[INFO] cloning repository https://github.com/arcesino/mncalc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arcesino/mncalc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farcesino%2Fmncalc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farcesino%2Fmncalc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3ec367340f48f2c90a18b0f7966e99d1f05b7afe
[INFO] testing arcesino/mncalc against 1.75.0 for beta-1.76-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farcesino%2Fmncalc" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/arcesino/mncalc on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/arcesino/mncalc
[INFO] finished tweaking git repo https://github.com/arcesino/mncalc
[INFO] tweaked toml for git repo https://github.com/arcesino/mncalc written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/arcesino/mncalc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded structopt-derive v0.2.14
[INFO] [stderr]   Downloaded serde_derive v1.0.82
[INFO] [stderr]   Downloaded heck v0.3.0
[INFO] [stderr]   Downloaded structopt v0.2.14
[INFO] [stderr]   Downloaded serde v1.0.82
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 728c358c31078357547985f2cf7eabc86da671a66358d40496f010eb49c47cb8
[INFO] running `Command { std: "docker" "start" "-a" "728c358c31078357547985f2cf7eabc86da671a66358d40496f010eb49c47cb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "728c358c31078357547985f2cf7eabc86da671a66358d40496f010eb49c47cb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "728c358c31078357547985f2cf7eabc86da671a66358d40496f010eb49c47cb8", kill_on_drop: false }`
[INFO] [stdout] 728c358c31078357547985f2cf7eabc86da671a66358d40496f010eb49c47cb8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 50e97a82c11b9591d309d61e092cbff2f7e18b890c3840dfd051f3d84e0a081c
[INFO] running `Command { std: "docker" "start" "-a" "50e97a82c11b9591d309d61e092cbff2f7e18b890c3840dfd051f3d84e0a081c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.45
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]    Compiling ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]    Compiling regex-syntax v0.6.4
[INFO] [stderr]    Compiling heck v0.3.0
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling syn v0.15.22
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling spectral v0.6.0
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[INFO] [stderr]    Compiling structopt v0.2.14
[INFO] [stderr]    Compiling mncalc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.92s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "50e97a82c11b9591d309d61e092cbff2f7e18b890c3840dfd051f3d84e0a081c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50e97a82c11b9591d309d61e092cbff2f7e18b890c3840dfd051f3d84e0a081c", kill_on_drop: false }`
[INFO] [stdout] 50e97a82c11b9591d309d61e092cbff2f7e18b890c3840dfd051f3d84e0a081c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f572373372fe77f582973568712f78b5d4d1d61aefb8f068a0d9aa0c604bbf2
[INFO] running `Command { std: "docker" "start" "-a" "4f572373372fe77f582973568712f78b5d4d1d61aefb8f068a0d9aa0c604bbf2", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.82
[INFO] [stderr]    Compiling serde_derive v1.0.82
[INFO] [stderr]    Compiling predicates v1.0.0
[INFO] [stderr]    Compiling serde_json v1.0.33
[INFO] [stderr]    Compiling escargot v0.3.1
[INFO] [stderr]    Compiling assert_cmd v0.10.2
[INFO] [stderr]    Compiling mncalc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> tests/cli_tests.rs:6:61
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn command_help_shows_usage_and_options() -> Result<(), Box<std::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]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn command_help_shows_usage_and_options() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]   |                                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/cli_tests.rs:19:48
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn run_with_short_eval_arg() -> Result<(), Box<std::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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn run_with_short_eval_arg() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/cli_tests.rs:31:47
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn run_with_long_eval_arg() -> Result<(), Box<std::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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn run_with_long_eval_arg() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/cli_tests.rs:43:69
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn run_with_unparseable_expression_prints_error() -> Result<(), Box<std::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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn run_with_unparseable_expression_prints_error() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/cli_tests.rs:55:77
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn run_with_fraction_with_zero_denominator_prints_error() -> Result<(), Box<std::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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn run_with_fraction_with_zero_denominator_prints_error() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/cli_tests.rs:67:57
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn run_with_no_args_start_repl_mode() -> Result<(), Box<std::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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn run_with_no_args_start_repl_mode() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/cli_tests.rs:82:50
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn run_repl_mode_with_errors() -> Result<(), Box<std::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: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn run_repl_mode_with_errors() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 11.11s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "4f572373372fe77f582973568712f78b5d4d1d61aefb8f068a0d9aa0c604bbf2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f572373372fe77f582973568712f78b5d4d1d61aefb8f068a0d9aa0c604bbf2", kill_on_drop: false }`
[INFO] [stdout] 4f572373372fe77f582973568712f78b5d4d1d61aefb8f068a0d9aa0c604bbf2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] a879d0e26fdd1d084de7ae53ddca58cd0da711c404194c1d40b0910061465534
[INFO] running `Command { std: "docker" "start" "-a" "a879d0e26fdd1d084de7ae53ddca58cd0da711c404194c1d40b0910061465534", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> tests/cli_tests.rs:6:61
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn command_help_shows_usage_and_options() -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]   |                                                             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2018) 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]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn command_help_shows_usage_and_options() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]   |                                                             +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/cli_tests.rs:19:48
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn run_with_short_eval_arg() -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                                ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) 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] 19 | fn run_with_short_eval_arg() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |                                                +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/cli_tests.rs:31:47
[INFO] [stderr]    |
[INFO] [stderr] 31 | fn run_with_long_eval_arg() -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                               ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) 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] 31 | fn run_with_long_eval_arg() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |                                               +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/cli_tests.rs:43:69
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn run_with_unparseable_expression_prints_error() -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                                                     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) 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] 43 | fn run_with_unparseable_expression_prints_error() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |                                                                     +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/cli_tests.rs:55:77
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn run_with_fraction_with_zero_denominator_prints_error() -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                                                             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) 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] 55 | fn run_with_fraction_with_zero_denominator_prints_error() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |                                                                             +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/cli_tests.rs:67:57
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn run_with_no_args_start_repl_mode() -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                                         ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) 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] 67 | fn run_with_no_args_start_repl_mode() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |                                                         +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/cli_tests.rs:82:50
[INFO] [stderr]    |
[INFO] [stderr] 82 | fn run_repl_mode_with_errors() -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                                                  ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) 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] 82 | fn run_repl_mode_with_errors() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |                                                  +++
[INFO] [stderr] 
[INFO] [stderr] warning: `mncalc` (test "cli_tests") generated 7 warnings (run `cargo fix --test "cli_tests"` to apply 7 suggestions)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/mncalc-62d975c4fa07e0c3)
[INFO] [stdout] 
[INFO] [stdout] running 29 tests
[INFO] [stdout] test fraction::tests::display_improper_fraction_as_mixed_number ... ok
[INFO] [stdout] test fraction::tests::display_zero_fraction ... ok
[INFO] [stdout] test fraction::tests::divide_fractions ... ok
[INFO] [stdout] test fraction::tests::display_negative_proper_fraction ... ok
[INFO] [stdout] test fraction::tests::display_exact_fraction_as_integer ... ok
[INFO] [stdout] test fraction::tests::add_fractions ... ok
[INFO] [stdout] test fraction::tests::display_proper_fraction ... ok
[INFO] [stdout] test fraction::tests::is_fraction_with_invalid_expression ... ok
[INFO] [stdout] test fraction::tests::multiply_fractions ... ok
[INFO] [stdout] test fraction::tests::new_simplifies_fraction ... ok
[INFO] [stdout] test fraction::tests::is_fraction_with_valid_expression ... ok
[INFO] [stdout] test fraction::tests::parse_fraction_with_valid_expresion ... ok
[INFO] [stdout] test fraction::tests::substract_fractions ... ok
[INFO] [stdout] test fraction::tests::parse_fraction_with_negative_elements ... ok
[INFO] [stdout] test mixed_number::tests::parse_full_negative_mixed_number ... ok
[INFO] [stdout] test operation::tests::compute_addition ... ok
[INFO] [stdout] test mixed_number::tests::parse_fraction_only_mixed_number ... ok
[INFO] [stdout] test mixed_number::tests::parse_full_mixed_number ... ok
[INFO] [stdout] test operation::tests::compute_multiplication ... ok
[INFO] [stdout] test operation::tests::compute_division ... ok
[INFO] [stdout] test operation::tests::parse_operation_with_valid_expressions ... ok
[INFO] [stdout] test fraction::tests::parse_fraction_with_valid_negative_expresion ... ok
[INFO] [stdout] test operation::tests::compute_substraction ... ok
[INFO] [stdout] test mixed_number::tests::parse_whole_only_mixed_number ... ok
[INFO] [stdout] test fraction::tests::divide_fractions_by_zero - should panic ... ok
[INFO] [stdout] test fraction::tests::parse_fraction_with_invalid_expresion - should panic ... ok
[INFO] [stdout] test fraction::tests::new_with_zero_denominator - should panic ... ok
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/mncalc-6162cefb5990d341)
[INFO] [stdout] test operation::tests::parse_operation_with_invalid_expression - should panic ... ok
[INFO] [stdout] test mixed_number::tests::parse_as_fraction_with_invalid_expresion - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 29 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.13s
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/cli_tests.rs (/opt/rustwide/target/debug/deps/cli_tests-63c0d4f57c3c9340)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test run_repl_mode_with_errors ... ok
[INFO] [stdout] test run_with_long_eval_arg ... ok
[INFO] [stdout] test run_with_short_eval_arg ... ok
[INFO] [stdout] test command_help_shows_usage_and_options ... ok
[INFO] [stdout] test run_with_fraction_with_zero_denominator_prints_error ... ok
[INFO] [stdout] test run_with_no_args_start_repl_mode ... ok
[INFO] [stdout] test run_with_unparseable_expression_prints_error ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 9.57s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mncalc
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a879d0e26fdd1d084de7ae53ddca58cd0da711c404194c1d40b0910061465534", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a879d0e26fdd1d084de7ae53ddca58cd0da711c404194c1d40b0910061465534", kill_on_drop: false }`
[INFO] [stdout] a879d0e26fdd1d084de7ae53ddca58cd0da711c404194c1d40b0910061465534
[INFO] testing arcesino/mncalc against beta-2024-01-09 for beta-1.76-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farcesino%2Fmncalc" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/arcesino/mncalc on toolchain beta-2024-01-09
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-01-09" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/arcesino/mncalc
[INFO] finished tweaking git repo https://github.com/arcesino/mncalc
[INFO] tweaked toml for git repo https://github.com/arcesino/mncalc written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/arcesino/mncalc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-01-09" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+beta-2024-01-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 13f2c326241dda1e4d8ca86ca5b1ef7f6ee2a42f0f03bf0f5377221a3a0446da
[INFO] running `Command { std: "docker" "start" "-a" "13f2c326241dda1e4d8ca86ca5b1ef7f6ee2a42f0f03bf0f5377221a3a0446da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13f2c326241dda1e4d8ca86ca5b1ef7f6ee2a42f0f03bf0f5377221a3a0446da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13f2c326241dda1e4d8ca86ca5b1ef7f6ee2a42f0f03bf0f5377221a3a0446da", kill_on_drop: false }`
[INFO] [stdout] 13f2c326241dda1e4d8ca86ca5b1ef7f6ee2a42f0f03bf0f5377221a3a0446da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-01-09" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ab8bfdb3b269879b7d40541e8f256a966812bfd9dd9b0bd56ae58346e7dc9500
[INFO] running `Command { std: "docker" "start" "-a" "ab8bfdb3b269879b7d40541e8f256a966812bfd9dd9b0bd56ae58346e7dc9500", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.45
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]    Compiling ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]    Compiling regex-syntax v0.6.4
[INFO] [stdout] error[E0310]: the parameter type `T` may not live long enough
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/rustc-serialize-0.3.24/src/serialize.rs:1155:5
[INFO] [stdout]      |
[INFO] [stdout] 1155 |     fn decode<D: Decoder>(d: &mut D) -> Result<Cow<'static, T>, D::Error> {
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |     |
[INFO] [stdout]      |     the parameter type `T` must be valid for the static lifetime...
[INFO] [stdout]      |     ...so that the type `T` will meet its required lifetime bounds...
[INFO] [stdout]      |
[INFO] [stdout] note: ...that is required by this bound
[INFO] [stdout]     --> /rustc/650745ceb2ae60e04f8cd7bfb671fc37239533e4/library/alloc/src/borrow.rs:180:30
[INFO] [stdout] help: consider adding an explicit lifetime bound
[INFO] [stdout]      |
[INFO] [stdout] 1151 | impl<'a, T: ?Sized + 'static> Decodable for Cow<'a, T>
[INFO] [stdout]      |                    +++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling heck v0.3.0
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling syn v0.15.22
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0310`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc-serialize` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ab8bfdb3b269879b7d40541e8f256a966812bfd9dd9b0bd56ae58346e7dc9500", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab8bfdb3b269879b7d40541e8f256a966812bfd9dd9b0bd56ae58346e7dc9500", kill_on_drop: false }`
[INFO] [stdout] ab8bfdb3b269879b7d40541e8f256a966812bfd9dd9b0bd56ae58346e7dc9500
