[INFO] updating cached repository https://github.com/TheLudlows/rust-tour
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/TheLudlows/rust-tour
[INFO] [stderr]    9dee371..de4ce05  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] de4ce051e16b54615fa48d8230be65b10d384ac8
[INFO] checking TheLudlows/rust-tour against try#8a749131e7beb72f6edacefd2bdcbed3d67b2112 for pr-72331
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTheLudlows%2Frust-tour" "/workspace/builds/worker-11/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TheLudlows/rust-tour on toolchain 8a749131e7beb72f6edacefd2bdcbed3d67b2112
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/TheLudlows/rust-tour
[INFO] finished tweaking git repo https://github.com/TheLudlows/rust-tour
[INFO] tweaked toml for git repo https://github.com/TheLudlows/rust-tour written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/TheLudlows/rust-tour already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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=forbid" "-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" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f09cc1b159d3428385c54695d2f7fa0709d4b8139c708218c19154b1e9c62041
[INFO] running `"docker" "start" "-a" "f09cc1b159d3428385c54695d2f7fa0709d4b8139c708218c19154b1e9c62041"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking rust-tour v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::fmt::format`
[INFO] [stderr]  --> src/traits.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fmt::format;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `person` should have an upper camel case name
[INFO] [stderr]  --> src/mods.rs:2:16
[INFO] [stderr]   |
[INFO] [stderr] 2 |     pub struct person {
[INFO] [stderr]   |                ^^^^^^ help: convert the identifier to upper camel case: `Person`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `sex` should have an upper camel case name
[INFO] [stderr]   --> src/mods.rs:14:14
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub enum sex {
[INFO] [stderr]    |              ^^^ help: convert the identifier to upper camel case (notice the capitalization): `Sex`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `m` should have an upper camel case name
[INFO] [stderr]   --> src/mods.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         m,
[INFO] [stderr]    |         ^ help: convert the identifier to upper camel case: `M`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `f` should have an upper camel case name
[INFO] [stderr]   --> src/mods.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         f,
[INFO] [stderr]    |         ^ help: convert the identifier to upper camel case (notice the capitalization): `F`
[INFO] [stderr] 
[INFO] [stderr] warning: type `enum_` should have an upper camel case name
[INFO] [stderr]  --> src/enums.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 |     enum enum_ {
[INFO] [stderr]   |          ^^^^^ help: convert the identifier to upper camel case: `Enum`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `a` should have an upper camel case name
[INFO] [stderr]  --> src/enums.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |         a,
[INFO] [stderr]   |         ^ help: convert the identifier to upper camel case: `A`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `b` should have an upper camel case name
[INFO] [stderr]  --> src/enums.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |         b(String),
[INFO] [stderr]   |         ^ help: convert the identifier to upper camel case: `B`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `s` should have an upper camel case name
[INFO] [stderr]  --> src/enums.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         s { num: u32, name: String },
[INFO] [stderr]   |         ^ help: convert the identifier to upper camel case (notice the capitalization): `S`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `common::utils as u`
[INFO] [stderr]   --> src/main.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | use common::utils as u;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt::format`
[INFO] [stderr]  --> src/traits.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fmt::format;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `person` should have an upper camel case name
[INFO] [stderr]  --> src/mods.rs:2:16
[INFO] [stderr]   |
[INFO] [stderr] 2 |     pub struct person {
[INFO] [stderr]   |                ^^^^^^ help: convert the identifier to upper camel case: `Person`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `sex` should have an upper camel case name
[INFO] [stderr]   --> src/mods.rs:14:14
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub enum sex {
[INFO] [stderr]    |              ^^^ help: convert the identifier to upper camel case (notice the capitalization): `Sex`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `m` should have an upper camel case name
[INFO] [stderr]   --> src/mods.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         m,
[INFO] [stderr]    |         ^ help: convert the identifier to upper camel case: `M`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `f` should have an upper camel case name
[INFO] [stderr]   --> src/mods.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         f,
[INFO] [stderr]    |         ^ help: convert the identifier to upper camel case (notice the capitalization): `F`
[INFO] [stderr] 
[INFO] [stderr] warning: type `enum_` should have an upper camel case name
[INFO] [stderr]  --> src/enums.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 |     enum enum_ {
[INFO] [stderr]   |          ^^^^^ help: convert the identifier to upper camel case: `Enum`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `a` should have an upper camel case name
[INFO] [stderr]  --> src/enums.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |         a,
[INFO] [stderr]   |         ^ help: convert the identifier to upper camel case: `A`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `b` should have an upper camel case name
[INFO] [stderr]  --> src/enums.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |         b(String),
[INFO] [stderr]   |         ^ help: convert the identifier to upper camel case: `B`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `s` should have an upper camel case name
[INFO] [stderr]  --> src/enums.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         s { num: u32, name: String },
[INFO] [stderr]   |         ^ help: convert the identifier to upper camel case (notice the capitalization): `S`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `common::utils as u`
[INFO] [stderr]   --> src/main.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | use common::utils as u;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: irrefutable if-let pattern
[INFO] [stderr]   --> src/enums.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 | /     if let x = n {
[INFO] [stderr] 26 | |         println!("{}",x.unwrap())
[INFO] [stderr] 27 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/vector.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let i = v[0];
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `file`
[INFO] [stderr]  --> src/error.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 |         Ok(file) => {
[INFO] [stderr]   |            ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `err`
[INFO] [stderr]  --> src/error.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Err(err) => {
[INFO] [stderr]   |             ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/lifecircle.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let i = ImportantExcerpt { part: first_sentence };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/lifecircle.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sex`
[INFO] [stderr]   --> src/mods.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let sex = sex::m;
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sex`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num`
[INFO] [stderr]   --> src/enums.rs:21:20
[INFO] [stderr]    |
[INFO] [stderr] 21 |         enum_::s { num, name } => println!("s")
[INFO] [stderr]    |                    ^^^ help: try ignoring the field: `num: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]   --> src/enums.rs:21:25
[INFO] [stderr]    |
[INFO] [stderr] 21 |         enum_::s { num, name } => println!("s")
[INFO] [stderr]    |                         ^^^^ help: try ignoring the field: `name: _`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/vector.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let mut v = vec![1, 2, 3, 4, 5];
[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: `main`
[INFO] [stderr]  --> src/func.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn main () {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `say`
[INFO] [stderr]  --> src/func.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn say(age :u32) {
[INFO] [stderr]   |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]  --> src/func.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn add(age:u32) -> u32 {
[INFO] [stderr]   |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/vector.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/string.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/hashmap.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/error.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `f`
[INFO] [stderr]  --> src/error2.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn f(i: i32) -> Result<i32, bool> {
[INFO] [stderr]   |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `g`
[INFO] [stderr]  --> src/error2.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn g(i: i32) -> Result<i32, bool> {
[INFO] [stderr]   |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/error2.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_text_from_file`
[INFO] [stderr]  --> src/error3.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn read_text_from_file(path: &str) -> Result<String, io::Error> {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/error3.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]  --> src/generic.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Point<T> {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `x`
[INFO] [stderr]  --> src/generic.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 |     fn x(&self) -> &T {
[INFO] [stderr]   |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `distance_from_origin`
[INFO] [stderr]   --> src/generic.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/generic.rs:17:4
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `headline`
[INFO] [stderr]   --> src/traits.rs:43:8
[INFO] [stderr]    |
[INFO] [stderr] 43 |     fn headline(&self) -> &String{
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/traits.rs:47:4
[INFO] [stderr]    |
[INFO] [stderr] 47 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/lifecircle.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/lifecircle.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/lifecircle.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `level`
[INFO] [stderr]   --> src/lifecircle.rs:32:8
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn level(&self) -> i32 {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `announce_and_return_part`
[INFO] [stderr]   --> src/lifecircle.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `return_part`
[INFO] [stderr]   --> src/lifecircle.rs:40:8
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn return_part(&self) -> &str {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]   --> src/lifecircle.rs:48:4
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn first_word(s: &str) -> &str {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `person`
[INFO] [stderr]  --> src/mods.rs:2:16
[INFO] [stderr]   |
[INFO] [stderr] 2 |     pub struct person {
[INFO] [stderr]   |                ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]  --> src/mods.rs:7:16
[INFO] [stderr]   |
[INFO] [stderr] 7 |         pub fn new(name_str: String) -> person {
[INFO] [stderr]   |                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `sex`
[INFO] [stderr]   --> src/mods.rs:14:14
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub enum sex {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/mods.rs:27:4
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/enums.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: irrefutable if-let pattern
[INFO] [stderr]   --> src/enums.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 | /     if let x = n {
[INFO] [stderr] 26 | |         println!("{}",x.unwrap())
[INFO] [stderr] 27 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/vector.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let i = v[0];
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `file`
[INFO] [stderr]  --> src/error.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 |         Ok(file) => {
[INFO] [stderr]   |            ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `err`
[INFO] [stderr]  --> src/error.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Err(err) => {
[INFO] [stderr]   |             ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/lifecircle.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let i = ImportantExcerpt { part: first_sentence };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/lifecircle.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sex`
[INFO] [stderr]   --> src/mods.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let sex = sex::m;
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sex`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num`
[INFO] [stderr]   --> src/enums.rs:21:20
[INFO] [stderr]    |
[INFO] [stderr] 21 |         enum_::s { num, name } => println!("s")
[INFO] [stderr]    |                    ^^^ help: try ignoring the field: `num: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]   --> src/enums.rs:21:25
[INFO] [stderr]    |
[INFO] [stderr] 21 |         enum_::s { num, name } => println!("s")
[INFO] [stderr]    |                         ^^^^ help: try ignoring the field: `name: _`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/vector.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let mut v = vec![1, 2, 3, 4, 5];
[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: 50 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/func.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn main () {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `say`
[INFO] [stderr]  --> src/func.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn say(age :u32) {
[INFO] [stderr]   |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]  --> src/func.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn add(age:u32) -> u32 {
[INFO] [stderr]   |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/vector.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/string.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/hashmap.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/error.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `f`
[INFO] [stderr]  --> src/error2.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn f(i: i32) -> Result<i32, bool> {
[INFO] [stderr]   |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `g`
[INFO] [stderr]  --> src/error2.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn g(i: i32) -> Result<i32, bool> {
[INFO] [stderr]   |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/error2.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_text_from_file`
[INFO] [stderr]  --> src/error3.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn read_text_from_file(path: &str) -> Result<String, io::Error> {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/error3.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]  --> src/generic.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Point<T> {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `x`
[INFO] [stderr]  --> src/generic.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 |     fn x(&self) -> &T {
[INFO] [stderr]   |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `distance_from_origin`
[INFO] [stderr]   --> src/generic.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/generic.rs:17:4
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `headline`
[INFO] [stderr]   --> src/traits.rs:43:8
[INFO] [stderr]    |
[INFO] [stderr] 43 |     fn headline(&self) -> &String{
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/traits.rs:47:4
[INFO] [stderr]    |
[INFO] [stderr] 47 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/lifecircle.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/lifecircle.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/lifecircle.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `level`
[INFO] [stderr]   --> src/lifecircle.rs:32:8
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn level(&self) -> i32 {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `announce_and_return_part`
[INFO] [stderr]   --> src/lifecircle.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `return_part`
[INFO] [stderr]   --> src/lifecircle.rs:40:8
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn return_part(&self) -> &str {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]   --> src/lifecircle.rs:48:4
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn first_word(s: &str) -> &str {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `person`
[INFO] [stderr]  --> src/mods.rs:2:16
[INFO] [stderr]   |
[INFO] [stderr] 2 |     pub struct person {
[INFO] [stderr]   |                ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]  --> src/mods.rs:7:16
[INFO] [stderr]   |
[INFO] [stderr] 7 |         pub fn new(name_str: String) -> person {
[INFO] [stderr]   |                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `sex`
[INFO] [stderr]   --> src/mods.rs:14:14
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub enum sex {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/mods.rs:27:4
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/enums.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 50 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.45s
[INFO] running `"docker" "inspect" "f09cc1b159d3428385c54695d2f7fa0709d4b8139c708218c19154b1e9c62041"`
[INFO] running `"docker" "rm" "-f" "f09cc1b159d3428385c54695d2f7fa0709d4b8139c708218c19154b1e9c62041"`
[INFO] [stdout] f09cc1b159d3428385c54695d2f7fa0709d4b8139c708218c19154b1e9c62041