INFO] [stdout] error[E0495]: cannot infer an appropriate lifetime for lifetime parameter '_ in generic type due to conflicting requirements [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/assertor-0.0.1/src/assertions/map.rs:121:5 [INFO] [stdout] | [INFO] [stdout] 121 | fn key_set(&self) -> Subject<'a, Keys<K, V>, (), R> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: first, the lifetime cannot outlive the anonymous lifetime defined here... [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/assertor-0.0.1/src/assertions/map.rs:78:16 [INFO] [stdout] | [INFO] [stdout] 78 | fn key_set(&self) -> Subject<Keys<K, V>, (), R>; [INFO] [stdout] | ^^^^^ [INFO] [stdout] note: ...so that the method type is compatible with trait [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/assertor-0.0.1/src/assertions/map.rs:121:5 [INFO] [stdout] | [INFO] [stdout] 121 | fn key_set(&self) -> Subject<'a, Keys<K, V>, (), R> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] = note: expected `fn(&Subject<'_, _, _, _>) -> Subject<'_, std::collections::hash_map::Keys<'_, _, _>, _, _>` [INFO] [stdout] found `fn(&Subject<'_, _, _, _>) -> Subject<'a, std::collections::hash_map::Keys<'_, _, _>, _, _>` [INFO] [stdout] note: but, the lifetime must be valid for the lifetime `'a` as defined here... [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/assertor-0.0.1/src/assertions/map.rs:81:6 [INFO] [stdout] | [INFO] [stdout] 81 | impl<'a, K, V, R> MapAssertion<'a, K, V, R> for Subject<'a, HashMap<K, V>, (), R> [INFO] [stdout] | ^^ [INFO] [stdout] note: ...so that the type `std::collections::hash_map::Keys<'_, K, V>` will meet its required lifetime bounds... [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/assertor-0.0.1/src/assertions/map.rs:121:5 [INFO] [stdout] | [INFO] [stdout] 121 | fn key_set(&self) -> Subject<'a, Keys<K, V>, (), R> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] note: ...that is required by this bound [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/assertor-0.0.1/src/base.rs:111:14 [INFO] [stdout] | [INFO] [stdout] 111 | Borrowed(&'a S), [INFO] [stdout] | ^^^^^ [INFO] [stdout]