[INFO] cloning repository https://github.com/HillBamboo/learn_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/HillBamboo/learn_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHillBamboo%2Flearn_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHillBamboo%2Flearn_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f772f033dcf258227431aecd75d2c04f01f5746c
[INFO] checking HillBamboo/learn_rust against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHillBamboo%2Flearn_rust" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/HillBamboo/learn_rust on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/HillBamboo/learn_rust
[INFO] finished tweaking git repo https://github.com/HillBamboo/learn_rust
[INFO] tweaked toml for git repo https://github.com/HillBamboo/learn_rust written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/HillBamboo/learn_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8af90b5b55762950523921b1d29a1a895de3637d8232e7ec26137c4aa7182c09
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8af90b5b55762950523921b1d29a1a895de3637d8232e7ec26137c4aa7182c09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8af90b5b55762950523921b1d29a1a895de3637d8232e7ec26137c4aa7182c09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8af90b5b55762950523921b1d29a1a895de3637d8232e7ec26137c4aa7182c09", kill_on_drop: false }`
[INFO] [stdout] 8af90b5b55762950523921b1d29a1a895de3637d8232e7ec26137c4aa7182c09
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=forbid" "-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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 96ab407c45003c4b55ef5d9cba74187b9cf87ba24cda0f45d54b72df09985754
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "96ab407c45003c4b55ef5d9cba74187b9cf87ba24cda0f45d54b72df09985754", kill_on_drop: false }`
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking learn_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:28:57
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn take_ownership(s : String) { println!("{}", s); };
[INFO] [stdout]    |                                                         ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:36:6
[INFO] [stdout]    |
[INFO] [stdout] 36 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `HashSet`, `VecDeque`
[INFO] [stdout]  --> src/rust_book/ch8_collections.rs:2:33
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::{HashMap, HashSet, VecDeque};
[INFO] [stdout]   |                                 ^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::fs;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::io;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::fs::File;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `Write`
[INFO] [stdout]   --> src/main.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::io::{Write, Error};
[INFO] [stdout]    |               ^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:28:57
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn take_ownership(s : String) { println!("{}", s); };
[INFO] [stdout]    |                                                         ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:36:6
[INFO] [stdout]    |
[INFO] [stdout] 36 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `HashSet`, `VecDeque`
[INFO] [stdout]  --> src/rust_book/ch8_collections.rs:2:33
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::{HashMap, HashSet, VecDeque};
[INFO] [stdout]   |                                 ^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::fs;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::io;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::fs::File;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `Write`
[INFO] [stdout]   --> src/main.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::io::{Write, Error};
[INFO] [stdout]    |               ^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning[E0170]: pattern binding `A` is named the same as one of the variants of the type `XXD`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(A) => println!("a"),
[INFO] [stdout]    |              ^ help: to match on the variant, qualify the path: `XXD::A`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning[E0170]: pattern binding `A` is named the same as one of the variants of the type `XXD`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(A) => println!("a"),
[INFO] [stdout]    |              ^ help: to match on the variant, qualify the path: `XXD::A`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `idx`
[INFO] [stdout]  --> src/rust_book/ch3_common_concepts.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let idx = 123;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_idx`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `idx`
[INFO] [stdout]  --> src/rust_book/ch3_common_concepts.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let idx = 123;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_idx`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a2`
[INFO] [stdout]   --> src/rust_book/ch3_common_concepts.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let a2 = [4; 6];
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_a2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a2`
[INFO] [stdout]   --> src/rust_book/ch3_common_concepts.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let a2 = [4; 6];
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_a2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `atuple`
[INFO] [stdout]   --> src/rust_book/ch3_common_concepts.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let atuple = ("123", 2, 3);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_atuple`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `atuple`
[INFO] [stdout]   --> src/rust_book/ch3_common_concepts.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let atuple = ("123", 2, 3);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_atuple`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cnt`
[INFO] [stdout]   --> src/rust_book/ch3_common_concepts.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let cnt = loop {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cnt`
[INFO] [stdout]   --> src/rust_book/ch3_common_concepts.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let cnt = loop {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r3`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let r3 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r3`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let r3 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ss1`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let ss1 = gives_ownership();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_ss1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ss1`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let ss1 = gives_ownership();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_ss1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `localhost`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let localhost = IpAddr{
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_localhost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `localhost`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let localhost = IpAddr{
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_localhost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let loopback = IpAddr {
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let loopback = IpAddr {
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `localhost`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let localhost = IpAddr::V4(String::from("127.0.0.1"));
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_localhost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `localhost`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let localhost = IpAddr::V4(String::from("127.0.0.1"));
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_localhost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let loopback =  IpAddr::V6(String::from("::1"));
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let loopback =  IpAddr::V6(String::from("::1"));
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let x : i32 = 123;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let x : i32 = 123;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:38:13
[INFO] [stdout]    |
[INFO] [stdout] 38 |         let y : Option<i32> = Some(5);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:38:13
[INFO] [stdout]    |
[INFO] [stdout] 38 |         let y : Option<i32> = Some(5);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let r1 = Rectangle { width : 12, height : 33};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let r1 = Rectangle { width : 12, height : 33};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let x : Option<UsState> = None;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let x : Option<UsState> = None;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let six = plus_one(five);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let six = plus_one(five);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i32`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:22:14
[INFO] [stdout]    |
[INFO] [stdout] 22 |         Some(i32) => println!("i32"),
[INFO] [stdout]    |              ^^^ help: if this is intentional, prefix it with an underscore: `_i32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i32`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:22:14
[INFO] [stdout]    |
[INFO] [stdout] 22 |         Some(i32) => println!("i32"),
[INFO] [stdout]    |              ^^^ help: if this is intentional, prefix it with an underscore: `_i32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `A`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(A) => println!("a"),
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_A`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `A`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(A) => println!("a"),
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_A`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `does_not_exist`
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let does_not_exist = v.get(100);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `does_not_exist`
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let does_not_exist = v.get(100);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let row = vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let row = vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let s = d1.to_string();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let s = d1.to_string();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let s = "Initial contents".to_string();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let s = "Initial contents".to_string();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let f = match File::open("heex.txt") {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let f = match File::open("heex.txt") {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let f = File::open("hello.txt").unwrap_or_else(|error| {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let f = File::open("hello.txt").unwrap_or_else(|error| {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x1`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let x1 = Point {x : 5, y : 10.3};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x1`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let x1 = Point {x : 5, y : 10.3};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x1`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let x1 = Point {x : "5", y : 10.3};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x1`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let x1 = Point {x : "5", y : 10.3};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x1`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let x1 = Point {x : 5.123, y : 10.3};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x1`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let x1 = Point {x : 5.123, y : 10.3};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let i = ImportantExcerpt { part: first_sentence };
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let i = ImportantExcerpt { part: first_sentence };
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:38:42
[INFO] [stdout]    |
[INFO] [stdout] 38 |         fn longest<'a, 'b>(s1 : &'a str, s2 : &'b str) -> &'a str {
[INFO] [stdout]    |                                          ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:38:42
[INFO] [stdout]    |
[INFO] [stdout] 38 |         fn longest<'a, 'b>(s1 : &'a str, s2 : &'b str) -> &'a str {
[INFO] [stdout]    |                                          ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_or_borrow`
[INFO] [stdout]  --> src/rust_book/ch4_ownership.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn move_or_borrow() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `owership`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn owership() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `borrow`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn borrow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_sematics_for_user_defined_type`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn move_sematics_for_user_defined_type() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `show`
[INFO] [stdout]    --> src/rust_book/ch4_ownership.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |         fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |             kind : IpAddrKind,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |             address : String,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |         width : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         height : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |         fn area(&self) -> u32 {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |         fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Apple`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         Apple,
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Banane`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         Banane,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Watermelon`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Watermelon,
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         A,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         B,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `C`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         C,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `headline`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     headline: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `location`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     location: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `author`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     author: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     reply: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |             part: &'a str,
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 |         fn longest<'a, 'b>(s1 : &'a str, s2 : &'b str) -> &'a str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         x : T,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_or_borrow`
[INFO] [stdout]  --> src/rust_book/ch4_ownership.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn move_or_borrow() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `owership`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn owership() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `borrow`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn borrow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_sematics_for_user_defined_type`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn move_sematics_for_user_defined_type() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `show`
[INFO] [stdout]    --> src/rust_book/ch4_ownership.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |         fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |             kind : IpAddrKind,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         y : U,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `A` should have a snake case name
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(A) => println!("a"),
[INFO] [stdout]    |              ^ help: convert the identifier to snake case: `a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |     for i in &v1 { i; }
[INFO] [stdout]    |                    ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |             address : String,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |         width : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         height : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |         fn area(&self) -> u32 {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |         fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Apple`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         Apple,
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Banane`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         Banane,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Watermelon`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Watermelon,
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         A,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         B,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `C`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         C,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `headline`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     headline: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `location`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     location: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `author`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     author: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     reply: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |             part: &'a str,
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 |         fn longest<'a, 'b>(s1 : &'a str, s2 : &'b str) -> &'a str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         x : T,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         y : U,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `A` should have a snake case name
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(A) => println!("a"),
[INFO] [stdout]    |              ^ help: convert the identifier to snake case: `a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |     for i in &v1 { i; }
[INFO] [stdout]    |                    ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 68 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stdout] warning: 68 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.21s
[INFO] running `Command { std: "docker" "inspect" "96ab407c45003c4b55ef5d9cba74187b9cf87ba24cda0f45d54b72df09985754", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96ab407c45003c4b55ef5d9cba74187b9cf87ba24cda0f45d54b72df09985754", kill_on_drop: false }`
[INFO] [stdout] 96ab407c45003c4b55ef5d9cba74187b9cf87ba24cda0f45d54b72df09985754