[INFO] crate reader-writer 0.0.2 is already in cache
[INFO] testing reader-writer-0.0.2 against 1.45.2 for beta-1.46-1
[INFO] extracting crate reader-writer 0.0.2 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate reader-writer 0.0.2 on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate reader-writer 0.0.2
[INFO] finished tweaking crates.io crate reader-writer 0.0.2
[INFO] tweaked toml for crates.io crate reader-writer 0.0.2 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ff221127b1a908fe5aaf410860338421d91d7a8c0ac5bb26643a63a12f0c6f7a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "ff221127b1a908fe5aaf410860338421d91d7a8c0ac5bb26643a63a12f0c6f7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff221127b1a908fe5aaf410860338421d91d7a8c0ac5bb26643a63a12f0c6f7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff221127b1a908fe5aaf410860338421d91d7a8c0ac5bb26643a63a12f0c6f7a", kill_on_drop: false }`
[INFO] [stdout] ff221127b1a908fe5aaf410860338421d91d7a8c0ac5bb26643a63a12f0c6f7a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fdc6f6f3ff09507a3fb6d7a2677b8dc3496251a1170b0b54d868ea12ca722fad
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fdc6f6f3ff09507a3fb6d7a2677b8dc3496251a1170b0b54d868ea12ca722fad", kill_on_drop: false }`
[INFO] [stderr]    Compiling reader-writer v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/reader.rs:95:25
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let len = match try!(self.read_u16()) {
[INFO] [stdout]    |                         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/reader.rs:102:17
[INFO] [stdout]     |
[INFO] [stdout] 102 |         let n = try!(self.read_bytes(&mut buf[..]));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/writer.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 119 |         try!(self.write_u16(buf.len() as u16));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/reader.rs:14:19
[INFO] [stdout]    |
[INFO] [stdout] 14 |     read: &'a mut Read
[INFO] [stdout]    |                   ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/reader.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn new(read: &'a mut Read) -> BasicReader {
[INFO] [stdout]    |                              ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/writer.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 |     write: &'a mut Write
[INFO] [stdout]    |                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/writer.rs:76:28
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn new(write: &mut Write) -> BasicWriter {
[INFO] [stdout]    |                            ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "fdc6f6f3ff09507a3fb6d7a2677b8dc3496251a1170b0b54d868ea12ca722fad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdc6f6f3ff09507a3fb6d7a2677b8dc3496251a1170b0b54d868ea12ca722fad", kill_on_drop: false }`
[INFO] [stdout] fdc6f6f3ff09507a3fb6d7a2677b8dc3496251a1170b0b54d868ea12ca722fad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 01dfb02840be9b6809625602a43e949e650a8bdaebbde0316ebc24fe4f78e1c0
[INFO] running `Command { std: "docker" "start" "-a" "01dfb02840be9b6809625602a43e949e650a8bdaebbde0316ebc24fe4f78e1c0", kill_on_drop: false }`
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/reader.rs:95:25
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let len = match try!(self.read_u16()) {
[INFO] [stdout]    |                         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling reader-writer v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/reader.rs:102:17
[INFO] [stdout]     |
[INFO] [stdout] 102 |         let n = try!(self.read_bytes(&mut buf[..]));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/writer.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 119 |         try!(self.write_u16(buf.len() as u16));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/reader.rs:14:19
[INFO] [stdout]    |
[INFO] [stdout] 14 |     read: &'a mut Read
[INFO] [stdout]    |                   ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/reader.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn new(read: &'a mut Read) -> BasicReader {
[INFO] [stdout]    |                              ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/writer.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 |     write: &'a mut Write
[INFO] [stdout]    |                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/writer.rs:76:28
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn new(write: &mut Write) -> BasicWriter {
[INFO] [stdout]    |                            ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/reader.rs:95:25
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let len = match try!(self.read_u16()) {
[INFO] [stdout]    |                         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/reader.rs:102:17
[INFO] [stdout]     |
[INFO] [stdout] 102 |         let n = try!(self.read_bytes(&mut buf[..]));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/writer.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 119 |         try!(self.write_u16(buf.len() as u16));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/reader.rs:14:19
[INFO] [stdout]    |
[INFO] [stdout] 14 |     read: &'a mut Read
[INFO] [stdout]    |                   ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/reader.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn new(read: &'a mut Read) -> BasicReader {
[INFO] [stdout]    |                              ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/writer.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 |     write: &'a mut Write
[INFO] [stdout]    |                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/writer.rs:76:28
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn new(write: &mut Write) -> BasicWriter {
[INFO] [stdout]    |                            ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "01dfb02840be9b6809625602a43e949e650a8bdaebbde0316ebc24fe4f78e1c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01dfb02840be9b6809625602a43e949e650a8bdaebbde0316ebc24fe4f78e1c0", kill_on_drop: false }`
[INFO] [stdout] 01dfb02840be9b6809625602a43e949e650a8bdaebbde0316ebc24fe4f78e1c0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6e00ed548fb6cad9cc267a9bf847dea219da1afeaa3fce04d4cb7091c2aa351e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6e00ed548fb6cad9cc267a9bf847dea219da1afeaa3fce04d4cb7091c2aa351e", kill_on_drop: false }`
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/reader.rs:95:25
[INFO] [stderr]    |
[INFO] [stderr] 95 |         let len = match try!(self.read_u16()) {
[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/reader.rs:102:17
[INFO] [stderr]     |
[INFO] [stderr] 102 |         let n = try!(self.read_bytes(&mut buf[..]));
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writer.rs:119:9
[INFO] [stderr]     |
[INFO] [stderr] 119 |         try!(self.write_u16(buf.len() as u16));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/reader.rs:14:19
[INFO] [stderr]    |
[INFO] [stderr] 14 |     read: &'a mut Read
[INFO] [stderr]    |                   ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/reader.rs:18:30
[INFO] [stderr]    |
[INFO] [stderr] 18 |     pub fn new(read: &'a mut Read) -> BasicReader {
[INFO] [stderr]    |                              ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/writer.rs:72:20
[INFO] [stderr]    |
[INFO] [stderr] 72 |     write: &'a mut Write
[INFO] [stderr]    |                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/writer.rs:76:28
[INFO] [stderr]    |
[INFO] [stderr] 76 |     pub fn new(write: &mut Write) -> BasicWriter {
[INFO] [stderr]    |                            ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/reader.rs:95:25
[INFO] [stderr]    |
[INFO] [stderr] 95 |         let len = match try!(self.read_u16()) {
[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/reader.rs:102:17
[INFO] [stderr]     |
[INFO] [stderr] 102 |         let n = try!(self.read_bytes(&mut buf[..]));
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/writer.rs:119:9
[INFO] [stderr]     |
[INFO] [stderr] 119 |         try!(self.write_u16(buf.len() as u16));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/reader.rs:14:19
[INFO] [stderr]    |
[INFO] [stderr] 14 |     read: &'a mut Read
[INFO] [stderr]    |                   ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/reader.rs:18:30
[INFO] [stderr]    |
[INFO] [stderr] 18 |     pub fn new(read: &'a mut Read) -> BasicReader {
[INFO] [stderr]    |                              ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/writer.rs:72:20
[INFO] [stderr]    |
[INFO] [stderr] 72 |     write: &'a mut Write
[INFO] [stderr]    |                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/writer.rs:76:28
[INFO] [stderr]    |
[INFO] [stderr] 76 |     pub fn new(write: &mut Write) -> BasicWriter {
[INFO] [stderr]    |                            ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/reader_writer-d3677a019d8be50f
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests reader-writer
[INFO] [stdout] running 8 tests
[INFO] [stdout] test tests::count_u8_one_byte ... ok
[INFO] [stdout] test tests::count_u64_eight_bytes ... ok
[INFO] [stdout] test tests::count_u16_two_bytes ... ok
[INFO] [stdout] test tests::count_string ... ok
[INFO] [stdout] test tests::count_bytes ... ok
[INFO] [stdout] test tests::count_str ... ok
[INFO] [stdout] test tests::count_u32_four_bytes ... ok
[INFO] [stdout] test tests::can_write_and_read ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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 `Command { std: "docker" "inspect" "6e00ed548fb6cad9cc267a9bf847dea219da1afeaa3fce04d4cb7091c2aa351e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e00ed548fb6cad9cc267a9bf847dea219da1afeaa3fce04d4cb7091c2aa351e", kill_on_drop: false }`
[INFO] [stdout] 6e00ed548fb6cad9cc267a9bf847dea219da1afeaa3fce04d4cb7091c2aa351e