[INFO] updating cached repository https://github.com/abrcdf1023/rust_hello_world
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/abrcdf1023/rust_hello_world
[INFO] [stderr]    e29b54e..4ed02ac  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4ed02acafef817d22163cac6aaff6b686498a218
[INFO] testing abrcdf1023/rust_hello_world against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabrcdf1023%2Frust_hello_world" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/abrcdf1023/rust_hello_world on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/abrcdf1023/rust_hello_world
[INFO] finished tweaking git repo https://github.com/abrcdf1023/rust_hello_world
[INFO] tweaked toml for git repo https://github.com/abrcdf1023/rust_hello_world written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/abrcdf1023/rust_hello_world already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] d641439f6b825cd64d425460d4db721f982812e5f5a1da04255f26573f923bda
[INFO] running `"docker" "start" "-a" "d641439f6b825cd64d425460d4db721f982812e5f5a1da04255f26573f923bda"`
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling rust_hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/datatype.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/datatype.rs:48:7
[INFO] [stderr]    |
[INFO] [stderr] 48 |   let y: i64 = 30; 
[INFO] [stderr]    |       ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/datatype.rs:123:8
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |        ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]    --> src/datatype.rs:123:14
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |              ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/datatype.rs:145:7
[INFO] [stderr]     |
[INFO] [stderr] 145 |   let a: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]  --> src/ownership.rs:3:7
[INFO] [stderr]   |
[INFO] [stderr] 3 |   let y = x;
[INFO] [stderr]   |       ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]  --> src/ownership.rs:6:7
[INFO] [stderr]   |
[INFO] [stderr] 6 |   let s2 = s1;
[INFO] [stderr]   |       ^^ help: consider prefixing with an underscore: `_s2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]   --> src/ownership.rs:72:7
[INFO] [stderr]    |
[INFO] [stderr] 72 |   let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_s1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/references.rs:81:11
[INFO] [stderr]    |
[INFO] [stderr] 81 |       let r1 = &mut s;
[INFO] [stderr]    |           ^^ help: consider prefixing with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]   --> src/references.rs:85:7
[INFO] [stderr]    |
[INFO] [stderr] 85 |   let r2 = &mut s;
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_number`
[INFO] [stderr]  --> src/guess.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn guess_number() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutable`
[INFO] [stderr]   --> src/datatype.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn mutable() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `variables_shadowing`
[INFO] [stderr]   --> src/datatype.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn variables_shadowing() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types`
[INFO] [stderr]   --> src/datatype.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | pub fn data_types() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_integer`
[INFO] [stderr]   --> src/datatype.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn data_types_integer() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_float`
[INFO] [stderr]   --> src/datatype.rs:65:1
[INFO] [stderr]    |
[INFO] [stderr] 65 | pub fn data_types_float() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `numeric_operations`
[INFO] [stderr]   --> src/datatype.rs:75:1
[INFO] [stderr]    |
[INFO] [stderr] 75 | pub fn numeric_operations() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_boolean`
[INFO] [stderr]   --> src/datatype.rs:94:1
[INFO] [stderr]    |
[INFO] [stderr] 94 | pub fn data_types_boolean() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_char`
[INFO] [stderr]    --> src/datatype.rs:102:1
[INFO] [stderr]     |
[INFO] [stderr] 102 | pub fn data_types_char() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compound_types`
[INFO] [stderr]    --> src/datatype.rs:119:1
[INFO] [stderr]     |
[INFO] [stderr] 119 | pub fn compound_types() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `GLOBAL_VALUE`
[INFO] [stderr]    --> src/datatype.rs:157:1
[INFO] [stderr]     |
[INFO] [stderr] 157 | const GLOBAL_VALUE: &str = "發大財";
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `CHANGABLE_GLOBAL_VALUE`
[INFO] [stderr]    --> src/datatype.rs:158:1
[INFO] [stderr]     |
[INFO] [stderr] 158 | static CHANGABLE_GLOBAL_VALUE: f64 = 10.5;
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuple_with_mixed_data_type`
[INFO] [stderr]    --> src/datatype.rs:160:1
[INFO] [stderr]     |
[INFO] [stderr] 160 | pub fn tuple_with_mixed_data_type() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hello_world`
[INFO] [stderr]  --> src/my_functions.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn hello_world() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fn_with_parameters`
[INFO] [stderr]  --> src/my_functions.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn fn_with_parameters(x: i32, y: i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expression_based`
[INFO] [stderr]   --> src/my_functions.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn expression_based() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `statement_test`
[INFO] [stderr]   --> src/my_functions.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn statement_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]   --> src/my_functions.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub fn add(x: i32, y: i32) -> i32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_fn`
[INFO] [stderr]   --> src/my_functions.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn private_fn(x: i32, y: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mul_condition`
[INFO] [stderr]  --> src/control_flow.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn mul_condition(number: i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_match`
[INFO] [stderr]   --> src/control_flow.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn use_match(number: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_if_expression`
[INFO] [stderr]   --> src/control_flow.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | pub fn use_if_expression() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_to_100`
[INFO] [stderr]   --> src/control_flow.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn add_to_100() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loop_result`
[INFO] [stderr]   --> src/control_flow.rs:48:1
[INFO] [stderr]    |
[INFO] [stderr] 48 | pub fn loop_result() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reduce_to_0`
[INFO] [stderr]   --> src/control_flow.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | pub fn reduce_to_0() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `for_in_array`
[INFO] [stderr]   --> src/control_flow.rs:70:1
[INFO] [stderr]    |
[INFO] [stderr] 70 | pub fn for_in_array() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_vs_copy`
[INFO] [stderr]  --> src/ownership.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn move_vs_copy() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `double_free_error`
[INFO] [stderr]   --> src/ownership.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `to_fixed_double_free_error`
[INFO] [stderr]   --> src/ownership.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn to_fixed_double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `without_double_free_error`
[INFO] [stderr]   --> src/ownership.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn without_double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership_and_functions`
[INFO] [stderr]   --> src/ownership.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn ownership_and_functions() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/ownership.rs:63:1
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn takes_ownership(some_string: String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `makes_copy`
[INFO] [stderr]   --> src/ownership.rs:67:1
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn makes_copy(some_integer: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership_and_return_values`
[INFO] [stderr]   --> src/ownership.rs:71:1
[INFO] [stderr]    |
[INFO] [stderr] 71 | pub fn ownership_and_return_values() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gives_ownership`
[INFO] [stderr]   --> src/ownership.rs:88:1
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn gives_ownership() -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_and_gives_back`
[INFO] [stderr]    --> src/ownership.rs:101:1
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]    --> src/ownership.rs:109:1
[INFO] [stderr]     |
[INFO] [stderr] 109 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]  --> src/references.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn calculate_length(s: &String) -> usize { // s is a reference to a String
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `changeable`
[INFO] [stderr]   --> src/references.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn changeable(some_string: &mut String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_work`
[INFO] [stderr]   --> src/references.rs:54:1
[INFO] [stderr]    |
[INFO] [stderr] 54 | pub fn this_work() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_still_work`
[INFO] [stderr]   --> src/references.rs:67:1
[INFO] [stderr]    |
[INFO] [stderr] 67 | pub fn this_still_work() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_work_too`
[INFO] [stderr]   --> src/references.rs:77:1
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn this_work_too() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `no_dangling_references`
[INFO] [stderr]   --> src/references.rs:94:1
[INFO] [stderr]    |
[INFO] [stderr] 94 | pub fn no_dangling_references() -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]  --> src/slice_type.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn first_word(s: &String) -> usize {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word_enhance`
[INFO] [stderr]   --> src/slice_type.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub fn first_word_enhance(s: &String) -> &str {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.21s
[INFO] running `"docker" "inspect" "d641439f6b825cd64d425460d4db721f982812e5f5a1da04255f26573f923bda"`
[INFO] running `"docker" "rm" "-f" "d641439f6b825cd64d425460d4db721f982812e5f5a1da04255f26573f923bda"`
[INFO] [stdout] d641439f6b825cd64d425460d4db721f982812e5f5a1da04255f26573f923bda
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 837e36e001d199d3a3b4ab5614d3e7330937f5e64b9f4d44213aa71d6fa89330
[INFO] running `"docker" "start" "-a" "837e36e001d199d3a3b4ab5614d3e7330937f5e64b9f4d44213aa71d6fa89330"`
[INFO] [stderr]    Compiling rust_hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/datatype.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/datatype.rs:48:7
[INFO] [stderr]    |
[INFO] [stderr] 48 |   let y: i64 = 30; 
[INFO] [stderr]    |       ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/datatype.rs:123:8
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |        ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]    --> src/datatype.rs:123:14
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |              ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/datatype.rs:145:7
[INFO] [stderr]     |
[INFO] [stderr] 145 |   let a: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]  --> src/ownership.rs:3:7
[INFO] [stderr]   |
[INFO] [stderr] 3 |   let y = x;
[INFO] [stderr]   |       ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]  --> src/ownership.rs:6:7
[INFO] [stderr]   |
[INFO] [stderr] 6 |   let s2 = s1;
[INFO] [stderr]   |       ^^ help: consider prefixing with an underscore: `_s2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]   --> src/ownership.rs:72:7
[INFO] [stderr]    |
[INFO] [stderr] 72 |   let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_s1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/references.rs:81:11
[INFO] [stderr]    |
[INFO] [stderr] 81 |       let r1 = &mut s;
[INFO] [stderr]    |           ^^ help: consider prefixing with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]   --> src/references.rs:85:7
[INFO] [stderr]    |
[INFO] [stderr] 85 |   let r2 = &mut s;
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_number`
[INFO] [stderr]  --> src/guess.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn guess_number() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutable`
[INFO] [stderr]   --> src/datatype.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn mutable() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `variables_shadowing`
[INFO] [stderr]   --> src/datatype.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn variables_shadowing() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types`
[INFO] [stderr]   --> src/datatype.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | pub fn data_types() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_integer`
[INFO] [stderr]   --> src/datatype.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn data_types_integer() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_float`
[INFO] [stderr]   --> src/datatype.rs:65:1
[INFO] [stderr]    |
[INFO] [stderr] 65 | pub fn data_types_float() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `numeric_operations`
[INFO] [stderr]   --> src/datatype.rs:75:1
[INFO] [stderr]    |
[INFO] [stderr] 75 | pub fn numeric_operations() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_boolean`
[INFO] [stderr]   --> src/datatype.rs:94:1
[INFO] [stderr]    |
[INFO] [stderr] 94 | pub fn data_types_boolean() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_char`
[INFO] [stderr]    --> src/datatype.rs:102:1
[INFO] [stderr]     |
[INFO] [stderr] 102 | pub fn data_types_char() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compound_types`
[INFO] [stderr]    --> src/datatype.rs:119:1
[INFO] [stderr]     |
[INFO] [stderr] 119 | pub fn compound_types() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `GLOBAL_VALUE`
[INFO] [stderr]    --> src/datatype.rs:157:1
[INFO] [stderr]     |
[INFO] [stderr] 157 | const GLOBAL_VALUE: &str = "發大財";
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `CHANGABLE_GLOBAL_VALUE`
[INFO] [stderr]    --> src/datatype.rs:158:1
[INFO] [stderr]     |
[INFO] [stderr] 158 | static CHANGABLE_GLOBAL_VALUE: f64 = 10.5;
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuple_with_mixed_data_type`
[INFO] [stderr]    --> src/datatype.rs:160:1
[INFO] [stderr]     |
[INFO] [stderr] 160 | pub fn tuple_with_mixed_data_type() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hello_world`
[INFO] [stderr]  --> src/my_functions.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn hello_world() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fn_with_parameters`
[INFO] [stderr]  --> src/my_functions.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn fn_with_parameters(x: i32, y: i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expression_based`
[INFO] [stderr]   --> src/my_functions.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn expression_based() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `statement_test`
[INFO] [stderr]   --> src/my_functions.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn statement_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]   --> src/my_functions.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub fn add(x: i32, y: i32) -> i32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_fn`
[INFO] [stderr]   --> src/my_functions.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn private_fn(x: i32, y: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mul_condition`
[INFO] [stderr]  --> src/control_flow.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn mul_condition(number: i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_match`
[INFO] [stderr]   --> src/control_flow.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn use_match(number: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_if_expression`
[INFO] [stderr]   --> src/control_flow.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | pub fn use_if_expression() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_to_100`
[INFO] [stderr]   --> src/control_flow.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn add_to_100() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loop_result`
[INFO] [stderr]   --> src/control_flow.rs:48:1
[INFO] [stderr]    |
[INFO] [stderr] 48 | pub fn loop_result() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reduce_to_0`
[INFO] [stderr]   --> src/control_flow.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | pub fn reduce_to_0() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `for_in_array`
[INFO] [stderr]   --> src/control_flow.rs:70:1
[INFO] [stderr]    |
[INFO] [stderr] 70 | pub fn for_in_array() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_vs_copy`
[INFO] [stderr]  --> src/ownership.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn move_vs_copy() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `double_free_error`
[INFO] [stderr]   --> src/ownership.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `to_fixed_double_free_error`
[INFO] [stderr]   --> src/ownership.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn to_fixed_double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `without_double_free_error`
[INFO] [stderr]   --> src/ownership.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn without_double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership_and_functions`
[INFO] [stderr]   --> src/ownership.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn ownership_and_functions() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/ownership.rs:63:1
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn takes_ownership(some_string: String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `makes_copy`
[INFO] [stderr]   --> src/ownership.rs:67:1
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn makes_copy(some_integer: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership_and_return_values`
[INFO] [stderr]   --> src/ownership.rs:71:1
[INFO] [stderr]    |
[INFO] [stderr] 71 | pub fn ownership_and_return_values() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gives_ownership`
[INFO] [stderr]   --> src/ownership.rs:88:1
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn gives_ownership() -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_and_gives_back`
[INFO] [stderr]    --> src/ownership.rs:101:1
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]    --> src/ownership.rs:109:1
[INFO] [stderr]     |
[INFO] [stderr] 109 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]  --> src/references.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn calculate_length(s: &String) -> usize { // s is a reference to a String
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `changeable`
[INFO] [stderr]   --> src/references.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn changeable(some_string: &mut String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_work`
[INFO] [stderr]   --> src/references.rs:54:1
[INFO] [stderr]    |
[INFO] [stderr] 54 | pub fn this_work() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_still_work`
[INFO] [stderr]   --> src/references.rs:67:1
[INFO] [stderr]    |
[INFO] [stderr] 67 | pub fn this_still_work() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_work_too`
[INFO] [stderr]   --> src/references.rs:77:1
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn this_work_too() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `no_dangling_references`
[INFO] [stderr]   --> src/references.rs:94:1
[INFO] [stderr]    |
[INFO] [stderr] 94 | pub fn no_dangling_references() -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]  --> src/slice_type.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn first_word(s: &String) -> usize {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word_enhance`
[INFO] [stderr]   --> src/slice_type.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub fn first_word_enhance(s: &String) -> &str {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `"docker" "inspect" "837e36e001d199d3a3b4ab5614d3e7330937f5e64b9f4d44213aa71d6fa89330"`
[INFO] running `"docker" "rm" "-f" "837e36e001d199d3a3b4ab5614d3e7330937f5e64b9f4d44213aa71d6fa89330"`
[INFO] [stdout] 837e36e001d199d3a3b4ab5614d3e7330937f5e64b9f4d44213aa71d6fa89330
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen"`
[INFO] [stdout] 53485b12d5cc18483a38e63573277fbe11f7537aaef4f8c0fbe21c9c7ade6864
[INFO] running `"docker" "start" "-a" "53485b12d5cc18483a38e63573277fbe11f7537aaef4f8c0fbe21c9c7ade6864"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_hello_world-3ef313b9b0798cdf
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "53485b12d5cc18483a38e63573277fbe11f7537aaef4f8c0fbe21c9c7ade6864"`
[INFO] running `"docker" "rm" "-f" "53485b12d5cc18483a38e63573277fbe11f7537aaef4f8c0fbe21c9c7ade6864"`
[INFO] [stdout] 53485b12d5cc18483a38e63573277fbe11f7537aaef4f8c0fbe21c9c7ade6864