[INFO] cloning repository https://github.com/Malax/libcnb
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Malax/libcnb" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMalax%2Flibcnb", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMalax%2Flibcnb'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 820a77379c85e977e99a1b515321efef3cb38211
[INFO] checking Malax/libcnb against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMalax%2Flibcnb" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Malax/libcnb
[INFO] finished tweaking git repo https://github.com/Malax/libcnb
[INFO] tweaked toml for git repo https://github.com/Malax/libcnb written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Malax/libcnb on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 280 packages to latest Rust 1.85 compatible versions
[INFO] [stderr]       Adding cargo-platform v0.3.0 (available: v0.3.1, requires Rust 1.86)
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[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "180bd6768ae4502a76a23aaf78b56b4443a2e942bc2eeb3ab0909f0bc36e0c7f", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=forbid -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stderr]     Checking libcnb-package v0.30.1 (/opt/rustwide/workdir/libcnb-package)
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<BuildpackId>, Infallible>
[INFO] [stdout]    --> libcnb-package/src/buildpack_dependency_graph.rs:106:68
[INFO] [stdout]     |
[INFO] [stdout] 106 |       fn dependencies(&self) -> Result<Vec<BuildpackId>, Infallible> {
[INFO] [stdout]     |  ____________________________________________________________________^
[INFO] [stdout] 107 | |         Ok(self.dependencies.clone())
[INFO] [stdout] 108 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<BuildpackId>, Infallible>
[INFO] [stdout]    --> libcnb-package/src/buildpack_dependency_graph.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |         Ok(self.dependencies.clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libcnb-package` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<BuildpackId>, Infallible>
[INFO] [stdout]    --> libcnb-package/src/buildpack_dependency_graph.rs:106:68
[INFO] [stdout]     |
[INFO] [stdout] 106 |       fn dependencies(&self) -> Result<Vec<BuildpackId>, Infallible> {
[INFO] [stdout]     |  ____________________________________________________________________^
[INFO] [stdout] 107 | |         Ok(self.dependencies.clone())
[INFO] [stdout] 108 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<BuildpackId>, Infallible>
[INFO] [stdout]    --> libcnb-package/src/buildpack_dependency_graph.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |         Ok(self.dependencies.clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, Infallible>
[INFO] [stdout]    --> libcnb-package/src/dependency_graph.rs:118:67
[INFO] [stdout]     |
[INFO] [stdout] 118 |           fn dependencies(&self) -> Result<Vec<String>, Infallible> {
[INFO] [stdout]     |  ___________________________________________________________________^
[INFO] [stdout] 119 | |             Ok(self
[INFO] [stdout] 120 | |                 .1
[INFO] [stdout] 121 | |                 .iter()
[INFO] [stdout] 122 | |                 .map(std::string::ToString::to_string)
[INFO] [stdout] 123 | |                 .collect())
[INFO] [stdout] 124 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, Infallible>
[INFO] [stdout]    --> libcnb-package/src/dependency_graph.rs:119:13
[INFO] [stdout]     |
[INFO] [stdout] 119 | /             Ok(self
[INFO] [stdout] 120 | |                 .1
[INFO] [stdout] 121 | |                 .iter()
[INFO] [stdout] 122 | |                 .map(std::string::ToString::to_string)
[INFO] [stdout] 123 | |                 .collect())
[INFO] [stdout]     | |___________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libcnb-package` (lib test) due to 4 previous errors
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]   --> libcnb/src/layer/trait_api/tests.rs:65:85
[INFO] [stdout]    |
[INFO] [stdout] 65 |       ) -> Result<LayerResult<Self::Metadata>, <Self::Buildpack as Buildpack>::Error> {
[INFO] [stdout]    |  _____________________________________________________________________________________^
[INFO] [stdout] 66 | |         fs::write(
[INFO] [stdout] 67 | |             layer_path.join(TEST_LAYER_CREATE_FILE_NAME),
[INFO] [stdout] 68 | |             TEST_LAYER_CREATE_FILE_CONTENTS,
[INFO] [stdout] ...  |
[INFO] [stdout] 76 | |         .build()
[INFO] [stdout] 77 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]   --> libcnb/src/layer/trait_api/tests.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 72 | /         LayerResultBuilder::new(TestLayerMetadata {
[INFO] [stdout] 73 | |             version: self.write_version.clone(),
[INFO] [stdout] 74 | |         })
[INFO] [stdout] 75 | |         .env(self.write_layer_env.clone().unwrap_or_default())
[INFO] [stdout] 76 | |         .build()
[INFO] [stdout]    | |________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::ExistingLayerStrategy, TestBuildpackError>
[INFO] [stdout]   --> libcnb/src/layer/trait_api/tests.rs:83:79
[INFO] [stdout]    |
[INFO] [stdout] 83 |       ) -> Result<ExistingLayerStrategy, <Self::Buildpack as Buildpack>::Error> {
[INFO] [stdout]    |  _______________________________________________________________________________^
[INFO] [stdout] 84 | |         Ok(self.existing_layer_strategy)
[INFO] [stdout] 85 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::ExistingLayerStrategy, TestBuildpackError>
[INFO] [stdout]   --> libcnb/src/layer/trait_api/tests.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 84 |         Ok(self.existing_layer_strategy)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]   --> libcnb/src/layer/trait_api/tests.rs:91:85
[INFO] [stdout]    |
[INFO] [stdout] 91 |       ) -> Result<LayerResult<Self::Metadata>, <Self::Buildpack as Buildpack>::Error> {
[INFO] [stdout]    |  _____________________________________________________________________________________^
[INFO] [stdout] 92 | |         fs::write(
[INFO] [stdout] 93 | |             layer_data.path.join(TEST_LAYER_UPDATE_FILE_NAME),
[INFO] [stdout] 94 | |             TEST_LAYER_UPDATE_FILE_CONTENTS,
[INFO] [stdout] ...  |
[INFO] [stdout] 98 | |         LayerResultBuilder::new(layer_data.content_metadata.metadata.clone()).build()
[INFO] [stdout] 99 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]   --> libcnb/src/layer/trait_api/tests.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |         LayerResultBuilder::new(layer_data.content_metadata.metadata.clone()).build()
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::MetadataMigration<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:105:91
[INFO] [stdout]     |
[INFO] [stdout] 105 |       ) -> Result<MetadataMigration<Self::Metadata>, <Self::Buildpack as Buildpack>::Error> {
[INFO] [stdout]     |  ___________________________________________________________________________________________^
[INFO] [stdout] 106 | |         match metadata.clone().and_then(|toml| toml.get("v").cloned()) {
[INFO] [stdout] 107 | |             Some(toml::Value::String(version)) => {
[INFO] [stdout] 108 | |                 Ok(MetadataMigration::ReplaceMetadata(TestLayerMetadata {
[INFO] [stdout] ...   |
[INFO] [stdout] 114 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::MetadataMigration<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 | /         match metadata.clone().and_then(|toml| toml.get("v").cloned()) {
[INFO] [stdout] 107 | |             Some(toml::Value::String(version)) => {
[INFO] [stdout] 108 | |                 Ok(MetadataMigration::ReplaceMetadata(TestLayerMetadata {
[INFO] [stdout] 109 | |                     version,
[INFO] [stdout] ...   |
[INFO] [stdout] 112 | |             _ => Ok(MetadataMigration::RecreateLayer),
[INFO] [stdout] 113 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::MetadataMigration<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:107:51
[INFO] [stdout]     |
[INFO] [stdout] 107 |               Some(toml::Value::String(version)) => {
[INFO] [stdout]     |  ___________________________________________________^
[INFO] [stdout] 108 | |                 Ok(MetadataMigration::ReplaceMetadata(TestLayerMetadata {
[INFO] [stdout] 109 | |                     version,
[INFO] [stdout] 110 | |                 }))
[INFO] [stdout] 111 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::MetadataMigration<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:108:17
[INFO] [stdout]     |
[INFO] [stdout] 108 | /                 Ok(MetadataMigration::ReplaceMetadata(TestLayerMetadata {
[INFO] [stdout] 109 | |                     version,
[INFO] [stdout] 110 | |                 }))
[INFO] [stdout]     | |___________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::MetadataMigration<trait_api::tests::TestLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:112:18
[INFO] [stdout]     |
[INFO] [stdout] 112 |             _ => Ok(MetadataMigration::RecreateLayer),
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<SimpleLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:753:89
[INFO] [stdout]     |
[INFO] [stdout] 753 |           ) -> Result<LayerResult<Self::Metadata>, <Self::Buildpack as Buildpack>::Error> {
[INFO] [stdout]     |  _________________________________________________________________________________________^
[INFO] [stdout] 754 | |             LayerResultBuilder::new(SimpleLayerMetadata {
[INFO] [stdout] 755 | |                 field_one: String::from("value one"),
[INFO] [stdout] 756 | |                 field_two: 2,
[INFO] [stdout] 757 | |             })
[INFO] [stdout] 758 | |             .build()
[INFO] [stdout] 759 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<SimpleLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:754:13
[INFO] [stdout]     |
[INFO] [stdout] 754 | /             LayerResultBuilder::new(SimpleLayerMetadata {
[INFO] [stdout] 755 | |                 field_one: String::from("value one"),
[INFO] [stdout] 756 | |                 field_two: 2,
[INFO] [stdout] 757 | |             })
[INFO] [stdout] 758 | |             .build()
[INFO] [stdout]     | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::MetadataMigration<SimpleLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:795:11
[INFO] [stdout]     |
[INFO] [stdout] 795 |     match simple_layer.migrate_incompatible_metadata(&context, &GenericMetadata::default()) {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::ExistingLayerStrategy, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:804:9
[INFO] [stdout]     |
[INFO] [stdout] 804 | /         simple_layer
[INFO] [stdout] 805 | |             .existing_layer_strategy(&context, &layer_data)
[INFO] [stdout]     | |___________________________________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<SimpleLayerMetadata>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:812:25
[INFO] [stdout]     |
[INFO] [stdout] 812 |     let update_result = simple_layer.update(&context, &layer_data).unwrap();
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<std::option::Option<toml::map::Map<std::string::String, toml::Value>>>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:842:89
[INFO] [stdout]     |
[INFO] [stdout] 842 |           ) -> Result<LayerResult<Self::Metadata>, <Self::Buildpack as Buildpack>::Error> {
[INFO] [stdout]     |  _________________________________________________________________________________________^
[INFO] [stdout] 843 | |             LayerResultBuilder::new(GenericMetadata::default())
[INFO] [stdout] 844 | |                 .env(self.expected_layer_env.clone())
[INFO] [stdout] 845 | |                 .build()
[INFO] [stdout] 846 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<std::option::Option<toml::map::Map<std::string::String, toml::Value>>>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:843:13
[INFO] [stdout]     |
[INFO] [stdout] 843 | /             LayerResultBuilder::new(GenericMetadata::default())
[INFO] [stdout] 844 | |                 .env(self.expected_layer_env.clone())
[INFO] [stdout] 845 | |                 .build()
[INFO] [stdout]     | |________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::ExistingLayerStrategy, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:852:83
[INFO] [stdout]     |
[INFO] [stdout] 852 |           ) -> Result<ExistingLayerStrategy, <Self::Buildpack as Buildpack>::Error> {
[INFO] [stdout]     |  ___________________________________________________________________________________^
[INFO] [stdout] 853 | |             assert_eq!(&layer_data.env, &self.expected_layer_env);
[INFO] [stdout] 854 | |
[INFO] [stdout] 855 | |             Ok(ExistingLayerStrategy::Update)
[INFO] [stdout] 856 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::ExistingLayerStrategy, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:855:13
[INFO] [stdout]     |
[INFO] [stdout] 855 |             Ok(ExistingLayerStrategy::Update)
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<std::option::Option<toml::map::Map<std::string::String, toml::Value>>>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:862:89
[INFO] [stdout]     |
[INFO] [stdout] 862 |           ) -> Result<LayerResult<Self::Metadata>, <Self::Buildpack as Buildpack>::Error> {
[INFO] [stdout]     |  _________________________________________________________________________________________^
[INFO] [stdout] 863 | |             assert_eq!(&layer_data.env, &self.expected_layer_env);
[INFO] [stdout] 864 | |
[INFO] [stdout] 865 | |             LayerResultBuilder::new(GenericMetadata::default()).build()
[INFO] [stdout] 866 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<trait_api::LayerResult<std::option::Option<toml::map::Map<std::string::String, toml::Value>>>, TestBuildpackError>
[INFO] [stdout]    --> libcnb/src/layer/trait_api/tests.rs:865:13
[INFO] [stdout]     |
[INFO] [stdout] 865 |             LayerResultBuilder::new(GenericMetadata::default()).build()
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libcnb` (lib test) due to 22 previous errors
[INFO] running `Command { std: "docker" "inspect" "ee81d6180fd436d9a0d3a99fc8c003bec8dc801a1fff0979f80e2482183a5d86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee81d6180fd436d9a0d3a99fc8c003bec8dc801a1fff0979f80e2482183a5d86", kill_on_drop: false }`
[INFO] [stdout] ee81d6180fd436d9a0d3a99fc8c003bec8dc801a1fff0979f80e2482183a5d86
