error: use of `unwrap_or` followed by a function call --> $DIR/unwrap_or.rs:4:46 | 4 | let s = Some(String::from("test string")).unwrap_or("Fail".to_string()).len(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `.unwrap_or_else(|| "Fail".to_string())` | = note: `-D or-fun-call` implied by `-D warnings` error: use of `unwrap_or` followed by a function call --> $DIR/unwrap_or.rs:8:46 | 8 | let s = Some(String::from("test string")) | ______________________________________________^ 9 | | .unwrap_or("Fail".to_string()) | |______________________________________^ help: try this: `.unwrap_or_else(|| "Fail".to_string())` error: aborting due to 2 previous errors