[INFO] fetching crate jack 0.11.4...
[INFO] checking jack-0.11.4 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate jack 0.11.4 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate jack 0.11.4 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate jack 0.11.4
[INFO] finished tweaking crates.io crate jack 0.11.4
[INFO] tweaked toml for crates.io crate jack 0.11.4 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate jack 0.11.4 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded jack-sys v0.5.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a21145511bd7bb06f01be2f12a41b289d9678650cd08519c72efb6f0ca7f5829
[INFO] running `Command { std: "docker" "start" "-a" "a21145511bd7bb06f01be2f12a41b289d9678650cd08519c72efb6f0ca7f5829", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a21145511bd7bb06f01be2f12a41b289d9678650cd08519c72efb6f0ca7f5829", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a21145511bd7bb06f01be2f12a41b289d9678650cd08519c72efb6f0ca7f5829", kill_on_drop: false }`
[INFO] [stdout] a21145511bd7bb06f01be2f12a41b289d9678650cd08519c72efb6f0ca7f5829
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9f87f5fcde96e1a3ebb567be4a56d7b8b389aa6766a87ff00a1d15cdf80896fe
[INFO] running `Command { std: "docker" "start" "-a" "9f87f5fcde96e1a3ebb567be4a56d7b8b389aa6766a87ff00a1d15cdf80896fe", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling crossbeam-utils v0.8.12
[INFO] [stderr]     Checking libloading v0.7.3
[INFO] [stderr]    Compiling jack v0.11.4 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling jack-sys v0.5.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stdout] warning: the item `Eq` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
[INFO] [stdout]   |                ^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Eq` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Ord` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:3:20
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
[INFO] [stdout]   |                    ^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Ord` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PartialEq` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:3:35
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
[INFO] [stdout]   |                                   ^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `PartialEq` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PartialOrd` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:3:46
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
[INFO] [stdout]   |                                              ^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `PartialOrd` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Sized` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::marker::Sized;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Sized` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ClosureProcessHandler` is imported redundantly
[INFO] [stdout]  --> src/client/test.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::client::*;
[INFO] [stdout]   |     ---------------- the item `ClosureProcessHandler` is already imported here
[INFO] [stdout] 2 | use crate::jack_enums::Error;
[INFO] [stdout] 3 | use crate::{ClosureProcessHandler, Control, RingBuffer};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Client` is imported redundantly
[INFO] [stdout]  --> src/client/test_callback.rs:5:22
[INFO] [stdout]   |
[INFO] [stdout] 4 | use super::*;
[INFO] [stdout]   |     -------- the item `Client` is already imported here
[INFO] [stdout] 5 | use crate::{AudioIn, Client, Control, Frames, NotificationHandler, PortId, ProcessHandler};
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `NotificationHandler` is imported redundantly
[INFO] [stdout]  --> src/client/test_callback.rs:5:47
[INFO] [stdout]   |
[INFO] [stdout] 4 | use super::*;
[INFO] [stdout]   |     -------- the item `NotificationHandler` is already imported here
[INFO] [stdout] 5 | use crate::{AudioIn, Client, Control, Frames, NotificationHandler, PortId, ProcessHandler};
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ProcessHandler` is imported redundantly
[INFO] [stdout]  --> src/client/test_callback.rs:5:76
[INFO] [stdout]   |
[INFO] [stdout] 4 | use super::*;
[INFO] [stdout]   |     -------- the item `ProcessHandler` is already imported here
[INFO] [stdout] 5 | use crate::{AudioIn, Client, Control, Frames, NotificationHandler, PortId, ProcessHandler};
[INFO] [stdout]   |                                                                            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Frames` is imported redundantly
[INFO] [stdout]    --> src/port/midi.rs:218:9
[INFO] [stdout]     |
[INFO] [stdout] 213 |     use super::*;
[INFO] [stdout]     |         -------- the item `Frames` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 218 |     use crate::primitive_types::Frames;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]    --> src/port/midi.rs:222:9
[INFO] [stdout]     |
[INFO] [stdout] 222 |     use std::iter::Iterator;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]     |
[INFO] [stdout]     = note: the item `Iterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Eq` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
[INFO] [stdout]   |                ^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Eq` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Ord` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:3:20
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
[INFO] [stdout]   |                    ^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Ord` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PartialEq` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:3:35
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
[INFO] [stdout]   |                                   ^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `PartialEq` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PartialOrd` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:3:46
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
[INFO] [stdout]   |                                              ^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `PartialOrd` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Sized` is imported redundantly
[INFO] [stdout]  --> src/port/port_impl.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::marker::Sized;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Sized` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PORT_NAME_SIZE` is imported redundantly
[INFO] [stdout]  --> src/port/test_client.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::*;
[INFO] [stdout]   |     -------- the item `PORT_NAME_SIZE` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 7 | use crate::PORT_NAME_SIZE;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `2` is never read
[INFO] [stdout]   --> src/client/client_impl.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub struct Client(
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 36 |     Option<Box<dyn PropertyChangeHandler>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |     (),
[INFO] [stdout]    |     ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> examples/show_midi.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `2` is never read
[INFO] [stdout]   --> src/client/client_impl.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub struct Client(
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 36 |     Option<Box<dyn PropertyChangeHandler>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |     (),
[INFO] [stdout]    |     ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `process_return_val` is never read
[INFO] [stdout]  --> src/client/test_callback.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct Counter {
[INFO] [stdout]   |            ------- field in this struct
[INFO] [stdout] 9 |     pub process_return_val: Control,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Counter` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.14s
[INFO] running `Command { std: "docker" "inspect" "9f87f5fcde96e1a3ebb567be4a56d7b8b389aa6766a87ff00a1d15cdf80896fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f87f5fcde96e1a3ebb567be4a56d7b8b389aa6766a87ff00a1d15cdf80896fe", kill_on_drop: false }`
[INFO] [stdout] 9f87f5fcde96e1a3ebb567be4a56d7b8b389aa6766a87ff00a1d15cdf80896fe