[INFO] cloning repository https://github.com/voratham/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/voratham/learn-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvoratham%2Flearn-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvoratham%2Flearn-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5dd4a1ecf069c8c16583bbb064bd64bfeb1817f8
[INFO] checking voratham/learn-rust against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvoratham%2Flearn-rust" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/voratham/learn-rust
[INFO] finished tweaking git repo https://github.com/voratham/learn-rust
[INFO] tweaked toml for git repo https://github.com/voratham/learn-rust written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/voratham/learn-rust on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/voratham/learn-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "722f6e3ff2846c3914f1335f739f6ebc4a5d754be4d6ea33ff5a7e788e728116", kill_on_drop: false }`
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[INFO] [stderr]     Checking workers2 v0.1.0 (/opt/rustwide/workdir/session2/workers2)
[INFO] [stderr]     Checking affinity v0.1.0 (/opt/rustwide/workdir/session2/affinity)
[INFO] [stderr]     Checking tracing-subscriber v0.3.18
[INFO] [stderr]     Checking libc_malloc v0.1.0 (/opt/rustwide/workdir/session4/libc_malloc)
[INFO] [stdout] warning: function `allocate_memory_with_libc` is never used
[INFO] [stdout]  --> session4/libc_malloc/src/main.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn allocate_memory_with_libc() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rwlocks v0.1.0 (/opt/rustwide/workdir/session2/rwlocks)
[INFO] [stderr]     Checking tprio v0.1.0 (/opt/rustwide/workdir/session2/tprio)
[INFO] [stdout] warning: function `allocate_memory_with_libc` is never used
[INFO] [stdout]  --> session4/libc_malloc/src/main.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn allocate_memory_with_libc() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking channels1 v0.1.0 (/opt/rustwide/workdir/session2/channels1)
[INFO] [stdout] warning: static `HIGH_COUNT` is never used
[INFO] [stdout]  --> session2/tprio/src/main.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | static HIGH_COUNT: AtomicI32 = AtomicI32::new(0);
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking deadlocks v0.1.0 (/opt/rustwide/workdir/session2/deadlocks)
[INFO] [stderr]     Checking footgun v0.1.0 (/opt/rustwide/workdir/session2/footgun)
[INFO] [stderr]     Checking dashing v0.1.0 (/opt/rustwide/workdir/session2/dashing)
[INFO] [stdout] warning: static `HIGH_COUNT` is never used
[INFO] [stdout]  --> session2/tprio/src/main.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | static HIGH_COUNT: AtomicI32 = AtomicI32::new(0);
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking workers v0.1.0 (/opt/rustwide/workdir/session2/workers)
[INFO] [stderr]     Checking parking v0.1.0 (/opt/rustwide/workdir/session2/parking)
[INFO] [stderr]     Checking hello-world v0.1.0 (/opt/rustwide/workdir/session2/hello-world)
[INFO] [stderr]     Checking dropping_smart_pointer v0.1.0 (/opt/rustwide/workdir/session4/dropping_smart_pointer)
[INFO] [stdout] warning: unused variable: `job`
[INFO] [stdout]   --> session2/workers/src/main.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let job = || println!("Hello from a closure");
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_job`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `job2`
[INFO] [stdout]   --> session2/workers/src/main.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let job2 = || {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_job2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking dropping v0.1.0 (/opt/rustwide/workdir/session4/dropping)
[INFO] [stdout] warning: function `hi_there` is never used
[INFO] [stdout]   --> session2/workers/src/main.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn hi_there() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello_thread` is never used
[INFO] [stdout]  --> session2/hello-world/src/main.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn hello_thread(n: u32) {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::str`
[INFO] [stdout]  --> session4/dropping/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::str;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> session2/workers/src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     tx.send(Command::Quit);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let _ = tx.send(Command::Quit);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking learn-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> session4/dropping/src/main.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let y = MyStruct::new(2);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `has_drop`
[INFO] [stdout]   --> session4/dropping/src/main.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let has_drop = HasDroppables {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_has_drop`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `x` is never read
[INFO] [stdout]   --> session4/dropping/src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct HasDroppables {
[INFO] [stdout]    |        ------------- field in this struct
[INFO] [stdout] 21 |     x: MyStruct,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking divide_work v0.1.0 (/opt/rustwide/workdir/session2/divide_work)
[INFO] [stderr]     Checking variable v0.1.0 (/opt/rustwide/workdir/session1/variable)
[INFO] [stderr]     Checking smartpointer v0.1.0 (/opt/rustwide/workdir/session4/smartpointer)
[INFO] [stderr]     Checking memory v0.1.0 (/opt/rustwide/workdir/session4/memory)
[INFO] [stderr]     Checking thread_builder v0.1.0 (/opt/rustwide/workdir/session2/thread_builder)
[INFO] [stdout] warning: function `double` is never used
[INFO] [stdout]  --> session1/variable/src/main.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn double(n: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `double_or_nothing` is never used
[INFO] [stdout]  --> session1/variable/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn double_or_nothing(n: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet` is never used
[INFO] [stdout]   --> session1/variable/src/main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn greet(s: String) -> String {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet_borrow` is never used
[INFO] [stdout]   --> session1/variable/src/main.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn greet_borrow(s: &String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet_borrow_mut` is never used
[INFO] [stdout]   --> session1/variable/src/main.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn greet_borrow_mut(s: &mut String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::str`
[INFO] [stdout]  --> session4/dropping/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::str;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> session4/dropping/src/main.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let y = MyStruct::new(2);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `has_drop`
[INFO] [stdout]   --> session4/dropping/src/main.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let has_drop = HasDroppables {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_has_drop`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `x` is never read
[INFO] [stdout]   --> session4/dropping/src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct HasDroppables {
[INFO] [stdout]    |        ------------- field in this struct
[INFO] [stdout] 21 |     x: MyStruct,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking mutexes v0.1.0 (/opt/rustwide/workdir/session2/mutexes)
[INFO] [stdout] warning: unused variable: `my_vec_in_case_error`
[INFO] [stdout]   --> session4/memory/src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let my_vec_in_case_error = Vec::<u32>::new();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_vec_in_case_error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `get_index`
[INFO] [stdout]   --> session4/memory/src/main.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let get_index = my_vec.get_unchecked(2);
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_get_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> session4/memory/src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `my_fn` is never used
[INFO] [stdout]  --> session4/memory/src/main.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | unsafe fn my_fn() {}
[INFO] [stdout]   |           ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> session4/smartpointer/src/main.rs:48:24
[INFO] [stdout]    |
[INFO] [stdout] 48 |     *v2.borrow_mut() = Box::new(20); // changed value v2
[INFO] [stdout]    |     ----------------   ^^^^^^^^^^^^ expected integer, found `Box<{integer}>`
[INFO] [stdout]    |     |
[INFO] [stdout]    |     expected due to the type of this binding
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected type `{integer}`
[INFO] [stdout]             found struct `Box<{integer}>`
[INFO] [stdout] help: consider unboxing the value
[INFO] [stdout]    |
[INFO] [stdout] 48 |     *v2.borrow_mut() = *Box::new(20); // changed value v2
[INFO] [stdout]    |                        +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr]    Compiling futures-executor v0.3.30
[INFO] [stderr] error: could not compile `smartpointer` (bin "smartpointer" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: function `double` is never used
[INFO] [stdout]  --> session1/variable/src/main.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn double(n: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `double_or_nothing` is never used
[INFO] [stdout]  --> session1/variable/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn double_or_nothing(n: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet` is never used
[INFO] [stdout]   --> session1/variable/src/main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn greet(s: String) -> String {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet_borrow` is never used
[INFO] [stdout]   --> session1/variable/src/main.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn greet_borrow(s: &String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet_borrow_mut` is never used
[INFO] [stdout]   --> session1/variable/src/main.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn greet_borrow_mut(s: &mut String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "68f24d29df4f6fc128a127c49c673372ea27c2440984008438e13f7d4486f8dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68f24d29df4f6fc128a127c49c673372ea27c2440984008438e13f7d4486f8dd", kill_on_drop: false }`
[INFO] [stdout] 68f24d29df4f6fc128a127c49c673372ea27c2440984008438e13f7d4486f8dd