Nov 17 02:19:14.767 INFO testing gdemarcsek/learn-rust against master#6b9b97bd9b704f85f0184f7a213cc4d62bd9654c for pr-55982
Nov 17 02:19:14.767 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55982/worker-3/master#6b9b97bd9b704f85f0184f7a213cc4d62bd9654c:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-55982/master#6b9b97bd9b704f85f0184f7a213cc4d62bd9654c:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +6b9b97bd9b704f85f0184f7a213cc4d62bd9654c-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 17 02:19:15.192 INFO [stdout] 37dd5bbfdf514c0998ccd9e3c51f42fd8a3287b8337f1f00a9aebdda8cab4829
Nov 17 02:19:15.194 INFO running `"docker" "start" "-a" "37dd5bbfdf514c0998ccd9e3c51f42fd8a3287b8337f1f00a9aebdda8cab4829"`
Nov 17 02:19:16.674 INFO [stderr] usermod: no changes
Nov 17 02:19:16.731 INFO [stderr]    Compiling learn-rust v0.1.0 (/source)
Nov 17 02:19:17.139 INFO [stderr] warning: unused import: `std::*`
Nov 17 02:19:17.139 INFO [stderr]    --> src/main.rs:297:9
Nov 17 02:19:17.139 INFO [stderr]     |
Nov 17 02:19:17.139 INFO [stderr] 297 |     use std::*;         // glob import from Rust's standard library
Nov 17 02:19:17.139 INFO [stderr]     |         ^^^^^^
Nov 17 02:19:17.139 INFO [stderr]     |
Nov 17 02:19:17.139 INFO [stderr]     = note: #[warn(unused_imports)] on by default
Nov 17 02:19:17.139 INFO [stderr] 
Nov 17 02:19:17.279 INFO [stderr] warning: unreachable pattern
Nov 17 02:19:17.279 INFO [stderr]    --> src/main.rs:269:9
Nov 17 02:19:17.279 INFO [stderr]     |
Nov 17 02:19:17.279 INFO [stderr] 269 |         _ => -1,    // _ is a placeholder that matches any value - if we put it as last, this will mean what the "default" label menas for "switch" in C++
Nov 17 02:19:17.279 INFO [stderr]     |         ^
Nov 17 02:19:17.279 INFO [stderr]     |
Nov 17 02:19:17.279 INFO [stderr]     = note: #[warn(unreachable_patterns)] on by default
Nov 17 02:19:17.279 INFO [stderr] 
Nov 17 02:19:17.279 INFO [stderr] warning: unused variable: `x`
Nov 17 02:19:17.279 INFO [stderr]   --> src/main.rs:17:9
Nov 17 02:19:17.279 INFO [stderr]    |
Nov 17 02:19:17.279 INFO [stderr] 17 |     let x = 42;             // (type is inferred by the compiler whenever possible)
Nov 17 02:19:17.279 INFO [stderr]    |         ^ help: consider using `_x` instead
Nov 17 02:19:17.279 INFO [stderr]    |
Nov 17 02:19:17.279 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Nov 17 02:19:17.279 INFO [stderr] 
Nov 17 02:19:17.279 INFO [stderr] warning: variable `x` is assigned to, but never used
Nov 17 02:19:17.279 INFO [stderr]   --> src/main.rs:19:13
Nov 17 02:19:17.279 INFO [stderr]    |
Nov 17 02:19:17.279 INFO [stderr] 19 |     let mut x = 42;         // Now 'x' is declared to be mutable, thus...
Nov 17 02:19:17.279 INFO [stderr]    |             ^
Nov 17 02:19:17.279 INFO [stderr]    |
Nov 17 02:19:17.279 INFO [stderr]    = note: consider using `_x` instead
Nov 17 02:19:17.279 INFO [stderr] 
Nov 17 02:19:17.279 INFO [stderr] warning: value assigned to `x` is never read
Nov 17 02:19:17.279 INFO [stderr]   --> src/main.rs:20:5
Nov 17 02:19:17.279 INFO [stderr]    |
Nov 17 02:19:17.279 INFO [stderr] 20 |     x = 21;                 // its value can be changed later on
Nov 17 02:19:17.279 INFO [stderr]    |     ^
Nov 17 02:19:17.279 INFO [stderr]    |
Nov 17 02:19:17.279 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Nov 17 02:19:17.279 INFO [stderr] 
Nov 17 02:19:17.279 INFO [stderr] warning: unused variable: `s`
Nov 17 02:19:17.279 INFO [stderr]   --> src/main.rs:40:13
Nov 17 02:19:17.279 INFO [stderr]    |
Nov 17 02:19:17.279 INFO [stderr] 40 |         let s = String::from("dynamically allocated string");           // s owns the allocated memory...
Nov 17 02:19:17.279 INFO [stderr]    |             ^ help: consider using `_s` instead
Nov 17 02:19:17.279 INFO [stderr] 
Nov 17 02:19:17.279 INFO [stderr] warning: unused variable: `y`
Nov 17 02:19:17.280 INFO [stderr]   --> src/main.rs:50:9
Nov 17 02:19:17.280 INFO [stderr]    |
Nov 17 02:19:17.280 INFO [stderr] 50 |     let y = x;          // a copy of the value of 'x'
Nov 17 02:19:17.280 INFO [stderr]    |         ^ help: consider using `_y` instead
Nov 17 02:19:17.280 INFO [stderr] 
Nov 17 02:19:17.280 INFO [stderr] warning: unused variable: `s4`
Nov 17 02:19:17.280 INFO [stderr]   --> src/main.rs:72:9
Nov 17 02:19:17.280 INFO [stderr]    |
Nov 17 02:19:17.280 INFO [stderr] 72 |     let s4 = gives_ownership();
Nov 17 02:19:17.280 INFO [stderr]    |         ^^ help: consider using `_s4` instead
Nov 17 02:19:17.280 INFO [stderr] 
Nov 17 02:19:17.280 INFO [stderr] warning: unused variable: `r1`
Nov 17 02:19:17.280 INFO [stderr]    --> src/main.rs:105:13
Nov 17 02:19:17.280 INFO [stderr]     |
Nov 17 02:19:17.280 INFO [stderr] 105 |         let r1 = &mut s1;
Nov 17 02:19:17.280 INFO [stderr]     |             ^^ help: consider using `_r1` instead
Nov 17 02:19:17.280 INFO [stderr] 
Nov 17 02:19:17.280 INFO [stderr] warning: unused variable: `r2`
Nov 17 02:19:17.280 INFO [stderr]    --> src/main.rs:110:9
Nov 17 02:19:17.280 INFO [stderr]     |
Nov 17 02:19:17.280 INFO [stderr] 110 |     let r2 = &s1;                   // but out of the scope of 'r1', we can create a reference again...
Nov 17 02:19:17.280 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Nov 17 02:19:17.280 INFO [stderr] 
Nov 17 02:19:17.280 INFO [stderr] warning: unused variable: `r3`
Nov 17 02:19:17.280 INFO [stderr]    --> src/main.rs:111:9
Nov 17 02:19:17.280 INFO [stderr]     |
Nov 17 02:19:17.280 INFO [stderr] 111 |     let r3 = &s1;                   // ...even multiple immutable ones
Nov 17 02:19:17.280 INFO [stderr]     |         ^^ help: consider using `_r3` instead
Nov 17 02:19:17.280 INFO [stderr] 
Nov 17 02:19:17.280 INFO [stderr] warning: value assigned to `slice3` is never read
Nov 17 02:19:17.280 INFO [stderr]    --> src/main.rs:150:13
Nov 17 02:19:17.280 INFO [stderr]     |
Nov 17 02:19:17.280 INFO [stderr] 150 |     let mut slice3 = &s[1..6];
Nov 17 02:19:17.280 INFO [stderr]     |             ^^^^^^
Nov 17 02:19:17.295 INFO [stderr] 
Nov 17 02:19:17.295 INFO [stderr] warning: unused variable: `slice4`
Nov 17 02:19:17.295 INFO [stderr]    --> src/main.rs:155:9
Nov 17 02:19:17.295 INFO [stderr]     |
Nov 17 02:19:17.295 INFO [stderr] 155 |     let slice4: &[i32];         // the type of each item must be 'i32'
Nov 17 02:19:17.295 INFO [stderr]     |         ^^^^^^ help: consider using `_slice4` instead
Nov 17 02:19:17.295 INFO [stderr] 
Nov 17 02:19:17.295 INFO [stderr] warning: unused variable: `red`
Nov 17 02:19:17.295 INFO [stderr]    --> src/main.rs:191:9
Nov 17 02:19:17.295 INFO [stderr]     |
Nov 17 02:19:17.295 INFO [stderr] 191 |     let red = RGBColor(0xff, 0x00, 0x00);
Nov 17 02:19:17.295 INFO [stderr]     |         ^^^ help: consider using `_red` instead
Nov 17 02:19:17.295 INFO [stderr] 
Nov 17 02:19:17.295 INFO [stderr] warning: unused variable: `foreign`
Nov 17 02:19:17.295 INFO [stderr]    --> src/main.rs:233:9
Nov 17 02:19:17.295 INFO [stderr]     |
Nov 17 02:19:17.295 INFO [stderr] 233 |     let foreign = IpAddress::V6(314159263, 123442);
Nov 17 02:19:17.295 INFO [stderr]     |         ^^^^^^^ help: consider using `_foreign` instead
Nov 17 02:19:17.295 INFO [stderr] 
Nov 17 02:19:17.295 INFO [stderr] warning: unused variable: `some_ip`
Nov 17 02:19:17.295 INFO [stderr]    --> src/main.rs:238:9
Nov 17 02:19:17.295 INFO [stderr]     |
Nov 17 02:19:17.295 INFO [stderr] 238 |     let some_ip = Some(home);
Nov 17 02:19:17.295 INFO [stderr]     |         ^^^^^^^ help: consider using `_some_ip` instead
Nov 17 02:19:17.295 INFO [stderr] 
Nov 17 02:19:17.295 INFO [stderr] warning: unused variable: `absent_ip`
Nov 17 02:19:17.295 INFO [stderr]    --> src/main.rs:240:9
Nov 17 02:19:17.295 INFO [stderr]     |
Nov 17 02:19:17.295 INFO [stderr] 240 |     let absent_ip: Option<IpAddress> = None; 
Nov 17 02:19:17.295 INFO [stderr]     |         ^^^^^^^^^ help: consider using `_absent_ip` instead
Nov 17 02:19:17.295 INFO [stderr] 
Nov 17 02:19:17.295 INFO [stderr] warning: unused variable: `x`
Nov 17 02:19:17.295 INFO [stderr]    --> src/main.rs:243:9
Nov 17 02:19:17.295 INFO [stderr]     |
Nov 17 02:19:17.295 INFO [stderr] 243 |     let x: i8 = 5;
Nov 17 02:19:17.295 INFO [stderr]     |         ^ help: consider using `_x` instead
Nov 17 02:19:17.295 INFO [stderr] 
Nov 17 02:19:17.295 INFO [stderr] warning: unused variable: `y`
Nov 17 02:19:17.295 INFO [stderr]    --> src/main.rs:244:9
Nov 17 02:19:17.295 INFO [stderr]     |
Nov 17 02:19:17.295 INFO [stderr] 244 |     let y: Option<i8> = Some(5);
Nov 17 02:19:17.295 INFO [stderr]     |         ^ help: consider using `_y` instead
Nov 17 02:19:17.295 INFO [stderr] 
Nov 17 02:19:17.295 INFO [stderr] warning: unused variable: `retcode`
Nov 17 02:19:17.295 INFO [stderr]    --> src/main.rs:259:9
Nov 17 02:19:17.296 INFO [stderr]     |
Nov 17 02:19:17.296 INFO [stderr] 259 |     let retcode = match error {     // match forces us to cover all possible cases
Nov 17 02:19:17.296 INFO [stderr]     |         ^^^^^^^ help: consider using `_retcode` instead
Nov 17 02:19:17.296 INFO [stderr] 
Nov 17 02:19:17.311 INFO [stderr] warning: variable does not need to be mutable
Nov 17 02:19:17.311 INFO [stderr]    --> src/main.rs:139:9
Nov 17 02:19:17.311 INFO [stderr]     |
Nov 17 02:19:17.311 INFO [stderr] 139 |     let mut s = String::from("hello world");
Nov 17 02:19:17.311 INFO [stderr]     |         ----^
Nov 17 02:19:17.311 INFO [stderr]     |         |
Nov 17 02:19:17.311 INFO [stderr]     |         help: remove this `mut`
Nov 17 02:19:17.311 INFO [stderr]     |
Nov 17 02:19:17.311 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Nov 17 02:19:17.311 INFO [stderr] 
Nov 17 02:19:17.319 INFO [stderr] warning: variant is never constructed: `NetworkError`
Nov 17 02:19:17.319 INFO [stderr]    --> src/main.rs:252:9
Nov 17 02:19:17.319 INFO [stderr]     |
Nov 17 02:19:17.319 INFO [stderr] 252 |         NetworkError,
Nov 17 02:19:17.319 INFO [stderr]     |         ^^^^^^^^^^^^
Nov 17 02:19:17.319 INFO [stderr]     |
Nov 17 02:19:17.319 INFO [stderr]     = note: #[warn(dead_code)] on by default
Nov 17 02:19:17.319 INFO [stderr] 
Nov 17 02:19:17.319 INFO [stderr] warning: variant is never constructed: `SerilizationError`
Nov 17 02:19:17.319 INFO [stderr]    --> src/main.rs:253:9
Nov 17 02:19:17.319 INFO [stderr]     |
Nov 17 02:19:17.319 INFO [stderr] 253 |         SerilizationError(String),
Nov 17 02:19:17.319 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 17 02:19:17.319 INFO [stderr] 
Nov 17 02:19:17.319 INFO [stderr] warning: function is never used: `closures`
Nov 17 02:19:17.319 INFO [stderr]    --> src/main.rs:310:1
Nov 17 02:19:17.319 INFO [stderr]     |
Nov 17 02:19:17.319 INFO [stderr] 310 | fn closures() {
Nov 17 02:19:17.319 INFO [stderr]     | ^^^^^^^^^^^^^
Nov 17 02:19:17.319 INFO [stderr] 
Nov 17 02:19:17.319 INFO [stderr] warning: variable `className` should have a snake case name such as `class_name`
Nov 17 02:19:17.319 INFO [stderr]    --> src/main.rs:264:41
Nov 17 02:19:17.319 INFO [stderr]     |
Nov 17 02:19:17.319 INFO [stderr] 264 |         RPCCallError::SerilizationError(className) => {
Nov 17 02:19:17.320 INFO [stderr]     |                                         ^^^^^^^^^
Nov 17 02:19:17.320 INFO [stderr]     |
Nov 17 02:19:17.320 INFO [stderr]     = note: #[warn(non_snake_case)] on by default
Nov 17 02:19:17.320 INFO [stderr] 
Nov 17 02:19:18.032 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.33s
Nov 17 02:19:18.036 INFO [stderr] su: No module specific data is present
Nov 17 02:19:19.284 INFO running `"docker" "inspect" "37dd5bbfdf514c0998ccd9e3c51f42fd8a3287b8337f1f00a9aebdda8cab4829"`
Nov 17 02:19:19.545 INFO running `"docker" "rm" "-f" "37dd5bbfdf514c0998ccd9e3c51f42fd8a3287b8337f1f00a9aebdda8cab4829"`
Nov 17 02:19:19.838 INFO [stdout] 37dd5bbfdf514c0998ccd9e3c51f42fd8a3287b8337f1f00a9aebdda8cab4829
Nov 17 02:19:19.841 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55982/worker-3/master#6b9b97bd9b704f85f0184f7a213cc4d62bd9654c:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-55982/master#6b9b97bd9b704f85f0184f7a213cc4d62bd9654c:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +6b9b97bd9b704f85f0184f7a213cc4d62bd9654c-alt test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 17 02:19:20.349 INFO [stdout] e6b1fd921b656163df38805a06f643a0d0f3fbef22666369a1d970a865d16d05
Nov 17 02:19:20.352 INFO running `"docker" "start" "-a" "e6b1fd921b656163df38805a06f643a0d0f3fbef22666369a1d970a865d16d05"`
Nov 17 02:19:21.587 INFO [stderr] usermod: no changes
Nov 17 02:19:21.671 INFO [stderr]    Compiling learn-rust v0.1.0 (/source)
Nov 17 02:19:22.162 INFO [stderr] warning: unused import: `std::*`
Nov 17 02:19:22.162 INFO [stderr]    --> src/main.rs:297:9
Nov 17 02:19:22.162 INFO [stderr]     |
Nov 17 02:19:22.162 INFO [stderr] 297 |     use std::*;         // glob import from Rust's standard library
Nov 17 02:19:22.162 INFO [stderr]     |         ^^^^^^
Nov 17 02:19:22.162 INFO [stderr]     |
Nov 17 02:19:22.162 INFO [stderr]     = note: #[warn(unused_imports)] on by default
Nov 17 02:19:22.162 INFO [stderr] 
Nov 17 02:19:22.257 INFO [stderr] warning: unreachable pattern
Nov 17 02:19:22.258 INFO [stderr]    --> src/main.rs:269:9
Nov 17 02:19:22.258 INFO [stderr]     |
Nov 17 02:19:22.258 INFO [stderr] 269 |         _ => -1,    // _ is a placeholder that matches any value - if we put it as last, this will mean what the "default" label menas for "switch" in C++
Nov 17 02:19:22.258 INFO [stderr]     |         ^
Nov 17 02:19:22.259 INFO [stderr]     |
Nov 17 02:19:22.259 INFO [stderr]     = note: #[warn(unreachable_patterns)] on by default
Nov 17 02:19:22.259 INFO [stderr] 
Nov 17 02:19:22.260 INFO [stderr] warning: unused variable: `x`
Nov 17 02:19:22.260 INFO [stderr]   --> src/main.rs:17:9
Nov 17 02:19:22.260 INFO [stderr]    |
Nov 17 02:19:22.261 INFO [stderr] 17 |     let x = 42;             // (type is inferred by the compiler whenever possible)
Nov 17 02:19:22.261 INFO [stderr]    |         ^ help: consider using `_x` instead
Nov 17 02:19:22.261 INFO [stderr]    |
Nov 17 02:19:22.262 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Nov 17 02:19:22.262 INFO [stderr] 
Nov 17 02:19:22.262 INFO [stderr] warning: variable `x` is assigned to, but never used
Nov 17 02:19:22.263 INFO [stderr]   --> src/main.rs:19:13
Nov 17 02:19:22.263 INFO [stderr]    |
Nov 17 02:19:22.263 INFO [stderr] 19 |     let mut x = 42;         // Now 'x' is declared to be mutable, thus...
Nov 17 02:19:22.264 INFO [stderr]    |             ^
Nov 17 02:19:22.264 INFO [stderr]    |
Nov 17 02:19:22.264 INFO [stderr]    = note: consider using `_x` instead
Nov 17 02:19:22.264 INFO [stderr] 
Nov 17 02:19:22.265 INFO [stderr] warning: value assigned to `x` is never read
Nov 17 02:19:22.265 INFO [stderr]   --> src/main.rs:20:5
Nov 17 02:19:22.265 INFO [stderr]    |
Nov 17 02:19:22.266 INFO [stderr] 20 |     x = 21;                 // its value can be changed later on
Nov 17 02:19:22.266 INFO [stderr]    |     ^
Nov 17 02:19:22.266 INFO [stderr]    |
Nov 17 02:19:22.267 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Nov 17 02:19:22.267 INFO [stderr] 
Nov 17 02:19:22.267 INFO [stderr] warning: unused variable: `s`
Nov 17 02:19:22.268 INFO [stderr]   --> src/main.rs:40:13
Nov 17 02:19:22.268 INFO [stderr]    |
Nov 17 02:19:22.268 INFO [stderr] 40 |         let s = String::from("dynamically allocated string");           // s owns the allocated memory...
Nov 17 02:19:22.268 INFO [stderr]    |             ^ help: consider using `_s` instead
Nov 17 02:19:22.269 INFO [stderr] 
Nov 17 02:19:22.269 INFO [stderr] warning: unused variable: `y`
Nov 17 02:19:22.269 INFO [stderr]   --> src/main.rs:50:9
Nov 17 02:19:22.270 INFO [stderr]    |
Nov 17 02:19:22.270 INFO [stderr] 50 |     let y = x;          // a copy of the value of 'x'
Nov 17 02:19:22.270 INFO [stderr]    |         ^ help: consider using `_y` instead
Nov 17 02:19:22.270 INFO [stderr] 
Nov 17 02:19:22.271 INFO [stderr] warning: unused variable: `s4`
Nov 17 02:19:22.271 INFO [stderr]   --> src/main.rs:72:9
Nov 17 02:19:22.271 INFO [stderr]    |
Nov 17 02:19:22.272 INFO [stderr] 72 |     let s4 = gives_ownership();
Nov 17 02:19:22.272 INFO [stderr]    |         ^^ help: consider using `_s4` instead
Nov 17 02:19:22.272 INFO [stderr] 
Nov 17 02:19:22.272 INFO [stderr] warning: unused variable: `r1`
Nov 17 02:19:22.273 INFO [stderr]    --> src/main.rs:105:13
Nov 17 02:19:22.273 INFO [stderr]     |
Nov 17 02:19:22.273 INFO [stderr] 105 |         let r1 = &mut s1;
Nov 17 02:19:22.274 INFO [stderr]     |             ^^ help: consider using `_r1` instead
Nov 17 02:19:22.274 INFO [stderr] 
Nov 17 02:19:22.274 INFO [stderr] warning: unused variable: `r2`
Nov 17 02:19:22.274 INFO [stderr]    --> src/main.rs:110:9
Nov 17 02:19:22.275 INFO [stderr]     |
Nov 17 02:19:22.275 INFO [stderr] 110 |     let r2 = &s1;                   // but out of the scope of 'r1', we can create a reference again...
Nov 17 02:19:22.275 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Nov 17 02:19:22.276 INFO [stderr] 
Nov 17 02:19:22.276 INFO [stderr] warning: unused variable: `r3`
Nov 17 02:19:22.276 INFO [stderr]    --> src/main.rs:111:9
Nov 17 02:19:22.277 INFO [stderr]     |
Nov 17 02:19:22.277 INFO [stderr] 111 |     let r3 = &s1;                   // ...even multiple immutable ones
Nov 17 02:19:22.277 INFO [stderr]     |         ^^ help: consider using `_r3` instead
Nov 17 02:19:22.278 INFO [stderr] 
Nov 17 02:19:22.278 INFO [stderr] warning: value assigned to `slice3` is never read
Nov 17 02:19:22.278 INFO [stderr]    --> src/main.rs:150:13
Nov 17 02:19:22.279 INFO [stderr]     |
Nov 17 02:19:22.279 INFO [stderr] 150 |     let mut slice3 = &s[1..6];
Nov 17 02:19:22.279 INFO [stderr]     |             ^^^^^^
Nov 17 02:19:22.279 INFO [stderr] 
Nov 17 02:19:22.280 INFO [stderr] warning: unused variable: `slice4`
Nov 17 02:19:22.280 INFO [stderr]    --> src/main.rs:155:9
Nov 17 02:19:22.280 INFO [stderr]     |
Nov 17 02:19:22.281 INFO [stderr] 155 |     let slice4: &[i32];         // the type of each item must be 'i32'
Nov 17 02:19:22.281 INFO [stderr]     |         ^^^^^^ help: consider using `_slice4` instead
Nov 17 02:19:22.281 INFO [stderr] 
Nov 17 02:19:22.282 INFO [stderr] warning: unused variable: `red`
Nov 17 02:19:22.282 INFO [stderr]    --> src/main.rs:191:9
Nov 17 02:19:22.282 INFO [stderr]     |
Nov 17 02:19:22.283 INFO [stderr] 191 |     let red = RGBColor(0xff, 0x00, 0x00);
Nov 17 02:19:22.283 INFO [stderr]     |         ^^^ help: consider using `_red` instead
Nov 17 02:19:22.283 INFO [stderr] 
Nov 17 02:19:22.284 INFO [stderr] warning: unused variable: `foreign`
Nov 17 02:19:22.284 INFO [stderr]    --> src/main.rs:233:9
Nov 17 02:19:22.284 INFO [stderr]     |
Nov 17 02:19:22.284 INFO [stderr] 233 |     let foreign = IpAddress::V6(314159263, 123442);
Nov 17 02:19:22.285 INFO [stderr]     |         ^^^^^^^ help: consider using `_foreign` instead
Nov 17 02:19:22.285 INFO [stderr] 
Nov 17 02:19:22.285 INFO [stderr] warning: unused variable: `some_ip`
Nov 17 02:19:22.285 INFO [stderr]    --> src/main.rs:238:9
Nov 17 02:19:22.286 INFO [stderr]     |
Nov 17 02:19:22.286 INFO [stderr] 238 |     let some_ip = Some(home);
Nov 17 02:19:22.286 INFO [stderr]     |         ^^^^^^^ help: consider using `_some_ip` instead
Nov 17 02:19:22.286 INFO [stderr] 
Nov 17 02:19:22.287 INFO [stderr] warning: unused variable: `absent_ip`
Nov 17 02:19:22.287 INFO [stderr]    --> src/main.rs:240:9
Nov 17 02:19:22.287 INFO [stderr]     |
Nov 17 02:19:22.288 INFO [stderr] 240 |     let absent_ip: Option<IpAddress> = None; 
Nov 17 02:19:22.288 INFO [stderr]     |         ^^^^^^^^^ help: consider using `_absent_ip` instead
Nov 17 02:19:22.288 INFO [stderr] 
Nov 17 02:19:22.288 INFO [stderr] warning: unused variable: `x`
Nov 17 02:19:22.289 INFO [stderr]    --> src/main.rs:243:9
Nov 17 02:19:22.289 INFO [stderr]     |
Nov 17 02:19:22.289 INFO [stderr] 243 |     let x: i8 = 5;
Nov 17 02:19:22.289 INFO [stderr]     |         ^ help: consider using `_x` instead
Nov 17 02:19:22.290 INFO [stderr] 
Nov 17 02:19:22.290 INFO [stderr] warning: unused variable: `y`
Nov 17 02:19:22.290 INFO [stderr]    --> src/main.rs:244:9
Nov 17 02:19:22.291 INFO [stderr]     |
Nov 17 02:19:22.291 INFO [stderr] 244 |     let y: Option<i8> = Some(5);
Nov 17 02:19:22.291 INFO [stderr]     |         ^ help: consider using `_y` instead
Nov 17 02:19:22.291 INFO [stderr] 
Nov 17 02:19:22.292 INFO [stderr] warning: unused variable: `retcode`
Nov 17 02:19:22.292 INFO [stderr]    --> src/main.rs:259:9
Nov 17 02:19:22.292 INFO [stderr]     |
Nov 17 02:19:22.292 INFO [stderr] 259 |     let retcode = match error {     // match forces us to cover all possible cases
Nov 17 02:19:22.292 INFO [stderr]     |         ^^^^^^^ help: consider using `_retcode` instead
Nov 17 02:19:22.292 INFO [stderr] 
Nov 17 02:19:22.292 INFO [stderr] warning: variable does not need to be mutable
Nov 17 02:19:22.293 INFO [stderr]    --> src/main.rs:139:9
Nov 17 02:19:22.293 INFO [stderr]     |
Nov 17 02:19:22.293 INFO [stderr] 139 |     let mut s = String::from("hello world");
Nov 17 02:19:22.293 INFO [stderr]     |         ----^
Nov 17 02:19:22.293 INFO [stderr]     |         |
Nov 17 02:19:22.293 INFO [stderr]     |         help: remove this `mut`
Nov 17 02:19:22.293 INFO [stderr]     |
Nov 17 02:19:22.293 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Nov 17 02:19:22.293 INFO [stderr] 
Nov 17 02:19:22.293 INFO [stderr] warning: variant is never constructed: `NetworkError`
Nov 17 02:19:22.293 INFO [stderr]    --> src/main.rs:252:9
Nov 17 02:19:22.293 INFO [stderr]     |
Nov 17 02:19:22.293 INFO [stderr] 252 |         NetworkError,
Nov 17 02:19:22.293 INFO [stderr]     |         ^^^^^^^^^^^^
Nov 17 02:19:22.293 INFO [stderr]     |
Nov 17 02:19:22.293 INFO [stderr]     = note: #[warn(dead_code)] on by default
Nov 17 02:19:22.293 INFO [stderr] 
Nov 17 02:19:22.293 INFO [stderr] warning: variant is never constructed: `SerilizationError`
Nov 17 02:19:22.293 INFO [stderr]    --> src/main.rs:253:9
Nov 17 02:19:22.293 INFO [stderr]     |
Nov 17 02:19:22.293 INFO [stderr] 253 |         SerilizationError(String),
Nov 17 02:19:22.293 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 17 02:19:22.293 INFO [stderr] 
Nov 17 02:19:22.293 INFO [stderr] warning: function is never used: `closures`
Nov 17 02:19:22.293 INFO [stderr]    --> src/main.rs:310:1
Nov 17 02:19:22.293 INFO [stderr]     |
Nov 17 02:19:22.293 INFO [stderr] 310 | fn closures() {
Nov 17 02:19:22.293 INFO [stderr]     | ^^^^^^^^^^^^^
Nov 17 02:19:22.293 INFO [stderr] 
Nov 17 02:19:22.293 INFO [stderr] warning: variable `className` should have a snake case name such as `class_name`
Nov 17 02:19:22.293 INFO [stderr]    --> src/main.rs:264:41
Nov 17 02:19:22.293 INFO [stderr]     |
Nov 17 02:19:22.293 INFO [stderr] 264 |         RPCCallError::SerilizationError(className) => {
Nov 17 02:19:22.293 INFO [stderr]     |                                         ^^^^^^^^^
Nov 17 02:19:22.293 INFO [stderr]     |
Nov 17 02:19:22.293 INFO [stderr]     = note: #[warn(non_snake_case)] on by default
Nov 17 02:19:22.293 INFO [stderr] 
Nov 17 02:19:22.661 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.03s
Nov 17 02:19:22.667 INFO [stderr] su: No module specific data is present
Nov 17 02:19:23.566 INFO running `"docker" "inspect" "e6b1fd921b656163df38805a06f643a0d0f3fbef22666369a1d970a865d16d05"`
Nov 17 02:19:23.867 INFO running `"docker" "rm" "-f" "e6b1fd921b656163df38805a06f643a0d0f3fbef22666369a1d970a865d16d05"`
Nov 17 02:19:24.103 INFO [stdout] e6b1fd921b656163df38805a06f643a0d0f3fbef22666369a1d970a865d16d05
Nov 17 02:19:24.107 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55982/worker-3/master#6b9b97bd9b704f85f0184f7a213cc4d62bd9654c:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-55982/master#6b9b97bd9b704f85f0184f7a213cc4d62bd9654c:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +6b9b97bd9b704f85f0184f7a213cc4d62bd9654c-alt test --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 17 02:19:24.580 INFO [stdout] cfd53004687ad148e2d73cb10df0b349c3c802b228e8c5d6aab01c946ef868d4
Nov 17 02:19:24.585 INFO running `"docker" "start" "-a" "cfd53004687ad148e2d73cb10df0b349c3c802b228e8c5d6aab01c946ef868d4"`
Nov 17 02:19:26.444 INFO [stderr] usermod: no changes
Nov 17 02:19:26.511 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
Nov 17 02:19:26.512 INFO [stderr]      Running /target/debug/deps/learn_rust-4789aded2da82e6e
Nov 17 02:19:26.541 INFO [stdout] 
Nov 17 02:19:26.542 INFO [stdout] running 0 tests
Nov 17 02:19:26.544 INFO [stdout] 
Nov 17 02:19:26.544 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Nov 17 02:19:26.545 INFO [stdout] 
Nov 17 02:19:26.545 INFO [stderr] su: No module specific data is present
Nov 17 02:19:27.419 INFO running `"docker" "inspect" "cfd53004687ad148e2d73cb10df0b349c3c802b228e8c5d6aab01c946ef868d4"`
Nov 17 02:19:27.665 INFO running `"docker" "rm" "-f" "cfd53004687ad148e2d73cb10df0b349c3c802b228e8c5d6aab01c946ef868d4"`
Nov 17 02:19:27.963 INFO [stdout] cfd53004687ad148e2d73cb10df0b349c3c802b228e8c5d6aab01c946ef868d4