[INFO] updating cached repository https://github.com/rillomas/rust_multithread
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7baf14955f4a59a65f55d82a4bacd568c24ecc8c
[INFO] testing rillomas/rust_multithread against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frillomas%2Frust_multithread" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rillomas/rust_multithread on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/rillomas/rust_multithread
[INFO] finished tweaking git repo https://github.com/rillomas/rust_multithread
[INFO] tweaked toml for git repo https://github.com/rillomas/rust_multithread written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/rillomas/rust_multithread already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: the lock file /workspace/builds/worker-3/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e74eb8b43570c692c43b46b9f8a8286d777e24d41a8cce15f3cd46490f23c299
[INFO] running `"docker" "start" "-a" "e74eb8b43570c692c43b46b9f8a8286d777e24d41a8cce15f3cd46490f23c299"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling byteorder v0.3.13
[INFO] [stderr]    Compiling bincode v0.3.0
[INFO] [stderr]    Compiling rust_multithread v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:40:11
[INFO] [stderr]    |
[INFO] [stderr] 40 |         let f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:51:3
[INFO] [stderr]    |
[INFO] [stderr] 51 |         try!(bw.write_all(sl));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:57:11
[INFO] [stderr]    |
[INFO] [stderr] 57 |         let f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:60:3
[INFO] [stderr]    |
[INFO] [stderr] 60 |         try!(write!(bw,"P2\n"));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:62:3
[INFO] [stderr]    |
[INFO] [stderr] 62 |         try!(write!(bw, "{} {}\n", self.header.width, self.header.height));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:64:3
[INFO] [stderr]    |
[INFO] [stderr] 64 |         try!(write!(bw, "{}\n", 65535)); 
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:67:4
[INFO] [stderr]    |
[INFO] [stderr] 67 |             try!(write!(bw, "{} ", d));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:73:15
[INFO] [stderr]    |
[INFO] [stderr] 73 |         let bytes = try!(bincode::encode(self, bincode::SizeLimit::Infinite));
[INFO] [stderr]    |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:74:18
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let mut file = try!(File::create(path));
[INFO] [stderr]    |                        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:75:3
[INFO] [stderr]    |
[INFO] [stderr] 75 |         try!(file.write_all(&bytes));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::error::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/image/mod.rs:72:57
[INFO] [stderr]    |
[INFO] [stderr] 72 |     pub fn serialize(&self, path: &str) ->  Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                                            ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `write_to_file`
[INFO] [stderr]   --> src/image/mod.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn write_to_file(&self, path: &str) -> std::io::Result<()> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `serialize`
[INFO] [stderr]   --> src/image/mod.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     pub fn serialize(&self, path: &str) ->  Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 15 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.08s
[INFO] running `"docker" "inspect" "e74eb8b43570c692c43b46b9f8a8286d777e24d41a8cce15f3cd46490f23c299"`
[INFO] running `"docker" "rm" "-f" "e74eb8b43570c692c43b46b9f8a8286d777e24d41a8cce15f3cd46490f23c299"`
[INFO] [stdout] e74eb8b43570c692c43b46b9f8a8286d777e24d41a8cce15f3cd46490f23c299
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fa2bb96fa05894ad0d63ece0a3ac794ab553b5872860a6a200db836ffd4a8917
[INFO] running `"docker" "start" "-a" "fa2bb96fa05894ad0d63ece0a3ac794ab553b5872860a6a200db836ffd4a8917"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling rust_multithread v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:40:11
[INFO] [stderr]    |
[INFO] [stderr] 40 |         let f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:51:3
[INFO] [stderr]    |
[INFO] [stderr] 51 |         try!(bw.write_all(sl));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:57:11
[INFO] [stderr]    |
[INFO] [stderr] 57 |         let f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:60:3
[INFO] [stderr]    |
[INFO] [stderr] 60 |         try!(write!(bw,"P2\n"));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:62:3
[INFO] [stderr]    |
[INFO] [stderr] 62 |         try!(write!(bw, "{} {}\n", self.header.width, self.header.height));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:64:3
[INFO] [stderr]    |
[INFO] [stderr] 64 |         try!(write!(bw, "{}\n", 65535)); 
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:67:4
[INFO] [stderr]    |
[INFO] [stderr] 67 |             try!(write!(bw, "{} ", d));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:73:15
[INFO] [stderr]    |
[INFO] [stderr] 73 |         let bytes = try!(bincode::encode(self, bincode::SizeLimit::Infinite));
[INFO] [stderr]    |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:74:18
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let mut file = try!(File::create(path));
[INFO] [stderr]    |                        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:75:3
[INFO] [stderr]    |
[INFO] [stderr] 75 |         try!(file.write_all(&bytes));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::error::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/image/mod.rs:72:57
[INFO] [stderr]    |
[INFO] [stderr] 72 |     pub fn serialize(&self, path: &str) ->  Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                                            ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `write_to_file`
[INFO] [stderr]   --> src/image/mod.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn write_to_file(&self, path: &str) -> std::io::Result<()> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `serialize`
[INFO] [stderr]   --> src/image/mod.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     pub fn serialize(&self, path: &str) ->  Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 15 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `"docker" "inspect" "fa2bb96fa05894ad0d63ece0a3ac794ab553b5872860a6a200db836ffd4a8917"`
[INFO] running `"docker" "rm" "-f" "fa2bb96fa05894ad0d63ece0a3ac794ab553b5872860a6a200db836ffd4a8917"`
[INFO] [stdout] fa2bb96fa05894ad0d63ece0a3ac794ab553b5872860a6a200db836ffd4a8917
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c88f2d79287dac0b25d8094c5c2eab8c1d1bd5ac9593fc30c9c096bd505d933d
[INFO] running `"docker" "start" "-a" "c88f2d79287dac0b25d8094c5c2eab8c1d1bd5ac9593fc30c9c096bd505d933d"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:40:11
[INFO] [stderr]    |
[INFO] [stderr] 40 |         let f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:51:3
[INFO] [stderr]    |
[INFO] [stderr] 51 |         try!(bw.write_all(sl));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:57:11
[INFO] [stderr]    |
[INFO] [stderr] 57 |         let f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:60:3
[INFO] [stderr]    |
[INFO] [stderr] 60 |         try!(write!(bw,"P2\n"));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:62:3
[INFO] [stderr]    |
[INFO] [stderr] 62 |         try!(write!(bw, "{} {}\n", self.header.width, self.header.height));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:64:3
[INFO] [stderr]    |
[INFO] [stderr] 64 |         try!(write!(bw, "{}\n", 65535)); 
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:67:4
[INFO] [stderr]    |
[INFO] [stderr] 67 |             try!(write!(bw, "{} ", d));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:73:15
[INFO] [stderr]    |
[INFO] [stderr] 73 |         let bytes = try!(bincode::encode(self, bincode::SizeLimit::Infinite));
[INFO] [stderr]    |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:74:18
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let mut file = try!(File::create(path));
[INFO] [stderr]    |                        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/image/mod.rs:75:3
[INFO] [stderr]    |
[INFO] [stderr] 75 |         try!(file.write_all(&bytes));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::error::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/image/mod.rs:72:57
[INFO] [stderr]    |
[INFO] [stderr] 72 |     pub fn serialize(&self, path: &str) ->  Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                                            ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `write_to_file`
[INFO] [stderr]   --> src/image/mod.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn write_to_file(&self, path: &str) -> std::io::Result<()> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `serialize`
[INFO] [stderr]   --> src/image/mod.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     pub fn serialize(&self, path: &str) ->  Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 15 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_multithread-34d72caebe0c23b2
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "c88f2d79287dac0b25d8094c5c2eab8c1d1bd5ac9593fc30c9c096bd505d933d"`
[INFO] running `"docker" "rm" "-f" "c88f2d79287dac0b25d8094c5c2eab8c1d1bd5ac9593fc30c9c096bd505d933d"`
[INFO] [stdout] c88f2d79287dac0b25d8094c5c2eab8c1d1bd5ac9593fc30c9c096bd505d933d