[INFO] updating cached repository EdenCao/rust_learning
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/EdenCao/rust_learning
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/EdenCao/rust_learning" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/EdenCao/rust_learning"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/EdenCao/rust_learning'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/EdenCao/rust_learning" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/EdenCao/rust_learning"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/EdenCao/rust_learning'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3b85aa524f292dd7b9939ed7d5de8b6456618f9f
[INFO] sha for GitHub repo EdenCao/rust_learning: 3b85aa524f292dd7b9939ed7d5de8b6456618f9f
[INFO] validating manifest of EdenCao/rust_learning on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of EdenCao/rust_learning on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing EdenCao/rust_learning
[INFO] finished frobbing EdenCao/rust_learning
[INFO] frobbed toml for EdenCao/rust_learning written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/EdenCao/rust_learning/Cargo.toml
[INFO] started frobbing EdenCao/rust_learning
[INFO] finished frobbing EdenCao/rust_learning
[INFO] frobbed toml for EdenCao/rust_learning written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/EdenCao/rust_learning/Cargo.toml
[INFO] crate EdenCao/rust_learning already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking EdenCao/rust_learning against try#06a150c7d11500b41499224f165e9de1de096768 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-1/try#06a150c7d11500b41499224f165e9de1de096768:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/EdenCao/rust_learning:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 66ca6d842e69a4fd1584f510bc7a0d9a2ab84a0bb28c46d6d6c75980c148e67a
[INFO] running `"docker" "start" "-a" "66ca6d842e69a4fd1584f510bc7a0d9a2ab84a0bb28c46d6d6c75980c148e67a"`
[INFO] [stderr]     Checking rust_learning v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `s6`
[INFO] [stderr]   --> src/owner.rs:19:7
[INFO] [stderr]    |
[INFO] [stderr] 19 |   let s6 = s5;
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_s6`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gives_ownership`
[INFO] [stderr]   --> src/owner.rs:37:1
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn gives_ownership() -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/shared_mem.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]  --> src/multiple_thread.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::time::Duration;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/struct.rs:14:7
[INFO] [stderr]    |
[INFO] [stderr] 14 |   let user2 = User {
[INFO] [stderr]    |       ^^^^^ help: consider prefixing with an underscore: `_user2`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `black`
[INFO] [stderr]   --> src/struct.rs:20:7
[INFO] [stderr]    |
[INFO] [stderr] 20 |   let black = Color(0, 0, 0);
[INFO] [stderr]    |       ^^^^^ help: consider prefixing with an underscore: `_black`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `username`
[INFO] [stderr]  --> src/struct.rs:2:3
[INFO] [stderr]   |
[INFO] [stderr] 2 |   username: String,
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `email`
[INFO] [stderr]  --> src/struct.rs:3:3
[INFO] [stderr]   |
[INFO] [stderr] 3 |   email: String,
[INFO] [stderr]   |   ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `sign_in_count`
[INFO] [stderr]  --> src/struct.rs:4:3
[INFO] [stderr]   |
[INFO] [stderr] 4 |   sign_in_count: u64,
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `active`
[INFO] [stderr]  --> src/struct.rs:5:3
[INFO] [stderr]   |
[INFO] [stderr] 5 |   active: bool
[INFO] [stderr]   |   ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `post`
[INFO] [stderr]   --> src/blog.rs:30:25
[INFO] [stderr]    |
[INFO] [stderr] 30 |   fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stderr]    |                         ^^^^ help: consider prefixing with an underscore: `_post`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/match.rs:25:7
[INFO] [stderr]    |
[INFO] [stderr] 25 |   let six = plus_one(five);
[INFO] [stderr]    |       ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/match.rs:26:7
[INFO] [stderr]    |
[INFO] [stderr] 26 |   let none = plus_one(None);
[INFO] [stderr]    |       ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Penny`
[INFO] [stderr]  --> src/match.rs:2:3
[INFO] [stderr]   |
[INFO] [stderr] 2 |   Penny,
[INFO] [stderr]   |   ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]  --> src/match.rs:3:3
[INFO] [stderr]   |
[INFO] [stderr] 3 |   Nickel,
[INFO] [stderr]   |   ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]  --> src/match.rs:4:3
[INFO] [stderr]   |
[INFO] [stderr] 4 |   Dime,
[INFO] [stderr]   |   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]   --> src/match.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   Alabama,
[INFO] [stderr]    |   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `refcall`
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider adding a `main` function to `src/refcall.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: Could not compile `rust_learning`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/shared_mem.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `query`
[INFO] [stderr]   --> src/read.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 |     query: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `search_case_insensitive`
[INFO] [stderr]   --> src/read.rs:82:1
[INFO] [stderr]    |
[INFO] [stderr] 82 | fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `integer`
[INFO] [stderr]   --> src/generics.rs:14:7
[INFO] [stderr]    |
[INFO] [stderr] 14 |   let integer = Point {
[INFO] [stderr]    |       ^^^^^^^ help: consider prefixing with an underscore: `_integer`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `y`
[INFO] [stderr]  --> src/generics.rs:3:3
[INFO] [stderr]   |
[INFO] [stderr] 3 |   y: T
[INFO] [stderr]   |   ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `count` is assigned to, but never used
[INFO] [stderr]   --> src/iflet.rs:20:11
[INFO] [stderr]    |
[INFO] [stderr] 20 |   let mut count = 0;
[INFO] [stderr]    |           ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr]    = note: consider using `_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]   --> src/iflet.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     count += 1;
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Penny`
[INFO] [stderr]  --> src/iflet.rs:2:3
[INFO] [stderr]   |
[INFO] [stderr] 2 |   Penny,
[INFO] [stderr]   |   ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]  --> src/iflet.rs:3:3
[INFO] [stderr]   |
[INFO] [stderr] 3 |   Nickel,
[INFO] [stderr]   |   ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]  --> src/iflet.rs:4:3
[INFO] [stderr]   |
[INFO] [stderr] 4 |   Dime,
[INFO] [stderr]   |   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]   --> src/iflet.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   Alabama,
[INFO] [stderr]    |   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `query`
[INFO] [stderr]   --> src/read.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 |     query: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/match.rs:25:7
[INFO] [stderr]    |
[INFO] [stderr] 25 |   let six = plus_one(five);
[INFO] [stderr]    |       ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/match.rs:26:7
[INFO] [stderr]    |
[INFO] [stderr] 26 |   let none = plus_one(None);
[INFO] [stderr]    |       ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Penny`
[INFO] [stderr]  --> src/match.rs:2:3
[INFO] [stderr]   |
[INFO] [stderr] 2 |   Penny,
[INFO] [stderr]   |   ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]  --> src/match.rs:3:3
[INFO] [stderr]   |
[INFO] [stderr] 3 |   Nickel,
[INFO] [stderr]   |   ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]  --> src/match.rs:4:3
[INFO] [stderr]   |
[INFO] [stderr] 4 |   Dime,
[INFO] [stderr]   |   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]   --> src/match.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   Alabama,
[INFO] [stderr]    |   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/slice.rs:2:7
[INFO] [stderr]   |
[INFO] [stderr] 2 |   let mut s = String::from("hello world");
[INFO] [stderr]   |       ----^
[INFO] [stderr]   |       |
[INFO] [stderr]   |       help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]  --> src/multiple_thread.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::time::Duration;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "66ca6d842e69a4fd1584f510bc7a0d9a2ab84a0bb28c46d6d6c75980c148e67a"`
[INFO] running `"docker" "rm" "-f" "66ca6d842e69a4fd1584f510bc7a0d9a2ab84a0bb28c46d6d6c75980c148e67a"`
[INFO] [stdout] 66ca6d842e69a4fd1584f510bc7a0d9a2ab84a0bb28c46d6d6c75980c148e67a