[INFO] fetching crate mco 0.1.44...
[INFO] checking mco-0.1.44 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate mco 0.1.44 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate mco 0.1.44 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mco 0.1.44
[INFO] finished tweaking crates.io crate mco 0.1.44
[INFO] tweaked toml for crates.io crate mco 0.1.44 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 66 packages
[INFO] [stderr]       Adding bitflags v1.2.1 (latest: v2.5.0)
[INFO] [stderr]       Adding memoffset v0.6.5 (latest: v0.9.1)
[INFO] [stderr]       Adding miow v0.3.7 (latest: v0.6.0)
[INFO] [stderr]       Adding nix v0.21.2 (latest: v0.28.0)
[INFO] [stderr]       Adding parking_lot v0.11.2 (latest: v0.12.1)
[INFO] [stderr]       Adding parking_lot_core v0.8.6 (latest: v0.9.9)
[INFO] [stderr]       Adding rand v0.4.6 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_core v0.3.1 (latest: v0.6.4)
[INFO] [stderr]       Adding rand_core v0.4.2 (latest: v0.6.4)
[INFO] [stderr]       Adding rdrand v0.4.0 (latest: v0.8.3)
[INFO] [stderr]       Adding redox_syscall v0.2.16 (latest: v0.5.1)
[INFO] [stderr]       Adding remove_dir_all v0.5.3 (latest: v0.8.2)
[INFO] [stderr]       Adding socket2 v0.4.10 (latest: v0.5.6)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nix v0.21.2
[INFO] [stderr]   Downloaded mco-gen v0.1.1
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b4a9ad8fcd5fa939455627840ac839f0a51b49d96a90d0d6b2eabef0e9bdc6ae
[INFO] running `Command { std: "docker" "start" "-a" "b4a9ad8fcd5fa939455627840ac839f0a51b49d96a90d0d6b2eabef0e9bdc6ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4a9ad8fcd5fa939455627840ac839f0a51b49d96a90d0d6b2eabef0e9bdc6ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4a9ad8fcd5fa939455627840ac839f0a51b49d96a90d0d6b2eabef0e9bdc6ae", kill_on_drop: false }`
[INFO] [stdout] b4a9ad8fcd5fa939455627840ac839f0a51b49d96a90d0d6b2eabef0e9bdc6ae
[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_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] beae63b90a1fbe165017aa39d5b5af889a559107ef0d823af49cb394e52e3a6f
[INFO] running `Command { std: "docker" "start" "-a" "beae63b90a1fbe165017aa39d5b5af889a559107ef0d823af49cb394e52e3a6f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]    Compiling parking_lot_core v0.8.6
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking instant v0.1.12
[INFO] [stderr]     Checking num-conv v0.1.0
[INFO] [stderr]     Checking num_threads v0.1.7
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-queue v0.3.11
[INFO] [stderr]     Checking crossbeam-channel v0.5.12
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
[INFO] [stderr]    Compiling mco-gen v0.1.1
[INFO] [stderr]    Compiling mco v0.1.44 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking crossbeam v0.8.4
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking nix v0.21.2
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking socket2 v0.4.10
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking deranged v0.3.11
[INFO] [stderr]     Checking time v0.3.34
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]   --> src/lib.rs:26:30
[INFO] [stdout]    |
[INFO] [stdout] 26 | #![cfg_attr(nightly, feature(core_intrinsics))]
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: using it is strongly discouraged
[INFO] [stdout]    = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `smallvec::SmallVec`
[INFO] [stdout]   --> src/io/sys/unix/epoll.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use smallvec::SmallVec;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/tcp_listener_accpet.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/udp_recv_from.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/udp_send_to.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/unix_recv_from.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/unix_send_to.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/std/time/sys/unix.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | use libc::{self, time_t};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `SyncMapImpl` in the type namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `SyncMapImpl` in the type namespace is also re-exported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(ambiguous_glob_reexports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `change_lifetime_const` in the value namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `change_lifetime_const` in the value namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `change_lifetime_mut` in the value namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `change_lifetime_mut` in the value namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `SyncMapRefMut` in the type namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `SyncMapRefMut` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `Iter` in the type namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `Iter` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `IterMut` in the type namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `IterMut` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]   --> src/lib.rs:26:30
[INFO] [stdout]    |
[INFO] [stdout] 26 | #![cfg_attr(nightly, feature(core_intrinsics))]
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: using it is strongly discouraged
[INFO] [stdout]    = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arc` is imported redundantly
[INFO] [stdout]    --> src/timeout_list.rs:327:9
[INFO] [stdout]     |
[INFO] [stdout] 326 |     use super::*;
[INFO] [stdout]     |         -------- the item `Arc` is already imported here
[INFO] [stdout] 327 |     use std::sync::Arc;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thread` is imported redundantly
[INFO] [stdout]    --> src/timeout_list.rs:328:9
[INFO] [stdout]     |
[INFO] [stdout] 326 |     use super::*;
[INFO] [stdout]     |         -------- the item `thread` is already imported here
[INFO] [stdout] 327 |     use std::sync::Arc;
[INFO] [stdout] 328 |     use std::thread;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/timeout_list.rs:329:9
[INFO] [stdout]     |
[INFO] [stdout] 326 |     use super::*;
[INFO] [stdout]     |         -------- the item `Duration` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 329 |     use std::time::Duration;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `smallvec::SmallVec`
[INFO] [stdout]   --> src/io/sys/unix/epoll.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use smallvec::SmallVec;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/tcp_listener_accpet.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/udp_recv_from.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/udp_send_to.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/unix_recv_from.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/io/sys/unix/net/unix_send_to.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{self, io};
[INFO] [stdout]   |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `io` is imported redundantly
[INFO] [stdout]     --> src/os/unix/net.rs:1094:9
[INFO] [stdout]      |
[INFO] [stdout] 1094 |     use std::io;
[INFO] [stdout]      |         ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1099 |     use super::*;
[INFO] [stdout]      |         -------- the item `io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]     --> src/os/unix/net.rs:1096:9
[INFO] [stdout]      |
[INFO] [stdout] 1096 |     use std::time::Duration;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1099 |     use super::*;
[INFO] [stdout]      |         -------- the item `Duration` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thread` is imported redundantly
[INFO] [stdout]    --> src/std/queue/mpsc_list.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 122 |     use super::*;
[INFO] [stdout]     |         -------- the item `thread` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 125 |     use std::thread;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thread` is imported redundantly
[INFO] [stdout]    --> src/std/queue/mpsc_list_v1.rs:354:9
[INFO] [stdout]     |
[INFO] [stdout] 351 |     use super::*;
[INFO] [stdout]     |         -------- the item `thread` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 354 |     use std::thread;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `AtomicUsize` is imported redundantly
[INFO] [stdout]    --> src/std/sync/mutex.rs:255:29
[INFO] [stdout]     |
[INFO] [stdout] 252 |     use super::*;
[INFO] [stdout]     |         -------- the item `AtomicUsize` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 255 |     use std::sync::atomic::{AtomicUsize, Ordering};
[INFO] [stdout]     |                             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Ordering` is imported redundantly
[INFO] [stdout]    --> src/std/sync/mutex.rs:255:42
[INFO] [stdout]     |
[INFO] [stdout] 252 |     use super::*;
[INFO] [stdout]     |         -------- the item `Ordering` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 255 |     use std::sync::atomic::{AtomicUsize, Ordering};
[INFO] [stdout]     |                                          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arc` is imported redundantly
[INFO] [stdout]    --> src/std/sync/mutex.rs:256:9
[INFO] [stdout]     |
[INFO] [stdout] 252 |     use super::*;
[INFO] [stdout]     |         -------- the item `Arc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 256 |     use std::sync::Arc;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `defer`
[INFO] [stdout]   --> src/std/sync/once.rs:56:23
[INFO] [stdout]    |
[INFO] [stdout] 56 |     use crate::{chan, defer};
[INFO] [stdout]    |                       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arc` is imported redundantly
[INFO] [stdout]    --> src/std/sync/semphore.rs:179:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     use super::*;
[INFO] [stdout]     |         -------- the item `Arc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 179 |     use std::sync::Arc;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/std/sync/semphore.rs:181:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     use super::*;
[INFO] [stdout]     |         -------- the item `Duration` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 181 |     use std::time::Duration;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arc` is imported redundantly
[INFO] [stdout]    --> src/std/sync/sync_flag.rs:158:9
[INFO] [stdout]     |
[INFO] [stdout] 157 |     use super::*;
[INFO] [stdout]     |         -------- the item `Arc` is already imported here
[INFO] [stdout] 158 |     use std::sync::Arc;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/std/sync/sync_flag.rs:160:9
[INFO] [stdout]     |
[INFO] [stdout] 157 |     use super::*;
[INFO] [stdout]     |         -------- the item `Duration` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 160 |     use std::time::Duration;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RecvTimeoutError` is imported redundantly
[INFO] [stdout]    --> src/std/sync/channel.rs:437:27
[INFO] [stdout]     |
[INFO] [stdout] 433 |     use super::*;
[INFO] [stdout]     |         -------- the item `RecvTimeoutError` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 437 |     use std::sync::mpsc::{RecvTimeoutError, TryRecvError};
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryRecvError` is imported redundantly
[INFO] [stdout]    --> src/std/sync/channel.rs:437:45
[INFO] [stdout]     |
[INFO] [stdout] 433 |     use super::*;
[INFO] [stdout]     |         -------- the item `TryRecvError` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 437 |     use std::sync::mpsc::{RecvTimeoutError, TryRecvError};
[INFO] [stdout]     |                                             ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/std/sync/channel.rs:439:9
[INFO] [stdout]     |
[INFO] [stdout] 433 |     use super::*;
[INFO] [stdout]     |         -------- the item `Duration` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 439 |     use std::time::Duration;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TryStream`
[INFO] [stdout]   --> src/std/io/stream_chan.rs:46:38
[INFO] [stdout]    |
[INFO] [stdout] 46 |     use crate::std::io::{ChanStream, TryStream};
[INFO] [stdout]    |                                      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::ControlFlow`
[INFO] [stdout]   --> src/std/io/stream_chan.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     use std::ops::ControlFlow;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/std/time/sys/unix.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | use libc::{self, time_t};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::BTreeMap`
[INFO] [stdout]    --> src/std/map/btree_map.rs:446:9
[INFO] [stdout]     |
[INFO] [stdout] 446 |     use std::collections::BTreeMap;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::atomic::Ordering`
[INFO] [stdout]    --> src/std/map/btree_map.rs:448:9
[INFO] [stdout]     |
[INFO] [stdout] 448 |     use std::sync::atomic::Ordering;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::sleep`
[INFO] [stdout]    --> src/std/map/hash_map.rs:458:9
[INFO] [stdout]     |
[INFO] [stdout] 458 |     use crate::sleep;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]    --> src/std/map/hash_map.rs:461:9
[INFO] [stdout]     |
[INFO] [stdout] 461 |     use std::collections::HashMap;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::atomic::Ordering`
[INFO] [stdout]    --> src/std/map/hash_map.rs:463:9
[INFO] [stdout]     |
[INFO] [stdout] 463 |     use std::sync::atomic::Ordering;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `SyncMapImpl` in the type namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `SyncMapImpl` in the type namespace is also re-exported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(ambiguous_glob_reexports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `change_lifetime_const` in the value namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `change_lifetime_const` in the value namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `change_lifetime_mut` in the value namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `change_lifetime_mut` in the value namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `SyncMapRefMut` in the type namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `SyncMapRefMut` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `Iter` in the type namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `Iter` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]  --> src/std/map/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use btree_map::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^ the name `IterMut` in the type namespace is first re-exported here
[INFO] [stdout] 5 | pub use hash_map::*;
[INFO] [stdout]   |         ----------- but the name `IterMut` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::sleep`
[INFO] [stdout]    --> src/std/vec/mod.rs:406:9
[INFO] [stdout]     |
[INFO] [stdout] 406 |     use crate::sleep;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]    --> src/std/vec/mod.rs:409:9
[INFO] [stdout]     |
[INFO] [stdout] 409 |     use std::ops::Deref;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::atomic::Ordering`
[INFO] [stdout]    --> src/std/vec/mod.rs:410:9
[INFO] [stdout]     |
[INFO] [stdout] 410 |     use std::sync::atomic::Ordering;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]    --> src/io/sys/unix/co_io.rs:236:5
[INFO] [stdout]     |
[INFO] [stdout] 236 |     #![feature(test)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]  --> src/std/queue/mod.rs:1:33
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(all(nightly, test), feature(test))]
[INFO] [stdout]   |                                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]    --> src/std/queue/mpsc_list.rs:120:5
[INFO] [stdout]     |
[INFO] [stdout] 120 |     #![feature(test)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]    --> src/std/queue/mpsc_list_v1.rs:349:5
[INFO] [stdout]     |
[INFO] [stdout] 349 |     #![feature(test)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]    --> src/std/sync/condvar.rs:198:5
[INFO] [stdout]     |
[INFO] [stdout] 198 |     #![feature(test)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]    --> src/std/sync/mutex.rs:250:5
[INFO] [stdout]     |
[INFO] [stdout] 250 |     #![feature(test)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]    --> src/std/sync/rwlock.rs:326:5
[INFO] [stdout]     |
[INFO] [stdout] 326 |     #![feature(test)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]    --> src/std/sync/semphore.rs:174:5
[INFO] [stdout]     |
[INFO] [stdout] 174 |     #![feature(test)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]    --> src/std/sync/sync_flag.rs:155:5
[INFO] [stdout]     |
[INFO] [stdout] 155 |     #![feature(test)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ret`
[INFO] [stdout]    --> src/io/sys/unix/epoll.rs:163:13
[INFO] [stdout]     |
[INFO] [stdout] 163 |         let ret = write(unsafe { self.vec.get_unchecked(id) }.evfd, buf);
[INFO] [stdout]     |             ^^^ help: if this is intentional, prefix it with an underscore: `_ret`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/std/blocking/mod.rs:74:13
[INFO] [stdout]    |
[INFO] [stdout] 73 |             panic!("e");
[INFO] [stdout]    |             ----------- any code following this expression is unreachable
[INFO] [stdout] 74 |             return 1;
[INFO] [stdout]    |             ^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ret`
[INFO] [stdout]    --> src/io/sys/unix/epoll.rs:163:13
[INFO] [stdout]     |
[INFO] [stdout] 163 |         let ret = write(unsafe { self.vec.get_unchecked(id) }.evfd, buf);
[INFO] [stdout]     |             ^^^ help: if this is intentional, prefix it with an underscore: `_ret`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> tests/channel.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |             s1.send(1);
[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] 16 |             let _ = s1.send(1);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> tests/channel.rs:30:13
[INFO] [stdout]    |
[INFO] [stdout] 30 |             s1.send(1);
[INFO] [stdout]    |             ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 30 |             let _ = s1.send(1);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> tests/lib.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     unsafe { j.coroutine().cancel() };
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> tests/lib.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 |     unsafe { j.coroutine().cancel() };
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/std/sync/condvar.rs:346:13
[INFO] [stdout]     |
[INFO] [stdout] 346 |             unsafe { vec[i].coroutine().cancel() };
[INFO] [stdout]     |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/std/sync/mutex.rs:523:9
[INFO] [stdout]     |
[INFO] [stdout] 523 |         unsafe { h1.coroutine().cancel() };
[INFO] [stdout]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/std/sync/mutex.rs:564:9
[INFO] [stdout]     |
[INFO] [stdout] 564 |         unsafe { h1.coroutine().cancel() };
[INFO] [stdout]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/std/sync/once.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |         for i in 0..n {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/std/sync/once.rs:107:13
[INFO] [stdout]     |
[INFO] [stdout] 107 |         for i in 0..n {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/std/sync/rwlock.rs:634:9
[INFO] [stdout]     |
[INFO] [stdout] 634 |         unsafe { vec[cancel_id - 1].coroutine().cancel() };
[INFO] [stdout]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/std/sync/rwlock.rs:684:9
[INFO] [stdout]     |
[INFO] [stdout] 684 |         unsafe { h.coroutine().cancel() };
[INFO] [stdout]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/std/sync/semphore.rs:260:9
[INFO] [stdout]     |
[INFO] [stdout] 260 |         unsafe { h1.coroutine().cancel() };
[INFO] [stdout]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/std/sync/sync_flag.rs:199:9
[INFO] [stdout]     |
[INFO] [stdout] 199 |         unsafe { h1.coroutine().cancel() };
[INFO] [stdout]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/std/io/stream_chan.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |         let mut c = ChanStream { recv: r, send: s };
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/std/io/stream_chan.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |         let mut c = ChanStream { recv: r, send: s };
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/std/time/tick.rs:122:13
[INFO] [stdout]     |
[INFO] [stdout] 122 |         let mut t = Arc::new(Ticker::new(Duration::from_secs(1)));
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/std/time/time.rs:566:13
[INFO] [stdout]     |
[INFO] [stdout] 566 |         let mut now = Time::now();
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/btree_map.rs:487:21
[INFO] [stdout]     |
[INFO] [stdout] 487 |                 let insert = m1.insert(1, 2);
[INFO] [stdout]     |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/btree_map.rs:492:21
[INFO] [stdout]     |
[INFO] [stdout] 492 |                 let insert = m2.insert(1, 2);
[INFO] [stdout]     |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/btree_map.rs:502:13
[INFO] [stdout]     |
[INFO] [stdout] 502 |         let insert = m.insert(1, 2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/btree_map.rs:510:13
[INFO] [stdout]     |
[INFO] [stdout] 510 |         let insert = m.insert(1, 2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/btree_map.rs:520:13
[INFO] [stdout]     |
[INFO] [stdout] 520 |         let insert = m.insert(1, 2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:511:21
[INFO] [stdout]     |
[INFO] [stdout] 511 |                 let insert = m1.insert(1, 2);
[INFO] [stdout]     |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:516:21
[INFO] [stdout]     |
[INFO] [stdout] 516 |                 let insert = m2.insert(1, 2);
[INFO] [stdout]     |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:535:25
[INFO] [stdout]     |
[INFO] [stdout] 535 |                     let insert = m1.insert(i, i);
[INFO] [stdout]     |                         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:542:25
[INFO] [stdout]     |
[INFO] [stdout] 542 |                     let insert = m2.insert(i, i);
[INFO] [stdout]     |                         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:553:13
[INFO] [stdout]     |
[INFO] [stdout] 553 |         let insert = m.insert(1, 2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:573:13
[INFO] [stdout]     |
[INFO] [stdout] 573 |         let insert = m.insert(1, a);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:610:13
[INFO] [stdout]     |
[INFO] [stdout] 610 |         let insert = m.insert(1, 2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:620:13
[INFO] [stdout]     |
[INFO] [stdout] 620 |         let insert = m.insert(1, 2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:638:21
[INFO] [stdout]     |
[INFO] [stdout] 638 |                 let insert = m.insert(i, i);
[INFO] [stdout]     |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/map/hash_map.rs:664:21
[INFO] [stdout]     |
[INFO] [stdout] 664 |                 let insert = m.insert(i, i);
[INFO] [stdout]     |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]    --> src/std/map/hash_map.rs:673:21
[INFO] [stdout]     |
[INFO] [stdout] 673 |                 let g = m2.remove(&i);
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/vec/mod.rs:458:21
[INFO] [stdout]     |
[INFO] [stdout] 458 |                 let insert = m1.push(2);
[INFO] [stdout]     |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/vec/mod.rs:463:21
[INFO] [stdout]     |
[INFO] [stdout] 463 |                 let insert = m2.push(2);
[INFO] [stdout]     |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/vec/mod.rs:482:25
[INFO] [stdout]     |
[INFO] [stdout] 482 |                     let insert = m1.push(i);
[INFO] [stdout]     |                         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/vec/mod.rs:489:25
[INFO] [stdout]     |
[INFO] [stdout] 489 |                     let insert = m2.push(i);
[INFO] [stdout]     |                         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/vec/mod.rs:500:13
[INFO] [stdout]     |
[INFO] [stdout] 500 |         let insert = m.push(2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/vec/mod.rs:520:13
[INFO] [stdout]     |
[INFO] [stdout] 520 |         let insert = m.push(a);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/std/vec/mod.rs:534:13
[INFO] [stdout]     |
[INFO] [stdout] 534 |         for i in 0..1000000 {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/std/vec/mod.rs:543:13
[INFO] [stdout]     |
[INFO] [stdout] 543 |         for i in 0..1000000 {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/vec/mod.rs:557:13
[INFO] [stdout]     |
[INFO] [stdout] 557 |         let insert = m.push(2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `insert`
[INFO] [stdout]    --> src/std/vec/mod.rs:566:13
[INFO] [stdout]     |
[INFO] [stdout] 566 |         let insert = m.push(2);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_insert`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/queue/array_queue.rs:481:9
[INFO] [stdout]     |
[INFO] [stdout] 481 |         q.push(1);
[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] 481 |         let _ = q.push(1);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/queue/array_queue.rs:482:9
[INFO] [stdout]     |
[INFO] [stdout] 482 |         q.push(2);
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 482 |         let _ = q.push(2);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/queue/array_queue.rs:483:9
[INFO] [stdout]     |
[INFO] [stdout] 483 |         q.push(3);
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 483 |         let _ = q.push(3);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/condvar.rs:211:9
[INFO] [stdout]     |
[INFO] [stdout] 211 |         c.notify_one();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 211 |         let _ = c.notify_one();
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/condvar.rs:212:9
[INFO] [stdout]     |
[INFO] [stdout] 212 |         c.notify_all();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 212 |         let _ = c.notify_all();
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/condvar.rs:225:13
[INFO] [stdout]     |
[INFO] [stdout] 225 |             c2.notify_one();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 225 |             let _ = c2.notify_one();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/condvar.rs:260:9
[INFO] [stdout]     |
[INFO] [stdout] 260 |         cond.notify_all();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 260 |         let _ = cond.notify_all();
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/condvar.rs:280:13
[INFO] [stdout]     |
[INFO] [stdout] 280 |             c2.notify_one();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 280 |             let _ = c2.notify_one();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/condvar.rs:300:13
[INFO] [stdout]     |
[INFO] [stdout] 300 |             c2.notify_one();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 300 |             let _ = c2.notify_one();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/condvar.rs:357:9
[INFO] [stdout]     |
[INFO] [stdout] 357 |         cond.notify_all();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 357 |         let _ = cond.notify_all();
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/mutex.rs:393:13
[INFO] [stdout]     |
[INFO] [stdout] 393 |             cvar.notify_one();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 393 |             let _ = cvar.notify_one();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/mutex.rs:415:13
[INFO] [stdout]     |
[INFO] [stdout] 415 |             cvar.notify_one();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 415 |             let _ = cvar.notify_one();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/std/sync/once.rs:83:20
[INFO] [stdout]    |
[INFO] [stdout] 83 |             panic!(format!("once failed inside run: {} is not 1", o.value()));
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `panic!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 83 -             panic!(format!("once failed inside run: {} is not 1", o.value()));
[INFO] [stdout] 83 +             panic!("once failed inside run: {} is not 1", o.value());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/std/sync/once.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 |         s.send(true);
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 85 |         let _ = s.send(true);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/once.rs:108:13
[INFO] [stdout]     |
[INFO] [stdout] 108 |             r.recv();
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 108 |             let _ = r.recv();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/std/sync/once.rs:111:20
[INFO] [stdout]     |
[INFO] [stdout] 111 |             panic!(format!("once failed outside run: {} is not 1", one.value()));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `panic!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 111 -             panic!(format!("once failed outside run: {} is not 1", one.value()));
[INFO] [stdout] 111 +             panic!("once failed outside run: {} is not 1", one.value());
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/once.rs:118:9
[INFO] [stdout]     |
[INFO] [stdout] 118 | /         catch_unwind(|| {
[INFO] [stdout] 119 | |             once.r#do(|| {
[INFO] [stdout] 120 | |                 panic!("failed");
[INFO] [stdout] 121 | |             });
[INFO] [stdout] 122 | |         });
[INFO] [stdout]     | |__________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 118 |         let _ = catch_unwind(|| {
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/rwlock.rs:641:13
[INFO] [stdout]     |
[INFO] [stdout] 641 |             cond.notify_all();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 641 |             let _ = cond.notify_all();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/channel.rs:456:13
[INFO] [stdout]     |
[INFO] [stdout] 456 |             tx.send(1);
[INFO] [stdout]     |             ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 456 |             let _ = tx.send(1);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/sync/channel.rs:459:13
[INFO] [stdout]     |
[INFO] [stdout] 459 |             tx.send(2);
[INFO] [stdout]     |             ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 459 |             let _ = tx.send(2);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/std/io/stream_chan.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |         s.send(Some(Ok(1)));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 53 |         let _ = s.send(Some(Ok(1)));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/std/io/stream_chan.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |         s.send(None);
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 54 |         let _ = s.send(None);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/std/io/stream_chan.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |         s.send(Some(Ok(1)));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 64 |         let _ = s.send(Some(Ok(1)));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/std/io/stream_chan.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |         s.send(None);
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let _ = s.send(None);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/std/time/tick.rs:130:9
[INFO] [stdout]     |
[INFO] [stdout] 130 |         t.stop();
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 130 |         let _ = t.stop();
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/std/map/btree_map.rs:504:25
[INFO] [stdout]     |
[INFO] [stdout] 504 |         assert_eq!(2, *g.deref());
[INFO] [stdout]     |                         ^^^^^^^^ help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `i32` does not implement `Deref`, so calling `deref` on `&i32` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/std/map/hash_map.rs:640:33
[INFO] [stdout]     |
[INFO] [stdout] 640 |                 assert_eq!(i, *g.deref());
[INFO] [stdout]     |                                 ^^^^^^^^ help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `i32` does not implement `Deref`, so calling `deref` on `&i32` copies the reference, which does not do anything and can be removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/std/map/hash_map.rs:666:33
[INFO] [stdout]     |
[INFO] [stdout] 666 |                 assert_eq!(i, *g.deref());
[INFO] [stdout]     |                                 ^^^^^^^^ help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `i32` does not implement `Deref`, so calling `deref` on `&i32` copies the reference, which does not do anything and can be removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 120 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.40s
[INFO] running `Command { std: "docker" "inspect" "beae63b90a1fbe165017aa39d5b5af889a559107ef0d823af49cb394e52e3a6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "beae63b90a1fbe165017aa39d5b5af889a559107ef0d823af49cb394e52e3a6f", kill_on_drop: false }`
[INFO] [stdout] beae63b90a1fbe165017aa39d5b5af889a559107ef0d823af49cb394e52e3a6f