[INFO] cloning repository https://github.com/Aditya925/Book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Aditya925/Book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAditya925%2FBook", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAditya925%2FBook'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bcf17ac2313bbb134e76cb0238c33f519484a06c
[INFO] testing Aditya925/Book against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAditya925%2FBook" "/workspace/builds/worker-28/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-28/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Aditya925/Book on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Aditya925/Book
[INFO] finished tweaking git repo https://github.com/Aditya925/Book
[INFO] tweaked toml for git repo https://github.com/Aditya925/Book written to /workspace/builds/worker-28/source/Cargo.toml
[INFO] crate git repo https://github.com/Aditya925/Book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d59d17bd5fc816bb63d986e4784c334f1b1b8c1b8d68313a87ce0fc0d63c7ce6
[INFO] running `Command { std: "docker" "start" "-a" "d59d17bd5fc816bb63d986e4784c334f1b1b8c1b8d68313a87ce0fc0d63c7ce6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d59d17bd5fc816bb63d986e4784c334f1b1b8c1b8d68313a87ce0fc0d63c7ce6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d59d17bd5fc816bb63d986e4784c334f1b1b8c1b8d68313a87ce0fc0d63c7ce6", kill_on_drop: false }`
[INFO] [stdout] d59d17bd5fc816bb63d986e4784c334f1b1b8c1b8d68313a87ce0fc0d63c7ce6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 894c4a76f1c1477414918789b7312afbec4418d3810d73950a5c508fee523a06
[INFO] running `Command { std: "docker" "start" "-a" "894c4a76f1c1477414918789b7312afbec4418d3810d73950a5c508fee523a06", kill_on_drop: false }`
[INFO] [stderr]    Compiling book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `age` is never read
[INFO] [stdout]   --> src/basics.rs:38:13
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let mut age = 22;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/structs.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut user2 = User{
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `temp`
[INFO] [stdout]  --> src/temp.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn temp() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fib`
[INFO] [stdout]  --> src/fibo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn fib (n: i32) -> i32 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/christmas.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `LY`
[INFO] [stdout]   --> src/christmas.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | / const LY: [&str; 12] = [
[INFO] [stdout] 14 | |     "a partridge in a pear tree",
[INFO] [stdout] 15 | |     "two turtle doves",
[INFO] [stdout] 16 | |     "three French hens",
[INFO] [stdout] ...  |
[INFO] [stdout] 25 | |     "twelve drummers drumming",
[INFO] [stdout] 26 | | ];
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `PO`
[INFO] [stdout]   --> src/christmas.rs:27:1
[INFO] [stdout]    |
[INFO] [stdout] 27 | / const PO: [&str; 12] = [
[INFO] [stdout] 28 | |         "first",
[INFO] [stdout] 29 | |         "second",
[INFO] [stdout] 30 | |         "third",
[INFO] [stdout] ...  |
[INFO] [stdout] 39 | |         "twelfth",
[INFO] [stdout] 40 | | ];
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Day`
[INFO] [stdout]   --> src/christmas.rs:41:1
[INFO] [stdout]    |
[INFO] [stdout] 41 | type Day = u8;
[INFO] [stdout]    | ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_first_line`
[INFO] [stdout]   --> src/christmas.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn print_first_line(day: Day) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_lyrics`
[INFO] [stdout]   --> src/christmas.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn print_lyrics(day: Day) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `capitalize`
[INFO] [stdout]   --> src/christmas.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn capitalize(text: &str) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutability`
[INFO] [stdout]  --> src/basics.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn mutability(){
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shadowing`
[INFO] [stdout]   --> src/basics.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn shadowing(){
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `var`
[INFO] [stdout]   --> src/basics.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub fn var(){
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `var1`
[INFO] [stdout]   --> src/basics.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn var1(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `constant`
[INFO] [stdout]   --> src/basics.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn constant(){
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `arrays`
[INFO] [stdout]   --> src/basics.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub fn arrays(){
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuples`
[INFO] [stdout]   --> src/basics.rs:92:8
[INFO] [stdout]    |
[INFO] [stdout] 92 | pub fn tuples(){
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `input`
[INFO] [stdout]    --> src/basics.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 | pub fn input(){
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `conditionals`
[INFO] [stdout]    --> src/basics.rs:111:8
[INFO] [stdout]     |
[INFO] [stdout] 111 | pub fn conditionals(){
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `functions`
[INFO] [stdout]    --> src/basics.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 | pub fn functions(){
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `greeting`
[INFO] [stdout]    --> src/basics.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn greeting(greet:&str , name:&str){
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add`
[INFO] [stdout]    --> src/basics.rs:149:4
[INFO] [stdout]     |
[INFO] [stdout] 149 | fn add(n1:i32,n2:i32) -> i32 {     // this sign (->) is used to return that datatype
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loops`
[INFO] [stdout]  --> src/loops.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn loops(){
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_1`
[INFO] [stdout]  --> src/loops.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn loop_1(){
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `whileloop`
[INFO] [stdout]   --> src/loops.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn whileloop(){
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `forloop`
[INFO] [stdout]   --> src/loops.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn forloop(){
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/structs.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User{
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `structs_rust`
[INFO] [stdout]  --> src/structs.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn structs_rust(){
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `vectors_rust`
[INFO] [stdout]  --> src/vectors.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn vectors_rust(){
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.00s
[INFO] running `Command { std: "docker" "inspect" "894c4a76f1c1477414918789b7312afbec4418d3810d73950a5c508fee523a06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "894c4a76f1c1477414918789b7312afbec4418d3810d73950a5c508fee523a06", kill_on_drop: false }`
[INFO] [stdout] 894c4a76f1c1477414918789b7312afbec4418d3810d73950a5c508fee523a06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3fd2b089085563ffc352ba2b17d820effd1fab35bf9bc8b7a0b7449adfed7a7c
[INFO] running `Command { std: "docker" "start" "-a" "3fd2b089085563ffc352ba2b17d820effd1fab35bf9bc8b7a0b7449adfed7a7c", kill_on_drop: false }`
[INFO] [stderr]    Compiling book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `age` is never read
[INFO] [stdout]   --> src/basics.rs:38:13
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let mut age = 22;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/structs.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut user2 = User{
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `temp`
[INFO] [stdout]  --> src/temp.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn temp() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fib`
[INFO] [stdout]  --> src/fibo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn fib (n: i32) -> i32 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/christmas.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `LY`
[INFO] [stdout]   --> src/christmas.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | / const LY: [&str; 12] = [
[INFO] [stdout] 14 | |     "a partridge in a pear tree",
[INFO] [stdout] 15 | |     "two turtle doves",
[INFO] [stdout] 16 | |     "three French hens",
[INFO] [stdout] ...  |
[INFO] [stdout] 25 | |     "twelve drummers drumming",
[INFO] [stdout] 26 | | ];
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `PO`
[INFO] [stdout]   --> src/christmas.rs:27:1
[INFO] [stdout]    |
[INFO] [stdout] 27 | / const PO: [&str; 12] = [
[INFO] [stdout] 28 | |         "first",
[INFO] [stdout] 29 | |         "second",
[INFO] [stdout] 30 | |         "third",
[INFO] [stdout] ...  |
[INFO] [stdout] 39 | |         "twelfth",
[INFO] [stdout] 40 | | ];
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Day`
[INFO] [stdout]   --> src/christmas.rs:41:1
[INFO] [stdout]    |
[INFO] [stdout] 41 | type Day = u8;
[INFO] [stdout]    | ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_first_line`
[INFO] [stdout]   --> src/christmas.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn print_first_line(day: Day) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_lyrics`
[INFO] [stdout]   --> src/christmas.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn print_lyrics(day: Day) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `capitalize`
[INFO] [stdout]   --> src/christmas.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn capitalize(text: &str) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutability`
[INFO] [stdout]  --> src/basics.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn mutability(){
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shadowing`
[INFO] [stdout]   --> src/basics.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn shadowing(){
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `var`
[INFO] [stdout]   --> src/basics.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub fn var(){
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `var1`
[INFO] [stdout]   --> src/basics.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn var1(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `constant`
[INFO] [stdout]   --> src/basics.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn constant(){
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `arrays`
[INFO] [stdout]   --> src/basics.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub fn arrays(){
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuples`
[INFO] [stdout]   --> src/basics.rs:92:8
[INFO] [stdout]    |
[INFO] [stdout] 92 | pub fn tuples(){
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `input`
[INFO] [stdout]    --> src/basics.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 | pub fn input(){
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `conditionals`
[INFO] [stdout]    --> src/basics.rs:111:8
[INFO] [stdout]     |
[INFO] [stdout] 111 | pub fn conditionals(){
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `functions`
[INFO] [stdout]    --> src/basics.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 | pub fn functions(){
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `greeting`
[INFO] [stdout]    --> src/basics.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn greeting(greet:&str , name:&str){
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add`
[INFO] [stdout]    --> src/basics.rs:149:4
[INFO] [stdout]     |
[INFO] [stdout] 149 | fn add(n1:i32,n2:i32) -> i32 {     // this sign (->) is used to return that datatype
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loops`
[INFO] [stdout]  --> src/loops.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn loops(){
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_1`
[INFO] [stdout]  --> src/loops.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn loop_1(){
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `whileloop`
[INFO] [stdout]   --> src/loops.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn whileloop(){
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `forloop`
[INFO] [stdout]   --> src/loops.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn forloop(){
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/structs.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User{
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `structs_rust`
[INFO] [stdout]  --> src/structs.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn structs_rust(){
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `vectors_rust`
[INFO] [stdout]  --> src/vectors.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn vectors_rust(){
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.37s
[INFO] running `Command { std: "docker" "inspect" "3fd2b089085563ffc352ba2b17d820effd1fab35bf9bc8b7a0b7449adfed7a7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fd2b089085563ffc352ba2b17d820effd1fab35bf9bc8b7a0b7449adfed7a7c", kill_on_drop: false }`
[INFO] [stdout] 3fd2b089085563ffc352ba2b17d820effd1fab35bf9bc8b7a0b7449adfed7a7c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 0035c08fe982aad28ead956dd7de3f5f6d1c7badf8db23b41cab2f08dc1ad377
[INFO] running `Command { std: "docker" "start" "-a" "0035c08fe982aad28ead956dd7de3f5f6d1c7badf8db23b41cab2f08dc1ad377", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `age` is never read
[INFO] [stderr]   --> src/basics.rs:38:13
[INFO] [stderr]    |
[INFO] [stderr] 38 |     let mut age = 22;
[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: variable does not need to be mutable
[INFO] [stderr]   --> src/structs.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let mut user2 = User{
[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: function is never used: `temp`
[INFO] [stderr]  --> src/temp.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn temp() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fib`
[INFO] [stderr]  --> src/fibo.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn fib (n: i32) -> i32 {
[INFO] [stderr]   |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]  --> src/christmas.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn run() {
[INFO] [stderr]   |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `LY`
[INFO] [stderr]   --> src/christmas.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | / const LY: [&str; 12] = [
[INFO] [stderr] 14 | |     "a partridge in a pear tree",
[INFO] [stderr] 15 | |     "two turtle doves",
[INFO] [stderr] 16 | |     "three French hens",
[INFO] [stderr] ...  |
[INFO] [stderr] 25 | |     "twelve drummers drumming",
[INFO] [stderr] 26 | | ];
[INFO] [stderr]    | |__^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `PO`
[INFO] [stderr]   --> src/christmas.rs:27:1
[INFO] [stderr]    |
[INFO] [stderr] 27 | / const PO: [&str; 12] = [
[INFO] [stderr] 28 | |         "first",
[INFO] [stderr] 29 | |         "second",
[INFO] [stderr] 30 | |         "third",
[INFO] [stderr] ...  |
[INFO] [stderr] 39 | |         "twelfth",
[INFO] [stderr] 40 | | ];
[INFO] [stderr]    | |__^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Day`
[INFO] [stderr]   --> src/christmas.rs:41:1
[INFO] [stderr]    |
[INFO] [stderr] 41 | type Day = u8;
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_first_line`
[INFO] [stderr]   --> src/christmas.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn print_first_line(day: Day) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_lyrics`
[INFO] [stderr]   --> src/christmas.rs:49:4
[INFO] [stderr]    |
[INFO] [stderr] 49 | fn print_lyrics(day: Day) {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `capitalize`
[INFO] [stderr]   --> src/christmas.rs:59:4
[INFO] [stderr]    |
[INFO] [stderr] 59 | fn capitalize(text: &str) -> String {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutability`
[INFO] [stderr]  --> src/basics.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn mutability(){
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `shadowing`
[INFO] [stderr]   --> src/basics.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn shadowing(){
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `var`
[INFO] [stderr]   --> src/basics.rs:27:8
[INFO] [stderr]    |
[INFO] [stderr] 27 | pub fn var(){
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `var1`
[INFO] [stderr]   --> src/basics.rs:36:8
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn var1(){
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `constant`
[INFO] [stderr]   --> src/basics.rs:47:8
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn constant(){
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `arrays`
[INFO] [stderr]   --> src/basics.rs:53:8
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn arrays(){
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuples`
[INFO] [stderr]   --> src/basics.rs:92:8
[INFO] [stderr]    |
[INFO] [stderr] 92 | pub fn tuples(){
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `input`
[INFO] [stderr]    --> src/basics.rs:103:8
[INFO] [stderr]     |
[INFO] [stderr] 103 | pub fn input(){
[INFO] [stderr]     |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `conditionals`
[INFO] [stderr]    --> src/basics.rs:111:8
[INFO] [stderr]     |
[INFO] [stderr] 111 | pub fn conditionals(){
[INFO] [stderr]     |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `functions`
[INFO] [stderr]    --> src/basics.rs:140:8
[INFO] [stderr]     |
[INFO] [stderr] 140 | pub fn functions(){
[INFO] [stderr]     |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `greeting`
[INFO] [stderr]    --> src/basics.rs:146:4
[INFO] [stderr]     |
[INFO] [stderr] 146 | fn greeting(greet:&str , name:&str){
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]    --> src/basics.rs:149:4
[INFO] [stderr]     |
[INFO] [stderr] 149 | fn add(n1:i32,n2:i32) -> i32 {     // this sign (->) is used to return that datatype
[INFO] [stderr]     |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loops`
[INFO] [stderr]  --> src/loops.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn loops(){
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loop_1`
[INFO] [stderr]  --> src/loops.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn loop_1(){
[INFO] [stderr]   |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `whileloop`
[INFO] [stderr]   --> src/loops.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn whileloop(){
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `forloop`
[INFO] [stderr]   --> src/loops.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn forloop(){
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `User`
[INFO] [stderr]  --> src/structs.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct User{
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `structs_rust`
[INFO] [stderr]  --> src/structs.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn structs_rust(){
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `vectors_rust`
[INFO] [stderr]  --> src/vectors.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn vectors_rust(){
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `book` (bin "book" test) generated 31 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/book-f18564bfaef54014)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0035c08fe982aad28ead956dd7de3f5f6d1c7badf8db23b41cab2f08dc1ad377", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0035c08fe982aad28ead956dd7de3f5f6d1c7badf8db23b41cab2f08dc1ad377", kill_on_drop: false }`
[INFO] [stdout] 0035c08fe982aad28ead956dd7de3f5f6d1c7badf8db23b41cab2f08dc1ad377