[INFO] cloning repository https://github.com/kvnvelasco/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kvnvelasco/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkvnvelasco%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkvnvelasco%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 32d9d127a88eefcdd05e9dc50cb90d8a29d217cd
[INFO] checking kvnvelasco/learning-rust against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkvnvelasco%2Flearning-rust" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kvnvelasco/learning-rust on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kvnvelasco/learning-rust
[INFO] finished tweaking git repo https://github.com/kvnvelasco/learning-rust
[INFO] tweaked toml for git repo https://github.com/kvnvelasco/learning-rust written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/kvnvelasco/learning-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1776ccd82bf14e89eed261133988eddce81e500e5c4485a19af716f17d8ae10d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1776ccd82bf14e89eed261133988eddce81e500e5c4485a19af716f17d8ae10d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1776ccd82bf14e89eed261133988eddce81e500e5c4485a19af716f17d8ae10d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1776ccd82bf14e89eed261133988eddce81e500e5c4485a19af716f17d8ae10d", kill_on_drop: false }`
[INFO] [stdout] 1776ccd82bf14e89eed261133988eddce81e500e5c4485a19af716f17d8ae10d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 538f9fcd0cbe5baae11b5c7e45d626d83146db2452109ed8617ca724f7be0df3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "538f9fcd0cbe5baae11b5c7e45d626d83146db2452109ed8617ca724f7be0df3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]    Compiling proc-macro-hack v0.5.15
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking bytes v0.5.4
[INFO] [stderr]     Checking pin-project-lite v0.1.4
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]     Checking threads v0.1.0 (/opt/rustwide/workdir/threads)
[INFO] [stderr]     Checking syscalls v0.1.0 (/opt/rustwide/workdir/syscalls)
[INFO] [stderr]     Checking learn-rust v0.1.0 (/opt/rustwide/workdir/dynamic-programming)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> threads/src/main.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |         thread.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> threads/src/main.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |         thread.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking threaded-tcp-server v0.1.0 (/opt/rustwide/workdir/threaded-tcp-server)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> threaded-tcp-server/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> threaded-tcp-server/src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read_size`
[INFO] [stdout]   --> threaded-tcp-server/src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let read_size = stream.read(&mut buffer).unwrap();
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_read_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `request`
[INFO] [stdout]   --> threaded-tcp-server/src/main.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let request = {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_request`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> threaded-tcp-server/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> threaded-tcp-server/src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read_size`
[INFO] [stdout]   --> threaded-tcp-server/src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let read_size = stream.read(&mut buffer).unwrap();
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_read_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `request`
[INFO] [stdout]   --> threaded-tcp-server/src/main.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let request = {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_request`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> threaded-tcp-server/src/main.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |         req.parse(&buffer);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> threaded-tcp-server/src/main.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |         req.parse(&buffer);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]     Checking ffi v0.1.0 (/opt/rustwide/workdir/ffi)
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stdout] warning: unused imports: `c_int`, `c_longlong`, `c_uchar`
[INFO] [stdout]  --> ffi/src/main.rs:5:32
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::os::raw::{c_char, c_int, c_longlong, c_uchar};
[INFO] [stdout]   |                                ^^^^^  ^^^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `c_int`, `c_longlong`, `c_uchar`
[INFO] [stdout]  --> ffi/src/main.rs:5:32
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::os::raw::{c_char, c_int, c_longlong, c_uchar};
[INFO] [stdout]   |                                ^^^^^  ^^^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Done`
[INFO] [stdout]   --> ffi/src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Done = 0,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Delta`
[INFO] [stdout]   --> ffi/src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Delta = 0x72730236,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Blake2Hash`
[INFO] [stdout]   --> ffi/src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Blake2Hash = 0x72730137,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `RsyncStats`, which is not FFI-safe
[INFO] [stdout]   --> ffi/src/main.rs:35:20
[INFO] [stdout]    |
[INFO] [stdout] 35 |             stats: *mut RsyncStats,
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stdout]    = help: consider adding a member to this struct
[INFO] [stdout]    = note: this struct has no fields
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]   --> ffi/src/main.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub struct RsyncStats {}
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Done`
[INFO] [stdout]   --> ffi/src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Done = 0,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Delta`
[INFO] [stdout]   --> ffi/src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         Delta = 0x72730236,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Blake2Hash`
[INFO] [stdout]   --> ffi/src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Blake2Hash = 0x72730137,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `RsyncStats`, which is not FFI-safe
[INFO] [stdout]   --> ffi/src/main.rs:35:20
[INFO] [stdout]    |
[INFO] [stdout] 35 |             stats: *mut RsyncStats,
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stdout]    = help: consider adding a member to this struct
[INFO] [stdout]    = note: this struct has no fields
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]   --> ffi/src/main.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub struct RsyncStats {}
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking tokio v0.2.16
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking futures_reimpl v0.1.0 (/opt/rustwide/workdir/futures_reimpl)
[INFO] [stdout] warning: unused import: `Poll`
[INFO] [stdout]   --> futures_reimpl/src/main.rs:32:54
[INFO] [stdout]    |
[INFO] [stdout] 32 |     use futures::task::{waker_ref, ArcWake, Context, Poll};
[INFO] [stdout]    |                                                      ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BorrowMut`
[INFO] [stdout]  --> futures_reimpl/src/timer.rs:3:27
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::borrow::{Borrow, BorrowMut};
[INFO] [stdout]   |                           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SystemTime`
[INFO] [stdout]  --> futures_reimpl/src/timer.rs:7:36
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::time::{Duration, Instant, SystemTime};
[INFO] [stdout]   |                                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `while let` pattern
[INFO] [stdout]   --> futures_reimpl/src/main.rs:41:13
[INFO] [stdout]    |
[INFO] [stdout] 41 | /             while let task = self.queue.recv().expect("Unable to get task") {
[INFO] [stdout] 42 | |                 let mut future_slot: MutexGuard<Option<BoxFuture<()>>> = task
[INFO] [stdout] 43 | |                     .current_future
[INFO] [stdout] 44 | |                     .lock()
[INFO] [stdout] ...  |
[INFO] [stdout] 53 | |                 }
[INFO] [stdout] 54 | |             }
[INFO] [stdout]    | |_____________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]    = note: this pattern will always match, so the loop will never exit
[INFO] [stdout]    = help: consider instead using a `loop { ... }` with a `let` inside it
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `time`
[INFO] [stdout]   --> futures_reimpl/src/main.rs:17:17
[INFO] [stdout]    |
[INFO] [stdout] 17 |             let time = SystemTime::now();
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> futures_reimpl/src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     for i in 0..=100_000 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `thread_count`
[INFO] [stdout]   --> futures_reimpl/src/main.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |         let thread_count = thread_count.clone();
[INFO] [stdout]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_thread_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Poll`
[INFO] [stdout]   --> futures_reimpl/src/main.rs:32:54
[INFO] [stdout]    |
[INFO] [stdout] 32 |     use futures::task::{waker_ref, ArcWake, Context, Poll};
[INFO] [stdout]    |                                                      ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BorrowMut`
[INFO] [stdout]  --> futures_reimpl/src/timer.rs:3:27
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::borrow::{Borrow, BorrowMut};
[INFO] [stdout]   |                           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SystemTime`
[INFO] [stdout]  --> futures_reimpl/src/timer.rs:7:36
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::time::{Duration, Instant, SystemTime};
[INFO] [stdout]   |                                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> futures_reimpl/src/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     main.join();
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> futures_reimpl/src/main.rs:82:13
[INFO] [stdout]    |
[INFO] [stdout] 82 |             arc_self.requeue_handle.send(arc_self.clone());
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `while let` pattern
[INFO] [stdout]   --> futures_reimpl/src/main.rs:41:13
[INFO] [stdout]    |
[INFO] [stdout] 41 | /             while let task = self.queue.recv().expect("Unable to get task") {
[INFO] [stdout] 42 | |                 let mut future_slot: MutexGuard<Option<BoxFuture<()>>> = task
[INFO] [stdout] 43 | |                     .current_future
[INFO] [stdout] 44 | |                     .lock()
[INFO] [stdout] ...  |
[INFO] [stdout] 53 | |                 }
[INFO] [stdout] 54 | |             }
[INFO] [stdout]    | |_____________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]    = note: this pattern will always match, so the loop will never exit
[INFO] [stdout]    = help: consider instead using a `loop { ... }` with a `let` inside it
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `time`
[INFO] [stdout]   --> futures_reimpl/src/main.rs:17:17
[INFO] [stdout]    |
[INFO] [stdout] 17 |             let time = SystemTime::now();
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> futures_reimpl/src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     for i in 0..=100_000 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `thread_count`
[INFO] [stdout]   --> futures_reimpl/src/main.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |         let thread_count = thread_count.clone();
[INFO] [stdout]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_thread_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> futures_reimpl/src/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     main.join();
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> futures_reimpl/src/main.rs:82:13
[INFO] [stdout]    |
[INFO] [stdout] 82 |             arc_self.requeue_handle.send(arc_self.clone());
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tokio v0.1.0 (/opt/rustwide/workdir/tokio)
[INFO] [stdout] warning: unused import: `tokio::fs`
[INFO] [stdout]  --> tokio/src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::fs;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude::*`
[INFO] [stdout]  --> tokio/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use tokio::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::fs`
[INFO] [stdout]  --> tokio/src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::fs;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::prelude::*`
[INFO] [stdout]  --> tokio/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use tokio::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 0 that must be used
[INFO] [stdout]   --> tokio/src/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     runtime.block_on(futures::future::join(handle1, handle2));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 1 that must be used
[INFO] [stdout]   --> tokio/src/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     runtime.block_on(futures::future::join(handle1, handle2));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 0 that must be used
[INFO] [stdout]   --> tokio/src/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     runtime.block_on(futures::future::join(handle1, handle2));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 1 that must be used
[INFO] [stdout]   --> tokio/src/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     runtime.block_on(futures::future::join(handle1, handle2));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 38.46s
[INFO] running `Command { std: "docker" "inspect" "538f9fcd0cbe5baae11b5c7e45d626d83146db2452109ed8617ca724f7be0df3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "538f9fcd0cbe5baae11b5c7e45d626d83146db2452109ed8617ca724f7be0df3", kill_on_drop: false }`
[INFO] [stdout] 538f9fcd0cbe5baae11b5c7e45d626d83146db2452109ed8617ca724f7be0df3