[INFO] cloning repository https://github.com/zerocode/fix_engine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zerocode/fix_engine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzerocode%2Ffix_engine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzerocode%2Ffix_engine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3de33a80fc6dad32c6399fb027ce6f5dc315d78d
[INFO] checking zerocode/fix_engine against master#667247db71ea18c4130dd018d060e7f09d589490 for pr-140824
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzerocode%2Ffix_engine" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zerocode/fix_engine on toolchain 667247db71ea18c4130dd018d060e7f09d589490
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+667247db71ea18c4130dd018d060e7f09d589490" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zerocode/fix_engine
[INFO] finished tweaking git repo https://github.com/zerocode/fix_engine
[INFO] tweaked toml for git repo https://github.com/zerocode/fix_engine written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/zerocode/fix_engine 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" "+667247db71ea18c4130dd018d060e7f09d589490" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+667247db71ea18c4130dd018d060e7f09d589490" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 267a8ccac85e3c7cd0f52137ff71b8e67b8b7a7d5f3ab193b1977ef8eed9b1df
[INFO] running `Command { std: "docker" "start" "-a" "267a8ccac85e3c7cd0f52137ff71b8e67b8b7a7d5f3ab193b1977ef8eed9b1df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "267a8ccac85e3c7cd0f52137ff71b8e67b8b7a7d5f3ab193b1977ef8eed9b1df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "267a8ccac85e3c7cd0f52137ff71b8e67b8b7a7d5f3ab193b1977ef8eed9b1df", kill_on_drop: false }`
[INFO] [stdout] 267a8ccac85e3c7cd0f52137ff71b8e67b8b7a7d5f3ab193b1977ef8eed9b1df
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+667247db71ea18c4130dd018d060e7f09d589490" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2828c3850d346d0f49fb70c6840cf85356ef177a7b5bbb1c0821fa2d0757d5ac
[INFO] running `Command { std: "docker" "start" "-a" "2828c3850d346d0f49fb70c6840cf85356ef177a7b5bbb1c0821fa2d0757d5ac", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.87
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]     Checking once_cell v1.20.2
[INFO] [stderr]    Compiling autocfg v1.4.0
[INFO] [stderr]     Checking overload v0.1.1
[INFO] [stderr]     Checking lazy_static v1.5.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking log v0.4.22
[INFO] [stderr]     Checking smallvec v1.13.2
[INFO] [stderr]     Checking nu-ansi-term v0.46.0
[INFO] [stderr]     Checking sharded-slab v0.1.7
[INFO] [stderr]     Checking pin-project-lite v0.2.14
[INFO] [stderr]     Checking iana-time-zone v0.1.61
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking thread_local v1.1.8
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking tracing-log v0.2.0
[INFO] [stderr]     Checking tracing-subscriber v0.3.18
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.79
[INFO] [stderr]     Checking chrono v0.4.38
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]    Compiling ctor v0.2.8
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking fix_engine_2 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::clock::Clock`
[INFO] [stdout]  --> src/message_optimised.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::clock::Clock;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/message_optimised.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::clock::Clock`
[INFO] [stdout]  --> src/message_optimised.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::clock::Clock;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/message_optimised.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `tag::CompID` is more private than the item `tag::FixTag::SenderCompID::0`
[INFO] [stdout]    --> src/tag.rs:168:18
[INFO] [stdout]     |
[INFO] [stdout] 168 |     SenderCompID(CompID),
[INFO] [stdout]     |                  ^^^^^^ field `tag::FixTag::SenderCompID::0` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `tag::CompID` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/tag.rs:12:1
[INFO] [stdout]     |
[INFO] [stdout] 12  | pub(crate) struct CompID(pub String); // Use &'static str instead of String.
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `tag::CompID` is more private than the item `tag::FixTag::TargetCompID::0`
[INFO] [stdout]    --> src/tag.rs:169:18
[INFO] [stdout]     |
[INFO] [stdout] 169 |     TargetCompID(CompID),
[INFO] [stdout]     |                  ^^^^^^ field `tag::FixTag::TargetCompID::0` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `tag::CompID` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/tag.rs:12:1
[INFO] [stdout]     |
[INFO] [stdout] 12  | pub(crate) struct CompID(pub String); // Use &'static str instead of String.
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `tag::PossDupFlag` is more private than the item `tag::FixTag::PossDupFlag::0`
[INFO] [stdout]    --> src/tag.rs:175:17
[INFO] [stdout]     |
[INFO] [stdout] 175 |     PossDupFlag(PossDupFlag),
[INFO] [stdout]     |                 ^^^^^^^^^^^ field `tag::FixTag::PossDupFlag::0` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `tag::PossDupFlag` is only usable at visibility `pub(self)`
[INFO] [stdout]    --> src/tag.rs:35:1
[INFO] [stdout]     |
[INFO] [stdout] 35  | enum PossDupFlag {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `CHECKSUM_TAG` is never used
[INFO] [stdout]  --> src/tag.rs:2:7
[INFO] [stdout]   |
[INFO] [stdout] 2 | const CHECKSUM_TAG: &str = "10";
[INFO] [stdout]   |       ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `REQUIRED_HEADER_FIELDS` is never used
[INFO] [stdout]  --> src/tag.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | const REQUIRED_HEADER_FIELDS: [&str; 7] = ["8", "9", "35", "49", "56", "34", "52"];
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `No` is never constructed
[INFO] [stdout]   --> src/tag.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | enum PossDupFlag {
[INFO] [stdout]    |      ----------- variant in this enum
[INFO] [stdout] 36 |     Yes,
[INFO] [stdout] 37 |     No,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PossDupFlag` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/tag.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl PossDupFlag {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 41 |     fn from_str(value: &str) -> Result<Self, &'static str> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/engine_factory.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         engine.start(stream, outgoing_receiver, incoming_sender);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let _ = engine.start(stream, outgoing_receiver, incoming_sender);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/engine_factory.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         engine.start(stream, outgoing_receiver, incoming_sender);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let _ = engine.start(stream, outgoing_receiver, incoming_sender);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `CompID` is more private than the item `tag::FixTag::SenderCompID::0`
[INFO] [stdout]    --> src/tag.rs:168:18
[INFO] [stdout]     |
[INFO] [stdout] 168 |     SenderCompID(CompID),
[INFO] [stdout]     |                  ^^^^^^ field `tag::FixTag::SenderCompID::0` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `CompID` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/tag.rs:12:1
[INFO] [stdout]     |
[INFO] [stdout] 12  | pub(crate) struct CompID(pub String); // Use &'static str instead of String.
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `CompID` is more private than the item `tag::FixTag::TargetCompID::0`
[INFO] [stdout]    --> src/tag.rs:169:18
[INFO] [stdout]     |
[INFO] [stdout] 169 |     TargetCompID(CompID),
[INFO] [stdout]     |                  ^^^^^^ field `tag::FixTag::TargetCompID::0` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `CompID` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/tag.rs:12:1
[INFO] [stdout]     |
[INFO] [stdout] 12  | pub(crate) struct CompID(pub String); // Use &'static str instead of String.
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `PossDupFlag` is more private than the item `tag::FixTag::PossDupFlag::0`
[INFO] [stdout]    --> src/tag.rs:175:17
[INFO] [stdout]     |
[INFO] [stdout] 175 |     PossDupFlag(PossDupFlag),
[INFO] [stdout]     |                 ^^^^^^^^^^^ field `tag::FixTag::PossDupFlag::0` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `PossDupFlag` is only usable at visibility `pub(self)`
[INFO] [stdout]    --> src/tag.rs:35:1
[INFO] [stdout]     |
[INFO] [stdout] 35  | enum PossDupFlag {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `CHECKSUM_TAG` is never used
[INFO] [stdout]  --> src/tag.rs:2:7
[INFO] [stdout]   |
[INFO] [stdout] 2 | const CHECKSUM_TAG: &str = "10";
[INFO] [stdout]   |       ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `REQUIRED_HEADER_FIELDS` is never used
[INFO] [stdout]  --> src/tag.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | const REQUIRED_HEADER_FIELDS: [&str; 7] = ["8", "9", "35", "49", "56", "34", "52"];
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/tag.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl CompID {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 15 |     fn new(id: String) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Yes` and `No` are never constructed
[INFO] [stdout]   --> src/tag.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | enum PossDupFlag {
[INFO] [stdout]    |      ----------- variants in this enum
[INFO] [stdout] 36 |     Yes,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 37 |     No,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PossDupFlag` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/tag.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl PossDupFlag {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 41 |     fn from_str(value: &str) -> Result<Self, &'static str> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FixMessage2` is never constructed
[INFO] [stdout]  --> src/message_optimised.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct FixMessage2 {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `encode` is never used
[INFO] [stdout]   --> src/message_optimised.rs:12:19
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl FixMessage2 {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] 12 |     pub(crate) fn encode(&mut self) -> String {
[INFO] [stdout]    |                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_body_length` is never used
[INFO] [stdout]   --> src/message_optimised.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn calculate_body_length(message: &FixMessage2) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_checksum` is never used
[INFO] [stdout]   --> src/message_optimised.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn calculate_checksum(fix_str: String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `int_to_str_no_alloc` is never used
[INFO] [stdout]   --> src/message_optimised.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn int_to_str_no_alloc(n: usize, buffer: &mut [u8]) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/message_optimised.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 75 | impl FixMessage2 {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 76 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/engine_factory.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         engine.start(stream, outgoing_receiver, incoming_sender);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let _ = engine.start(stream, outgoing_receiver, incoming_sender);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/engine_factory.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         engine.start(stream, outgoing_receiver, incoming_sender);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let _ = engine.start(stream, outgoing_receiver, incoming_sender);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `used_linker`
[INFO] [stdout]   --> tests/integration_tests.rs:66:1
[INFO] [stdout]    |
[INFO] [stdout] 66 | #[ctor::ctor]
[INFO] [stdout]    | ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: no expected values for `feature`
[INFO] [stdout]    = note: using a cfg inside a attribute macro will use the cfgs from the destination crate and not the ones from the defining crate
[INFO] [stdout]    = help: try referring to `ctor::ctor` crate for guidance on how handle this unexpected cfg
[INFO] [stdout]    = help: the attribute macro `ctor::ctor` may come from an old version of the `ctor` crate, try updating your dependency with `cargo update -p ctor`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout]    = note: this warning originates in the attribute macro `ctor::ctor` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.87s
[INFO] running `Command { std: "docker" "inspect" "2828c3850d346d0f49fb70c6840cf85356ef177a7b5bbb1c0821fa2d0757d5ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2828c3850d346d0f49fb70c6840cf85356ef177a7b5bbb1c0821fa2d0757d5ac", kill_on_drop: false }`
[INFO] [stdout] 2828c3850d346d0f49fb70c6840cf85356ef177a7b5bbb1c0821fa2d0757d5ac