Dec 12 03:04:05.162 INFO checking EdenCao/rust_learning against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 03:04:05.162 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-4/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-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"`
Dec 12 03:04:05.586 INFO [stdout] c840eaab9616a815a26c36cabc4a942595b33552e2fcc8fe3d5e49128d254d4f
Dec 12 03:04:05.588 INFO running `"docker" "start" "-a" "c840eaab9616a815a26c36cabc4a942595b33552e2fcc8fe3d5e49128d254d4f"`
Dec 12 03:04:07.012 INFO [stderr] usermod: no changes
Dec 12 03:04:07.124 INFO [stderr]     Checking rust_learning v0.1.0 (/source)
Dec 12 03:04:08.540 INFO [stderr] warning: variable `count` is assigned to, but never used
Dec 12 03:04:08.540 INFO [stderr]   --> src/iflet.rs:20:11
Dec 12 03:04:08.540 INFO [stderr]    |
Dec 12 03:04:08.540 INFO [stderr] 20 |   let mut count = 0;
Dec 12 03:04:08.540 INFO [stderr]    |           ^^^^^
Dec 12 03:04:08.540 INFO [stderr]    |
Dec 12 03:04:08.540 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:08.540 INFO [stderr]    = note: consider using `_count` instead
Dec 12 03:04:08.540 INFO [stderr] 
Dec 12 03:04:08.540 INFO [stderr] warning: value assigned to `count` is never read
Dec 12 03:04:08.540 INFO [stderr]   --> src/iflet.rs:25:5
Dec 12 03:04:08.540 INFO [stderr]    |
Dec 12 03:04:08.540 INFO [stderr] 25 |     count += 1;
Dec 12 03:04:08.541 INFO [stderr]    |     ^^^^^
Dec 12 03:04:08.541 INFO [stderr]    |
Dec 12 03:04:08.541 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 12 03:04:08.541 INFO [stderr] 
Dec 12 03:04:08.541 INFO [stderr] warning: variant is never constructed: `Penny`
Dec 12 03:04:08.541 INFO [stderr]  --> src/iflet.rs:2:3
Dec 12 03:04:08.541 INFO [stderr]   |
Dec 12 03:04:08.541 INFO [stderr] 2 |   Penny,
Dec 12 03:04:08.541 INFO [stderr]   |   ^^^^^
Dec 12 03:04:08.541 INFO [stderr]   |
Dec 12 03:04:08.541 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 12 03:04:08.541 INFO [stderr] 
Dec 12 03:04:08.541 INFO [stderr] warning: variant is never constructed: `Nickel`
Dec 12 03:04:08.541 INFO [stderr]  --> src/iflet.rs:3:3
Dec 12 03:04:08.541 INFO [stderr]   |
Dec 12 03:04:08.541 INFO [stderr] 3 |   Nickel,
Dec 12 03:04:08.541 INFO [stderr]   |   ^^^^^^
Dec 12 03:04:08.541 INFO [stderr] 
Dec 12 03:04:08.541 INFO [stderr] warning: variant is never constructed: `Dime`
Dec 12 03:04:08.541 INFO [stderr]  --> src/iflet.rs:4:3
Dec 12 03:04:08.541 INFO [stderr]   |
Dec 12 03:04:08.541 INFO [stderr] 4 |   Dime,
Dec 12 03:04:08.541 INFO [stderr]   |   ^^^^
Dec 12 03:04:08.541 INFO [stderr] 
Dec 12 03:04:08.541 INFO [stderr] warning: variant is never constructed: `Alabama`
Dec 12 03:04:08.541 INFO [stderr]   --> src/iflet.rs:10:3
Dec 12 03:04:08.541 INFO [stderr]    |
Dec 12 03:04:08.541 INFO [stderr] 10 |   Alabama,
Dec 12 03:04:08.541 INFO [stderr]    |   ^^^^^^^
Dec 12 03:04:08.541 INFO [stderr] 
Dec 12 03:04:09.070 INFO [stderr] warning: unused variable: `user2`
Dec 12 03:04:09.070 INFO [stderr]   --> src/struct.rs:14:7
Dec 12 03:04:09.070 INFO [stderr]    |
Dec 12 03:04:09.070 INFO [stderr] 14 |   let user2 = User {
Dec 12 03:04:09.070 INFO [stderr]    |       ^^^^^ help: consider using `_user2` instead
Dec 12 03:04:09.070 INFO [stderr]    |
Dec 12 03:04:09.070 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:09.070 INFO [stderr] 
Dec 12 03:04:09.070 INFO [stderr] warning: unused variable: `black`
Dec 12 03:04:09.070 INFO [stderr]   --> src/struct.rs:20:7
Dec 12 03:04:09.070 INFO [stderr]    |
Dec 12 03:04:09.070 INFO [stderr] 20 |   let black = Color(0, 0, 0);
Dec 12 03:04:09.070 INFO [stderr]    |       ^^^^^ help: consider using `_black` instead
Dec 12 03:04:09.071 INFO [stderr] 
Dec 12 03:04:09.084 INFO [stderr] warning: field is never used: `username`
Dec 12 03:04:09.084 INFO [stderr]  --> src/struct.rs:2:3
Dec 12 03:04:09.084 INFO [stderr]   |
Dec 12 03:04:09.084 INFO [stderr] 2 |   username: String,
Dec 12 03:04:09.084 INFO [stderr]   |   ^^^^^^^^^^^^^^^^
Dec 12 03:04:09.084 INFO [stderr]   |
Dec 12 03:04:09.084 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 12 03:04:09.084 INFO [stderr] 
Dec 12 03:04:09.084 INFO [stderr] warning: field is never used: `email`
Dec 12 03:04:09.084 INFO [stderr]  --> src/struct.rs:3:3
Dec 12 03:04:09.084 INFO [stderr]   |
Dec 12 03:04:09.084 INFO [stderr] 3 |   email: String,
Dec 12 03:04:09.084 INFO [stderr]   |   ^^^^^^^^^^^^^
Dec 12 03:04:09.084 INFO [stderr] 
Dec 12 03:04:09.084 INFO [stderr] warning: field is never used: `sign_in_count`
Dec 12 03:04:09.084 INFO [stderr]  --> src/struct.rs:4:3
Dec 12 03:04:09.084 INFO [stderr]   |
Dec 12 03:04:09.084 INFO [stderr] 4 |   sign_in_count: u64,
Dec 12 03:04:09.084 INFO [stderr]   |   ^^^^^^^^^^^^^^^^^^
Dec 12 03:04:09.084 INFO [stderr] 
Dec 12 03:04:09.084 INFO [stderr] warning: field is never used: `active`
Dec 12 03:04:09.084 INFO [stderr]  --> src/struct.rs:5:3
Dec 12 03:04:09.084 INFO [stderr]   |
Dec 12 03:04:09.084 INFO [stderr] 5 |   active: bool
Dec 12 03:04:09.085 INFO [stderr]   |   ^^^^^^^^^^^^
Dec 12 03:04:09.085 INFO [stderr] 
Dec 12 03:04:10.052 INFO [stderr] warning: unused variable: `integer`
Dec 12 03:04:10.052 INFO [stderr]   --> src/generics.rs:14:7
Dec 12 03:04:10.053 INFO [stderr]    |
Dec 12 03:04:10.053 INFO [stderr] 14 |   let integer = Point {
Dec 12 03:04:10.053 INFO [stderr]    |       ^^^^^^^ help: consider using `_integer` instead
Dec 12 03:04:10.053 INFO [stderr]    |
Dec 12 03:04:10.053 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:10.053 INFO [stderr] 
Dec 12 03:04:10.063 INFO [stderr] warning: field is never used: `y`
Dec 12 03:04:10.063 INFO [stderr]  --> src/generics.rs:3:3
Dec 12 03:04:10.063 INFO [stderr]   |
Dec 12 03:04:10.063 INFO [stderr] 3 |   y: T
Dec 12 03:04:10.063 INFO [stderr]   |   ^^^^
Dec 12 03:04:10.063 INFO [stderr]   |
Dec 12 03:04:10.063 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 12 03:04:10.063 INFO [stderr] 
Dec 12 03:04:10.102 INFO [stderr] warning: doc comment not used by rustdoc
Dec 12 03:04:10.102 INFO [stderr]   --> src/struct_ex.rs:17:3
Dec 12 03:04:10.103 INFO [stderr]    |
Dec 12 03:04:10.103 INFO [stderr] 17 |   ///
Dec 12 03:04:10.103 INFO [stderr]    |   ^^^
Dec 12 03:04:10.103 INFO [stderr]    |
Dec 12 03:04:10.103 INFO [stderr]    = note: #[warn(unused_doc_comments)] on by default
Dec 12 03:04:10.103 INFO [stderr] 
Dec 12 03:04:10.256 INFO [stderr] warning: field is never used: `query`
Dec 12 03:04:10.257 INFO [stderr]   --> src/read.rs:27:5
Dec 12 03:04:10.257 INFO [stderr]    |
Dec 12 03:04:10.257 INFO [stderr] 27 |     query: String,
Dec 12 03:04:10.257 INFO [stderr]    |     ^^^^^^^^^^^^^
Dec 12 03:04:10.258 INFO [stderr]    |
Dec 12 03:04:10.258 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 12 03:04:10.258 INFO [stderr] 
Dec 12 03:04:10.258 INFO [stderr] warning: function is never used: `search_case_insensitive`
Dec 12 03:04:10.259 INFO [stderr]   --> src/read.rs:82:1
Dec 12 03:04:10.259 INFO [stderr]    |
Dec 12 03:04:10.259 INFO [stderr] 82 | fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
Dec 12 03:04:10.259 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 03:04:10.259 INFO [stderr] 
Dec 12 03:04:10.860 INFO [stderr] warning: unused variable: `post`
Dec 12 03:04:10.861 INFO [stderr]   --> src/blog.rs:30:25
Dec 12 03:04:10.861 INFO [stderr]    |
Dec 12 03:04:10.862 INFO [stderr] 30 |   fn content<'a>(&self, post: &'a Post) -> &'a str {
Dec 12 03:04:10.862 INFO [stderr]    |                         ^^^^ help: consider using `_post` instead
Dec 12 03:04:10.862 INFO [stderr]    |
Dec 12 03:04:10.862 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:10.863 INFO [stderr] 
Dec 12 03:04:10.988 INFO [stderr] warning: unused variable: `six`
Dec 12 03:04:10.988 INFO [stderr]   --> src/enum.rs:20:7
Dec 12 03:04:10.988 INFO [stderr]    |
Dec 12 03:04:10.988 INFO [stderr] 20 |   let six = IpAddrKind::V6;
Dec 12 03:04:10.988 INFO [stderr]    |       ^^^ help: consider using `_six` instead
Dec 12 03:04:10.988 INFO [stderr]    |
Dec 12 03:04:10.988 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:10.988 INFO [stderr] 
Dec 12 03:04:10.988 INFO [stderr] warning: unused variable: `home`
Dec 12 03:04:10.988 INFO [stderr]   --> src/enum.rs:27:7
Dec 12 03:04:10.988 INFO [stderr]    |
Dec 12 03:04:10.988 INFO [stderr] 27 |   let home = IpAddr {
Dec 12 03:04:10.988 INFO [stderr]    |       ^^^^ help: consider using `_home` instead
Dec 12 03:04:10.988 INFO [stderr] 
Dec 12 03:04:10.989 INFO [stderr] warning: unused variable: `op_type`
Dec 12 03:04:10.989 INFO [stderr]   --> src/enum.rs:35:10
Dec 12 03:04:10.989 INFO [stderr]    |
Dec 12 03:04:10.989 INFO [stderr] 35 | fn route(op_type: IpAddrKind) { }
Dec 12 03:04:10.989 INFO [stderr]    |          ^^^^^^^ help: consider using `_op_type` instead
Dec 12 03:04:10.989 INFO [stderr] 
Dec 12 03:04:11.007 INFO [stderr] warning: field is never used: `kind`
Dec 12 03:04:11.007 INFO [stderr]   --> src/enum.rs:14:3
Dec 12 03:04:11.007 INFO [stderr]    |
Dec 12 03:04:11.007 INFO [stderr] 14 |   kind: IpAddrKind,
Dec 12 03:04:11.007 INFO [stderr]    |   ^^^^^^^^^^^^^^^^
Dec 12 03:04:11.032 INFO [stderr]    |
Dec 12 03:04:11.032 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 12 03:04:11.032 INFO [stderr] 
Dec 12 03:04:11.032 INFO [stderr] warning: field is never used: `address`
Dec 12 03:04:11.032 INFO [stderr]   --> src/enum.rs:15:3
Dec 12 03:04:11.032 INFO [stderr]    |
Dec 12 03:04:11.032 INFO [stderr] 15 |   address: String
Dec 12 03:04:11.033 INFO [stderr]    |   ^^^^^^^^^^^^^^^
Dec 12 03:04:11.033 INFO [stderr] 
Dec 12 03:04:13.456 INFO [stderr] warning: unused import: `std::time::Duration`
Dec 12 03:04:13.456 INFO [stderr]  --> src/multiple_thread.rs:2:5
Dec 12 03:04:13.456 INFO [stderr]   |
Dec 12 03:04:13.456 INFO [stderr] 2 | use std::time::Duration;
Dec 12 03:04:13.456 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^
Dec 12 03:04:13.456 INFO [stderr]   |
Dec 12 03:04:13.456 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 12 03:04:13.456 INFO [stderr] 
Dec 12 03:04:14.564 INFO [stderr] warning: unused variable: `integer`
Dec 12 03:04:14.564 INFO [stderr]   --> src/generics.rs:14:7
Dec 12 03:04:14.564 INFO [stderr]    |
Dec 12 03:04:14.565 INFO [stderr] 14 |   let integer = Point {
Dec 12 03:04:14.565 INFO [stderr]    |       ^^^^^^^ help: consider using `_integer` instead
Dec 12 03:04:14.565 INFO [stderr]    |
Dec 12 03:04:14.565 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:14.565 INFO [stderr] 
Dec 12 03:04:14.624 INFO [stderr] warning: field is never used: `y`
Dec 12 03:04:14.624 INFO [stderr]  --> src/generics.rs:3:3
Dec 12 03:04:14.624 INFO [stderr]   |
Dec 12 03:04:14.624 INFO [stderr] 3 |   y: T
Dec 12 03:04:14.624 INFO [stderr]   |   ^^^^
Dec 12 03:04:14.624 INFO [stderr]   |
Dec 12 03:04:14.624 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 12 03:04:14.624 INFO [stderr] 
Dec 12 03:04:14.720 INFO [stderr] warning: unused import: `std::rc::Rc`
Dec 12 03:04:14.720 INFO [stderr]  --> src/shared_mem.rs:1:5
Dec 12 03:04:14.720 INFO [stderr]   |
Dec 12 03:04:14.720 INFO [stderr] 1 | use std::rc::Rc;
Dec 12 03:04:14.720 INFO [stderr]   |     ^^^^^^^^^^^
Dec 12 03:04:14.720 INFO [stderr]   |
Dec 12 03:04:14.720 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 12 03:04:14.720 INFO [stderr] 
Dec 12 03:04:16.284 INFO [stderr] warning: unused variable: `six`
Dec 12 03:04:16.284 INFO [stderr]   --> src/match.rs:25:7
Dec 12 03:04:16.284 INFO [stderr]    |
Dec 12 03:04:16.284 INFO [stderr] 25 |   let six = plus_one(five);
Dec 12 03:04:16.284 INFO [stderr]    |       ^^^ help: consider using `_six` instead
Dec 12 03:04:16.284 INFO [stderr]    |
Dec 12 03:04:16.284 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:16.284 INFO [stderr] 
Dec 12 03:04:16.284 INFO [stderr] warning: unused variable: `none`
Dec 12 03:04:16.284 INFO [stderr]   --> src/match.rs:26:7
Dec 12 03:04:16.284 INFO [stderr]    |
Dec 12 03:04:16.284 INFO [stderr] 26 |   let none = plus_one(None);
Dec 12 03:04:16.284 INFO [stderr]    |       ^^^^ help: consider using `_none` instead
Dec 12 03:04:16.284 INFO [stderr] 
Dec 12 03:04:16.336 INFO [stderr] warning: variant is never constructed: `Penny`
Dec 12 03:04:16.336 INFO [stderr]  --> src/match.rs:2:3
Dec 12 03:04:16.336 INFO [stderr]   |
Dec 12 03:04:16.336 INFO [stderr] 2 |   Penny,
Dec 12 03:04:16.336 INFO [stderr]   |   ^^^^^
Dec 12 03:04:16.336 INFO [stderr]   |
Dec 12 03:04:16.336 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 12 03:04:16.336 INFO [stderr] 
Dec 12 03:04:16.336 INFO [stderr] warning: variant is never constructed: `Nickel`
Dec 12 03:04:16.336 INFO [stderr]  --> src/match.rs:3:3
Dec 12 03:04:16.336 INFO [stderr]   |
Dec 12 03:04:16.336 INFO [stderr] 3 |   Nickel,
Dec 12 03:04:16.336 INFO [stderr]   |   ^^^^^^
Dec 12 03:04:16.336 INFO [stderr] 
Dec 12 03:04:16.336 INFO [stderr] warning: variant is never constructed: `Dime`
Dec 12 03:04:16.336 INFO [stderr]  --> src/match.rs:4:3
Dec 12 03:04:16.336 INFO [stderr]   |
Dec 12 03:04:16.336 INFO [stderr] 4 |   Dime,
Dec 12 03:04:16.336 INFO [stderr]   |   ^^^^
Dec 12 03:04:16.336 INFO [stderr] 
Dec 12 03:04:16.336 INFO [stderr] warning: variant is never constructed: `Alabama`
Dec 12 03:04:16.336 INFO [stderr]   --> src/match.rs:10:3
Dec 12 03:04:16.336 INFO [stderr]    |
Dec 12 03:04:16.336 INFO [stderr] 10 |   Alabama,
Dec 12 03:04:16.336 INFO [stderr]    |   ^^^^^^^
Dec 12 03:04:16.336 INFO [stderr] 
Dec 12 03:04:16.412 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:04:16.412 INFO [stderr]  --> src/slice.rs:2:7
Dec 12 03:04:16.412 INFO [stderr]   |
Dec 12 03:04:16.412 INFO [stderr] 2 |   let mut s = String::from("hello world");
Dec 12 03:04:16.412 INFO [stderr]   |       ----^
Dec 12 03:04:16.412 INFO [stderr]   |       |
Dec 12 03:04:16.412 INFO [stderr]   |       help: remove this `mut`
Dec 12 03:04:16.424 INFO [stderr]   |
Dec 12 03:04:16.424 INFO [stderr]   = note: #[warn(unused_mut)] on by default
Dec 12 03:04:16.424 INFO [stderr] 
Dec 12 03:04:17.152 INFO [stderr] warning: field is never used: `query`
Dec 12 03:04:17.152 INFO [stderr]   --> src/read.rs:27:5
Dec 12 03:04:17.152 INFO [stderr]    |
Dec 12 03:04:17.152 INFO [stderr] 27 |     query: String,
Dec 12 03:04:17.152 INFO [stderr]    |     ^^^^^^^^^^^^^
Dec 12 03:04:17.152 INFO [stderr]    |
Dec 12 03:04:17.152 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 12 03:04:17.152 INFO [stderr] 
Dec 12 03:04:17.440 INFO [stderr] warning: unused variable: `six`
Dec 12 03:04:17.440 INFO [stderr]   --> src/enum.rs:20:7
Dec 12 03:04:17.440 INFO [stderr]    |
Dec 12 03:04:17.440 INFO [stderr] 20 |   let six = IpAddrKind::V6;
Dec 12 03:04:17.440 INFO [stderr]    |       ^^^ help: consider using `_six` instead
Dec 12 03:04:17.460 INFO [stderr]    |
Dec 12 03:04:17.464 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:17.464 INFO [stderr] 
Dec 12 03:04:17.464 INFO [stderr] warning: unused variable: `home`
Dec 12 03:04:17.464 INFO [stderr]   --> src/enum.rs:27:7
Dec 12 03:04:17.464 INFO [stderr]    |
Dec 12 03:04:17.464 INFO [stderr] 27 |   let home = IpAddr {
Dec 12 03:04:17.464 INFO [stderr]    |       ^^^^ help: consider using `_home` instead
Dec 12 03:04:17.464 INFO [stderr] 
Dec 12 03:04:17.464 INFO [stderr] warning: unused variable: `op_type`
Dec 12 03:04:17.464 INFO [stderr]   --> src/enum.rs:35:10
Dec 12 03:04:17.464 INFO [stderr]    |
Dec 12 03:04:17.464 INFO [stderr] 35 | fn route(op_type: IpAddrKind) { }
Dec 12 03:04:17.464 INFO [stderr]    |          ^^^^^^^ help: consider using `_op_type` instead
Dec 12 03:04:17.464 INFO [stderr] 
Dec 12 03:04:17.500 INFO [stderr] warning: field is never used: `kind`
Dec 12 03:04:17.500 INFO [stderr]   --> src/enum.rs:14:3
Dec 12 03:04:17.500 INFO [stderr]    |
Dec 12 03:04:17.500 INFO [stderr] 14 |   kind: IpAddrKind,
Dec 12 03:04:17.500 INFO [stderr]    |   ^^^^^^^^^^^^^^^^
Dec 12 03:04:17.500 INFO [stderr]    |
Dec 12 03:04:17.500 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 12 03:04:17.500 INFO [stderr] 
Dec 12 03:04:17.500 INFO [stderr] warning: field is never used: `address`
Dec 12 03:04:17.500 INFO [stderr]   --> src/enum.rs:15:3
Dec 12 03:04:17.500 INFO [stderr]    |
Dec 12 03:04:17.500 INFO [stderr] 15 |   address: String
Dec 12 03:04:17.500 INFO [stderr]    |   ^^^^^^^^^^^^^^^
Dec 12 03:04:17.500 INFO [stderr] 
Dec 12 03:04:18.256 INFO [stderr] warning: unused variable: `user2`
Dec 12 03:04:18.256 INFO [stderr]   --> src/struct.rs:14:7
Dec 12 03:04:18.256 INFO [stderr]    |
Dec 12 03:04:18.256 INFO [stderr] 14 |   let user2 = User {
Dec 12 03:04:18.256 INFO [stderr]    |       ^^^^^ help: consider using `_user2` instead
Dec 12 03:04:18.256 INFO [stderr]    |
Dec 12 03:04:18.256 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:18.256 INFO [stderr] 
Dec 12 03:04:18.256 INFO [stderr] warning: unused variable: `black`
Dec 12 03:04:18.256 INFO [stderr]   --> src/struct.rs:20:7
Dec 12 03:04:18.256 INFO [stderr]    |
Dec 12 03:04:18.256 INFO [stderr] 20 |   let black = Color(0, 0, 0);
Dec 12 03:04:18.256 INFO [stderr]    |       ^^^^^ help: consider using `_black` instead
Dec 12 03:04:18.256 INFO [stderr] 
Dec 12 03:04:18.276 INFO [stderr] warning: field is never used: `username`
Dec 12 03:04:18.276 INFO [stderr]  --> src/struct.rs:2:3
Dec 12 03:04:18.276 INFO [stderr]   |
Dec 12 03:04:18.276 INFO [stderr] 2 |   username: String,
Dec 12 03:04:18.276 INFO [stderr]   |   ^^^^^^^^^^^^^^^^
Dec 12 03:04:18.304 INFO [stderr]   |
Dec 12 03:04:18.304 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 12 03:04:18.304 INFO [stderr] 
Dec 12 03:04:18.304 INFO [stderr] warning: field is never used: `email`
Dec 12 03:04:18.304 INFO [stderr]  --> src/struct.rs:3:3
Dec 12 03:04:18.304 INFO [stderr]   |
Dec 12 03:04:18.304 INFO [stderr] 3 |   email: String,
Dec 12 03:04:18.304 INFO [stderr]   |   ^^^^^^^^^^^^^
Dec 12 03:04:18.304 INFO [stderr] 
Dec 12 03:04:18.304 INFO [stderr] warning: field is never used: `sign_in_count`
Dec 12 03:04:18.304 INFO [stderr]  --> src/struct.rs:4:3
Dec 12 03:04:18.304 INFO [stderr]   |
Dec 12 03:04:18.304 INFO [stderr] 4 |   sign_in_count: u64,
Dec 12 03:04:18.304 INFO [stderr]   |   ^^^^^^^^^^^^^^^^^^
Dec 12 03:04:18.304 INFO [stderr] 
Dec 12 03:04:18.304 INFO [stderr] warning: field is never used: `active`
Dec 12 03:04:18.304 INFO [stderr]  --> src/struct.rs:5:3
Dec 12 03:04:18.304 INFO [stderr]   |
Dec 12 03:04:18.304 INFO [stderr] 5 |   active: bool
Dec 12 03:04:18.304 INFO [stderr]   |   ^^^^^^^^^^^^
Dec 12 03:04:18.304 INFO [stderr] 
Dec 12 03:04:19.056 INFO [stderr] warning: unused variable: `s6`
Dec 12 03:04:19.056 INFO [stderr]   --> src/owner.rs:19:7
Dec 12 03:04:19.056 INFO [stderr]    |
Dec 12 03:04:19.056 INFO [stderr] 19 |   let s6 = s5;
Dec 12 03:04:19.056 INFO [stderr]    |       ^^ help: consider using `_s6` instead
Dec 12 03:04:19.072 INFO [stderr]    |
Dec 12 03:04:19.072 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 03:04:19.072 INFO [stderr] 
Dec 12 03:04:19.080 INFO [stderr] warning: function is never used: `gives_ownership`
Dec 12 03:04:19.080 INFO [stderr]   --> src/owner.rs:37:1
Dec 12 03:04:19.080 INFO [stderr]    |
Dec 12 03:04:19.080 INFO [stderr] 37 | fn gives_ownership() -> String {
Dec 12 03:04:19.080 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 03:04:19.088 INFO [stderr]    |
Dec 12 03:04:19.088 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 12 03:04:19.088 INFO [stderr] 
Dec 12 03:04:19.585 INFO [stderr] error[E0601]: `main` function not found in crate `refcall`
Dec 12 03:04:19.594 INFO [stderr]   |
Dec 12 03:04:19.594 INFO [stderr]   = note: consider adding a `main` function to `src/refcall.rs`
Dec 12 03:04:19.594 INFO [stderr] 
Dec 12 03:04:19.708 INFO [stderr] error: aborting due to previous error
Dec 12 03:04:19.740 INFO [stderr] 
Dec 12 03:04:19.740 INFO [stderr] For more information about this error, try `rustc --explain E0601`.
Dec 12 03:04:19.771 INFO [stderr] error: Could not compile `rust_learning`.
Dec 12 03:04:19.771 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 12 03:04:21.176 INFO [stderr] error: build failed
Dec 12 03:04:21.180 INFO [stderr] su: No module specific data is present
Dec 12 03:04:21.740 INFO running `"docker" "inspect" "c840eaab9616a815a26c36cabc4a942595b33552e2fcc8fe3d5e49128d254d4f"`
Dec 12 03:04:22.054 INFO running `"docker" "rm" "-f" "c840eaab9616a815a26c36cabc4a942595b33552e2fcc8fe3d5e49128d254d4f"`
Dec 12 03:04:22.360 INFO [stdout] c840eaab9616a815a26c36cabc4a942595b33552e2fcc8fe3d5e49128d254d4f