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let Color(red, green, blue) = android_green;
[INFO] [stderr]    |                           ^^^^ help: consider prefixing with an underscore: `_blue`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `couple`
[INFO] [stderr]   --> src/generics.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let couple = make_pair("male", "female");
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_couple`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `int_origin`
[INFO] [stderr]   --> src/generics.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let int_origin = Point { x: 0, y: 0 };
[INFO] [stderr]    |         ^^^^^^^^^^ help: consider prefixing with an underscore: `_int_origin`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `float_origin`
[INFO] [stderr]   --> src/generics.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let float_origin = Point { x: 0.0, y: 0.0 };
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_float_origin`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/array.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let mut array: [i32; 3] = [0; 3];
[INFO] [stderr]   |         ----^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/array.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let mut array: [i32; 3] = [0; 3];
[INFO] [stderr]   |         ----^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/function.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut temp = num;
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/function.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut temp = num;
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/io.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut input = String::new();
[INFO] [stderr]    |         ----^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/io.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut input = String::new();
[INFO] [stderr]    |         ----^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `display_test`
[INFO] [stderr]  --> src/display.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn display_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `List`
[INFO] [stderr]  --> src/complicated/list.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct List(Vec<i32>);
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `list_test`
[INFO] [stderr]   --> src/complicated/list.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn list_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `literal_operator_test`
[INFO] [stderr]  --> src/literals_operators.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn literal_operator_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `array_test`
[INFO] [stderr]  --> src/array.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn array_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `str_test`
[INFO] [stderr]  --> src/str.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn str_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `struct_test`
[INFO] [stderr]  --> src/struct.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn struct_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `control_flow_test`
[INFO] [stderr]  --> src/control_flow.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn control_flow_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `if_test`
[INFO] [stderr]  --> src/control_flow.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn if_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `for_test`
[INFO] [stderr]   --> src/control_flow.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn for_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `while_test`
[INFO] [stderr]   --> src/control_flow.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn while_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `match_test`
[INFO] [stderr]   --> src/control_flow.rs:40:1
[INFO] [stderr]    |
[INFO] [stderr] 40 | fn match_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function_test`
[INFO] [stderr]  --> src/function.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn function_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_one`
[INFO] [stderr]  --> src/function.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn add_one(x: i32) -> i32 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `diverges`
[INFO] [stderr]   --> src/function.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn diverges() -> ! {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `closure`
[INFO] [stderr]   --> src/function.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn closure() {
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `high_order_function`
[INFO] [stderr]   --> src/function.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn high_order_function() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `method_test`
[INFO] [stderr]  --> src/method.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn method_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `trait_test`
[INFO] [stderr]  --> src/trait.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn trait_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `trait_with_generics`
[INFO] [stderr]   --> src/trait.rs:55:1
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn trait_with_generics() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `inheritance_test`
[INFO] [stderr]  --> src/inheritance.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn inheritance_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generics_test`
[INFO] [stderr]  --> src/generics.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn generics_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generics`
[INFO] [stderr]  --> src/generics.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn generics() {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `polymorphism`
[INFO] [stderr]   --> src/generics.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn polymorphism() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_test`
[INFO] [stderr]   --> src/generics.rs:58:1
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn add_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `io_test`
[INFO] [stderr]  --> src/io.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn io_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `std_in`
[INFO] [stderr]   --> src/io.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn std_in() {
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `file_out`
[INFO] [stderr]   --> src/io.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn file_out() {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `file_out_example2`
[INFO] [stderr]   --> src/io.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | fn file_out_example2() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `file_in`
[INFO] [stderr]   --> src/io.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn file_in() {
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Stack`
[INFO] [stderr]  --> src/problems/verify_closable.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Stack {
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `LEFT_CHARS`
[INFO] [stderr]  --> src/problems/verify_closable.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | static LEFT_CHARS: &'static str = "({[";
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/problems/verify_closable.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn new() -> Stack {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push`
[INFO] [stderr]   --> src/problems/verify_closable.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn push(&mut self, s: String) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pop`
[INFO] [stderr]   --> src/problems/verify_closable.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn pop(&mut self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print`
[INFO] [stderr]   --> src/problems/verify_closable.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn print(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `verify_closable_test`
[INFO] [stderr]   --> src/problems/verify_closable.rs:49:1
[INFO] [stderr]    |
[INFO] [stderr] 49 | fn verify_closable_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `verify_closable`
[INFO] [stderr]   --> src/problems/verify_closable.rs:61:1
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn verify_closable(input_str: &str) -> bool {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `examples`
[INFO] [stderr]   --> src/main.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn examples() {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/trait.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |         s.clone();
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/trait.rs:64:9
[INFO] [stderr]    |
[INFO] [stderr] 64 |         s.clone();
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `display_test`
[INFO] [stderr]  --> src/display.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn display_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `List`
[INFO] [stderr]  --> src/complicated/list.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct List(Vec<i32>);
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `list_test`
[INFO] [stderr]   --> src/complicated/list.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn list_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `literal_operator_test`
[INFO] [stderr]  --> src/literals_operators.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn literal_operator_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `array_test`
[INFO] [stderr]  --> src/array.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn array_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `str_test`
[INFO] [stderr]  --> src/str.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn str_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `struct_test`
[INFO] [stderr]  --> src/struct.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn struct_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `control_flow_test`
[INFO] [stderr]  --> src/control_flow.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn control_flow_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `if_test`
[INFO] [stderr]  --> src/control_flow.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn if_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `for_test`
[INFO] [stderr]   --> src/control_flow.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn for_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `while_test`
[INFO] [stderr]   --> src/control_flow.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn while_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `match_test`
[INFO] [stderr]   --> src/control_flow.rs:40:1
[INFO] [stderr]    |
[INFO] [stderr] 40 | fn match_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function_test`
[INFO] [stderr]  --> src/function.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn function_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_one`
[INFO] [stderr]  --> src/function.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn add_one(x: i32) -> i32 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `diverges`
[INFO] [stderr]   --> src/function.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn diverges() -> ! {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `closure`
[INFO] [stderr]   --> src/function.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn closure() {
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `high_order_function`
[INFO] [stderr]   --> src/function.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn high_order_function() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `method_test`
[INFO] [stderr]  --> src/method.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn method_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `trait_test`
[INFO] [stderr]  --> src/trait.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn trait_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `trait_with_generics`
[INFO] [stderr]   --> src/trait.rs:55:1
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn trait_with_generics() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `inheritance_test`
[INFO] [stderr]  --> src/inheritance.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn inheritance_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generics_test`
[INFO] [stderr]  --> src/generics.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn generics_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generics`
[INFO] [stderr]  --> src/generics.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn generics() {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `polymorphism`
[INFO] [stderr]   --> src/generics.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn polymorphism() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_test`
[INFO] [stderr]   --> src/generics.rs:58:1
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn add_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `io_test`
[INFO] [stderr]  --> src/io.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn io_test() {
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `std_in`
[INFO] [stderr]   --> src/io.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn std_in() {
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `file_out`
[INFO] [stderr]   --> src/io.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn file_out() {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `file_out_example2`
[INFO] [stderr]   --> src/io.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | fn file_out_example2() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `file_in`
[INFO] [stderr]   --> src/io.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn file_in() {
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Stack`
[INFO] [stderr]  --> src/problems/verify_closable.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Stack {
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `LEFT_CHARS`
[INFO] [stderr]  --> src/problems/verify_closable.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | static LEFT_CHARS: &'static str = "({[";
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/problems/verify_closable.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn new() -> Stack {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push`
[INFO] [stderr]   --> src/problems/verify_closable.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn push(&mut self, s: String) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pop`
[INFO] [stderr]   --> src/problems/verify_closable.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn pop(&mut self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print`
[INFO] [stderr]   --> src/problems/verify_closable.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn print(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `verify_closable_test`
[INFO] [stderr]   --> src/problems/verify_closable.rs:49:1
[INFO] [stderr]    |
[INFO] [stderr] 49 | fn verify_closable_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `verify_closable`
[INFO] [stderr]   --> src/problems/verify_closable.rs:61:1
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn verify_closable(input_str: &str) -> bool {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `examples`
[INFO] [stderr]   --> src/main.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn examples() {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/trait.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |         s.clone();
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/trait.rs:64:9
[INFO] [stderr]    |
[INFO] [stderr] 64 |         s.clone();
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
[INFO] running `"docker" "inspect" "4469c2da67aa49a407ace8c07d1b49ebe3a92836d224e3ef7d28b44b2781afd5"`
[INFO] running `"docker" "rm" "-f" "4469c2da67aa49a407ace8c07d1b49ebe3a92836d224e3ef7d28b44b2781afd5"`
[INFO] [stdout] 4469c2da67aa49a407ace8c07d1b49ebe3a92836d224e3ef7d28b44b2781afd5