[INFO] fetching crate librapidarchive 0.2.0...
[INFO] checking librapidarchive-0.2.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate librapidarchive 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate librapidarchive 0.2.0 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 librapidarchive 0.2.0
[INFO] finished tweaking crates.io crate librapidarchive 0.2.0
[INFO] tweaked toml for crates.io crate librapidarchive 0.2.0 written to /workspace/builds/worker-0-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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 43 packages
[INFO] [stderr]       Adding autocfg v0.1.8 (latest: v1.2.0)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding bytes v0.4.12 (latest: v1.6.0)
[INFO] [stderr]       Adding cfg-if v0.1.10 (latest: v1.0.0)
[INFO] [stderr]       Adding cloudabi v0.0.3 (latest: v0.1.0)
[INFO] [stderr]       Adding nix v0.10.0 (latest: v0.28.0)
[INFO] [stderr]       Adding num v0.2.1 (latest: v0.4.1)
[INFO] [stderr]       Adding num-bigint v0.2.6 (latest: v0.4.4)
[INFO] [stderr]       Adding num-complex v0.2.4 (latest: v0.4.5)
[INFO] [stderr]       Adding num-rational v0.2.4 (latest: v0.4.1)
[INFO] [stderr]       Adding rand v0.6.5 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_chacha v0.1.1 (latest: v0.3.1)
[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 rand_hc v0.1.0 (latest: v0.3.2)
[INFO] [stderr]       Adding rand_isaac v0.1.1 (latest: v0.3.0)
[INFO] [stderr]       Adding rand_jitter v0.1.4 (latest: v0.4.0)
[INFO] [stderr]       Adding rand_os v0.1.3 (latest: v0.2.2)
[INFO] [stderr]       Adding rand_pcg v0.1.2 (latest: v0.3.1)
[INFO] [stderr]       Adding rand_xorshift v0.1.1 (latest: v0.3.0)
[INFO] [stderr]       Adding rdrand v0.4.0 (latest: v0.8.3)
[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]     Blocking waiting for file lock on package cache
[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-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4bb3a629051a3e5976ebf60ce8d00871548673a0bb8d7b6dd2e23694da1b5958
[INFO] running `Command { std: "docker" "start" "-a" "4bb3a629051a3e5976ebf60ce8d00871548673a0bb8d7b6dd2e23694da1b5958", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4bb3a629051a3e5976ebf60ce8d00871548673a0bb8d7b6dd2e23694da1b5958", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bb3a629051a3e5976ebf60ce8d00871548673a0bb8d7b6dd2e23694da1b5958", kill_on_drop: false }`
[INFO] [stdout] 4bb3a629051a3e5976ebf60ce8d00871548673a0bb8d7b6dd2e23694da1b5958
[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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8670283d15b87d1ba6f2d87b58d75150b3f0a288ae0292c388d310a8b2444c58
[INFO] running `Command { std: "docker" "start" "-a" "8670283d15b87d1ba6f2d87b58d75150b3f0a288ae0292c388d310a8b2444c58", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking pad v0.1.6
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking librapidarchive v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `num` is imported redundantly
[INFO] [stdout]  --> src/tar/gnu.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use num;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate num;
[INFO] [stdout]   | ----------------- the item `num` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_traits` is imported redundantly
[INFO] [stdout]  --> src/tar/gnu.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use num_traits;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate num_traits;
[INFO] [stdout]   | ------------------------ the item `num_traits` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num` is imported redundantly
[INFO] [stdout]  --> src/tar/ustar.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use num;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate num;
[INFO] [stdout]   | ----------------- the item `num` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_traits` is imported redundantly
[INFO] [stdout]  --> src/tar/ustar.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use num_traits;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate num_traits;
[INFO] [stdout]   | ------------------------ the item `num_traits` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]  --> src/tape/unix.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use libc;
[INFO] [stdout]   |     ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PartialEq` is imported redundantly
[INFO] [stdout]  --> src/fs/portable.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::cmp::PartialEq;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/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 `Result` is imported redundantly
[INFO] [stdout]  --> src/units/data.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::result::Result;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Result` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tar/mod.rs:93:72
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn serialize<I>(traversal: &header::HeaderGenResult, tarball: &mut ArchivalSink<I>) -> io::Result<u64> {
[INFO] [stdout]    |                                                                        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn serialize<I>(traversal: &header::HeaderGenResult, tarball: &mut dyn ArchivalSink<I>) -> io::Result<u64> {
[INFO] [stdout]    |                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tar/recovery.rs:72:32
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn recover_data(sink: &mut ArchivalSink<RecoveryEntry>, format: TarFormat, lost: Vec<DataZone<RecoveryEntry>>) -> io::Result<Option<V...
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn recover_data(sink: &mut dyn ArchivalSink<RecoveryEntry>, format: TarFormat, lost: Vec<DataZone<RecoveryEntry>>) -> io::Result<Option<Vec<DataZone<RecoveryEntry>>>> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/traverse.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cause(&self) -> Option<&dyn error::Error> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/portable.rs:85:117
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<ArchivalSink<I>>> whe...
[INFO] [stdout]    |                                                                                                                     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<dyn ArchivalSink<I>>> where ffi::OsString: From<P>, P: Clone, I: 'static + Send + Clone + PartialEq {
[INFO] [stdout]    |                                                                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/fs/portable.rs:120:71
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn open_tape<P: AsRef<path::Path>>(_tapedev: P) -> io::Result<Box<tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]     |                                                                       ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn open_tape<P: AsRef<path::Path>>(_tapedev: P) -> io::Result<Box<dyn tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]     |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/unix.rs:22:117
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<ArchivalSink<I>>> whe...
[INFO] [stdout]    |                                                                                                                     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<dyn ArchivalSink<I>>> where ffi::OsString: From<P>, P: Clone, I: 'static + Send + Clone + PartialEq {
[INFO] [stdout]    |                                                                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/unix.rs:50:70
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_tape<P: AsRef<path::Path>>(tapedev: P) -> io::Result<Box<tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]    |                                                                      ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_tape<P: AsRef<path::Path>>(tapedev: P) -> io::Result<Box<dyn tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]    |                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num` is imported redundantly
[INFO] [stdout]  --> src/tar/gnu.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use num;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate num;
[INFO] [stdout]   | ----------------- the item `num` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_traits` is imported redundantly
[INFO] [stdout]  --> src/tar/gnu.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use num_traits;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate num_traits;
[INFO] [stdout]   | ------------------------ the item `num_traits` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num` is imported redundantly
[INFO] [stdout]  --> src/tar/ustar.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use num;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate num;
[INFO] [stdout]   | ----------------- the item `num` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_traits` is imported redundantly
[INFO] [stdout]  --> src/tar/ustar.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use num_traits;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate num_traits;
[INFO] [stdout]   | ------------------------ the item `num_traits` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]  --> src/tape/unix.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use libc;
[INFO] [stdout]   |     ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PartialEq` is imported redundantly
[INFO] [stdout]  --> src/fs/portable.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::cmp::PartialEq;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/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 `Result` is imported redundantly
[INFO] [stdout]  --> src/units/data.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::result::Result;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Result` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tar/mod.rs:93:72
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn serialize<I>(traversal: &header::HeaderGenResult, tarball: &mut ArchivalSink<I>) -> io::Result<u64> {
[INFO] [stdout]    |                                                                        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn serialize<I>(traversal: &header::HeaderGenResult, tarball: &mut dyn ArchivalSink<I>) -> io::Result<u64> {
[INFO] [stdout]    |                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tar/recovery.rs:72:32
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn recover_data(sink: &mut ArchivalSink<RecoveryEntry>, format: TarFormat, lost: Vec<DataZone<RecoveryEntry>>) -> io::Result<Option<V...
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn recover_data(sink: &mut dyn ArchivalSink<RecoveryEntry>, format: TarFormat, lost: Vec<DataZone<RecoveryEntry>>) -> io::Result<Option<Vec<DataZone<RecoveryEntry>>>> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/traverse.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cause(&self) -> Option<&dyn error::Error> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/portable.rs:85:117
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<ArchivalSink<I>>> whe...
[INFO] [stdout]    |                                                                                                                     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<dyn ArchivalSink<I>>> where ffi::OsString: From<P>, P: Clone, I: 'static + Send + Clone + PartialEq {
[INFO] [stdout]    |                                                                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/fs/portable.rs:120:71
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn open_tape<P: AsRef<path::Path>>(_tapedev: P) -> io::Result<Box<tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]     |                                                                       ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn open_tape<P: AsRef<path::Path>>(_tapedev: P) -> io::Result<Box<dyn tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]     |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/unix.rs:22:117
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<ArchivalSink<I>>> whe...
[INFO] [stdout]    |                                                                                                                     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<dyn ArchivalSink<I>>> where ffi::OsString: From<P>, P: Clone, I: 'static + Send + Clone + PartialEq {
[INFO] [stdout]    |                                                                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/unix.rs:50:70
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_tape<P: AsRef<path::Path>>(tapedev: P) -> io::Result<Box<tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]    |                                                                      ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_tape<P: AsRef<path::Path>>(tapedev: P) -> io::Result<Box<dyn tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]    |                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/traverse.rs:29:33
[INFO] [stdout]    |
[INFO] [stdout] 29 |             IOError(err) => err.description()
[INFO] [stdout]    |                                 ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/traverse.rs:29:33
[INFO] [stdout]    |
[INFO] [stdout] 29 |             IOError(err) => err.description()
[INFO] [stdout]    |                                 ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/fs/unix.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let mut username;
[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/fs/unix.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |     let mut groupname;
[INFO] [stdout]     |         ----^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `drain_buf_until_empty` is never used
[INFO] [stdout]    --> src/concurrentbuf.rs:206:8
[INFO] [stdout]     |
[INFO] [stdout] 126 | impl<T, P> ConcurrentWriteBuffer<T, P> where T: 'static + io::Write + Send + RecoverableWrite<P>, P: 'static + Send + Clone + PartialEq {
[INFO] [stdout]     | --------------------------------------------------------------------------------------------------------------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 206 |     fn drain_buf_until_empty(&mut self) -> io::Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/fs/unix.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let mut username;
[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/fs/unix.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |     let mut groupname;
[INFO] [stdout]     |         ----^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `drain_buf_until_empty` is never used
[INFO] [stdout]    --> src/concurrentbuf.rs:206:8
[INFO] [stdout]     |
[INFO] [stdout] 126 | impl<T, P> ConcurrentWriteBuffer<T, P> where T: 'static + io::Write + Send + RecoverableWrite<P>, P: 'static + Send + Clone + PartialEq {
[INFO] [stdout]     | --------------------------------------------------------------------------------------------------------------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 206 |     fn drain_buf_until_empty(&mut self) -> io::Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.62s
[INFO] running `Command { std: "docker" "inspect" "8670283d15b87d1ba6f2d87b58d75150b3f0a288ae0292c388d310a8b2444c58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8670283d15b87d1ba6f2d87b58d75150b3f0a288ae0292c388d310a8b2444c58", kill_on_drop: false }`
[INFO] [stdout] 8670283d15b87d1ba6f2d87b58d75150b3f0a288ae0292c388d310a8b2444c58
[INFO] checking librapidarchive-0.2.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate librapidarchive 0.2.0 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate librapidarchive 0.2.0 on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate librapidarchive 0.2.0
[INFO] finished tweaking crates.io crate librapidarchive 0.2.0
[INFO] tweaked toml for crates.io crate librapidarchive 0.2.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 43 packages
[INFO] [stderr]       Adding autocfg v0.1.8 (latest: v1.2.0)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding bytes v0.4.12 (latest: v1.6.0)
[INFO] [stderr]       Adding cfg-if v0.1.10 (latest: v1.0.0)
[INFO] [stderr]       Adding cloudabi v0.0.3 (latest: v0.1.0)
[INFO] [stderr]       Adding nix v0.10.0 (latest: v0.28.0)
[INFO] [stderr]       Adding num v0.2.1 (latest: v0.4.1)
[INFO] [stderr]       Adding num-bigint v0.2.6 (latest: v0.4.4)
[INFO] [stderr]       Adding num-complex v0.2.4 (latest: v0.4.5)
[INFO] [stderr]       Adding num-rational v0.2.4 (latest: v0.4.1)
[INFO] [stderr]       Adding rand v0.6.5 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_chacha v0.1.1 (latest: v0.3.1)
[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 rand_hc v0.1.0 (latest: v0.3.2)
[INFO] [stderr]       Adding rand_isaac v0.1.1 (latest: v0.3.0)
[INFO] [stderr]       Adding rand_jitter v0.1.4 (latest: v0.4.0)
[INFO] [stderr]       Adding rand_os v0.1.3 (latest: v0.2.2)
[INFO] [stderr]       Adding rand_pcg v0.1.2 (latest: v0.3.1)
[INFO] [stderr]       Adding rand_xorshift v0.1.1 (latest: v0.3.0)
[INFO] [stderr]       Adding rdrand v0.4.0 (latest: v0.8.3)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7dd2181d88c3e357c4f2e01844e5bc76cf9a64949e3c569e8962d0c530964a1f
[INFO] running `Command { std: "docker" "start" "-a" "7dd2181d88c3e357c4f2e01844e5bc76cf9a64949e3c569e8962d0c530964a1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7dd2181d88c3e357c4f2e01844e5bc76cf9a64949e3c569e8962d0c530964a1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7dd2181d88c3e357c4f2e01844e5bc76cf9a64949e3c569e8962d0c530964a1f", kill_on_drop: false }`
[INFO] [stdout] 7dd2181d88c3e357c4f2e01844e5bc76cf9a64949e3c569e8962d0c530964a1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9451fbcb32865a54cb4b34bf6a4bd9bd852a8f9b58ffca2b3aabbe8672252826
[INFO] running `Command { std: "docker" "start" "-a" "9451fbcb32865a54cb4b34bf6a4bd9bd852a8f9b58ffca2b3aabbe8672252826", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking pad v0.1.6
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking librapidarchive v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `num` is imported redundantly
[INFO] [stdout]  --> src/tar/gnu.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use num;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate num;
[INFO] [stdout]   | ----------------- the item `num` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_traits` is imported redundantly
[INFO] [stdout]  --> src/tar/gnu.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use num_traits;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate num_traits;
[INFO] [stdout]   | ------------------------ the item `num_traits` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num` is imported redundantly
[INFO] [stdout]  --> src/tar/ustar.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use num;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate num;
[INFO] [stdout]   | ----------------- the item `num` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_traits` is imported redundantly
[INFO] [stdout]  --> src/tar/ustar.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use num_traits;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate num_traits;
[INFO] [stdout]   | ------------------------ the item `num_traits` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]  --> src/tape/unix.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use libc;
[INFO] [stdout]   |     ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PartialEq` is imported redundantly
[INFO] [stdout]  --> src/fs/portable.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::cmp::PartialEq;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/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 `Result` is imported redundantly
[INFO] [stdout]  --> src/units/data.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::result::Result;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Result` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tar/mod.rs:93:72
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn serialize<I>(traversal: &header::HeaderGenResult, tarball: &mut ArchivalSink<I>) -> io::Result<u64> {
[INFO] [stdout]    |                                                                        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn serialize<I>(traversal: &header::HeaderGenResult, tarball: &mut dyn ArchivalSink<I>) -> io::Result<u64> {
[INFO] [stdout]    |                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tar/recovery.rs:72:32
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn recover_data(sink: &mut ArchivalSink<RecoveryEntry>, format: TarFormat, lost: Vec<DataZone<RecoveryEntry>>) -> io::Result<Option<V...
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn recover_data(sink: &mut dyn ArchivalSink<RecoveryEntry>, format: TarFormat, lost: Vec<DataZone<RecoveryEntry>>) -> io::Result<Option<Vec<DataZone<RecoveryEntry>>>> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/traverse.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cause(&self) -> Option<&dyn error::Error> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/portable.rs:85:117
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<ArchivalSink<I>>> whe...
[INFO] [stdout]    |                                                                                                                     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<dyn ArchivalSink<I>>> where ffi::OsString: From<P>, P: Clone, I: 'static + Send + Clone + PartialEq {
[INFO] [stdout]    |                                                                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/fs/portable.rs:120:71
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn open_tape<P: AsRef<path::Path>>(_tapedev: P) -> io::Result<Box<tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]     |                                                                       ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn open_tape<P: AsRef<path::Path>>(_tapedev: P) -> io::Result<Box<dyn tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]     |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/unix.rs:22:117
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<ArchivalSink<I>>> whe...
[INFO] [stdout]    |                                                                                                                     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<dyn ArchivalSink<I>>> where ffi::OsString: From<P>, P: Clone, I: 'static + Send + Clone + PartialEq {
[INFO] [stdout]    |                                                                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/unix.rs:50:70
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_tape<P: AsRef<path::Path>>(tapedev: P) -> io::Result<Box<tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]    |                                                                      ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_tape<P: AsRef<path::Path>>(tapedev: P) -> io::Result<Box<dyn tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]    |                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num` is imported redundantly
[INFO] [stdout]  --> src/tar/gnu.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use num;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate num;
[INFO] [stdout]   | ----------------- the item `num` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_traits` is imported redundantly
[INFO] [stdout]  --> src/tar/gnu.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use num_traits;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate num_traits;
[INFO] [stdout]   | ------------------------ the item `num_traits` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num` is imported redundantly
[INFO] [stdout]  --> src/tar/ustar.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use num;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | extern crate num;
[INFO] [stdout]   | ----------------- the item `num` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_traits` is imported redundantly
[INFO] [stdout]  --> src/tar/ustar.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use num_traits;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate num_traits;
[INFO] [stdout]   | ------------------------ the item `num_traits` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]  --> src/tape/unix.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use libc;
[INFO] [stdout]   |     ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `PartialEq` is imported redundantly
[INFO] [stdout]  --> src/fs/portable.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::cmp::PartialEq;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/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 `Result` is imported redundantly
[INFO] [stdout]  --> src/units/data.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::result::Result;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Result` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tar/mod.rs:93:72
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn serialize<I>(traversal: &header::HeaderGenResult, tarball: &mut ArchivalSink<I>) -> io::Result<u64> {
[INFO] [stdout]    |                                                                        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn serialize<I>(traversal: &header::HeaderGenResult, tarball: &mut dyn ArchivalSink<I>) -> io::Result<u64> {
[INFO] [stdout]    |                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tar/recovery.rs:72:32
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn recover_data(sink: &mut ArchivalSink<RecoveryEntry>, format: TarFormat, lost: Vec<DataZone<RecoveryEntry>>) -> io::Result<Option<V...
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn recover_data(sink: &mut dyn ArchivalSink<RecoveryEntry>, format: TarFormat, lost: Vec<DataZone<RecoveryEntry>>) -> io::Result<Option<Vec<DataZone<RecoveryEntry>>>> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/traverse.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cause(&self) -> Option<&dyn error::Error> {
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/portable.rs:85:117
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<ArchivalSink<I>>> whe...
[INFO] [stdout]    |                                                                                                                     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<dyn ArchivalSink<I>>> where ffi::OsString: From<P>, P: Clone, I: 'static + Send + Clone + PartialEq {
[INFO] [stdout]    |                                                                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/fs/portable.rs:120:71
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn open_tape<P: AsRef<path::Path>>(_tapedev: P) -> io::Result<Box<tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]     |                                                                       ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn open_tape<P: AsRef<path::Path>>(_tapedev: P) -> io::Result<Box<dyn tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]     |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/unix.rs:22:117
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<ArchivalSink<I>>> whe...
[INFO] [stdout]    |                                                                                                                     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn open_sink<P: AsRef<path::Path>, I>(outfile: P, tuning: &Configuration, limit: Option<u64>) -> io::Result<Box<dyn ArchivalSink<I>>> where ffi::OsString: From<P>, P: Clone, I: 'static + Send + Clone + PartialEq {
[INFO] [stdout]    |                                                                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/fs/unix.rs:50:70
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_tape<P: AsRef<path::Path>>(tapedev: P) -> io::Result<Box<tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]    |                                                                      ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_tape<P: AsRef<path::Path>>(tapedev: P) -> io::Result<Box<dyn tape::TapeDevice>> where ffi::OsString: From<P>, P: Clone {
[INFO] [stdout]    |                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/traverse.rs:29:33
[INFO] [stdout]    |
[INFO] [stdout] 29 |             IOError(err) => err.description()
[INFO] [stdout]    |                                 ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/traverse.rs:29:33
[INFO] [stdout]    |
[INFO] [stdout] 29 |             IOError(err) => err.description()
[INFO] [stdout]    |                                 ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/fs/unix.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let mut username;
[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/fs/unix.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |     let mut groupname;
[INFO] [stdout]     |         ----^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `drain_buf_until_empty` is never used
[INFO] [stdout]    --> src/concurrentbuf.rs:206:8
[INFO] [stdout]     |
[INFO] [stdout] 126 | impl<T, P> ConcurrentWriteBuffer<T, P> where T: 'static + io::Write + Send + RecoverableWrite<P>, P: 'static + Send + Clone + PartialEq {
[INFO] [stdout]     | --------------------------------------------------------------------------------------------------------------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 206 |     fn drain_buf_until_empty(&mut self) -> io::Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/fs/unix.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let mut username;
[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/fs/unix.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |     let mut groupname;
[INFO] [stdout]     |         ----^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `drain_buf_until_empty` is never used
[INFO] [stdout]    --> src/concurrentbuf.rs:206:8
[INFO] [stdout]     |
[INFO] [stdout] 126 | impl<T, P> ConcurrentWriteBuffer<T, P> where T: 'static + io::Write + Send + RecoverableWrite<P>, P: 'static + Send + Clone + PartialEq {
[INFO] [stdout]     | --------------------------------------------------------------------------------------------------------------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 206 |     fn drain_buf_until_empty(&mut self) -> io::Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.36s
[INFO] running `Command { std: "docker" "inspect" "9451fbcb32865a54cb4b34bf6a4bd9bd852a8f9b58ffca2b3aabbe8672252826", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9451fbcb32865a54cb4b34bf6a4bd9bd852a8f9b58ffca2b3aabbe8672252826", kill_on_drop: false }`
[INFO] [stdout] 9451fbcb32865a54cb4b34bf6a4bd9bd852a8f9b58ffca2b3aabbe8672252826