[INFO] cloning repository https://github.com/LImoritakeU/rust_playgroud
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LImoritakeU/rust_playgroud" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLImoritakeU%2Frust_playgroud"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLImoritakeU%2Frust_playgroud'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 28adbc8277ad94b65997893f8a4d6a0a72a0edf1
[INFO] testing LImoritakeU/rust_playgroud against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLImoritakeU%2Frust_playgroud" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LImoritakeU/rust_playgroud on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/LImoritakeU/rust_playgroud
[INFO] finished tweaking git repo https://github.com/LImoritakeU/rust_playgroud
[INFO] tweaked toml for git repo https://github.com/LImoritakeU/rust_playgroud written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/LImoritakeU/rust_playgroud already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4d0d620f427fdf5586bfe3184ec6f341c0fdb984d21bc943ff6a346c7ba6d748
[INFO] running `"docker" "start" "-a" "4d0d620f427fdf5586bfe3184ec6f341c0fdb984d21bc943ff6a346c7ba6d748"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling regex v1.1.5
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling ucd-util v0.1.3
[INFO] [stderr]    Compiling utf8-ranges v1.0.2
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling regex-syntax v0.6.6
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.3
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling aho-corasick v0.7.3
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::intrinsics::write_bytes`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::intrinsics::write_bytes;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `stdin`
[INFO] [stderr]  --> src/practice_57/practice07.rs:1:28
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io::{self, Write, stdin};
[INFO] [stderr]   |                            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Formatter` is imported redundantly
[INFO] [stderr]    --> src/main.rs:127:26
[INFO] [stderr]     |
[INFO] [stderr] 8   | use std::fmt::{Display, Formatter};
[INFO] [stderr]     |                         --------- the item `Formatter` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 127 |     use std::fmt::{self, Formatter, Display};
[INFO] [stderr]     |                          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Display` is imported redundantly
[INFO] [stderr]    --> src/main.rs:127:37
[INFO] [stderr]     |
[INFO] [stderr] 8   | use std::fmt::{Display, Formatter};
[INFO] [stderr]     |                ------- the item `Display` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 127 |     use std::fmt::{self, Formatter, Display};
[INFO] [stderr]     |                                     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/main.rs:180:5
[INFO] [stderr]     |
[INFO] [stderr] 180 |     /// Array, Vector, and Slice
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 181 |     // new array
[INFO] [stderr] 182 |     let arr = ["eins", "zwei"];
[INFO] [stderr]     |     --------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Work::*`
[INFO] [stderr]    --> src/main.rs:312:9
[INFO] [stderr]     |
[INFO] [stderr] 312 |     use Work::*;
[INFO] [stderr]     |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `From` is imported redundantly
[INFO] [stderr]    --> src/main.rs:340:9
[INFO] [stderr]     |
[INFO] [stderr] 340 |     use std::convert::From;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `ToString` is imported redundantly
[INFO] [stderr]    --> src/main.rs:361:9
[INFO] [stderr]     |
[INFO] [stderr] 361 |     use std::string::ToString;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:238:9
[INFO] [stderr]     |
[INFO] [stderr] 238 |     let slice_arr = &_s;
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:241:9
[INFO] [stderr]     |
[INFO] [stderr] 241 |     let slice_arr = &[1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:243:9
[INFO] [stderr]     |
[INFO] [stderr] 243 |     let slice_arr = &mut [1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `decimal_f64`
[INFO] [stderr]    --> src/main.rs:332:9
[INFO] [stderr]     |
[INFO] [stderr] 332 |     let decimal_f64 = decimal as f64;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_decimal_f64`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `my_string`
[INFO] [stderr]    --> src/main.rs:338:9
[INFO] [stderr]     |
[INFO] [stderr] 338 |     let my_string = String::from(my_str);
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `parsed_int`
[INFO] [stderr]    --> src/main.rs:376:9
[INFO] [stderr]     |
[INFO] [stderr] 376 |     let parsed_int: i32 = "5".parse().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parsed_int`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `turbo_parsed`
[INFO] [stderr]    --> src/main.rs:377:9
[INFO] [stderr]     |
[INFO] [stderr] 377 |     let turbo_parsed = "10".parse::<i32>().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_turbo_parsed`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `float_parsed`
[INFO] [stderr]    --> src/main.rs:378:9
[INFO] [stderr]     |
[INFO] [stderr] 378 |     let float_parsed = "10".parse::<f64>().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_float_parsed`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `letter`
[INFO] [stderr]    --> src/main.rs:434:9
[INFO] [stderr]     |
[INFO] [stderr] 434 |     let letter: Option<i32> = None;
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_letter`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `emoticon`
[INFO] [stderr]    --> src/main.rs:435:9
[INFO] [stderr]     |
[INFO] [stderr] 435 |     let emoticon: Option<i32> = None;
[INFO] [stderr]     |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_emoticon`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s_meter`
[INFO] [stderr]   --> src/practice_57/practice07.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let s_meter = length as f64 * 0.3048 * width as f64 * 0.3048;
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_meter`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/practice_57/practice03.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let mut sentence = &[person, " says, \"", quote, "\""].concat();
[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/practice_57/practice05.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut num1: i32;
[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/practice_57/practice05.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let mut num2: i32;
[INFO] [stderr]   |         ----^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `count_str`
[INFO] [stderr]   --> src/practice_57/practice02.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn count_str() {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_quote`
[INFO] [stderr]  --> src/practice_57/practice03.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn use_quote() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fill_sentence`
[INFO] [stderr]  --> src/practice_57/practice04.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn fill_sentence() {}
[INFO] [stderr]   |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate`
[INFO] [stderr]  --> src/practice_57/practice05.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn calculate() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_retiration`
[INFO] [stderr]  --> src/practice_57/practice06.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn calculate_retiration() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `rectangle`
[INFO] [stderr]  --> src/practice_57/practice07.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn rectangle() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `bubble_sort`
[INFO] [stderr]   --> src/main.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn bubble_sort(slice: &mut Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `num`
[INFO] [stderr]   --> src/main.rs:60:4
[INFO] [stderr]    |
[INFO] [stderr] 60 | fn num() {
[INFO] [stderr]    |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `debug_practice`
[INFO] [stderr]   --> src/main.rs:93:4
[INFO] [stderr]    |
[INFO] [stderr] 93 | fn debug_practice() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `display_practice`
[INFO] [stderr]    --> src/main.rs:108:4
[INFO] [stderr]     |
[INFO] [stderr] 108 | fn display_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `formatting`
[INFO] [stderr]    --> src/main.rs:126:4
[INFO] [stderr]     |
[INFO] [stderr] 126 | fn formatting() {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuple_practice`
[INFO] [stderr]    --> src/main.rs:149:4
[INFO] [stderr]     |
[INFO] [stderr] 149 | fn tuple_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sequences`
[INFO] [stderr]    --> src/main.rs:179:4
[INFO] [stderr]     |
[INFO] [stderr] 179 | fn sequences() {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `enums_practices`
[INFO] [stderr]    --> src/main.rs:268:4
[INFO] [stderr]     |
[INFO] [stderr] 268 | fn enums_practices() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `conversion_practice`
[INFO] [stderr]    --> src/main.rs:323:4
[INFO] [stderr]     |
[INFO] [stderr] 323 | fn conversion_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `lambda_practice`
[INFO] [stderr]    --> src/main.rs:394:4
[INFO] [stderr]     |
[INFO] [stderr] 394 | fn lambda_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `assign_practice`
[INFO] [stderr]    --> src/main.rs:432:4
[INFO] [stderr]     |
[INFO] [stderr] 432 | fn assign_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `trans` should have an upper case name
[INFO] [stderr]  --> src/practice_57/practice07.rs:7:11
[INFO] [stderr]   |
[INFO] [stderr] 7 |     const trans: f64 = 0.09290304;
[INFO] [stderr]   |           ^^^^^ help: convert the identifier to upper case: `TRANS`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant `pieces_per_pizza` should have an upper case name
[INFO] [stderr]  --> src/practice_57/practice08.rs:6:11
[INFO] [stderr]   |
[INFO] [stderr] 6 |     const pieces_per_pizza: i32 = 8;
[INFO] [stderr]   |           ^^^^^^^^^^^^^^^^ help: convert the identifier to upper case: `PIECES_PER_PIZZA`
[INFO] [stderr] 
[INFO] [stderr] warning: 41 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 33.31s
[INFO] running `"docker" "inspect" "4d0d620f427fdf5586bfe3184ec6f341c0fdb984d21bc943ff6a346c7ba6d748"`
[INFO] running `"docker" "rm" "-f" "4d0d620f427fdf5586bfe3184ec6f341c0fdb984d21bc943ff6a346c7ba6d748"`
[INFO] [stdout] 4d0d620f427fdf5586bfe3184ec6f341c0fdb984d21bc943ff6a346c7ba6d748
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8a942f848096c286ad7c2b32e7b2f0cb4eba851fb65260570eb7d2fd9d7bbf67
[INFO] running `"docker" "start" "-a" "8a942f848096c286ad7c2b32e7b2f0cb4eba851fb65260570eb7d2fd9d7bbf67"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::intrinsics::write_bytes`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::intrinsics::write_bytes;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `stdin`
[INFO] [stderr]  --> src/practice_57/practice07.rs:1:28
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io::{self, Write, stdin};
[INFO] [stderr]   |                            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Formatter` is imported redundantly
[INFO] [stderr]    --> src/main.rs:127:26
[INFO] [stderr]     |
[INFO] [stderr] 8   | use std::fmt::{Display, Formatter};
[INFO] [stderr]     |                         --------- the item `Formatter` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 127 |     use std::fmt::{self, Formatter, Display};
[INFO] [stderr]     |                          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Display` is imported redundantly
[INFO] [stderr]    --> src/main.rs:127:37
[INFO] [stderr]     |
[INFO] [stderr] 8   | use std::fmt::{Display, Formatter};
[INFO] [stderr]     |                ------- the item `Display` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 127 |     use std::fmt::{self, Formatter, Display};
[INFO] [stderr]     |                                     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/main.rs:180:5
[INFO] [stderr]     |
[INFO] [stderr] 180 |     /// Array, Vector, and Slice
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 181 |     // new array
[INFO] [stderr] 182 |     let arr = ["eins", "zwei"];
[INFO] [stderr]     |     --------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Work::*`
[INFO] [stderr]    --> src/main.rs:312:9
[INFO] [stderr]     |
[INFO] [stderr] 312 |     use Work::*;
[INFO] [stderr]     |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `From` is imported redundantly
[INFO] [stderr]    --> src/main.rs:340:9
[INFO] [stderr]     |
[INFO] [stderr] 340 |     use std::convert::From;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `ToString` is imported redundantly
[INFO] [stderr]    --> src/main.rs:361:9
[INFO] [stderr]     |
[INFO] [stderr] 361 |     use std::string::ToString;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:238:9
[INFO] [stderr]     |
[INFO] [stderr] 238 |     let slice_arr = &_s;
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:241:9
[INFO] [stderr]     |
[INFO] [stderr] 241 |     let slice_arr = &[1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:243:9
[INFO] [stderr]     |
[INFO] [stderr] 243 |     let slice_arr = &mut [1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `decimal_f64`
[INFO] [stderr]    --> src/main.rs:332:9
[INFO] [stderr]     |
[INFO] [stderr] 332 |     let decimal_f64 = decimal as f64;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_decimal_f64`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `my_string`
[INFO] [stderr]    --> src/main.rs:338:9
[INFO] [stderr]     |
[INFO] [stderr] 338 |     let my_string = String::from(my_str);
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `parsed_int`
[INFO] [stderr]    --> src/main.rs:376:9
[INFO] [stderr]     |
[INFO] [stderr] 376 |     let parsed_int: i32 = "5".parse().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parsed_int`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `turbo_parsed`
[INFO] [stderr]    --> src/main.rs:377:9
[INFO] [stderr]     |
[INFO] [stderr] 377 |     let turbo_parsed = "10".parse::<i32>().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_turbo_parsed`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `float_parsed`
[INFO] [stderr]    --> src/main.rs:378:9
[INFO] [stderr]     |
[INFO] [stderr] 378 |     let float_parsed = "10".parse::<f64>().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_float_parsed`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `letter`
[INFO] [stderr]    --> src/main.rs:434:9
[INFO] [stderr]     |
[INFO] [stderr] 434 |     let letter: Option<i32> = None;
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_letter`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `emoticon`
[INFO] [stderr]    --> src/main.rs:435:9
[INFO] [stderr]     |
[INFO] [stderr] 435 |     let emoticon: Option<i32> = None;
[INFO] [stderr]     |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_emoticon`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s_meter`
[INFO] [stderr]   --> src/practice_57/practice07.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let s_meter = length as f64 * 0.3048 * width as f64 * 0.3048;
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_meter`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/practice_57/practice03.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let mut sentence = &[person, " says, \"", quote, "\""].concat();
[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/practice_57/practice05.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut num1: i32;
[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/practice_57/practice05.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let mut num2: i32;
[INFO] [stderr]   |         ----^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `count_str`
[INFO] [stderr]   --> src/practice_57/practice02.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn count_str() {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_quote`
[INFO] [stderr]  --> src/practice_57/practice03.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn use_quote() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fill_sentence`
[INFO] [stderr]  --> src/practice_57/practice04.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn fill_sentence() {}
[INFO] [stderr]   |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate`
[INFO] [stderr]  --> src/practice_57/practice05.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn calculate() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_retiration`
[INFO] [stderr]  --> src/practice_57/practice06.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn calculate_retiration() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `rectangle`
[INFO] [stderr]  --> src/practice_57/practice07.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn rectangle() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `bubble_sort`
[INFO] [stderr]   --> src/main.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn bubble_sort(slice: &mut Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `num`
[INFO] [stderr]   --> src/main.rs:60:4
[INFO] [stderr]    |
[INFO] [stderr] 60 | fn num() {
[INFO] [stderr]    |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `debug_practice`
[INFO] [stderr]   --> src/main.rs:93:4
[INFO] [stderr]    |
[INFO] [stderr] 93 | fn debug_practice() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `display_practice`
[INFO] [stderr]    --> src/main.rs:108:4
[INFO] [stderr]     |
[INFO] [stderr] 108 | fn display_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `formatting`
[INFO] [stderr]    --> src/main.rs:126:4
[INFO] [stderr]     |
[INFO] [stderr] 126 | fn formatting() {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuple_practice`
[INFO] [stderr]    --> src/main.rs:149:4
[INFO] [stderr]     |
[INFO] [stderr] 149 | fn tuple_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sequences`
[INFO] [stderr]    --> src/main.rs:179:4
[INFO] [stderr]     |
[INFO] [stderr] 179 | fn sequences() {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `enums_practices`
[INFO] [stderr]    --> src/main.rs:268:4
[INFO] [stderr]     |
[INFO] [stderr] 268 | fn enums_practices() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `conversion_practice`
[INFO] [stderr]    --> src/main.rs:323:4
[INFO] [stderr]     |
[INFO] [stderr] 323 | fn conversion_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `lambda_practice`
[INFO] [stderr]    --> src/main.rs:394:4
[INFO] [stderr]     |
[INFO] [stderr] 394 | fn lambda_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `assign_practice`
[INFO] [stderr]    --> src/main.rs:432:4
[INFO] [stderr]     |
[INFO] [stderr] 432 | fn assign_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `trans` should have an upper case name
[INFO] [stderr]  --> src/practice_57/practice07.rs:7:11
[INFO] [stderr]   |
[INFO] [stderr] 7 |     const trans: f64 = 0.09290304;
[INFO] [stderr]   |           ^^^^^ help: convert the identifier to upper case: `TRANS`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant `pieces_per_pizza` should have an upper case name
[INFO] [stderr]  --> src/practice_57/practice08.rs:6:11
[INFO] [stderr]   |
[INFO] [stderr] 6 |     const pieces_per_pizza: i32 = 8;
[INFO] [stderr]   |           ^^^^^^^^^^^^^^^^ help: convert the identifier to upper case: `PIECES_PER_PIZZA`
[INFO] [stderr] 
[INFO] [stderr] warning: 41 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `"docker" "inspect" "8a942f848096c286ad7c2b32e7b2f0cb4eba851fb65260570eb7d2fd9d7bbf67"`
[INFO] running `"docker" "rm" "-f" "8a942f848096c286ad7c2b32e7b2f0cb4eba851fb65260570eb7d2fd9d7bbf67"`
[INFO] [stdout] 8a942f848096c286ad7c2b32e7b2f0cb4eba851fb65260570eb7d2fd9d7bbf67
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+beta-2020-06-03" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] df1dce7d4414cf8fe493db26564cc2485a94752af5e4ca78597f1948c1f1ab84
[INFO] running `"docker" "start" "-a" "df1dce7d4414cf8fe493db26564cc2485a94752af5e4ca78597f1948c1f1ab84"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused import: `std::intrinsics::write_bytes`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::intrinsics::write_bytes;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `stdin`
[INFO] [stderr]  --> src/practice_57/practice07.rs:1:28
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io::{self, Write, stdin};
[INFO] [stderr]   |                            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Formatter` is imported redundantly
[INFO] [stderr]    --> src/main.rs:127:26
[INFO] [stderr]     |
[INFO] [stderr] 8   | use std::fmt::{Display, Formatter};
[INFO] [stderr]     |                         --------- the item `Formatter` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 127 |     use std::fmt::{self, Formatter, Display};
[INFO] [stderr]     |                          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Display` is imported redundantly
[INFO] [stderr]    --> src/main.rs:127:37
[INFO] [stderr]     |
[INFO] [stderr] 8   | use std::fmt::{Display, Formatter};
[INFO] [stderr]     |                ------- the item `Display` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 127 |     use std::fmt::{self, Formatter, Display};
[INFO] [stderr]     |                                     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/main.rs:180:5
[INFO] [stderr]     |
[INFO] [stderr] 180 |     /// Array, Vector, and Slice
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 181 |     // new array
[INFO] [stderr] 182 |     let arr = ["eins", "zwei"];
[INFO] [stderr]     |     --------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Work::*`
[INFO] [stderr]    --> src/main.rs:312:9
[INFO] [stderr]     |
[INFO] [stderr] 312 |     use Work::*;
[INFO] [stderr]     |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `From` is imported redundantly
[INFO] [stderr]    --> src/main.rs:340:9
[INFO] [stderr]     |
[INFO] [stderr] 340 |     use std::convert::From;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `ToString` is imported redundantly
[INFO] [stderr]    --> src/main.rs:361:9
[INFO] [stderr]     |
[INFO] [stderr] 361 |     use std::string::ToString;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:238:9
[INFO] [stderr]     |
[INFO] [stderr] 238 |     let slice_arr = &_s;
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:241:9
[INFO] [stderr]     |
[INFO] [stderr] 241 |     let slice_arr = &[1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_arr`
[INFO] [stderr]    --> src/main.rs:243:9
[INFO] [stderr]     |
[INFO] [stderr] 243 |     let slice_arr = &mut [1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_slice_arr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `decimal_f64`
[INFO] [stderr]    --> src/main.rs:332:9
[INFO] [stderr]     |
[INFO] [stderr] 332 |     let decimal_f64 = decimal as f64;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_decimal_f64`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `my_string`
[INFO] [stderr]    --> src/main.rs:338:9
[INFO] [stderr]     |
[INFO] [stderr] 338 |     let my_string = String::from(my_str);
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `parsed_int`
[INFO] [stderr]    --> src/main.rs:376:9
[INFO] [stderr]     |
[INFO] [stderr] 376 |     let parsed_int: i32 = "5".parse().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parsed_int`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `turbo_parsed`
[INFO] [stderr]    --> src/main.rs:377:9
[INFO] [stderr]     |
[INFO] [stderr] 377 |     let turbo_parsed = "10".parse::<i32>().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_turbo_parsed`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `float_parsed`
[INFO] [stderr]    --> src/main.rs:378:9
[INFO] [stderr]     |
[INFO] [stderr] 378 |     let float_parsed = "10".parse::<f64>().unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_float_parsed`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `letter`
[INFO] [stderr]    --> src/main.rs:434:9
[INFO] [stderr]     |
[INFO] [stderr] 434 |     let letter: Option<i32> = None;
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_letter`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `emoticon`
[INFO] [stderr]    --> src/main.rs:435:9
[INFO] [stderr]     |
[INFO] [stderr] 435 |     let emoticon: Option<i32> = None;
[INFO] [stderr]     |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_emoticon`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s_meter`
[INFO] [stderr]   --> src/practice_57/practice07.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let s_meter = length as f64 * 0.3048 * width as f64 * 0.3048;
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_meter`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/practice_57/practice03.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let mut sentence = &[person, " says, \"", quote, "\""].concat();
[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/practice_57/practice05.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut num1: i32;
[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/practice_57/practice05.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let mut num2: i32;
[INFO] [stderr]   |         ----^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `count_str`
[INFO] [stderr]   --> src/practice_57/practice02.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn count_str() {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_quote`
[INFO] [stderr]  --> src/practice_57/practice03.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn use_quote() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fill_sentence`
[INFO] [stderr]  --> src/practice_57/practice04.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn fill_sentence() {}
[INFO] [stderr]   |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate`
[INFO] [stderr]  --> src/practice_57/practice05.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn calculate() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_retiration`
[INFO] [stderr]  --> src/practice_57/practice06.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn calculate_retiration() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `rectangle`
[INFO] [stderr]  --> src/practice_57/practice07.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn rectangle() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `bubble_sort`
[INFO] [stderr]   --> src/main.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn bubble_sort(slice: &mut Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `num`
[INFO] [stderr]   --> src/main.rs:60:4
[INFO] [stderr]    |
[INFO] [stderr] 60 | fn num() {
[INFO] [stderr]    |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `debug_practice`
[INFO] [stderr]   --> src/main.rs:93:4
[INFO] [stderr]    |
[INFO] [stderr] 93 | fn debug_practice() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `display_practice`
[INFO] [stderr]    --> src/main.rs:108:4
[INFO] [stderr]     |
[INFO] [stderr] 108 | fn display_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `formatting`
[INFO] [stderr]    --> src/main.rs:126:4
[INFO] [stderr]     |
[INFO] [stderr] 126 | fn formatting() {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuple_practice`
[INFO] [stderr]    --> src/main.rs:149:4
[INFO] [stderr]     |
[INFO] [stderr] 149 | fn tuple_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sequences`
[INFO] [stderr]    --> src/main.rs:179:4
[INFO] [stderr]     |
[INFO] [stderr] 179 | fn sequences() {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `enums_practices`
[INFO] [stderr]    --> src/main.rs:268:4
[INFO] [stderr]     |
[INFO] [stderr] 268 | fn enums_practices() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `conversion_practice`
[INFO] [stderr]    --> src/main.rs:323:4
[INFO] [stderr]     |
[INFO] [stderr] 323 | fn conversion_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `lambda_practice`
[INFO] [stderr]    --> src/main.rs:394:4
[INFO] [stderr]     |
[INFO] [stderr] 394 | fn lambda_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `assign_practice`
[INFO] [stderr]    --> src/main.rs:432:4
[INFO] [stderr]     |
[INFO] [stderr] 432 | fn assign_practice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `trans` should have an upper case name
[INFO] [stderr]  --> src/practice_57/practice07.rs:7:11
[INFO] [stderr]   |
[INFO] [stderr] 7 |     const trans: f64 = 0.09290304;
[INFO] [stderr]   |           ^^^^^ help: convert the identifier to upper case: `TRANS`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant `pieces_per_pizza` should have an upper case name
[INFO] [stderr]  --> src/practice_57/practice08.rs:6:11
[INFO] [stderr]   |
[INFO] [stderr] 6 |     const pieces_per_pizza: i32 = 8;
[INFO] [stderr]   |           ^^^^^^^^^^^^^^^^ help: convert the identifier to upper case: `PIECES_PER_PIZZA`
[INFO] [stderr] 
[INFO] [stderr] warning: 41 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/playground-c05bf2c77b2bfee7
[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" "df1dce7d4414cf8fe493db26564cc2485a94752af5e4ca78597f1948c1f1ab84"`
[INFO] running `"docker" "rm" "-f" "df1dce7d4414cf8fe493db26564cc2485a94752af5e4ca78597f1948c1f1ab84"`
[INFO] [stdout] df1dce7d4414cf8fe493db26564cc2485a94752af5e4ca78597f1948c1f1ab84