1 error[E0599]: no method named `is_empty` found for struct `Foo` in the current scope
2 --> $DIR/method-suggestion-no-duplication.rs:7:15
5 | ---------- method `is_empty` not found for this struct
7 LL | foo(|s| s.is_empty());
8 | ^^^^^^^^ method not found in `Foo`
10 = help: items from traits can only be used if the trait is implemented and in scope
11 = note: the following trait defines an item `is_empty`, perhaps you need to implement it:
12 candidate #1: `ExactSizeIterator`
14 error: aborting due to previous error
16 For more information about this error, try `rustc --explain E0599`.