Nov 30 02:37:13.161 INFO checking gdemarcsek/learn-rust against try#32252761328f59ccfadb1bafb8148c685bc830b3 for pr-56323
Nov 30 02:37:13.161 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56323/worker-3/try#32252761328f59ccfadb1bafb8148c685bc830b3:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-56323/try#32252761328f59ccfadb1bafb8148c685bc830b3:/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 +32252761328f59ccfadb1bafb8148c685bc830b3-alt check --frozen --all --all-targets" "-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 30 02:37:13.580 INFO [stdout] d751ae29b0e60e7314a7d74c29407fe450fcd6be9cf2c8115e2c12c9a8447ed7
Nov 30 02:37:13.586 INFO running `"docker" "start" "-a" "d751ae29b0e60e7314a7d74c29407fe450fcd6be9cf2c8115e2c12c9a8447ed7"`
Nov 30 02:37:15.388 INFO [stderr] usermod: no changes
Nov 30 02:37:15.444 INFO [stderr]     Checking learn-rust v0.1.0 (/source)
Nov 30 02:37:15.792 INFO [stderr] warning: unused import: `std::*`
Nov 30 02:37:15.792 INFO [stderr]    --> src/main.rs:297:9
Nov 30 02:37:15.793 INFO [stderr]     |
Nov 30 02:37:15.793 INFO [stderr] 297 |     use std::*;         // glob import from Rust's standard library
Nov 30 02:37:15.793 INFO [stderr]     |         ^^^^^^
Nov 30 02:37:15.793 INFO [stderr]     |
Nov 30 02:37:15.794 INFO [stderr]     = note: #[warn(unused_imports)] on by default
Nov 30 02:37:15.794 INFO [stderr] 
Nov 30 02:37:15.874 INFO [stderr] warning: unreachable pattern
Nov 30 02:37:15.874 INFO [stderr]    --> src/main.rs:269:9
Nov 30 02:37:15.874 INFO [stderr]     |
Nov 30 02:37:15.875 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 30 02:37:15.875 INFO [stderr]     |         ^
Nov 30 02:37:15.875 INFO [stderr]     |
Nov 30 02:37:15.875 INFO [stderr]     = note: #[warn(unreachable_patterns)] on by default
Nov 30 02:37:15.876 INFO [stderr] 
Nov 30 02:37:15.876 INFO [stderr] warning: unused variable: `x`
Nov 30 02:37:15.877 INFO [stderr]   --> src/main.rs:17:9
Nov 30 02:37:15.877 INFO [stderr]    |
Nov 30 02:37:15.877 INFO [stderr] 17 |     let x = 42;             // (type is inferred by the compiler whenever possible)
Nov 30 02:37:15.877 INFO [stderr]    |         ^ help: consider using `_x` instead
Nov 30 02:37:15.878 INFO [stderr]    |
Nov 30 02:37:15.878 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Nov 30 02:37:15.878 INFO [stderr] 
Nov 30 02:37:15.878 INFO [stderr] warning: variable `x` is assigned to, but never used
Nov 30 02:37:15.879 INFO [stderr]   --> src/main.rs:19:13
Nov 30 02:37:15.879 INFO [stderr]    |
Nov 30 02:37:15.879 INFO [stderr] 19 |     let mut x = 42;         // Now 'x' is declared to be mutable, thus...
Nov 30 02:37:15.879 INFO [stderr]    |             ^
Nov 30 02:37:15.879 INFO [stderr]    |
Nov 30 02:37:15.879 INFO [stderr]    = note: consider using `_x` instead
Nov 30 02:37:15.879 INFO [stderr] 
Nov 30 02:37:15.880 INFO [stderr] warning: value assigned to `x` is never read
Nov 30 02:37:15.880 INFO [stderr]   --> src/main.rs:20:5
Nov 30 02:37:15.880 INFO [stderr]    |
Nov 30 02:37:15.880 INFO [stderr] 20 |     x = 21;                 // its value can be changed later on
Nov 30 02:37:15.880 INFO [stderr]    |     ^
Nov 30 02:37:15.880 INFO [stderr]    |
Nov 30 02:37:15.881 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Nov 30 02:37:15.881 INFO [stderr] 
Nov 30 02:37:15.881 INFO [stderr] warning: unused variable: `s`
Nov 30 02:37:15.881 INFO [stderr]   --> src/main.rs:40:13
Nov 30 02:37:15.881 INFO [stderr]    |
Nov 30 02:37:15.881 INFO [stderr] 40 |         let s = String::from("dynamically allocated string");           // s owns the allocated memory...
Nov 30 02:37:15.881 INFO [stderr]    |             ^ help: consider using `_s` instead
Nov 30 02:37:15.882 INFO [stderr] 
Nov 30 02:37:15.882 INFO [stderr] warning: unused variable: `y`
Nov 30 02:37:15.882 INFO [stderr]   --> src/main.rs:50:9
Nov 30 02:37:15.882 INFO [stderr]    |
Nov 30 02:37:15.882 INFO [stderr] 50 |     let y = x;          // a copy of the value of 'x'
Nov 30 02:37:15.882 INFO [stderr]    |         ^ help: consider using `_y` instead
Nov 30 02:37:15.882 INFO [stderr] 
Nov 30 02:37:15.883 INFO [stderr] warning: unused variable: `s4`
Nov 30 02:37:15.883 INFO [stderr]   --> src/main.rs:72:9
Nov 30 02:37:15.883 INFO [stderr]    |
Nov 30 02:37:15.883 INFO [stderr] 72 |     let s4 = gives_ownership();
Nov 30 02:37:15.883 INFO [stderr]    |         ^^ help: consider using `_s4` instead
Nov 30 02:37:15.883 INFO [stderr] 
Nov 30 02:37:15.883 INFO [stderr] warning: unused variable: `r1`
Nov 30 02:37:15.884 INFO [stderr]    --> src/main.rs:105:13
Nov 30 02:37:15.884 INFO [stderr]     |
Nov 30 02:37:15.884 INFO [stderr] 105 |         let r1 = &mut s1;
Nov 30 02:37:15.884 INFO [stderr]     |             ^^ help: consider using `_r1` instead
Nov 30 02:37:15.884 INFO [stderr] 
Nov 30 02:37:15.884 INFO [stderr] warning: unused variable: `r2`
Nov 30 02:37:15.884 INFO [stderr]    --> src/main.rs:110:9
Nov 30 02:37:15.884 INFO [stderr]     |
Nov 30 02:37:15.884 INFO [stderr] 110 |     let r2 = &s1;                   // but out of the scope of 'r1', we can create a reference again...
Nov 30 02:37:15.884 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Nov 30 02:37:15.885 INFO [stderr] 
Nov 30 02:37:15.885 INFO [stderr] warning: unused variable: `r3`
Nov 30 02:37:15.885 INFO [stderr]    --> src/main.rs:111:9
Nov 30 02:37:15.885 INFO [stderr]     |
Nov 30 02:37:15.885 INFO [stderr] 111 |     let r3 = &s1;                   // ...even multiple immutable ones
Nov 30 02:37:15.885 INFO [stderr]     |         ^^ help: consider using `_r3` instead
Nov 30 02:37:15.885 INFO [stderr] 
Nov 30 02:37:15.886 INFO [stderr] warning: value assigned to `slice3` is never read
Nov 30 02:37:15.886 INFO [stderr]    --> src/main.rs:150:13
Nov 30 02:37:15.886 INFO [stderr]     |
Nov 30 02:37:15.886 INFO [stderr] 150 |     let mut slice3 = &s[1..6];
Nov 30 02:37:15.886 INFO [stderr]     |             ^^^^^^
Nov 30 02:37:15.886 INFO [stderr] 
Nov 30 02:37:15.887 INFO [stderr] warning: unused variable: `slice4`
Nov 30 02:37:15.887 INFO [stderr]    --> src/main.rs:155:9
Nov 30 02:37:15.887 INFO [stderr]     |
Nov 30 02:37:15.887 INFO [stderr] 155 |     let slice4: &[i32];         // the type of each item must be 'i32'
Nov 30 02:37:15.887 INFO [stderr]     |         ^^^^^^ help: consider using `_slice4` instead
Nov 30 02:37:15.887 INFO [stderr] 
Nov 30 02:37:15.887 INFO [stderr] warning: unused variable: `red`
Nov 30 02:37:15.887 INFO [stderr]    --> src/main.rs:191:9
Nov 30 02:37:15.887 INFO [stderr]     |
Nov 30 02:37:15.887 INFO [stderr] 191 |     let red = RGBColor(0xff, 0x00, 0x00);
Nov 30 02:37:15.888 INFO [stderr]     |         ^^^ help: consider using `_red` instead
Nov 30 02:37:15.888 INFO [stderr] 
Nov 30 02:37:15.888 INFO [stderr] warning: unused variable: `foreign`
Nov 30 02:37:15.888 INFO [stderr]    --> src/main.rs:233:9
Nov 30 02:37:15.888 INFO [stderr]     |
Nov 30 02:37:15.888 INFO [stderr] 233 |     let foreign = IpAddress::V6(314159263, 123442);
Nov 30 02:37:15.888 INFO [stderr]     |         ^^^^^^^ help: consider using `_foreign` instead
Nov 30 02:37:15.889 INFO [stderr] 
Nov 30 02:37:15.889 INFO [stderr] warning: unused variable: `some_ip`
Nov 30 02:37:15.889 INFO [stderr]    --> src/main.rs:238:9
Nov 30 02:37:15.889 INFO [stderr]     |
Nov 30 02:37:15.889 INFO [stderr] 238 |     let some_ip = Some(home);
Nov 30 02:37:15.889 INFO [stderr]     |         ^^^^^^^ help: consider using `_some_ip` instead
Nov 30 02:37:15.889 INFO [stderr] 
Nov 30 02:37:15.890 INFO [stderr] warning: unused variable: `absent_ip`
Nov 30 02:37:15.890 INFO [stderr]    --> src/main.rs:240:9
Nov 30 02:37:15.890 INFO [stderr]     |
Nov 30 02:37:15.890 INFO [stderr] 240 |     let absent_ip: Option<IpAddress> = None; 
Nov 30 02:37:15.890 INFO [stderr]     |         ^^^^^^^^^ help: consider using `_absent_ip` instead
Nov 30 02:37:15.890 INFO [stderr] 
Nov 30 02:37:15.890 INFO [stderr] warning: unused variable: `x`
Nov 30 02:37:15.890 INFO [stderr]    --> src/main.rs:243:9
Nov 30 02:37:15.890 INFO [stderr]     |
Nov 30 02:37:15.890 INFO [stderr] 243 |     let x: i8 = 5;
Nov 30 02:37:15.890 INFO [stderr]     |         ^ help: consider using `_x` instead
Nov 30 02:37:15.891 INFO [stderr] 
Nov 30 02:37:15.891 INFO [stderr] warning: unused variable: `y`
Nov 30 02:37:15.891 INFO [stderr]    --> src/main.rs:244:9
Nov 30 02:37:15.891 INFO [stderr]     |
Nov 30 02:37:15.891 INFO [stderr] 244 |     let y: Option<i8> = Some(5);
Nov 30 02:37:15.891 INFO [stderr]     |         ^ help: consider using `_y` instead
Nov 30 02:37:15.891 INFO [stderr] 
Nov 30 02:37:15.891 INFO [stderr] warning: unused variable: `retcode`
Nov 30 02:37:15.891 INFO [stderr]    --> src/main.rs:259:9
Nov 30 02:37:15.891 INFO [stderr]     |
Nov 30 02:37:15.892 INFO [stderr] 259 |     let retcode = match error {     // match forces us to cover all possible cases
Nov 30 02:37:15.892 INFO [stderr]     |         ^^^^^^^ help: consider using `_retcode` instead
Nov 30 02:37:15.892 INFO [stderr] 
Nov 30 02:37:15.902 INFO [stderr] warning: variable does not need to be mutable
Nov 30 02:37:15.902 INFO [stderr]    --> src/main.rs:139:9
Nov 30 02:37:15.902 INFO [stderr]     |
Nov 30 02:37:15.902 INFO [stderr] 139 |     let mut s = String::from("hello world");
Nov 30 02:37:15.902 INFO [stderr]     |         ----^
Nov 30 02:37:15.902 INFO [stderr]     |         |
Nov 30 02:37:15.902 INFO [stderr]     |         help: remove this `mut`
Nov 30 02:37:15.902 INFO [stderr]     |
Nov 30 02:37:15.903 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Nov 30 02:37:15.903 INFO [stderr] 
Nov 30 02:37:15.920 INFO [stderr] warning: variant is never constructed: `NetworkError`
Nov 30 02:37:15.920 INFO [stderr]    --> src/main.rs:252:9
Nov 30 02:37:15.921 INFO [stderr]     |
Nov 30 02:37:15.921 INFO [stderr] 252 |         NetworkError,
Nov 30 02:37:15.921 INFO [stderr]     |         ^^^^^^^^^^^^
Nov 30 02:37:15.921 INFO [stderr]     |
Nov 30 02:37:15.921 INFO [stderr]     = note: #[warn(dead_code)] on by default
Nov 30 02:37:15.921 INFO [stderr] 
Nov 30 02:37:15.921 INFO [stderr] warning: variant is never constructed: `SerilizationError`
Nov 30 02:37:15.921 INFO [stderr]    --> src/main.rs:253:9
Nov 30 02:37:15.921 INFO [stderr]     |
Nov 30 02:37:15.921 INFO [stderr] 253 |         SerilizationError(String),
Nov 30 02:37:15.921 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 30 02:37:15.921 INFO [stderr] 
Nov 30 02:37:15.922 INFO [stderr] warning: function is never used: `closures`
Nov 30 02:37:15.922 INFO [stderr]    --> src/main.rs:310:1
Nov 30 02:37:15.922 INFO [stderr]     |
Nov 30 02:37:15.922 INFO [stderr] 310 | fn closures() {
Nov 30 02:37:15.922 INFO [stderr]     | ^^^^^^^^^^^^^
Nov 30 02:37:15.922 INFO [stderr] 
Nov 30 02:37:15.925 INFO [stderr] warning: variable `className` should have a snake case name such as `class_name`
Nov 30 02:37:15.926 INFO [stderr]    --> src/main.rs:264:41
Nov 30 02:37:15.926 INFO [stderr]     |
Nov 30 02:37:15.926 INFO [stderr] 264 |         RPCCallError::SerilizationError(className) => {
Nov 30 02:37:15.926 INFO [stderr]     |                                         ^^^^^^^^^
Nov 30 02:37:15.926 INFO [stderr]     |
Nov 30 02:37:15.926 INFO [stderr]     = note: #[warn(non_snake_case)] on by default
Nov 30 02:37:15.926 INFO [stderr] 
Nov 30 02:37:16.156 INFO [stderr] warning: unused import: `std::*`
Nov 30 02:37:16.156 INFO [stderr]    --> src/main.rs:297:9
Nov 30 02:37:16.156 INFO [stderr]     |
Nov 30 02:37:16.156 INFO [stderr] 297 |     use std::*;         // glob import from Rust's standard library
Nov 30 02:37:16.156 INFO [stderr]     |         ^^^^^^
Nov 30 02:37:16.156 INFO [stderr]     |
Nov 30 02:37:16.156 INFO [stderr]     = note: #[warn(unused_imports)] on by default
Nov 30 02:37:16.156 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unreachable pattern
Nov 30 02:37:16.245 INFO [stderr]    --> src/main.rs:269:9
Nov 30 02:37:16.245 INFO [stderr]     |
Nov 30 02:37:16.245 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 30 02:37:16.245 INFO [stderr]     |         ^
Nov 30 02:37:16.245 INFO [stderr]     |
Nov 30 02:37:16.245 INFO [stderr]     = note: #[warn(unreachable_patterns)] on by default
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `x`
Nov 30 02:37:16.245 INFO [stderr]   --> src/main.rs:17:9
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr] 17 |     let x = 42;             // (type is inferred by the compiler whenever possible)
Nov 30 02:37:16.245 INFO [stderr]    |         ^ help: consider using `_x` instead
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: variable `x` is assigned to, but never used
Nov 30 02:37:16.245 INFO [stderr]   --> src/main.rs:19:13
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr] 19 |     let mut x = 42;         // Now 'x' is declared to be mutable, thus...
Nov 30 02:37:16.245 INFO [stderr]    |             ^
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr]    = note: consider using `_x` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: value assigned to `x` is never read
Nov 30 02:37:16.245 INFO [stderr]   --> src/main.rs:20:5
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr] 20 |     x = 21;                 // its value can be changed later on
Nov 30 02:37:16.245 INFO [stderr]    |     ^
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `s`
Nov 30 02:37:16.245 INFO [stderr]   --> src/main.rs:40:13
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr] 40 |         let s = String::from("dynamically allocated string");           // s owns the allocated memory...
Nov 30 02:37:16.245 INFO [stderr]    |             ^ help: consider using `_s` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `y`
Nov 30 02:37:16.245 INFO [stderr]   --> src/main.rs:50:9
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr] 50 |     let y = x;          // a copy of the value of 'x'
Nov 30 02:37:16.245 INFO [stderr]    |         ^ help: consider using `_y` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `s4`
Nov 30 02:37:16.245 INFO [stderr]   --> src/main.rs:72:9
Nov 30 02:37:16.245 INFO [stderr]    |
Nov 30 02:37:16.245 INFO [stderr] 72 |     let s4 = gives_ownership();
Nov 30 02:37:16.245 INFO [stderr]    |         ^^ help: consider using `_s4` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `r1`
Nov 30 02:37:16.245 INFO [stderr]    --> src/main.rs:105:13
Nov 30 02:37:16.245 INFO [stderr]     |
Nov 30 02:37:16.245 INFO [stderr] 105 |         let r1 = &mut s1;
Nov 30 02:37:16.245 INFO [stderr]     |             ^^ help: consider using `_r1` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `r2`
Nov 30 02:37:16.245 INFO [stderr]    --> src/main.rs:110:9
Nov 30 02:37:16.245 INFO [stderr]     |
Nov 30 02:37:16.245 INFO [stderr] 110 |     let r2 = &s1;                   // but out of the scope of 'r1', we can create a reference again...
Nov 30 02:37:16.245 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `r3`
Nov 30 02:37:16.245 INFO [stderr]    --> src/main.rs:111:9
Nov 30 02:37:16.245 INFO [stderr]     |
Nov 30 02:37:16.245 INFO [stderr] 111 |     let r3 = &s1;                   // ...even multiple immutable ones
Nov 30 02:37:16.245 INFO [stderr]     |         ^^ help: consider using `_r3` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: value assigned to `slice3` is never read
Nov 30 02:37:16.245 INFO [stderr]    --> src/main.rs:150:13
Nov 30 02:37:16.245 INFO [stderr]     |
Nov 30 02:37:16.245 INFO [stderr] 150 |     let mut slice3 = &s[1..6];
Nov 30 02:37:16.245 INFO [stderr]     |             ^^^^^^
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `slice4`
Nov 30 02:37:16.245 INFO [stderr]    --> src/main.rs:155:9
Nov 30 02:37:16.245 INFO [stderr]     |
Nov 30 02:37:16.245 INFO [stderr] 155 |     let slice4: &[i32];         // the type of each item must be 'i32'
Nov 30 02:37:16.245 INFO [stderr]     |         ^^^^^^ help: consider using `_slice4` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.245 INFO [stderr] warning: unused variable: `red`
Nov 30 02:37:16.245 INFO [stderr]    --> src/main.rs:191:9
Nov 30 02:37:16.245 INFO [stderr]     |
Nov 30 02:37:16.245 INFO [stderr] 191 |     let red = RGBColor(0xff, 0x00, 0x00);
Nov 30 02:37:16.245 INFO [stderr]     |         ^^^ help: consider using `_red` instead
Nov 30 02:37:16.245 INFO [stderr] 
Nov 30 02:37:16.246 INFO [stderr] warning: unused variable: `foreign`
Nov 30 02:37:16.246 INFO [stderr]    --> src/main.rs:233:9
Nov 30 02:37:16.246 INFO [stderr]     |
Nov 30 02:37:16.246 INFO [stderr] 233 |     let foreign = IpAddress::V6(314159263, 123442);
Nov 30 02:37:16.246 INFO [stderr]     |         ^^^^^^^ help: consider using `_foreign` instead
Nov 30 02:37:16.246 INFO [stderr] 
Nov 30 02:37:16.246 INFO [stderr] warning: unused variable: `some_ip`
Nov 30 02:37:16.246 INFO [stderr]    --> src/main.rs:238:9
Nov 30 02:37:16.246 INFO [stderr]     |
Nov 30 02:37:16.246 INFO [stderr] 238 |     let some_ip = Some(home);
Nov 30 02:37:16.246 INFO [stderr]     |         ^^^^^^^ help: consider using `_some_ip` instead
Nov 30 02:37:16.246 INFO [stderr] 
Nov 30 02:37:16.246 INFO [stderr] warning: unused variable: `absent_ip`
Nov 30 02:37:16.246 INFO [stderr]    --> src/main.rs:240:9
Nov 30 02:37:16.246 INFO [stderr]     |
Nov 30 02:37:16.246 INFO [stderr] 240 |     let absent_ip: Option<IpAddress> = None; 
Nov 30 02:37:16.246 INFO [stderr]     |         ^^^^^^^^^ help: consider using `_absent_ip` instead
Nov 30 02:37:16.246 INFO [stderr] 
Nov 30 02:37:16.246 INFO [stderr] warning: unused variable: `x`
Nov 30 02:37:16.246 INFO [stderr]    --> src/main.rs:243:9
Nov 30 02:37:16.246 INFO [stderr]     |
Nov 30 02:37:16.246 INFO [stderr] 243 |     let x: i8 = 5;
Nov 30 02:37:16.246 INFO [stderr]     |         ^ help: consider using `_x` instead
Nov 30 02:37:16.246 INFO [stderr] 
Nov 30 02:37:16.246 INFO [stderr] warning: unused variable: `y`
Nov 30 02:37:16.246 INFO [stderr]    --> src/main.rs:244:9
Nov 30 02:37:16.246 INFO [stderr]     |
Nov 30 02:37:16.246 INFO [stderr] 244 |     let y: Option<i8> = Some(5);
Nov 30 02:37:16.246 INFO [stderr]     |         ^ help: consider using `_y` instead
Nov 30 02:37:16.246 INFO [stderr] 
Nov 30 02:37:16.246 INFO [stderr] warning: unused variable: `retcode`
Nov 30 02:37:16.246 INFO [stderr]    --> src/main.rs:259:9
Nov 30 02:37:16.246 INFO [stderr]     |
Nov 30 02:37:16.246 INFO [stderr] 259 |     let retcode = match error {     // match forces us to cover all possible cases
Nov 30 02:37:16.246 INFO [stderr]     |         ^^^^^^^ help: consider using `_retcode` instead
Nov 30 02:37:16.246 INFO [stderr] 
Nov 30 02:37:16.255 INFO [stderr] warning: variable does not need to be mutable
Nov 30 02:37:16.255 INFO [stderr]    --> src/main.rs:139:9
Nov 30 02:37:16.255 INFO [stderr]     |
Nov 30 02:37:16.255 INFO [stderr] 139 |     let mut s = String::from("hello world");
Nov 30 02:37:16.255 INFO [stderr]     |         ----^
Nov 30 02:37:16.255 INFO [stderr]     |         |
Nov 30 02:37:16.255 INFO [stderr]     |         help: remove this `mut`
Nov 30 02:37:16.255 INFO [stderr]     |
Nov 30 02:37:16.255 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Nov 30 02:37:16.255 INFO [stderr] 
Nov 30 02:37:16.262 INFO [stderr] warning: variant is never constructed: `NetworkError`
Nov 30 02:37:16.262 INFO [stderr]    --> src/main.rs:252:9
Nov 30 02:37:16.262 INFO [stderr]     |
Nov 30 02:37:16.262 INFO [stderr] 252 |         NetworkError,
Nov 30 02:37:16.262 INFO [stderr]     |         ^^^^^^^^^^^^
Nov 30 02:37:16.262 INFO [stderr]     |
Nov 30 02:37:16.262 INFO [stderr]     = note: #[warn(dead_code)] on by default
Nov 30 02:37:16.262 INFO [stderr] 
Nov 30 02:37:16.262 INFO [stderr] warning: variant is never constructed: `SerilizationError`
Nov 30 02:37:16.262 INFO [stderr]    --> src/main.rs:253:9
Nov 30 02:37:16.262 INFO [stderr]     |
Nov 30 02:37:16.262 INFO [stderr] 253 |         SerilizationError(String),
Nov 30 02:37:16.262 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 30 02:37:16.262 INFO [stderr] 
Nov 30 02:37:16.262 INFO [stderr] warning: function is never used: `closures`
Nov 30 02:37:16.262 INFO [stderr]    --> src/main.rs:310:1
Nov 30 02:37:16.262 INFO [stderr]     |
Nov 30 02:37:16.262 INFO [stderr] 310 | fn closures() {
Nov 30 02:37:16.262 INFO [stderr]     | ^^^^^^^^^^^^^
Nov 30 02:37:16.262 INFO [stderr] 
Nov 30 02:37:16.262 INFO [stderr] warning: variable `className` should have a snake case name such as `class_name`
Nov 30 02:37:16.262 INFO [stderr]    --> src/main.rs:264:41
Nov 30 02:37:16.262 INFO [stderr]     |
Nov 30 02:37:16.262 INFO [stderr] 264 |         RPCCallError::SerilizationError(className) => {
Nov 30 02:37:16.262 INFO [stderr]     |                                         ^^^^^^^^^
Nov 30 02:37:16.262 INFO [stderr]     |
Nov 30 02:37:16.262 INFO [stderr]     = note: #[warn(non_snake_case)] on by default
Nov 30 02:37:16.262 INFO [stderr] 
Nov 30 02:37:16.296 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
Nov 30 02:37:16.296 INFO [stderr] su: No module specific data is present
Nov 30 02:37:17.640 INFO running `"docker" "inspect" "d751ae29b0e60e7314a7d74c29407fe450fcd6be9cf2c8115e2c12c9a8447ed7"`
Nov 30 02:37:18.000 INFO running `"docker" "rm" "-f" "d751ae29b0e60e7314a7d74c29407fe450fcd6be9cf2c8115e2c12c9a8447ed7"`
Nov 30 02:37:18.404 INFO [stdout] d751ae29b0e60e7314a7d74c29407fe450fcd6be9cf2c8115e2c12c9a8447ed7