[INFO] fetching crate ecoji 1.0.0...
[INFO] testing ecoji-1.0.0 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate ecoji 1.0.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate ecoji 1.0.0 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ecoji 1.0.0
[INFO] finished tweaking crates.io crate ecoji 1.0.0
[INFO] tweaked toml for crates.io crate ecoji 1.0.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3ac31d187e519efed8d9d29b9d36e5edfe1c1ef31eb525db2e9099a228e2769b
[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" "3ac31d187e519efed8d9d29b9d36e5edfe1c1ef31eb525db2e9099a228e2769b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3ac31d187e519efed8d9d29b9d36e5edfe1c1ef31eb525db2e9099a228e2769b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ac31d187e519efed8d9d29b9d36e5edfe1c1ef31eb525db2e9099a228e2769b", kill_on_drop: false }`
[INFO] [stdout] 3ac31d187e519efed8d9d29b9d36e5edfe1c1ef31eb525db2e9099a228e2769b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ce43c371926db90254cedc89c08e942ae2e8401ab71c848323c0940040c66f8
[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" "2ce43c371926db90254cedc89c08e942ae2e8401ab71c848323c0940040c66f8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling ecoji v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> build.rs:21:28
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn run() -> Result<(), Box<Error>> {
[INFO] [stdout]    |                            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) 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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 21 - fn run() -> Result<(), Box<Error>> {
[INFO] [stdout] 21 + fn run() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/chars.rs:66:59
[INFO] [stdout]    |
[INFO] [stdout] 66 |             CharsError::Other(ref e) => std_error::Error::description(e),
[INFO] [stdout]    |                                                           ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/chars.rs:86:31
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn read_one_byte(reader: &mut Read) -> Option<Result<u8>> {
[INFO] [stdout]    |                               ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) 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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 86 - fn read_one_byte(reader: &mut Read) -> Option<Result<u8>> {
[INFO] [stdout] 86 + fn read_one_byte(reader: &mut dyn Read) -> Option<Result<u8>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/chars.rs:69:32
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn cause(&self) -> Option<&std_error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) 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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 69 -     fn cause(&self) -> Option<&std_error::Error> {
[INFO] [stdout] 69 +     fn cause(&self) -> Option<&dyn std_error::Error> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::cause`: replaced by Error::source, which can support downcasting
[INFO] [stdout]   --> src/chars.rs:72:43
[INFO] [stdout]    |
[INFO] [stdout] 72 |             CharsError::Other(ref e) => e.cause(),
[INFO] [stdout]    |                                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.55s
[INFO] running `Command { std: "docker" "inspect" "2ce43c371926db90254cedc89c08e942ae2e8401ab71c848323c0940040c66f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ce43c371926db90254cedc89c08e942ae2e8401ab71c848323c0940040c66f8", kill_on_drop: false }`
[INFO] [stdout] 2ce43c371926db90254cedc89c08e942ae2e8401ab71c848323c0940040c66f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4a6f138c5ed645fae673035804d244f8074734b16a4d9ffff510de1abf4e0be
[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" "e4a6f138c5ed645fae673035804d244f8074734b16a4d9ffff510de1abf4e0be", kill_on_drop: false }`
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> build.rs:21:28
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn run() -> Result<(), Box<Error>> {
[INFO] [stdout]    |                            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) 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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 21 - fn run() -> Result<(), Box<Error>> {
[INFO] [stdout] 21 + fn run() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/chars.rs:66:59
[INFO] [stdout]    |
[INFO] [stdout] 66 |             CharsError::Other(ref e) => std_error::Error::description(e),
[INFO] [stdout]    |                                                           ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/chars.rs:86:31
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn read_one_byte(reader: &mut Read) -> Option<Result<u8>> {
[INFO] [stdout]    |                               ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) 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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 86 - fn read_one_byte(reader: &mut Read) -> Option<Result<u8>> {
[INFO] [stdout] 86 + fn read_one_byte(reader: &mut dyn Read) -> Option<Result<u8>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/chars.rs:69:32
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn cause(&self) -> Option<&std_error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) 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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 69 -     fn cause(&self) -> Option<&std_error::Error> {
[INFO] [stdout] 69 +     fn cause(&self) -> Option<&dyn std_error::Error> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::cause`: replaced by Error::source, which can support downcasting
[INFO] [stdout]   --> src/chars.rs:72:43
[INFO] [stdout]    |
[INFO] [stdout] 72 |             CharsError::Other(ref e) => e.cause(),
[INFO] [stdout]    |                                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling quickcheck v0.6.2
[INFO] [stderr]    Compiling ecoji v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/chars.rs:66:59
[INFO] [stdout]    |
[INFO] [stdout] 66 |             CharsError::Other(ref e) => std_error::Error::description(e),
[INFO] [stdout]    |                                                           ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/chars.rs:86:31
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn read_one_byte(reader: &mut Read) -> Option<Result<u8>> {
[INFO] [stdout]    |                               ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) 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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 86 - fn read_one_byte(reader: &mut Read) -> Option<Result<u8>> {
[INFO] [stdout] 86 + fn read_one_byte(reader: &mut dyn Read) -> Option<Result<u8>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/chars.rs:69:32
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn cause(&self) -> Option<&std_error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) 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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 69 -     fn cause(&self) -> Option<&std_error::Error> {
[INFO] [stdout] 69 +     fn cause(&self) -> Option<&dyn std_error::Error> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::cause`: replaced by Error::source, which can support downcasting
[INFO] [stdout]   --> src/chars.rs:72:43
[INFO] [stdout]    |
[INFO] [stdout] 72 |             CharsError::Other(ref e) => e.cause(),
[INFO] [stdout]    |                                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 6.61s
[INFO] running `Command { std: "docker" "inspect" "e4a6f138c5ed645fae673035804d244f8074734b16a4d9ffff510de1abf4e0be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4a6f138c5ed645fae673035804d244f8074734b16a4d9ffff510de1abf4e0be", kill_on_drop: false }`
[INFO] [stdout] e4a6f138c5ed645fae673035804d244f8074734b16a4d9ffff510de1abf4e0be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7dd814abb94f1624ebb7d2c94c0e6cbf3b46b1de206a0b0acc34f111e857047f
[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" "7dd814abb94f1624ebb7d2c94c0e6cbf3b46b1de206a0b0acc34f111e857047f", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> build.rs:21:28
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn run() -> Result<(), Box<Error>> {
[INFO] [stderr]    |                            ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 21 - fn run() -> Result<(), Box<Error>> {
[INFO] [stderr] 21 + fn run() -> Result<(), Box<dyn Error>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: `ecoji` (build script) generated 1 warning
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]   --> src/chars.rs:66:59
[INFO] [stderr]    |
[INFO] [stderr] 66 |             CharsError::Other(ref e) => std_error::Error::description(e),
[INFO] [stderr]    |                                                           ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/chars.rs:86:31
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn read_one_byte(reader: &mut Read) -> Option<Result<u8>> {
[INFO] [stderr]    |                               ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 86 - fn read_one_byte(reader: &mut Read) -> Option<Result<u8>> {
[INFO] [stderr] 86 + fn read_one_byte(reader: &mut dyn Read) -> Option<Result<u8>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/chars.rs:69:32
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn cause(&self) -> Option<&std_error::Error> {
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 69 -     fn cause(&self) -> Option<&std_error::Error> {
[INFO] [stderr] 69 +     fn cause(&self) -> Option<&dyn std_error::Error> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::cause`: replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/chars.rs:72:43
[INFO] [stderr]    |
[INFO] [stderr] 72 |             CharsError::Other(ref e) => e.cause(),
[INFO] [stderr]    |                                           ^^^^^
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: `ecoji` (lib) generated 4 warnings
[INFO] [stdout] running 15 tests
[INFO] [stderr] warning: `ecoji` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stdout] test decode::tests::test_five_bytes ... ok
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stdout] test decode::tests::test_one_byte ... ok
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/ecoji-5c9fd55d53935803)
[INFO] [stdout] test decode::tests::test_random ... ok
[INFO] [stdout] test decode::tests::test_two_bytes ... ok
[INFO] [stdout] test decode::tests::test_four_bytes ... ok
[INFO] [stdout] test encode::tests::test_four_bytes ... ok
[INFO] [stdout] test encode::tests::test_one_byte ... ok
[INFO] [stdout] test emojis::test_mapping ... ok
[INFO] [stdout] test decode::tests::test_three_bytes ... ok
[INFO] [stdout] test encode::tests::test_random ... ok
[INFO] [stdout] test encode::tests::test_three_bytes ... ok
[INFO] [stdout] test encode::tests::test_two_bytes ... ok
[INFO] [stdout] test encode::tests::test_five_bytes ... ok
[INFO] [stdout] test test::encode_then_decode_identity ... ok
[INFO] [stdout] test test::encoded_data_has_the_same_sort_order ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 15 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.77s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests ecoji
[INFO] [stdout] 
[INFO] [stdout] running 12 tests
[INFO] [stdout] test src/lib.rs - (line 91) ... ok
[INFO] [stdout] test src/decode.rs - decode::decode (line 21) ... ok
[INFO] [stdout] test src/decode.rs - decode::decode_to_string (line 191) ... ok
[INFO] [stdout] test src/decode.rs - decode::decode (line 50) ... ok
[INFO] [stdout] test src/encode.rs - encode::encode (line 92) ... ok
[INFO] [stdout] test src/decode.rs - decode::decode (line 36) ... ok
[INFO] [stdout] test src/encode.rs - encode::encode_to_string (line 135) ... ok
[INFO] [stdout] test src/decode.rs - decode::decode_to_string (line 178) ... ok
[INFO] [stdout] test src/decode.rs - decode::decode (line 64) ... ok
[INFO] [stdout] test src/decode.rs - decode::decode_to_vec (line 148) ... ok
[INFO] [stdout] test src/lib.rs - (line 21) ... ok
[INFO] [stdout] test src/lib.rs - (line 43) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 5.58s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "7dd814abb94f1624ebb7d2c94c0e6cbf3b46b1de206a0b0acc34f111e857047f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7dd814abb94f1624ebb7d2c94c0e6cbf3b46b1de206a0b0acc34f111e857047f", kill_on_drop: false }`
[INFO] [stdout] 7dd814abb94f1624ebb7d2c94c0e6cbf3b46b1de206a0b0acc34f111e857047f