[INFO] fetching crate reductionml-core 0.1.0...
[INFO] building reductionml-core-0.1.0 against try#d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6 for pr-146237-1
[INFO] extracting crate reductionml-core 0.1.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate reductionml-core 0.1.0
[INFO] finished tweaking crates.io crate reductionml-core 0.1.0
[INFO] tweaked toml for crates.io crate reductionml-core 0.1.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate reductionml-core 0.1.0 on toolchain d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
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[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 85 packages to latest compatible versions
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[INFO] running `Command { std: "docker" "rm" "-f" "2b8991d60f172b46b2c67f02ed3a15ff6c80ae493d1df7688bc4dd34b80a6514", kill_on_drop: false }`
[INFO] [stdout] 2b8991d60f172b46b2c67f02ed3a15ff6c80ae493d1df7688bc4dd34b80a6514
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 02f6ad0aee8447a32b8045e6e095a43bd46ab15b84a4e2e92071dd47a553b4df
[INFO] running `Command { std: "docker" "start" "-a" "02f6ad0aee8447a32b8045e6e095a43bd46ab15b84a4e2e92071dd47a553b4df", kill_on_drop: false }`
[INFO] [stderr]    Compiling toml_datetime v0.6.11
[INFO] [stderr]    Compiling serde_json v1.0.145
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[INFO] [stderr]    Compiling serde v1.0.228
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[INFO] [stderr]    Compiling reductionml-core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]  --> src/reduction_registry.rs:1:34
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{BTreeMap, HashMap};
[INFO] [stdout]   |                                  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chunk`
[INFO] [stdout]   --> src/parsers/text_parser.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         chunk: &'a str,
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_chunk`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PredOutcome` is never constructed
[INFO] [stdout]    --> src/reductions/coin.rs:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 | struct PredOutcome(f32, f32);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sparse_namespaced_features.rs:92:17
[INFO] [stdout]    |
[INFO] [stdout] 92 |     pub fn iter(&self) -> NamespaceIterator {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 92 |     pub fn iter(&self) -> NamespaceIterator<'_> {
[INFO] [stdout]    |                                            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/sparse_namespaced_features.rs:264:23
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub fn namespaces(&self) -> NamespacesIterator {
[INFO] [stdout]     |                       ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub fn namespaces(&self) -> NamespacesIterator<'_> {
[INFO] [stdout]     |                                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/parsers/vw_text_parser.rs:284:32
[INFO] [stdout]     |
[INFO] [stdout] 284 | fn parse_namespace_info(input: &str) -> Result<(&str, (ParsedNamespaceInfo, f32))> {
[INFO] [stdout]     |                                ^^^^             ^^^^   ^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                |                |
[INFO] [stdout]     |                                |                the same lifetime is elided here
[INFO] [stdout]     |                                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 284 | fn parse_namespace_info(input: &str) -> Result<(&str, (ParsedNamespaceInfo<'_>, f32))> {
[INFO] [stdout]     |                                                                           ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/parsers/vw_text_parser.rs:301:24
[INFO] [stdout]     |
[INFO] [stdout] 301 |     namespace_segment: &str,
[INFO] [stdout]     |                        ^^^^ the lifetime is elided here
[INFO] [stdout] 302 | ) -> Result<(ParsedNamespaceInfo, Vec<ParsedFeature>)> {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^      ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |              |
[INFO] [stdout]     |              the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 302 | ) -> Result<(ParsedNamespaceInfo<'_>, Vec<ParsedFeature<'_>>)> {
[INFO] [stdout]     |                                 ++++                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.25s
[INFO] running `Command { std: "docker" "inspect" "02f6ad0aee8447a32b8045e6e095a43bd46ab15b84a4e2e92071dd47a553b4df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "02f6ad0aee8447a32b8045e6e095a43bd46ab15b84a4e2e92071dd47a553b4df", kill_on_drop: false }`
[INFO] [stdout] 02f6ad0aee8447a32b8045e6e095a43bd46ab15b84a4e2e92071dd47a553b4df
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7ac39338e6fc56c4803d56804d2e0b010c7931c237a867adb336b95cc67cf3e8
[INFO] running `Command { std: "docker" "start" "-a" "7ac39338e6fc56c4803d56804d2e0b010c7931c237a867adb336b95cc67cf3e8", kill_on_drop: false }`
[INFO] [stderr]    Compiling reductionml-core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]  --> src/reduction_registry.rs:1:34
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{BTreeMap, HashMap};
[INFO] [stdout]   |                                  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chunk`
[INFO] [stdout]   --> src/parsers/text_parser.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         chunk: &'a str,
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_chunk`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PredOutcome` is never constructed
[INFO] [stdout]    --> src/reductions/coin.rs:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 | struct PredOutcome(f32, f32);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sparse_namespaced_features.rs:92:17
[INFO] [stdout]    |
[INFO] [stdout] 92 |     pub fn iter(&self) -> NamespaceIterator {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 92 |     pub fn iter(&self) -> NamespaceIterator<'_> {
[INFO] [stdout]    |                                            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/sparse_namespaced_features.rs:264:23
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub fn namespaces(&self) -> NamespacesIterator {
[INFO] [stdout]     |                       ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub fn namespaces(&self) -> NamespacesIterator<'_> {
[INFO] [stdout]     |                                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/parsers/vw_text_parser.rs:284:32
[INFO] [stdout]     |
[INFO] [stdout] 284 | fn parse_namespace_info(input: &str) -> Result<(&str, (ParsedNamespaceInfo, f32))> {
[INFO] [stdout]     |                                ^^^^             ^^^^   ^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                |                |
[INFO] [stdout]     |                                |                the same lifetime is elided here
[INFO] [stdout]     |                                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 284 | fn parse_namespace_info(input: &str) -> Result<(&str, (ParsedNamespaceInfo<'_>, f32))> {
[INFO] [stdout]     |                                                                           ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/parsers/vw_text_parser.rs:301:24
[INFO] [stdout]     |
[INFO] [stdout] 301 |     namespace_segment: &str,
[INFO] [stdout]     |                        ^^^^ the lifetime is elided here
[INFO] [stdout] 302 | ) -> Result<(ParsedNamespaceInfo, Vec<ParsedFeature>)> {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^      ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |              |
[INFO] [stdout]     |              the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 302 | ) -> Result<(ParsedNamespaceInfo<'_>, Vec<ParsedFeature<'_>>)> {
[INFO] [stdout]     |                                 ++++                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `context`
[INFO] [stdout]    --> tests/cb.rs:297:15
[INFO] [stdout]     |
[INFO] [stdout] 297 |     fn chosen(context: &str, i: i32) -> (i32, f32) {
[INFO] [stdout]     |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_context`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> tests/cb.rs:300:39
[INFO] [stdout]     |
[INFO] [stdout] 300 |     fn r(context: &str, action: &str, i: i32) -> f32 {
[INFO] [stdout]     |                                       ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `context`
[INFO] [stdout]    --> tests/cb.rs:249:10
[INFO] [stdout]     |
[INFO] [stdout] 249 |     fn r(context: &str, action: &str, i: i32) -> f32 {
[INFO] [stdout]     |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_context`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> tests/cb.rs:249:39
[INFO] [stdout]     |
[INFO] [stdout] 249 |     fn r(context: &str, action: &str, i: i32) -> f32 {
[INFO] [stdout]     |                                       ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `context`
[INFO] [stdout]    --> tests/cb.rs:360:15
[INFO] [stdout]     |
[INFO] [stdout] 360 |     fn chosen(context: &str, i: i32) -> (i32, f32) {
[INFO] [stdout]     |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_context`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> tests/cb.rs:243:16
[INFO] [stdout]     |
[INFO] [stdout] 243 |     fn context(i: i32) -> String {
[INFO] [stdout]     |                ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `context`
[INFO] [stdout]    --> tests/cb.rs:246:15
[INFO] [stdout]     |
[INFO] [stdout] 246 |     fn chosen(context: &str, i: i32) -> (i32, f32) {
[INFO] [stdout]     |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_context`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> tests/cb.rs:197:9
[INFO] [stdout]     |
[INFO] [stdout] 197 |     for mut learner in learners.iter_mut() {
[INFO] [stdout]     |         ----^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]  --> src/reduction_registry.rs:1:34
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{BTreeMap, HashMap};
[INFO] [stdout]   |                                  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chunk`
[INFO] [stdout]   --> src/parsers/text_parser.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         chunk: &'a str,
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_chunk`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/parsers/vw_text_parser.rs:284:32
[INFO] [stdout]     |
[INFO] [stdout] 284 | fn parse_namespace_info(input: &str) -> Result<(&str, (ParsedNamespaceInfo, f32))> {
[INFO] [stdout]     |                                ^^^^             ^^^^   ^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                |                |
[INFO] [stdout]     |                                |                the same lifetime is elided here
[INFO] [stdout]     |                                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 284 | fn parse_namespace_info(input: &str) -> Result<(&str, (ParsedNamespaceInfo<'_>, f32))> {
[INFO] [stdout]     |                                                                           ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/parsers/vw_text_parser.rs:301:24
[INFO] [stdout]     |
[INFO] [stdout] 301 |     namespace_segment: &str,
[INFO] [stdout]     |                        ^^^^ the lifetime is elided here
[INFO] [stdout] 302 | ) -> Result<(ParsedNamespaceInfo, Vec<ParsedFeature>)> {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^      ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |              |
[INFO] [stdout]     |              the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 302 | ) -> Result<(ParsedNamespaceInfo<'_>, Vec<ParsedFeature<'_>>)> {
[INFO] [stdout]     |                                 ++++                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PredOutcome` is never constructed
[INFO] [stdout]    --> src/reductions/coin.rs:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 | struct PredOutcome(f32, f32);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/sparse_namespaced_features.rs:92:17
[INFO] [stdout]    |
[INFO] [stdout] 92 |     pub fn iter(&self) -> NamespaceIterator {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 92 |     pub fn iter(&self) -> NamespaceIterator<'_> {
[INFO] [stdout]    |                                            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/sparse_namespaced_features.rs:264:23
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub fn namespaces(&self) -> NamespacesIterator {
[INFO] [stdout]     |                       ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub fn namespaces(&self) -> NamespacesIterator<'_> {
[INFO] [stdout]     |                                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 5.56s
[INFO] running `Command { std: "docker" "inspect" "7ac39338e6fc56c4803d56804d2e0b010c7931c237a867adb336b95cc67cf3e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ac39338e6fc56c4803d56804d2e0b010c7931c237a867adb336b95cc67cf3e8", kill_on_drop: false }`
[INFO] [stdout] 7ac39338e6fc56c4803d56804d2e0b010c7931c237a867adb336b95cc67cf3e8
